刘杨,郭洪光,李伟,张永丽.可见光下TiO2协同过硫酸盐光催化降解罗丹明[J].中南民族大学学报自然科学版,2019,38(1):34-38
可见光下TiO2协同过硫酸盐光催化降解罗丹明
Photocatalytic Degradation of Rhodamine B by Persulfate-assisted TiO2 under Visible-light Irradiation
  
DOI:10.12130/znmdzk.20190106
中文关键词: TiO2协同  可见光催化  过硫酸盐  罗丹明B  动力学
英文关键词: TiO2 synergistic  visible light photocatalysis  persulfate  Rhodamine B  kinetics
基金项目:国家自然科学基金资助项目(51508354) ;成都市科技局科技惠民技术研发项目(2015-HM01-00502-SF)
作者单位
刘杨,郭洪光,李伟,张永丽* 四川大学 建筑与环境学院成都 610065 
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中文摘要:
      应用过硫酸盐(PS)协同TiO2 在可见光下光催化/降解了废水中残留的典型稳定阳离子碱性染料罗丹明(RhB),考察了PS和TiO2投加量、pH、黄腐酸浓度对RhB降解的影响,并通过自由基抑制剂实验,验证了体系中主要的自由性基团种类.结果表明:投加固定量的PS,能够有效提高RhB的降解速率;当PS与TiO2 的投放量分别为1.0 mmol/L与0.5 g/L时,去除效率最高;溶液初始pH对RhB的降解影响较小,而水中存在的黄腐酸对于RhB降解具有明显的抑制作用;反应120 min后,体系中TOC的去除率最高为58%.探针实验表明:硫酸根自由基(SO4?-)以及超氧自由基( O2?-)为可见光/TiO2/PS体系中的主要活性物质;且催化剂在5次循环利用后,RhB去除率仍保持在95%以上.
英文摘要:
      Persulfate (PS) was used in synergy with TiO2 for the visible light induced photocatalytic degradation of Rhodamine B, which is a typical stable cationic basic dye residual in wastewater. The effect of PS concentration, TiO2 dosage, pH, and the concentration of fulvic acid (FA) on the degradation of RhB were studied. Moreover, the main free radical species in this system were identified by radical scavenger experiment. The results showed that the degradation rate was markedly improved by adding a certain amount of PS. The highest efficiency could be obtained with the dosage of PS and TiO2 of 1.0 mmol/L and 0.5 g/L, respectively. In addition, the initial pH of the solution had only slight effect on RhB degradation, but the presence of FA inhibited the degradation appreciably. The highest removal rate of TOC in this system was 58% after 120 min. of reaction. The radical scavenger experiment results demonstrated that sulfate radical (SO4?- ) and superoxide free radicals (O2?-) were the main active species in the visible-light/TiO2/PS system. The degradation efficiency of RhB remained above 95% after the catalyst being recycled for five times.
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