钴负载型磁石墨烯耦合过氧单硫酸盐去除橙红7分析

发布时间：2018-01-07 11:16

本文关键词：钴负载型磁石墨烯耦合过氧单硫酸盐去除橙红7分析　出处：《工程科学与技术》2017年01期 　论文类型：期刊论文

【摘要】：为充分利用过渡金属对过氧单硫酸盐(PMS)的催化活性,同时解决残余金属所带来的水体二次污染问题,实现催化剂的重复利用,将磁性Fe3O4颗粒和Co负载在还原氧化石墨烯(RGO)表面合成新型多相复合磁性材料(CF-RGO),对比了PMS、RGO、CF-RGO、RGO/PMS、Co/PMS和CF-RGO/PMS等6种体系去除橙红7(AO7)的效果,并考察了不同初始p H、CF-RGO初始投量、AO7初始浓度对CF-RGO激活PMS去除水中AO7的影响。试验结果显示:PMS、RGO、CF-RGO和RGO/PMS体系基本不能去除水中AO7,而CF-RGO/PMS和Co/PMS体系则能有效去除AO7,且CF-RGO/PMS体系去除AO7的能力显著高于Co/PMS体系。对于CF-RGO/PMS体系,随着p H的增加,AO7的去除率先增大后减小,并在p H=5.0时达到最大去除率;CF-RGO初始投量对体系去除AO7的影响差异不大,总体呈正相关性;AO7初始浓度的不断增加会减弱体系的去除能力,从而降低AO7的去除率。同时,叔丁醇(TBA)和乙醇(ETOH)的投加证实了CF-RGO/PMS体系的自由基在p H=5.0时以硫酸自由基(·SO4-)为主,说明·SO4-对AO7的去除占主导作用。此外,重复使用该催化剂3次后发现其催化活性和稳定性均较好,Co、Fe等残留金属的检测结果也表明该催化剂对水体的二次污染极小。研究表明:CF-RGO作为催化剂可快速、高效地激活PMS去除水中AO7,且重复利用效果好、二次污染小;在p H=5.0,AO7、PMS初始浓度分别为0.03、0.2 mmol/L,CFRGO初始投量为0.003 g的条件下,CF-RGO/PMS体系去除AO7效果最佳,去除率最高达95.8%。
[Abstract]:In order to make full use of the catalytic activity of transition metal for PMSs, and to solve the problem of secondary water pollution caused by residual metal, the catalyst can be reused. A novel multiphase composite magnetic material, CF-RGOO, was synthesized on the surface of reduced graphene oxide (RGO) by magnetic Fe3O4 particles and Co loaded. The removal effects of six systems, RGO / PMSCoP / PMS and CF-RGO/PMS, on the removal of Orange Red 7 AO7) were studied, and the initial dosages of different initial pH CF-RGO were investigated. The effect of initial concentration of AO7 on the removal of AO7 from water by CF-RGO activated PMS. CF-RGO and RGO/PMS systems can not remove AO7 in water, while CF-RGO/PMS and Co/PMS systems can effectively remove AO7. The ability of CF-RGO/PMS system to remove AO7 was significantly higher than that of Co/PMS system. For CF-RGO/PMS system, with the increase of pH, the removal ability of AO7 was significantly higher than that of Co/PMS system. The removal rate of AO7 increased firstly and then decreased, and reached the maximum removal rate at pH 5.0. The effect of initial dosage of CF-RGO on the removal of AO7 in the system was not different, and the total positive correlation was found. The increasing of the initial concentration of AO7 will weaken the removal ability of the system, thus reducing the removal rate of AO7. The addition of tert-butanol (TBA) and ethanol (Etoh) confirmed that the main free radicals in CF-RGO/PMS system were sulfuric acid (路SO4) at pH 5.0. The results showed that the removal of AO7 was dominated by SO4-. In addition, the catalytic activity and stability of the catalyst were found to be good after repeated use of the catalyst for 3 times. The results of Fe and other residual metals also showed that the secondary pollution of the catalyst to the water was minimal. It was found that the PMS could be activated quickly and efficiently as the catalyst to remove AO7 from the water. And the reuse effect is good, the secondary pollution is small; The initial concentration of PMS was 0.03nmol / L 0. 003g / L CFRGO at the initial dose of 0. 003g / L ~ (-1) 路L ~ (-1) 路L ~ (-1) 路L ~ (-1) 路L ~ (-1) ~ (-1). CF-RGO/PMS system had the best effect on AO7 removal, and the highest removal rate was 95.8%.
【作者单位】：四川大学建筑与环境学院;中国市政工程西南设计研究总院;
【基金】：国家自然科学基金资助项目(51508354) 中国博士后基金资助项目(2016M590888) 成都市科技局项目资助项目(2015-HM01-00502-SF)
【分类号】：X791
【正文快照】： that the major radical formed was sulfate radical(·SO-4)at p H=5.0,which suggested a major role of·SO-4in degrading AO7.Inaddition,the catalytic activity and stability were good after using three times repeatedly.The investigation of residual Co and Fe

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