水热法制备CuO活化过一硫酸盐降解罗丹明B机理探究  

Study on the Mechanism of Degradation of Rhodamine B by CuO Activated Peroxymonosulfate Prepared by Hydrothermal Method

作　　者：崔丰启 何争光[1] CUI Fengqi;HE Zhengguang(College of Ecology and Environment,Zhengzhou University,Zhengzhou 450000,China)

机构地区：[1]郑州大学生态与环境学院,河南郑州450000

出　　处：《水处理技术》2023年第11期37-41,48,共6页Technology of Water Treatment

基　　金：“十三五”国家科技重大专项水专项(2017ZX07602-001-002)。

摘　　要：罗丹明B作为一种致癌物质,亟需一种高效、清洁的处理技术。在常压下,采用水热法制备了CuO。建立了CuO/PMS体系降解罗丹明B(50 mg/L),总降解率可达99.75%,优于CuO体系和PMS体系。研究了CuO投加量、PMS投加量、初始pH以及阴离子对CuO/PMS体系的影响。结果显示,CuO为0.2 g/L,PMS为0.14 g/L,pH为7时降解效果最佳,CuO/PMS体系对于Cl^(-)、SO_(4)^(2-)、NO_(3)^(-)和HCO_(3)^(-)都具有良好的耐受性。采用SEM、XRD、XPS对CuO进行了表征,测试了CuO的性质。通过自由基捕获实验确定了CuO/PMS降解体系的活性物质主要是^(1)O_(2),还有少量SO_(4)^(·-)、·OH。推测CuO/PMS体系降解罗丹明B是以^(1)O_(2)为主导的非自由基途径为主,以·OH、SO_(4)^(·-)等自由基降解途径为辅。并通过HPLC色谱仪对降解后的溶液进行定性分析,确定了四种可能性最大的罗丹明B降解产物为C_(5)H_(10)O_(2)、C_(4)H_(4)O_(2)、P_(3)C_(3)H_(6)O_(2)和C_(2)H_(5)NO。As a carcinogenic substance,rhodamine B needs an efficient and clean treatment technology.CuO was prepared by hydrothermal method under atmospheric pressure.The CuO/PMS system was established to degrade rhodamine B(50 mg/L),and the total degradation rate was 99.75%,which was better than the CuO system and PMS system.The effects of CuO dosage,PMS dosage,initial pH and anions on the CuO/PMS system were studied.The results showed that CuO was 0.2 g/L,PMS was 0.14 g/L,and the degradation effect was the best at pH=7.The CuO/PMS system had good tolerance to Cl^(-),SO_(4)^(2-),NO_(3)^(-)and HCO_(3)^(-).The CuO was characterized by SEM,XRD,and XPS,and the properties of CuO were tested.Through the free radical capture experiment,it was determined that the active material of the CuO/PMS degradation system was mainly^(1)O_(2),and a small amount of∙OH,SO_(4)^(·-).It is speculated that the degradation of rhodamine B by the CuO/PMS system is dominated by^(1)O_(2)non-radical pathway,supplemented by∙OH,SO_(4)^(·-)and other free radical degradation pathways.The solution after degradation was qualitatively analyzed by HPLC chromatograph,and the four most likely degradation products of rhodamine B were C_(5)H_(10)O_(2),C_(4)H_(4)O_(2),P_(3)C_(3)H_(6)O_(2)and C_(2)H_(5)NO.

关 键 词：氧化铜 过一硫酸盐 罗丹明B 

分 类 号：O643.3[理学—物理化学] X703.1[理学—化学]