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- Feng, Zhaoxuan, et al.
(författare)
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Microwave carbonized cellulose for trace pharmaceutical adsorption
- 2018
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Ingår i: Chemical Engineering Journal. - : Elsevier. - 1385-8947 .- 1873-3212. ; 346, s. 557-566
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Tidskriftsartikel (refereegranskat)abstract
- A promising sustainable strategy to valorize cellulose to high-value adsorbents for trace pharmaceuticals, like diclofenac sodium (DCF), in the water is demonstrated. Carbon nanospheres (CN) as the DCF adsorbent were derived from cellulose through a one-pot microwave-assisted hydrothermal carbonization method. CN exhibited efficient DCF removal (100% removal of 0.001 mg/mL DCF in 30 s and 59% removal of 0.01 mg/mL DCF in 1 h). The adsorption kinetics and isotherm data were well-fitted with the pseudo-second-order kinetic model and Langmuir model, respectively. The adsorption process was endothermic and spontaneous as confirmed by the thermodynamic parameters. Multiple characterization techniques including SEM/EDS, FTIR, FTIR-imaging and zeta potential were applied to qualitatively investigate the adsorption process. π-π stacking and hydrogen bonding were proposed as the dominant adsorption interactions. CN also demonstrated effective adsorption capacity towards three other commonly-detected contaminants in the wastewater including ketoprofen (KP), benzophenone (BZP), and diphenylamine (DPA), each bearing partial structural similarity with DCF. The affinity of the contaminants towards CN followed the order DPA > BZP > DCF > KP, which could be explained by the different configurations and chemical units. It was speculated that for DCF and KP, the steric hindrance and electrostatic repulsion produced by dissociated carboxyl groups can impede the adsorption process as compared to DPA and BZP. This methodology could offer further insights into the drug adsorption on the cellulose-derived carbon adsorbents and the use of bioderived carbons for treatment of wastewaters contaminated with pharmaceuticals.
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| 2. |
- Arndt, Anton, 1968-, et al.
(författare)
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Editorial
- 2021
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Ingår i: Footwear Science. - : Taylor & Francis. - 1942-4280 .- 1942-4299. ; 13:SUP1, s. S1-S3
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 6. |
- Stoor, Krister, 1959-
(författare)
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Svenska kyrkan och jojken
- 2016. - 1
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Ingår i: De historiska relationerna mellan Svenska kyrkan och samerna. - Skellefteå : Artos & Norma bokförlag. - 9789175807959 ; , s. 711-734
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Bokkapitel (refereegranskat)abstract
- Jojken är ett muntligt uttryck bland samer som funnits sedan urminnes tider. Att jojka var ett sätt att berätta och beskriva djur, människor, händelser, supranormala relationer etc. Eftersom jojken också användes som verktyg för nåjder eller personer med liknande kunskaper för att nå andra medium, blev jojken stämplad av kyrkan under 1600-talet som ett djävulens verk. Under lång tid var detta uttryckssätt förbjudet och straffbart. Men jojken försvann inte. Den levde sitt liv i det inofficiella rummet, långt borta ifrån den styrande eliten som oftast fanns vid kusten. Syndastämpeln som kyrkan så skickligt implanterat blev så småningom samernas egen syn på jojk på många håll. Trots det, när man studerar äldre inspelningar från början av 1910-talet och anteckningar från slutet av 1800-talet, ser man att många präster, särskilt i norra Västerbotten och södra Norrbotten varit mer än aktiva att dokumentera jojk. De har även blivit tillägnade egna melodier, det förnämsta man som jojkutövare någonsin kan skänka någon. Till och med bland læstadianska predikanter har det förekommit att man accepterat jojkning. "Jojkning är inte syndigt, blott man inte jojkar syndigt, liksom det ej heller är syndigt att dricka tvenne supar när det är kallt." Studien granskar jojkens roll hos den samiska befolkningen i relation till kyrkans folk, med fokus på 1900-talets utveckling.
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| 8. |
- Blanksvärd, Thomas
(författare)
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Strengthening of concrete structures by the use of mineral based composites
- 2007
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Strengthening of concrete structures with epoxy bonded carbon fiber reinforced polymers (CFRP) has been proved to be an excellent strengthening technique. However, using epoxy adhesives for bonding do contain some disadvantages such as diffusion closeness, thermal incompatibility to the base concrete, regulations regarding the working environment and minimum application temperature. Some of these drawbacks can be lessened by substituting the epoxy to a polymer reinforced mortar as the bonding agent. A new acronym for strengthening concrete structures with CFRP and polymer reinforced mortars is introduced, mineral based composites (MBC). This thesis presents experimental tests for both flexural strengthening and shear strengthening techniques using CFRP grids and polymer modified mortar as the bonding agent are presented. Flexural strengthening using the MBC system was designed as a pilot study to evaluate suitability of different mortars with different mechanical properties. The outcome of the pilot study on flexural strengthened small scale concrete beams gave indications on the choice of mortar used in the MBC system. A total amount of 21 concrete beams with and without shear strengthening subjected to four-point bending is evaluated in the thesis. The concrete beams were 4.5 m long and had a rectangular cross section of 180 x 500 mm. A number of parameters were varied for these beam specimens namely; concrete strength, shear reinforcement design, mortar properties, grid design and the addition of flexural strengthening using Near Surface Mounted Reinforcement (NSMR). Considering the steel shear reinforcement, three different variations were utilized; no shear reinforcement, a stirrup distance of 250 mm and 350 mm respectively. The results from the experimental study of the shear capacity using MBC on beams with no shear reinforcement indicates that strengthening concrete structures with the MBC system has competitive properties compared to epoxy bonded strengthening techniques. The MBC system reached 97% of the ultimate load achieved by a strengthening system with vertically applied epoxy bonded carbon fibre sheets. The ultimate failure load was increased with the increase of carbon fibre amount in the grid. Using a grid with small distance between the CFRP tows generated a higher first visible shear crack load. A simplified analytical design proposal to estimate the shear resistance contribution of the MBC strengthening system is proposed in the thesis. Reasonable results were obtained compared to experimental ultimate failure loads. Strains were monitored in the longitudinal steel reinforcement and the steel stirrups for the beams with internal steel shear reinforcement. Here it as clear that the use of the MBC strengthening system reduces the strains in the steel stirrups. Further, photmetric strain measurement on the surface of the strengthening system was also assessed. The use of the MBC strengthening system also reduces the prinicpal strain at the surface of the shear strengthening system. It can be concluded that the MBC strengthening system has great potentials to strengthen concrete structures. Further research are however needed in both development of the materials included
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| 10. |
- Epstein, Yaffa, et al.
(författare)
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EU Court to rule on banned pesticide use
- 2021
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Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 373:6552, s. 290-290
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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