In order to overcome the drawback of the low degree of separation from an aqueous solution of MnO_2, Fe_3 O_4-MnO_2 core-shell nanocomposites were used as heterogeneous Fenton-like catalysts for the removal of acid or...In order to overcome the drawback of the low degree of separation from an aqueous solution of MnO_2, Fe_3 O_4-MnO_2 core-shell nanocomposites were used as heterogeneous Fenton-like catalysts for the removal of acid orange 7. On the basis of the catalyst characterization, the catalytic ability of the as-synthesized nanocomposites was examined. The results showed that Fe304-Mn02 core-shell nanocomposites had greater catalytic ability than Fe_3 O_4 or MnO_2 used alone. Meanwhile, the catalyst dosage, H_2 O_2 dosage, temperature, and initial pH had significant effects on the removal of acid orange 7. A high degree of stability and reusability were exhibited by Fe_3 O_4-MnO_2 core-shell nanocomposites. Both HO· and HO_2· were generated in the reaction and HO· was the main radical for the removal of acid orange 7. A mechanism for H_2 O_2 catalytic decomposition using Fe_3 O_4-MnO_2 core-shell nanocomposites to produce HO·is proposed.展开更多
以苯甲醇为溶剂,采用水热法制备LaCoO_3钙钛矿型催化剂,研究LaCoO_3钙钛矿型催化剂非均相Fenton处理兰炭废水的最佳工艺条件及催化机理。结果表明,在过氧化氢用量3 m L、LaCoO_3钙钛矿型催化剂用量0.2 g、pH=4和反应温度25℃条件下,LaCo...以苯甲醇为溶剂,采用水热法制备LaCoO_3钙钛矿型催化剂,研究LaCoO_3钙钛矿型催化剂非均相Fenton处理兰炭废水的最佳工艺条件及催化机理。结果表明,在过氧化氢用量3 m L、LaCoO_3钙钛矿型催化剂用量0.2 g、pH=4和反应温度25℃条件下,LaCoO_3钙钛矿型催化剂非均相Fenton处理兰炭废水的COD去除率达到72.7%,通过自由基捕获剂叔丁醇的加入及一级动力学模型研究非均相Fenton过程机理。展开更多
基金supported by the National Natural Science Foundation of China(Grant No.51508564)
文摘In order to overcome the drawback of the low degree of separation from an aqueous solution of MnO_2, Fe_3 O_4-MnO_2 core-shell nanocomposites were used as heterogeneous Fenton-like catalysts for the removal of acid orange 7. On the basis of the catalyst characterization, the catalytic ability of the as-synthesized nanocomposites was examined. The results showed that Fe304-Mn02 core-shell nanocomposites had greater catalytic ability than Fe_3 O_4 or MnO_2 used alone. Meanwhile, the catalyst dosage, H_2 O_2 dosage, temperature, and initial pH had significant effects on the removal of acid orange 7. A high degree of stability and reusability were exhibited by Fe_3 O_4-MnO_2 core-shell nanocomposites. Both HO· and HO_2· were generated in the reaction and HO· was the main radical for the removal of acid orange 7. A mechanism for H_2 O_2 catalytic decomposition using Fe_3 O_4-MnO_2 core-shell nanocomposites to produce HO·is proposed.
文摘以苯甲醇为溶剂,采用水热法制备LaCoO_3钙钛矿型催化剂,研究LaCoO_3钙钛矿型催化剂非均相Fenton处理兰炭废水的最佳工艺条件及催化机理。结果表明,在过氧化氢用量3 m L、LaCoO_3钙钛矿型催化剂用量0.2 g、pH=4和反应温度25℃条件下,LaCoO_3钙钛矿型催化剂非均相Fenton处理兰炭废水的COD去除率达到72.7%,通过自由基捕获剂叔丁醇的加入及一级动力学模型研究非均相Fenton过程机理。
