Co-catalytic effect of sewage sludge-derived char as the support of Fenton-like catalyst

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• 作者：Yuting Tu^a ; Shuanghong Tian^a ; ^b ; Lingjun Kong^a ; Ya Xiong^a ; ^b ; ^{cesxya@mail.sysu.edu.cn}
• 关键词：Sewage sludge ; Inorganic component ; Co-catalytic effect ; Heterogeneous Fenton-like catalyst
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 出版时间：15 March, 2012
• 年：2012
• 卷：185-186
• 期：Complete
• 页码：44-51
• 全文大小：1066 K

文摘

Sewage sludge-derived char was successfully employed as the support of heterogeneous Fenton-like catalyst for the first time. Physicochemical properties of the prepared sewage sludge-derived char supported iron oxide catalyst (FeSC) have been evaluated by XRD, SEM, EDS and N₂-adsorption/desorption analysis. FeSC exhibited better performance in discoloration of AOII than wood sawdust-based carbon supported iron oxide catalyst (FeWC) both in batch experiment and continuous tests. The high inorganic components content of sewage sludge was concluded to have strong correlations with the high catalytic activity of FeSC. To further interpret the co-catalytic effect of inorganic components in sewage sludge, the inorganic components were removed from the sewage sludge and then a series of catalysts were prepared by the addition of iron, as well as silica and/or alumina to the sewage sludge free of the inorganic components. It was found that the removal of inorganic fraction remarkably decreased the catalytic activity of iron-containing catalyst. The insertion of SiO₂ favors the increase in catalytic activity due to the formation of both hydrogen bonds between H₂O₂ and siloxane bridges and the acidic microenvironment near the surface of silica phase. While the addition of Al₂O₃ in sewage sludge as basic sites can facilitate the degradation of H₂O₂, and the characteristic of Lewis acidity of alumina can accelerate the reduction of Fe³⁺ to Fe²⁺ by H₂O₂.