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RISS 인기검색어
- 검색키워드
- 저자 : Vijayanand S. Moholkar (검색결과 2 건)
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Sankar Chakma,Vijayanand S. Moholkar 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
In this study, ultrasound-assisted synthesis of bi-metallic oxides nanotubes (ZnO–TiO2 NTs) using sol–gel method followed by hydrothermal method is reported. Essentially, an attempt was made toinvestigate the simultaneous adsorption and sonocatalysis process for fast removal of dye using ZnO–TiO2 NTs. The results of characterization revealed that ZnO–TiO2 NTs were hollow nanotubular structurein shape with tube diameter of 10 nm and open ended. It has large specific surface area of 336.9 m2/g ascompared to ZnO (30.5 m2/g) and TiO2 (12.3 m2/g). The band-gap energy of NTs is 2.95 eV which is muchlower than the pure ZnO (3.18 eV) and TiO2 nanoparticles (3.15 eV). Activity of ZnO–TiO2 NTs wasassessed using decolorization process as model reaction system involving adsorption and sonocatalysisprocesses. The results were also compared with their counterparts, viz. ZnO and TiO2. Experimentalresults revealed that large specific surface area and surface charges on ZnO–TiO2 NTs promote theadsorption efficiency, while the high pore volume helps dye molecules to diffuse rapidly during thesonocatalysis process. Approximately, 97% of decolorization was achieved within 10 min of treatmentwith sonocatalysis process. These experimental results presented in this paper could form a useful toolfor further research in degradation of other bio-recalcitrant pollutants using ZnO–TiO2 NTs.
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Mechanistic analysis of sono-photolysis degradation of carmoisine
Sankar Chakma,Vijayanand S. Moholkar 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.33 No.-
The hybrid advanced oxidation process (AOP) of sono-photolysis, in which sonication and photolysis(UV-C/H2O2) are applied simultaneously, is known to give effective degradation of several biorecalcitrantpollutants. This study has attempted to identify the links and interactions between themechanisms of individual AOPs of sonolysis and photolysis, when applied simultaneously. Experimentalresults have been analyzed concurrently with the simulations of cavitation bubble dynamics. It isrevealed that oxidizing ( OH) radicals generated through photolysis contribute mostly to degradationreactions. Due to highly sporadic nature of transient cavitation, the contribution of sonolysis todegradation is rather subordinate as compared to photolysis. Nonetheless, faster degradation and highermineralization in sono-photolysis, as compared to photolysis alone, essentially points at supportive roleof ultrasound in the hybrid AOP. Addition of electrolytes (or salt) to the reaction mixture during sonophotolysistreatment causes effective partitioning of the pollutant molecules in the interfacial region oftransient cavitation bubble, which results in further enhancement of degradation kinetics andmineralization. Although the present study has employed Carmoisine as model pollutant, themechanistic principles identified in this study, and their manifestations in terms of degradation/mineralization of pollutants are applicable to any other bio-recalcitrant pollutant.
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