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RISS 인기검색어
- 검색키워드
- 저자 : Parag Ratnakar Gogate (검색결과 2 건)
- 무료
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Highly efficient bi-metallic bismuth-silver doped TiO2 photocatalyst for dye degradation
Nandana Chakinala,Parag Ratnakar Gogate,Anand Gupta Chakinala 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.12
Several mono-and bi-metallic photocatalysts with different loadings have been synthesized using ultrasound assisted sol gel and wet impregnation methods. Synthesized catalysts were characterized using various analytical techniques to determine the bandgap, functional groups, crystallinity, and surface morphology. Photocatalytic performance of the different catalysts was compared in terms of Rhodamine-B dye degradation, and further process optimization studies were carried out to achieve the maximum extent of degradation. Catalyst performance was studied both under UV and visible light irradiation for the degradation of different dyes. Compared to pure TiO2 and monometallic Ag or Bi doped on TiO2, bi-metallic Bi-Ag on TiO2 catalyst synthesized using wet impregnation was found to be highly active under the conditions investigated. Complete degradation (~100%) was obtained within shorter duration in the presence of minimal catalyst loading (60mg/L). Overall, this work has clearly demonstrated the higher catalytic activity of bi-metallic catalyst, which is attributed to the synergistic effect of Bi and Ag on TiO2 facilitating the efficient charge separation and improved e transfer combined with high ability to absorb in visible light region in effectively degrading organic pollutants.
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Microwave assisted persulfate induced degradation of sodium dodecyl benzene sulfonate
Pravin Sukharaj Bhandari,Parag Ratnakar Gogate 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.12
Microwave assisted persulfate induced degradation of sodium dodecyl benzene sulfonate (SDBS) was investigated, focusing on establishing the best conditions for maximum degradation. The study involving different persulfate based oxidants, such as potassium persulfate (KPS), ammonium persulfate (NH3PS) and sodium persulfate (NaPS), revealed that the extent of degradation as 98.3, 82.2 and 68.2% was obtained for the use of KPS, NH3PS and NaPS, respectively. The study of the effect of SDBS concentration (25-100mg/L), oxidant loading (0-3g/L) and power (140-350W) established that degradation decreased with an increase in the operating parameter beyond the optimum condition. Under optimized conditions using potassium persulfate (KPS) as an oxidant, 51.6% and 98.3% degradation of 50mg/L SDBS solution was obtained by conventional and microwave assisted chemical oxidation approach, respectively, under optimized conditions of power, oxidant loading, volume and time maintained as 280W, 2g/L, 250mL and 28min, respectively. Extending the conventional approach for 120min resulted in degradation of 92.5%, which establishes that microwave helps in reducing the treatment time significantly. Kinetic study revealed pseudo-first-order behavior for degradation of SDBS. Energy per order (EEO) for conventional and microwave assisted degradation was observed to be 840 and 317.33kWh/m3, respectively. Overall, microwave assisted persulfate induced degradation of SDBS has been established to be promising method giving rapid degradation and better economics.
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