| 1. |
- Li, S. -M, et al.
(författare)
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Simultaneous microwave-assisted synthesis, characterization, thermal stability, and antimicrobial activity of cellulose/AgCl nanocomposites
- 2012
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Ingår i: Biomass and Bioenergy. - : Elsevier BV. - 0961-9534 .- 1873-2909. ; 47, s. 516-521
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Tidskriftsartikel (refereegranskat)abstract
- By means of a simultaneous microwave-assisted method and a simple chemical reaction, cellulose/AgCl nanocomposites have been successfully synthesized using cellulose solution and AgNO3 in N,N-dimethylacetamide (DMAc) solvent. The cellulose solution was firstly prepared by the dissolution of the microcrystalline cellulose and lithium chloride (LiCl) in DMAc. DMAc acts as both a solvent and a microwave absorber. LiCl was used as the reactant to fabricate AgCl crystals. The effects of the heating time and heating temperature on the products were studied. This method is based on the simultaneous formation of AgCl nanoparticles and precipitation of the cellulose, leading to a homogeneous distribution of AgCl nanoparticles in the cellulose matrix. The experimental results confirmed the formation of cellulose/AgCl nanocomposites with high-purity, good thermal stability and antimicrobial activity. This rapid, green and environmentally friendly microwave-assisted method opens a new window to the high value-added applications of biomass.
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| 2. |
- Maswanna, Thanaporn, et al.
(författare)
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Enhanced hydrogen production by optimization of immobilized cells of the green alga Tetraspora sp CU2551 grown under anaerobic condition
- 2018
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Ingår i: Biomass and Bioenergy. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0961-9534 .- 1873-2909. ; 111, s. 88-95
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Tidskriftsartikel (refereegranskat)abstract
- The green alga Tetraspora sp. CU2551 has previously been identified and characterized as a photosynthetic microorganism with high potential for H-2 production. In the present study, cells of Tetraspora CU2551 were entrapped and immobilized in an alginate matrix with the aim to analyze the effect of cell stacking and a reduced exposure of O-2 to the cells. The results showed that the most favorable immobilization conditions were 4% (w/v) of final alginate concentration and a cell concentration of 0.125 mg cell dry wt/mL alginate with a bead diameter of 2.80-3.35 mm. The H-2 production yields increased when the immobilized cells were incubated in S-deprived medium and this could be repeated at least for 3 production times. Maximal total H-2 production reached 7.68 +/- 0.88 mL H-2/25 mL medium, corresponding to a rate of 1182.45 +/- 24.40 nmol H-2/h/mg DW. This production is about 6 times higher compared to by cells in suspension, 2-10 times higher when compared to by other green algae, and 10-50 times higher when comparing with cyanobacteria. Based on our observations, immobilized cells of Tetraspora CU2551 is considered a very promising biological system for significant photobiological H-2 production by a photosynthetic microorganism.
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| 3. |
- Ouhammou, Badr, et al.
(författare)
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Modeling of a bio-methane solar system driven by solar energy and heat pump
- 2022
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Ingår i: Biomass and Bioenergy. - : Elsevier. - 0961-9534 .- 1873-2909. ; 158
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Tidskriftsartikel (refereegranskat)abstract
- The paper presents a novel thermodynamic modeling approach of a pilot solar biomass system for bio-methane energy production and wastewater treatment by creation of two packages (STSB and MHPB) modeling platform under TRNsys studio software. Indeed, several newly developed mathematical schemes using the communicating elements: a new Multi-stage air to water Heat Pump, a new Vacuum Tube solar Collector (VTC), thermodynamic storage, and a biogas reactor) have been validated by experiment. The work presents and discusses two scenarios (packages), the first one –STSB- concerns the pilot solar-biomass system, and uses only renewable energy for the bio-methane production by anaerobic digestion mechanism under the mesophilic conditions (±35 °C to ±42 °C), The second scenario consists of a modeling Multi-stage Heat Pump Biomass reactor (MHPB). The packages developed have been tested for industrial case study. A validation process of two scenarios with experimental tests of a 500 L reactor -for the biomass of the cardboard paper-proves a good agreement, where the errors band is about 1% for STSB and 1.5% for the MHPB package. The biogas reactor treats about 900 (m³/year) liquid biomass (3 m³/day). The prediction results indicate that the biogas production attaint 51 (m³) per year. According to the biogas composition analysis, the bio-methane represents 74%, leading to prediction results of 38 (m³) per year of bio-methane for the case study. . Further, the extended results from the modeling packages platform indicate that for this installation type of 700 m³, the bio-methane (CH4) production is estimated of 52 836 (m³) per year, representing 64% of the total fuel consumption for the current case of cardboard recycling and packaging company.
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