纳米CuO活化过二硫酸盐催化降解罗丹明B研究  

Research on Rhodamine B catalytic degradation using peroxydisulfate activated by nano CuO

作　　者：于华莉 高明睿 王连峰[1] 郭海燕[1] YU Huali;GAO Mingrui;WANG Lianfeng;GUO Haiyan(School of Environment and Chemical Engineering,Dalian Jiaotong University,Dalian 116028,China)

机构地区：[1]大连交通大学环境与化学工程学院,辽宁大连116028

出　　处：《大连理工大学学报》2025年第2期111-117,共7页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(42207288);大连市科技人才创新支持计划青年科技之星资助项目(2022RQ032)。

摘　　要：通过热解法制得4种不同结构的CuO颗粒,发现纳米CuO颗粒相比其他CuO颗粒在活化过二硫酸盐(PDS)降解罗丹明B(RhB)过程具有更高的催化活性,纳米CuO/PDS体系中催化降解RhB的准一级动力学常数(0.0451 min^(-1))分别是热解温度为300、450、600℃制备的CuO催化体系的2.5、2.8和12.5倍.提高纳米CuO和PDS的浓度,可促进RhB的降解;利于纳米CuO/PDS体系中降解RhB的pH条件为近中性.纳米CuO经过4次循环使用后对RhB的降解率仍高于90%,说明其具有较高的重复利用性.淬灭实验表明,纳米CuO活化PDS降解RhB过程中产生的主要活性氧物种是单线态氧(^(1)O_(2)).经估算,纳米CuO/PDS体系中产生的^(1)O_(2)浓度约为9.4×10^(-12)mol/L,且·O_(2)^(-)是产生^(1)O_(2)的中间产物.研究结果为开发CuO等金属氧化物活化PDS降解难降解有机污染物提供了新思路.Four CuO particles with different structures are prepared via pyrolysis method.Compared with other CuO particles,nano CuO particles exhibit eminent catalytic activity during the activation of peroxydisulfate(PDS)for Rhodamine B(RhB)degradation.The pseudo-first-order kinetic constant(0.0451 min-1)of RhB catalytic degradation in nano CuO/PDS system is 2.5,2.8 and 12.5 folds higher than those mediated by CuO catalytic system prepared at 300,450,600℃of pyrolysis temperature,respectively.Increasing nano CuO and PDS concentrations can promote the degradation of RhB,and the optimal pH for RhB degradation in nano CuO/PDS system is under neutral conditions.Nano CuO exhibits high reusability,which can maintain the degradation ratio of RhB higher than 90%after four cycles.The quenching experiment demonstrates that singlet oxygen(^(1)O_(2))is the main reactive oxygen species during the activation of PDS by nano CuO for RhB degradation.The ^(1)O_(2) concentration in nano CuO/PDS system is estimated to be about 9.4×10^(-12) mol/L,and ·O_(2)^(-) is considered as an intermediate product for ^(1)O_(2) production.The study results provide a new strategy for the design of metal oxides such as CuO as PDS activators to degrade refractory organic pollutants.

关 键 词：纳米CuO颗粒 过二硫酸盐 罗丹明B 单线态氧 

分 类 号：X703[环境科学与工程—环境工程]