丁耀彬 夏凯 肖喻文.羟胺增强钴离子催化活化过一硫酸盐降解有机污染物[J].中南民族大学学报自然科学版,2020,39(1):1-6
羟胺增强钴离子催化活化过一硫酸盐降解有机污染物
Hydroxylamine enhanced cobalt catalytic activation of peroxymonosulfate for the degradation of organic pollutants
  
DOI:10.12130/znmdzk.20200101
中文关键词: 钴离子  过一硫酸盐  盐酸羟胺  催化降解
英文关键词: cobalt ions  peroxymonosulfate  hydroxylamine hydrochloride  catalytic degradation
基金项目:国家自然科学基金资助项目(21273089);中南民族大学人才引进资助项目(YZZ16005);中央高校基本科研业务费专项资金资助项目(CZP17004)
作者单位
丁耀彬 夏凯 肖喻文 中南民族大学 资源与环境学院武汉 430074 
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中文摘要:
      采用盐酸羟胺(HA)加快钴离子的循环,提高其催化活化过一硫酸盐(PMS)的效果,高效去除和矿化有机污染物.以罗丹明B(RhB)为模型污染物,考察了HA、Co2+、PMS浓度及溶液初始pH值对均相Co2+/PMS体系降解RhB的影响.同时,以乙二胺四乙酸(EDTA)为探针,测试了不同HA下体系中的Co3+的含量.结果表明:RhB的降解遵循准一级动力学过程,其降解速率随着Co2+和PMS浓度增加而线性增大.在投加2 μmol?L?1 Co2+和0.4 mmol?L?1 PMS下,HA浓度为0.4 mmol?L?1时,20 μmol?L?1 RhB可在10 min被完全降解.其一级降解速率常数为0.35 min?1,是不加HA时(0.16 min?1,Co2+/PMS体系)降解速率常数的2.2倍. HA的加入将TOC去除率由17.8%提高到了38.6%.HA的加入还有效促进了Co3+向Co2+的还原循环,增加了活性Co2+的含量,增强了其活化PMS产生自由基的能力.该HA增强Co2+/PMS体系也可有效降解其它有机染料(如亚甲基蓝、甲基紫、橙黄II).说明盐酸羟胺的加入增强了Co2+催化活化PMS降解有机染料.
英文摘要:
      Hydroxylamine hydrochloride (HA) was added to speed up the circulation of cobalt ions and promote the activation of PMS, and resulted in more efficient removal and mineralization of organic pollutants. The effects of the concentration of HA, Co2+ and PMS, and initial pH value of solution on the degradation of the model contaminant Rhodamine B (RhB) in the homogeneous Co2+/PMS system were investigated. Moreover, the content of Co3+ in different HA systems was measured by using EDTA as a probe. The results indicated the degradation of RhB followed a pseudo-first-order kinetic model, of which the degradation rate increased linearly with the increase of Co2+ and PMS concentrations. Under the conditions of 2 μmol?L?1 Co2+ and 0.4 mmol?L?1 PMS, RhB (20 μmol?L?1) could be degraded completely in 10 minutes when 0.4 mmol L?1 HA was added. The rate constant for the degradation of RhB in the HA enhanced system was 0.35 min?1, about 2.2 times that without HA (0.16 min?1, Co2+/PMS system). The TOC removal rate was improved from 17.8% to 38.6% due to the addition of HA. The addition of HA could also efficiently promote the reduction of Co3+ to Co2+, increase the content of active Co2+, and enhance its ability to activate PMS to produce free radicals. The HA enhanced Co2+/PMS system could effectively degrade other organic dyes (methylene blue, crystal violet, orange II, etc.). In conclusion, the addition of hydroxylamine hydrochloride enhances the degradation of organic dyes by catalytic activation of PMS with Co2+.
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