水中亚硒酸盐的氧化效能研究:氧化剂、动力学与影响因素  

Oxidation efficiency of selenite in water:Oxidants,kinetics,and influencing factors

作　　者：吕金容 Ali Mashayekh-Salehi 蒋才芳 朱倩颖 梁钟月 张馨怡 韦富存 董慧峪 谢婷[1,2] 刘绍刚 LÜJinrong;Mashayekh-Salehi Ali;JIANG Caifang;ZHU Qianying;LIANG Zhongyue;ZHANG Xinyi;WEI Fucun;DONG Huiyu;XIE Ting;LIU Shaogang(Key Laboratory of Chemistry and Engineering of Forest Products,State Ethnic Affairs Commission,Guangxi Key Laboratory of Chemistry and Engineering of Forest Products,Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products,School of Chemistry and Chemical Engineering,Guangxi University for Nationalities,Nanning 530008;Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085;Guangxi Nanning Waterworks Co.,Ltd.,Nanning 530031)

机构地区：[1]广西民族大学化学化工学院,林产化学与工程国家民委重点实验室,广西林产化学与工程重点实验室,广西林产化学与工程协同创新中心,南宁530008 [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]广西绿城水务股份有限公司,南宁530031

出　　处：《环境科学学报》2024年第10期288-297,共10页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.21976040,22166008,21976040);广西重点研发计划项目(No.桂科AB24010135);广西青年创新人才科研专项(No.桂科AD21220003);广西高等学校高水平创新团队及卓越学者资助计划(No.桂教人[2020]6号);广西研究生教育创新计划项目(No.YCBZ2023114)。

摘　　要：硒元素的多种价态中,亚硒酸盐(Se(IV))毒性较高.本文对比研究了水中Se(IV)在自由氯(HOCl)、臭氧(O_(3))、高铁酸钾(Fe(VI))和高锰酸钾(Mn(VII))4种氧化剂作用下的氧化动力学以及其工艺因素(氧化剂投加量、pH值、天然有机物(NOM)、离子强度、共存离子)对其氧化效能的影响.结果表明,Se(IV)的氧化率随着氧化剂投加量增大而提升.在中性条件下,HOCl和Fe(VI)对Se(IV)氧化效果最好,氧化率分别为90.0%和70.0%,O_(3)和Mn(VII)分别在碱性和酸性条件下对Se(IV)具有最佳氧化效能.NOM可抑制4种氧化剂对Se(IV)的氧化,而离子强度促进了HOCl、Fe(VI)和Mn(VII)氧化.Br^(-)的存在促进了HOCl和O_(3)氧化Se(IV),而对Fe(VI)和Mn(VII)氧化无明显影响;SO_(4)^(2-)、NO_(3)-、Ca^(2+)、Mg^(2+)促进了O_(3)和Fe(VI)氧化Se(IV)但抑制Mn(VII)氧化,其中Ca^(2+)的抑制作用最大.此外,选取河流水、湖库水和地下水为水源水进行不同氧化剂对Se(IV)氧化效能的验证评价,研究结果可为含硒水体在氧化过程中的环境行为与毒性控制提供理论依据.Among the various oxidation states of selenium,selenite(Se(IV))exhibits the highest toxicity.This study compares the oxidation kinetics of selenite(Se(IV))by hypochlorous acid(HOCl),ozone(O_(3)),potassium ferrate(Fe(VI)),and potassium permanganate(Mn(VII)),and focuses on the effects of operational variables,including oxidant dosage,initial pH,natural organic matter(NOM),ionic strength,and coexisting ions on Se(IV)oxidation.The results reveal that increased oxidant dosage enhances Se(VI)formation.HOCl and Fe(VI)have maximum oxidation efficiency of about 90%and 70%for Se(IV),respectively in neutral conditions,whereas,optimal oxidizing capacities for O_(3) and Mn(VII)are found under alkaline and acidic conditions,respectively.The presence of NOM inhibits Se(IV)oxidation by each of the tested oxidants.Moreover,the oxidation efficiency of Se(IV)by HOCl,Fe(VI),and Mn(VII)was found to increase with increasing ionic strength.Among other factors,oxidation of Se(IV)by HOCl and O_(3) is promoted by Br^(-),but it has negligible influence on oxidation by Fe(VI)and Mn(VII).Moreover,the presence of Ca^(2+),Mg^(2+),SO_(4)^(2-),and NO_(3)-enhances the efficiency of Se(IV)oxidation by O_(3),HOCl and Fe(VI),but significantly inhibits oxidation by Mn(VII),with Ca^(2+)having the greatest effect.Furthermore,results from a river,lake,and ground water were obtained to evaluate the efficiency of the different oxidants in oxidizing Se(IV)under natural environmental conditions.Overall,these research findings provided a theoretical basis for understanding the environmental behavior of Se(IV)and for controlling the toxicity of selenium-containing water during oxidation process in water treatment.

关 键 词：饮用水处理 亚硒酸盐 氧化动力学 天然有机物 共存离子 

分 类 号：X131.2[环境科学与工程—环境科学]