PBC@δ-MnO_(2)活化过硫酸盐降解孔雀石绿:非自由基机制  

Removal of Malachite Green by PBC@δ-MnO_(2)Activated Persulfate:Non-Radical Mechanism

作　　者：郝慧茹 钟敏 夏志轩 仇玥 张倩[2] HAO Huiru;ZHONG Min;XIA Zhixuan;QIU Yue;ZHANG Qian(Schoolof Urban Construction,Wuchang Shouyi University,430064;School of Civil Engineering and Architecture,Wuhan University of Technology,430070;Wuhan Hanyang Municipal Construction Group Co.,Ltd,430050:Wuhan,China)

机构地区：[1]武昌首义学院城市建设学院,430064 [2]武汉理工大学土木工程与建筑学院,430070 [3]武汉市汉阳市政建设集团有限公司,湖北武汉430050

出　　处：《水处理技术》2024年第4期71-76,共6页Technology of Water Treatment

摘　　要：采用水热法制备了磷酸化黍糠基生物炭负载δ-MnO_(2)(PBC@δ-MnO_(2))纳米复合催化剂,利用SEM对催化剂进行表征,研究了其活化过二硫酸盐(PDS)降解孔雀石绿(MG)的效果及其去除机理。考察了初始pH、PDS浓度、PBC@δ-MnO_(2)投加量等反应条件对MG去除的影响。分析PBC@δ-MnO_(2)/PDS体系中的主要活性物质,推测该反应体系中可能的反应机制。结果表明,在PBC@δ-MnO_(2)/PDS体系中,随着初始pH、PDS浓度、PBC@δ-MnO_(2)投加量的升高,MG去除率也逐渐增大,当PBC@δ-MnO_(2)投加量为0.2 g/L,PDS浓度为0.5 mmol/L,初始pH为5时,MG的去除率可达到92.61%。自由基猝灭试验和EPR分析表明,单线态氧(^(1)O_(2))是PBC@δ-MnO_(2)/PDS体系中的主要活性物种,对MG的去除起主导作用。Phosphorylated millet based biochar supportedδ-MnO_(2)(PBC@δ-MnO_(2))nanocomposite catalyst was prepared by hydrothermal method.The catalyst was characterized by SEM.The degradation effect and removal mechanism of malachite green(MG)by activated persulfate(PDS)were studied.The effects of reaction conditions such as initial pH,PDS concentration,and PBC@δ-MnO_(2)dosage on MG removal were investigated.The main active species in the PBC@δ-MnO_(2)/PDS system were analyzed,and the possible reaction mechanism in the reaction system was speculated.The results showed that in the PBC@δ-MnO_(2)/PDS system,with the increase of initial pH,PDS concentration,and PBC@δ-MnO_(2)dosage,the MG removal rate also increased gradually.When the dosage was 0.2 g/L,the PDS concentration was 0.5 mmol/L,and the initial pH was 5,the removal rate of MG can reach 92.61%.Radical quenching experiments and EPR analysis showed that singlet oxygen(^(1)O_(2))was the main active species in the PBC@δ-MnO_(2)/PDS system and played a leading role in the removal of MG.

关 键 词：二氧化锰 过硫酸盐 孔雀石绿 非自由基 

分 类 号：O643.322[理学—物理化学]