碳纳米管强化高铁酸盐降解苯扎贝特的效能与机理  

The efficiency and mechanism of carbon nanotube-enhanced bezafibrate degradation by ferrate

作　　者：黄先锟 田晨浩 郑志宏 刘超 HUANG Xiankun;TIAN Chenhao;ZHENG Zhihong;LIU Chao(School of Environmental and Municipal Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]华北水利水电大学环境与市政工程学院,郑州450046 [2]中国科学院生态环境研究中心,中国科学院饮用水科学与技术重点实验室,北京100085 [3]中国科学院大学,北京100049

出　　处：《环境工程学报》2024年第4期1144-1150,共7页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金青年项目(22206199);国家重点研发计划(2022YFC3203702);中国博士后科学基金面上项目(2022M723319)。

摘　　要：高铁酸盐具有较强的氧化性,是一种在水和废水处理中有较大应用潜力的绿色氧化剂,但对水中部分微污染物降解效果较差。本文研究了碳纳米管对高铁酸盐降解苯扎贝特的强化效果,探究了强化降解反应的途径,考察了水质因素对降解效果的影响,鉴定了强化降解的关键活性物种。结果表明,碳纳米管的表面羟基对强化高铁酸盐降解有促进作用,在碳纳米管存在且质量浓度为4 mg·L^(-1)时,苯扎贝特的去除率由2%升至69%。酸性条件有利于碳纳米管强化高铁酸盐降解苯扎贝特;当水pH由8.0降至6.0时,表观反应速率常数由89 L·(mol·s)^(-1)提升至415 L·(mol·s)^(-1)。碳纳米管可强化Fe(Ⅵ)向Fe(Ⅴ)的转化,并使Fe(Ⅴ)成为提高苯扎贝特强化降解效果的关键活性物种;常见阴离子对强化氧化有抑制作用,影响程度为PO_(4)^(3-)>SiO_(3)^(2-)>HCO_(3)^(-)>Cl^(-)>NO_(3)^(-)>SO_(4)^(2-)。Ferrate(Fe(Ⅵ))has a great application potential as a green oxidant in water and wastewater treatment due to its strong oxidation capacity,but it is less effective on degrade some recalcitrant organic micropollutants in water.In this study,the enhancement effect of carbon nanotubes(CNTs)on the degradation of bezafibrate(BZF)by Fe(Ⅵ)was investigated,the enhanced degradation reaction pathway was explored,the influence of water quality factors on the degradation effect was evaluated,and the key active species for enhanced degradation were identified.The results show that the surface hydroxyl groups on CNTs could promote the BZF degradation by Fe(Ⅵ).At CNTs concentration of 4 mg·L^(-1),the removal rate of BZF increased from 2%to 69%.Acidic conditions were conducive to CNTs-enhanced BZF degradation by Fe(Ⅵ);The apparent reaction rate constant increased from 89 L·(mol·s)^(-1) to 415 L·(mol·s)^(-1) when pH decreased from 8.0 to 6.0.CNTs could enhance the conversion of Fe(Ⅵ)to Fe(Ⅴ),Fe(Ⅴ)became a crucial substance to increase the degradation rate of BZF;Common anions had inhibitory effects on enhanced oxidation,the corresponding impact level was PO_(4)^(3-)>SiO_(3)^(2-)>HCO_(3)^(-)>Cl^(-)>NO_(3)^(-)>SO_(4)^(2-).

关 键 词：高铁酸盐 碳纳米管 苯扎贝特 强化氧化 动力学 

分 类 号：X703[环境科学与工程—环境工程]