NTA强化Fe(Ⅱ)/PMS体系降解橙黄G的效能与机制  

Efficiency and Mechanism of NTA Enhanced Fe(Ⅱ)/PMS System for Degradation of Orange G

作　　者：马红芳[1,2] 杨浩宇 陈思颖 陈秀峰[1] 许冬梅 董冬吟 邹景[1] 张建林 MA Hongfang;YANG Haoyu;CHEN Siying;CHEN Xiufeng;XU Dongmei;DONG Dongyin;ZOU Jing;ZHANG Jianlin(College of Civil Engineering,Huaqiao University,Xiamen 361021,China;College of Chemical Engineering,Huaqiao University,Xiamen 361021,China;Quanzhou Environmental Monitoring Center Station of Fujian,Quanzhou 362046,China;Weifang Municipal Engineering Design and Research Institute Limited Company of Shandong,Weifang 261061,China)

机构地区：[1]华侨大学土木工程学院,福建厦门361021 [2]华侨大学化工学院,福建厦门361021 [3]福建省泉州环境监测中心站,福建泉州362046 [4]山东省潍坊市市政工程设计研究院有限公司,山东潍坊261061

出　　处：《华侨大学学报（自然科学版）》2023年第2期222-232,共11页Journal of Huaqiao University(Natural Science)

基　　金：福建省厦门市青年创新基金资助项目(3502Z20206007);福建省泉州市科技计划项目(2022NS010)。

摘　　要：针对二价铁/过一硫酸盐(Fe(Ⅱ)/PMS)体系存在近中性pH条件下氧化效能低的问题,采用氨基三乙酸(NTA)强化Fe(Ⅱ)/PMS体系降解橙黄G(OG),研究NTA/Fe(Ⅱ)/PMS体系中OG降解的效能和机制,考察NTA,Fe(Ⅱ),PMS等反应物浓度和溶液pH值对OG降解效能的影响.实验结果表明:当pH=6.5时,NTA可显著强化Fe(Ⅱ)/PMS体系的氧化效能,OG的去除率从11.7%提高到92.5%,NTA的加入提高了溶液中有效活化剂的浓度,促进PMS分解生成活性物质;NTA/Fe(Ⅱ)/PMS体系中主导的活性物质为Fe(Ⅳ)和SO_(4)^(-)·,二者对体系氧化效能的贡献分别为72.0%和28.0%;增加NTA,Fe(Ⅱ)和PMS的浓度有助于OG的降解,但当三者浓度分别超过1.5,1.5,2.0 mmol·L^(-1)时,出现抑制现象;引入NTA既提高了Fe(Ⅱ)/PMS体系在近中性pH条件下的氧化能力,又拓宽了该体系的pH应用范围.Aiming at the problem that low oxidation efficiency of ferrous/peroxymonosulfate(Fe(Ⅱ)/PMS) system under near neutral pH condition, nitrilotriacetic acid(NTA) was applied to enhance the degradation of orange G(OG) in Fe(Ⅱ)/PMS system, and the efficiency and mechanism of the OG degradation, the effects of reagent concentrations such as NTA, Fe(Ⅱ), PMS and solution pH value on the degradation efficiency of OG were studied in NTA/Fe(Ⅱ)/PMS system. The experimental results showed that NTA could significantly enhance the oxidation efficiency of Fe(Ⅱ)/PMS system at pH 6.5,and the removal efficiency of OG increased from 11.7%to 92.5%.The addition of NTA increased the concentration of effective activator in the solution and thus promoted the decomposition of PMS to generate active substances.The dominant active substances in NTA/Fe(Ⅱ)/PMS system were Fe(Ⅳ)and SO_(4)^(-)·,which contributed 72.0% and 28.0% to the oxidation efficiency of the system respectively.Increasing the concentration of NTA,Fe(Ⅱ)and PMS could facilitate the degradation of OG,but negative effects were observed when NTA,Fe(Ⅱ),PMS concentration were over1.5,1.5,2.0mmol·L^(-1),respectively.The introduction of NTA not only improved the oxidation capacity of Fe(Ⅱ)/PMS system at near neutral pH,but also broadened the pH application range of the system.

关 键 词：氨基三乙酸 二价铁 过一硫酸盐 硫酸根自由基 橙黄G 

分 类 号：X703.1[环境科学与工程—环境工程]