| 1. |
- Benavente, Martha, et al.
(författare)
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Sorption of heavy metals from gold mining wastewater using chitosan
- 2011
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Ingår i: Journal of the Taiwan Institute of Chemical Engineers / Elsevier. - : Elsevier. - 1876-1070 .- 1876-1089. ; 42:6, s. 976-988
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Tidskriftsartikel (refereegranskat)abstract
- This study is concerned with the use of chitosan produced from shrimp shell waste for the removal of Cu(II), Hg(II), Pb(II) and Zn(II) from gold ore tailing solutions containing cyanide. This work involved the study of equilibrium and kinetic adsorption, the physicochemical characterization of mining effluents and desorption using different regenerating solutions. The experimental results showed that the adsorption capacity of chitosan is a function of the solution pH and that the optimum pH for these metallic ions is 6, except for Hg (pH 4). The equilibrium data were described using the Langmuir, Freundlich, Redlich-Peterson and SIPS isotherm models. The Langmuir equation was used to find the maximum adsorption capacity for Cu (79.94 mg/g), Hg (109.55 mg/g), Pb (58.71 mg)g) and Zn (47.15 mg/g). To determine the rate-controlling mechanism for metallic ion adsorption, pseudo-first-order, pseudo-second-order and the Elovich equation kinetic models were tested with experimental adsorption kinetic data. Tests conducted with gold ore tailing solutions indicated that chitosan is effective to remove these metallic ions above 70%. Desorption studies revealed that the regeneration of chitosan saturated with these metallic ions depends on the type and concentration of the regenerating solution ((NH(4))(2)SO(4), H(2)SO(4), HCl, NaOH and NaCl).
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| 2. |
- Daneshvar, Ehsan, et al.
(författare)
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Shrimp shell as an efficient bioadsorbent for Acid Blue 25 dye removal from aqueous solution
- 2014
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Ingår i: Journal of the Taiwan Institute of Chemical Engineers / Elsevier. - : Elsevier BV. - 1876-1070 .- 1876-1089. ; 45:6, s. 2926-2934
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Tidskriftsartikel (refereegranskat)abstract
- This study focused on kinetics, equilibrium and thermodynamics of Acid Blue 25 (AB25) dye biosorption from aqueous solution using the shell of Penaeus indicus shrimp as a biosorbent. Optimum sorption conditions were identified by varying solution pH, biomass dosage, initial dye concentration, contact time, salinity and ionic strength. Equilibrium data were well fitted by the Temkin, Freundlich and Langmuir isotherm models, while the pseudo-second order model best described kinetics. Thermodynamic data showed that AB25 dye biosorption onto shrimp shell was a feasible, spontaneous and exothermic one. The biosorption capacity increased with decreasing the sorbent particle size and with the addition of salts (NaCl, MgSO4, KNO3 and KH2PO4). The high sorption capacity of P. indicus shell obtained in this study suggests its use as an effective, low-cost biosorbent for the removal of acid dyes from wastewaters.
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| 3. |
- Gentili, Francesco
(författare)
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Investigation and Screening of Mixed Microalgae Species for Lipase Production and Recovery using Liquid Biphasic Flotation Approach
- 2023
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Ingår i: Journal of the Taiwan Institute of Chemical Engineers. - : Elsevier BV. - 1876-1070 .- 1876-1089. ; 142
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Tidskriftsartikel (refereegranskat)abstract
- Background: Lipase is mainly extracted from animals, plants, fungi, and bacteria. The difficulty in extracting lipase from these organisms has led to the discovery of sustainable sources producing lipase. This study is the first to document the existence of lipase in the microalgae species from Umea. Methods: Lipase in microalgae was extracted using liquid biphasic flotation as the protein homogenate from the extracts was found to contain lipase activity. The lipase activity was evaluated using colorimetric method with p- nitrophenyl palmitate as the substrate. The types, volumes, and concentrations of solvents as well as flotation kinetics, and the biomass weight were optimized. The experiment was conducted at optimal temperature and pH 7. Significant Findings: The optimized conditions for maximum lipase production were 400 mg of biomass, 10 min flotation time with flotation rate of 100 cc/min as well as 99.8% ethanol and 300 g/L ammonium sulphate concentration with volume ratio of 1: 0.83. Lipase recovery yield of the optimal LBF system was 70.3% with the separation efficiency of 82.0% and purification factor of 7.45. The findings revealed that the microalgae can be an ideal candidate for producing lipase and LBF serves as the platform for the development of large-scale extraction system.
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| 4. |
- Khan, Abdul Ahad, et al.
(författare)
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Algal biochar : A natural solution for the removal of Congo red dye from textile wastewater
- 2024
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Ingår i: Journal of the Taiwan Institute of Chemical Engineers / Elsevier. - : Elsevier. - 1876-1070 .- 1876-1089.
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Tidskriftsartikel (refereegranskat)abstract
- The present study was aimed at synthesizing algae-derived biochar to examine its effectiveness and adsorption capacity to remove Congo red dye. The independent variables such as dye concentration, adsorbent dose, and adsorption time were optimized by using a central composite design (CCD). An adsorption experiment was conducted to evaluate equilibrium using a detailed experimental design and characterized through XRD, TGA, SEM, EDX, and FTIR analysis. This paper also focuses on evaluating non-linear adsorption isotherm and kinetics to describe the adsorption mechanism along with applying an Artificial neural network to validate the removal efficiency. The maximum Congo red removal efficiency (96.14 %) and maximum adsorption capacity of algal biochar (186.94 mg/g) were achieved with the optimized parameters of 1 mg/L of dye concentration, 0.1 g of adsorbent dose, and 240 min of contact time. Adsorption behavior was well described by Langmuir isotherm and Pseudo-nth order. A multilayer perceptron (MLP) MLP 2–5–1 structure best validates the response. Overall, the study sheds light that Algal-derived biochar is a potential material for the elimination of Congo red dye and contributes to achieving sustainable development goals.
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| 5. |
- Koli, Rohit R., et al.
(författare)
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Gram bean extract-mediated synthesis of Fe3O4 nanoparticles for tuning the magneto-structural properties that influence the hyperthermia performance
- 2019
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Ingår i: Journal of the Taiwan Institute of Chemical Engineers / Elsevier. - : Elsevier BV. - 1876-1070 .- 1876-1089. ; 95, s. 357-368
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Tidskriftsartikel (refereegranskat)abstract
- A green synthesis of biocompatible magnetite (Fe3O4) nanoparticles (MNPs) using a combination of urea (U) and gram-bean extract (GBE, Cicer arietinum L.) is reported. The particle size of similar to 13 nm and highly stable magnetite phase is observed for GBE-U mediated MNPs. On the other hand, the MNPs synthesized using either U or GBE shows larger particle size and uneven size distribution. Interestingly, the sample with particle size similar to 13 nm shows optimum heat generation capacity (measured in specific absorption rate, i.e., SAR) near to the therapeutic temperature (43 degrees C) with least-variance. To investigate the influence of various factors such as variation in MNPs weight concentration (W-t), applied alternating magnetic field (AMF), saturation magnetization (M-s), magnetization rate (R-m), etc. on SAR, a multiple linear regression model (MLRM) is used. The study reveals a positive correlation of SAR with R-m, and AMF values while the negative correlation with M-s and W-t. Ultimately, the present green synthesis is the affordable approach for preparing stable and tiny MNPs. Moreover, MLRM is found to be a useful theoretical tool for understanding the influence of MNPs on hyperthermia performance.
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| 6. |
- Kousha, Masoud, et al.
(författare)
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Optimization of malachite green biosorption by green microalgae-Scenedesmus quadricauda and Chlorella vulgaris : Application of response surface methodology
- 2013
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Ingår i: Journal of the Taiwan Institute of Chemical Engineers / Elsevier. - : Elsevier BV. - 1876-1070 .- 1876-1089. ; 44:2, s. 291-294
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Tidskriftsartikel (refereegranskat)abstract
- The present study was carried out to optimize the various experimental conditions for biosorption of malachite green (MG) dye onto Scenedesmus quadricauda and Chlorella vulgaris biomass by applying response surface method (RSM). The effects of process parameters, viz. initial MG dye concentration (mg/L), initial solution pH, algae amount (mg/L) and contact time (mm) on the dye biosorption were analyzed using Box-Behnken design. The maximum experimental dye removal efficiency of 73.49 and 91.61% for S. quadricauda and C vulgaris, respectively, was obtained, which was in agreement with calculated values. The FT-IR analysis confirmed the presence of different functional groups on the surface of biosorbents which were responsible for sorption of MG dye. Kinetic studies revealed that experimental data fitted well with the pseudo-second order model. In addition, thermodynamic parameters for dye biosorption were calculated, and negative Delta G degrees values indicated spontaneous nature of biosorption. (C) 2012 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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| 7. |
- Leveneur, Sebastien, et al.
(författare)
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Interaction of thermal and kinetic parameters for a liquid-liquid reaction system : Application to vegetable oils epoxidation by peroxycarboxylic acid
- 2014
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Ingår i: Journal of the Taiwan Institute of Chemical Engineers / Elsevier. - : Elsevier BV. - 1876-1070 .- 1876-1089. ; 45:4, s. 1449-1458
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Tidskriftsartikel (refereegranskat)abstract
- A mathematical model was developed to analyze an exothermic liquid-liquid reaction system using epoxidation of oleic acid by peroxyformic acid formed in situ as an example. Kinetic and thermal parameters were included, mass transfer parameters were eliminated from the model and evaporation/condensation was taken into account. A calorimetric semi-batch reactor under isoperibolic mode was used in the experimental work. Different initial aqueous-phase concentrations of H2O2 [6.5-8.8 mol/l], water [44-45 mol/l], molar flow rate of formic acid [0.02-0.54 mol/min], initial reaction temperature [50-70 degrees C] and amount of organic phase [34-46 wt.%] were studied. A non-linear regression method was used to estimate kinetic (e.g., rate constant at average temperature and activation energy) and thermal parameters (e.g., reaction enthalpy) of the epoxidation and ring-opening reactions. The standard reaction enthalpy changes were estimated to be -116 kJ/mol for epoxidation reaction and -50 kJ/mol for the ring opening. (C) 2014 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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| 8. |
- Raheem, Aneeq, et al.
(författare)
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Experimental study on effects of geometric and hydrodynamicparameters on performance of multi-holed orifice flowmeters
- 2021
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Ingår i: Journal of the Taiwan Institute of Chemical Engineers / Elsevier. - : Elsevier. - 1876-1070 .- 1876-1089. ; 127, s. 17-22
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Tidskriftsartikel (refereegranskat)abstract
- Multi-holed Orifices (MOs) are widely used in swirling, cavitating and developing flows to reduce pressurelosses. This study focuses on analysis of MOs for developing turbulent flows. A large number of experimentswere performed, exploring the number of holes (n), Equivalent Diameter Ratio (EDR), compactness ratio (C),plate thickness ratio (s/d) and upstream developing length (L/D) in the Reynolds number (ReD) range of24,500-55,500. An empirical correlation of pressure loss coefficient and flow rate is formulated. It isobserved that pressure loss coefficient decays with the fourth power of EDR. A comparative study of theexperimental data with the literature is presented to ensure consistency and reliability.
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| 9. |
- Wang, Wei, et al.
(författare)
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An effective PtPdAuCuFe/C high-entropy-alloy applied to direct ethylene glycol fuel cells
- 2023
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Ingår i: Journal of the Taiwan Institute of Chemical Engineers / Elsevier. - : Elsevier BV. - 1876-1070 .- 1876-1089. ; 143
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Tidskriftsartikel (refereegranskat)abstract
- Background: As a promising green energy conversion device, direct ethylene glycol fuel cells (DEGFC) have been widely studied. But high-cost of their catalysts has severely limited large-scale commercial application. Developing economic and effective anodic electrocatalyst is an urgent work presently.Methods: Herein, an efficient high entropy alloy catalyst (HEA, penta-element) was prepared. Then, their catalytic performance and properties were authenticated by some electrochemical and physical methods. Importantly, it was also applied to a real DEGFC stack.Significant findings: Notably, the ethylene glycol oxidation current density (0.65 A mg−1PtPdAu) on as-prepared HEA is three times than that of commercial Pt/C (0.22 A mg−1Pt) with good long-term durability. Moreover, the HEA-equipped DEGFC obtains an open circuit potential of 0.58 V, which delivers 2 times larger peak power density (17.63 mW cm−2) than that of commercial Pt/C (7.37 mW cm−2). This work would be a good reference to developing other advanced HEA materials in electrocatalytic fields.
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| 10. |
- Hai, F.I., et al.
(författare)
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Pesticide removal by a mixed culture of bacteria and white-rot fungi
- 2012
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Ingår i: Journal of the Taiwan Institute of Chemical Engineers. - : Elsevier BV. - 1876-1070. ; 43:3, s. 459-462
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Tidskriftsartikel (refereegranskat)abstract
- Combining activated sludge cultures with microbes harboring specific degradation pathways could constitute a relevant process for the removal of toxic and recalcitrant organic substances from wastewater. Enhanced removal of three widely used recalcitrant pesticides from their liquid mixture was demonstrated by implementing a non-acclimated mixed culture of bacteria and white-rot fungus. During an incubation period of 14 days, the mixed fungus-bacteria culture achieved 47, 98, and 62% removal of aldicarb, atrazine and alachlor from the liquid phase, respectively. This compared favorably to batches containing only non-acclimated fungus or previously published removal rates with non-acclimated bacterial cultures. Biosorption along with biodegradation was responsible for the removal of the pesticides from the liquid phase. Potential application modes of the studied biodegradation process were also discussed.
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| 11. |
- Li, Jiujuan, et al.
(författare)
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Polymer-based Cu/Ag composite as seed layer on insulating substrate for copper addition of multi-dimensional conductive patterns
- 2021
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Ingår i: Journal of the Taiwan Institute of Chemical Engineers. - : Elsevier BV. - 1876-1070. ; 123, s. 254-260
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Tidskriftsartikel (refereegranskat)abstract
- Conductive polymer direct electroplating technology is one of the research hotspots in printed circuit board manufacturing. In this work, we designed a simple, efficient and environmental friendly chemical polymerization method to form a conductive polymer-based metal-mixed composite film where the polymer was polythiophene and the metals included copper and silver (PT-based Cu/Ag composite film). The work function of the PT-based Cu/Ag composite film decreased from 4.822 eV of pure PT to 4.638 eV, which serves as a seed layer to prepare conductive circuits by the additive process. The method without the metal etching and photolithography steps solves the problems of conventional subtractive processes for forming conductive patterns. Besides, the PT-based Cu/Ag composite film is able to increase the roughness of the substrate to improve the bonding force between the electroplated copper layer and the substrate. Moreover, due to the particularity of oxidation solution for preparing the PT-based Cu/Ag composite film, conductive lines and patterns can be selectively formed on insulating substrate with arbitrary shapes by the additive process.
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| 12. |
- Liu, Fang, et al.
(författare)
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Near-visible-light-driven noble metal-free of reduced graphene oxide nanosheets over CeO2 nanowires for hydrogen production
- 2020
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Ingår i: Journal of the Taiwan Institute of Chemical Engineers. - : Elsevier BV. - 1876-1070. ; 107, s. 139-151
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Tidskriftsartikel (refereegranskat)abstract
- This study is the first to use a newly-developed material via hydrothermal method, cerium oxide nanowires doped with reduced graphene oxide (CNW-RGO) for reductive H2 production. The detailed characteristics of the CNW-RGO materials were investigated to explore the capabilities of reductive production. The mean diameter of the CNWs was uniform at 22 nm. Owing to RGO-doping, the energy gap between the valence and conduction bands tended to become narrower that demonstrated by the density functional theory calculation (DFT). Furthermore, the optimum hydrogen production was 7.14 mmol g−1 by the CNW-RGO with a RGO content of 4 wt.% under the visible-light irradiation. This result was consistent with the turnover frequency (TOF) predictions. The introduction of RGO sheets effectively mediated the transfer of photogenerated electrons from the CNW to the sheets. Therefore, it could act as an electron trap to stimulate charge separation, which was corroborated by X-ray photoelectron spectroscopy (XPS) analysis. As indicated by comparative assessment, methanol was the most promising sacrificial agent in the system. Additionally, the formation of the methoxy group after the reaction was clearly demonstrated by Fourier-transform infrared (FTIR) spectroscopy. The number of hydroxyl groups on the alcohols directly determined their activity in reductive production.
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| 13. |
- Simoes Dos Reis, Glaydson
(författare)
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Preparation of hybrids of wood sawdust with 3-aminopropyl-triethoxysilane. Application as an adsorbent to remove Reactive Blue 4 dye from wastewater effluents
- 2021
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Ingår i: Journal of the Taiwan Institute of Chemical Engineers. - : Elsevier BV. - 1876-1070. ; 125, s. 141-152
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Tidskriftsartikel (refereegranskat)abstract
- Background: Biomass-based materials present low sorption capacity. In order to overcome this disadvantage, chemical modification of these materials is required.Methods: Hybrids of biomass-based materials were obtained by reacting (25%-200% weight) 3-aminopropyl-triethoxysilane (APTES) with the biomass Ayous wood sawdust (AW), obtaining the hybrid materials AW@APTES-0.25, AW@APTES-0.50, AW@APTES-1.0, AW@APTES-1.5, and AW@APTES-2.0, that were characterized by hydrophobic/hydrophilic balance, CHN elemental analysis, surface area, TGA, FTIR, and pH(pzc).Significant findings: For screening purposes, the five materials were tested as adsorbents to remove reactive blue 4 (RB-4) from water. The results showed that AW@APTES-0.5 attained the maximum removal of RB-4. The kinetics and equilibrium data were suitably fitted by the nonlinear General-order kinetic (GO) and Liu equilibrium adsorption models. The maximum amount adsorbed of RB-4 dye was 415.1 mg g(-1) using AW@APTES-0.5 (50 degrees C). An increase in the Q(max) value of AW@APTES-0.5 concerning unmodified AW attained up to 21.6 times. The Delta G degrees and Delta H degrees indicated that the adsorption processes of RB-4 onto adsorbents are endothermic and spontaneous, and the magnitude of enthalpy of adsorption (25.10 kJ mol(-1)) is compatible with the electrostatic attraction mechanism. The adsorbents' applicability for treating simulated dye effluents showed an excellent efficiency attaining 98.66% removal of the effluent. (C) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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| 14. |
- Wang, ZJ., et al.
(författare)
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Metabolic flux analysis of the central carbon metabolism of the industrial vitamin B-12 producing strain Pseudomonas denitrificans using C-13-labeled glucose
- 2012
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Ingår i: Journal of the Taiwan Institute of Chemical Engineers. - : Elsevier BV. - 1876-1070. ; 43:2, s. 181-187
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Tidskriftsartikel (refereegranskat)abstract
- The network topology and metabolic fluxes of central carbon metabolism in the industrial vitamin B-12 producing strain Pseudomonas denitrificans were characterized under oxygen limiting levels. Cultivations were carried out with 100% [1-C-13] or 20% [U-C-13] glucose as substrates under different oxygen supply conditions. The labeling patterns of the proteinogenic amino acids of exponentially growing cells were used to accurately estimate the fluxes in the central carbon metabolism of P. denitrificans. Metabolic flux analysis showed that glucose was mostly catabolized by the Entner-Doudoroff and pentose phosphate pathways. Up to 33% of glucose was consumed via the PP pathway under high specific oxygen uptake rate (SOUR) conditions. This amount was 77.9% higher than that under low oxygen uptake conditions. Quantitative evidence was also found for reversible serine hydroxymethyl transferase and threonine aldolase activities. Metabolic flux and cofactor analyses further showed that higher SOUR accelerated the supply of precursors and methyl groups. SOUR also provided more NADPH for higher vitamin B12 production under the same glucose consumption.
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| 15. |
- Yousefi-Lafouraki, Babak, et al.
(författare)
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The effect of short pin fin aspect ratio on thermal characteristics of intermittent impinging jet; An experimental and numerical study
- 2023
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Ingår i: Journal of the Taiwan Institute of Chemical Engineers. - 1876-1070. ; 148
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Tidskriftsartikel (refereegranskat)abstract
- Background: Pin fins are secondary surfaces extending from an object to enhance the heat transfer rate. Pin fin is one of the most effective practical techniques used in many industrial applications and thermal treatments especially for cooling electronic devices. Also, Pulsating flow is extremely used in the machinery industry and it can improve the heat transfer. Therefore, pulsating flow is combined with an extended surface to enhance the heat transfer efficiency. Methods: The current paper investigates numerically and experimentally the intermittent impingement flow and consequence heat transfer characteristics in the presence of a pin-fin array over a flat plate. The RNG k − ɛ model is employed to simulate unsteady three-dimensional turbulent flow using CFD software. The influences of jet Reynolds number, pulsation frequency, jet-to-surface distance, and aspect ratio on the distribution of the area-time averaged Nusselt number are studied. 36 elliptical pin-fins considered at three rows on the surface, placed at r/ D = 3, 5, and 7 (36, 60, and 84 mm) from the central point of the jet. Considering the influence of the aspect ratio on the streamline and temperature patterns of the flow, numerical simulations were conducted in various pin-fin diameters of 4–12 mm. Significant findings: From the experimental data, the results indicated that there is a specific frequency that the heat transfer increases for Reynolds numbers in the range of 10,000–20,000. The results illustrated that the rate of heat transfer is reduced with rising the diameter of the pin fin for AR>1, whereas it is enhanced for AR<1. The area-time averaged Nusselt number is enhanced with rising aspect ratio at various pin fin heights. For Re=10,000, the heat transfer rate decreases with increasing the jet-to-surface distance in steady state while it increases for pulsating flow. Also, the maximum value of turbulent kinetic energy appears nearby the pin-fin owing to the formation of a horseshoe vortex. The vortex structures are strengthened and grow downstream, as the frequency increases.
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| 16. |
- Zhu, Siyu, et al.
(författare)
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Variation of interception efficiency and transformation to natural glucocorticoids in three texture reclaimed water receiving riverbeds
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Ingår i: Journal of the Taiwan Institute of Chemical Engineers. - 1876-1070.
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Tidskriftsartikel (refereegranskat)abstract
- Background The efficacy of the interception and purification mechanism for low-dose toxic contaminants in riverbeds, which serve as a link between surface water and groundwater, is of paramount importance in ensuring groundwater safety, particularly considering the replenishment of reclaimed water. The specific objective of this work is to identify the variation of interception efficiency and transformation to natural glucocorticoids in three texture reclaimed water receiving riverbeds. Methods Herein, an experimental percolation platform was set up to simulate hydrocortisone (HC) migration and biotransformation during the reclaimed water infiltration process through three typical types of riverbeds (silty clay (SC), loam (L) and sand (S)). Significant findings The attenuation of HC in time dimension and longitudinal direction was consistent with the two compartment first-order kinetic model, with decay rate constant greater than -0.031 m−1 and 2.71 d−1 in spatial and temporal distribution. The SC riverbed enhanced 36.36 % HC removal due to adsorption and microbial transformation. Furthermore, the major metabolic pathways of side chain oxidation and ring rupture were significantly enhanced due to the increasing diversity and relative abundance of the functional bacteria present in SC. The enrichment of functional genera, Stenotrophomonas and Sphingomonas contributed to the biotransformation enhancement. pH and TOC played the most significant role to the difference of migration and metabolism of HC. Moreover, pore volume was the primary factor leading to varying adsorption of three types of riverbeds for HC. The simulation results with HYDRUS showed that the ecological risk level of HC in L and S were 6.5 times higher than SC after 50 years infiltration. Therefore, future challenges and prospects concerning pollution control and enhancement measures should be pay attention to the physicochemical characteristics of various riverbeds.
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