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Microwave electrodeless lamp assisted catalytic degradation of X-GRL with manganese dioxides: Adsorption and manganese(IV) reductive dissolution effects
Liu, Ruiping; Wang, Hongjie; Zhao, Xu; Xiao, Shuhu; Qu, Jiuhui
2008
Conference Name3rd China-Japan Workshop on Environmental Catalysis and Eco-Materials
Conference DateOCT 11-12, 2007
Conference PlaceBeijing, PEOPLES R CHINA
ISBN0920-5861
Department环境水质学国家重点实验室
AbstractThis study focuses on the adsorption and microwave assisted-oxidation of Cationic Blue (X-GRL) on hydrous manganese oxides (delta MnO(2)) and commercial MnO(2) (beta MnO(2)). The effects of X-GRL adsorption and Mn(IV) reductive dissolution are investigated. delta MnO(2) exhibits higher adsorbing potential for X-GRL than beta MnO(2) does, with dissolved organic carbon (DOC) removal potential (removed DOC at per gram MnO2) of 4.92 and 0.31 mg/g, respectively. The ratio of absorption at different wavelength (A(202) (nm)/A(300) (nm)/A(610) (nm)) and ratio of DOC to A(610) (nm) (R(DOC)/A(610) (nm)) varies after adsorption. This implies the electron transfer between manganese oxides surfaces and X-GRL, which is confirmed by dissolved Mn(II) concentration increase. delta MnO(2) exhibits more remarkable oxidizing effect than beta MnO(2) does. X-GRL adsorption onto delta MnO(2) involves in hydrogen bonding and electrostatic interactions, which is inhibited by Ca(2+) presence and favored at higher pH. Manganese species (delta MnO(2), beta MnO(2) and Mn(2+)) facilitates X-GRL degradation and DOC removal in O(2)/MWL systems, and more significant effects are observed for delta MnO(2) due to its combined effects of adsorption and catalysis. The k(app) (apparent reaction constant) in the initial 10 min with delta MnO(2) presence is about 2.5 and 4.2 times higher than that with beta MnO(2) and Mn(2+) presence, respectively. However, with reactions continuing, DOC mineralization is inhibited in heterogeneous systems due to the adverse effect of high dissolved Mn(2+) concentration. (C) 2008 Elsevier B.V. All rights reserved.
KeywordX-grl Delta Mno(2) Beta Mno(2) Adsorption Reductive Dissolution Catalysis Microwave Electrodeless Lamp
DOI10.1016/j.cattod.2008.08.035
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Document Type会议论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/24691
Collection环境水质学国家重点实验室
Recommended Citation
GB/T 7714
Liu, Ruiping,Wang, Hongjie,Zhao, Xu,et al. Microwave electrodeless lamp assisted catalytic degradation of X-GRL with manganese dioxides: Adsorption and manganese(IV) reductive dissolution effects[C],2008.
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