摘要
采用水热合成法制备出了具有较高催化活性的催化剂四氧化三铁(Fe_3O_4),并利用Fe_3O_4活化过硫酸盐降解活性黑5,考察了初始pH、Fe_3O_4投加量、活性黑5初始浓度和过硫酸盐投加量对活性黑5降解效果的影响。结果表明,Fe_3O_4活化过硫酸盐降解活性黑5的最佳条件为初始pH 6、活性黑5初始质量浓度50mg/L、过硫酸盐投加量6mmol/L、Fe_3O_4投加量2.0g/L。在最佳条件下,反应180min,活性黑5的降解率达到80.2%,Fe_3O_4反复使用5次后,活性黑5的降解率仍能达到77%以上。活性黑5的降解途径为:偶氮键打开产生苯环中间产物和萘环中间产物,萘环中间产物逐步转化为邻苯二甲酸酐→邻苯二甲酸→苯甲酸;苯环中间产物逐步转化为对氨基苯磺酸→硝基苯和对氨基苯酚,对氨基苯酚转化为对苯二酚;最终被彻底氧化降解成CO_2、H_2O等无毒小分子物质。活性黑5在降解过程中对植物的毒性先升高后降低。
The catalyst Fe 3O 4 with high catalytic activity was prepared by hydrothermal synthesis.C.I.reactive black 5 was degraded under different conditions of initial pH,Fe 3O 4 dosage,C.I.reactive black 5 initial concentrations and persulfate dosage.Results showed that the optimal conditions were initial pH of 6,C.I.reactive black 5 initial mass concentration of 50 mg/L,persulfate dosage of 6 mmol/L and Fe 3O 4 dosage of 2.0 g/L.Under the optimal conditions,the degradation rate of C.I.reactive black 5 was 80.2%after 180 min.After 5 times recycling of Fe 3O 4,the degradation rate of C.I.reactive black 5 was still above 77%.The degradation pathway was that C.I.reactive black 5 broke into intermediate products with benzene ring and naphthalene ring first.Then intermediate products with naphthalene ring transformed into phthalic anhydride→phthalic acid→benzoic acid.And intermediate products with benzene ring transformed into p-aminobenzene sulfonic acid→nitrobenzene and p-aminophenol,with p-aminophenol further into p-dihydroxybenzene.C.I.reactive black 5 was degraded in CO 2,H 2O and so on,ultimately.The phytotoxicity of the intermediate products increased first and decreased then with time.
作者
王艳
李春花
龚畏
周秀秀
戴金贵
WANG Yan;LI Chunhua;GONG Wei;ZHOU Xiuxiu;DAI Jingui(College of Resource and Environment,Anhui Science and Technology University,Chuzhou Anhui 233100)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2018年第8期860-865,共6页
Environmental Pollution & Control
基金
安徽省高校自然科学研究项目(No.KJ2016A178)
安徽省高校优秀中青年骨干人才国内外访学研修重点项目(No.gxfxZD2016179)
安徽科技学院自然科学研究项目(No.ZRC2016475)
安徽省大学生创新创业训练计划项目(No.201610879044)
安徽省自然科学基金资助项目(No.1808085MB49)