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Partial oxidation of polyvinyl alcohol using a commercially available DSA anode
Guo-Ting Liang,Weiyong Zhu,Xiaoqi Chai,Lingfeng Zhu,Xiwang Zhang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.31 No.-
The removal of polyvinyl alcohol (PVA) by electrochemical oxidation was investigated systematicallyunder various conditions using a commercial Dimensionally Stable Anodes anode. It was observed thathigher electrode potential led to more PVA degradation and gases evolution. Acidic conditions werebeneficial for PVA degradation. The higher degradation of PVA was achieved with KBr compared withother salts. The PVA degradation was slightly improved by ultraviolet irradiation while hydrogenperoxide lowered the degradation evidently. FTIR analysis indicated that PVA was partially oxidizedrather than completely mineralized. The iso-propanol quenching test indicated hydroxyl radicals weremainly responsible for PVA degradation.
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Guoting Li,Weiyong Zhu,Lingfeng Zhu,Xiaoqi Chai 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.7
Sugarcane bagasse was pyrolyzed under oxygen-limited conditions from 100 to 600 oC and used for the adsorptive removal of oxidation intermediate p-benzoquinone, tetracycline, and polyvinyl alcohol. The three organic pollutants have different polarities and solubilities. The carbon content increased from 57.7% of the raw bagasse to 75.3% of the biochar pyrolyzed at 600 oC, while the O content decreased from 13.2% to 6.1%. Accordingly, the biochar surface became more hydrophobic with increasing pyrolytic temperature. Interestingly, the adsorption affinity of biochars towards the three pollutants improved with an increase in the pyrolytic temperature. The adsorption of tetracycline molecules was almost unaffected by its being negatively charged with increasing solution pH. A mechanism of π- π electron-donor-acceptor interaction might contribute to the adsorption of tetracycline and p-benzoquinone, while Hbond interaction between polyvinyl alcohol and the biochar might be dominant during adsorption. The Elovich model fitted the kinetic model well, indicating that the diffusional rate-determining step was more pronounced. An isotherm study indicated that the contribution of partitioning was also dominant in the adsorption processes. Wide application of the prepared biochars is expected for the efficient adsorptive removal of organic pollutants.
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