羟胺-氨三乙酸强化Fe(Ⅲ)/H2O2体系降解橙黄G的研究
HYDROXYLAMINE-NITRILOTRIACETIC ACID ENHANCED Fe(Ⅲ)/H2O2 SYSTEM FOR DEGRADATION OF ORANGE G
王真然 1彭藴斓 1刘义青 1付永胜1
作者信息
- 1. 西南交通大学地球科学与环境工程学院,成都 611756
- 折叠
摘要
为改进传统芬顿法存在的pH应用范围窄、铁泥产量大的缺陷,构建了 Fe(Ⅲ)-氨三乙酸(NTA)/羟胺(HAm)/H2O2体系以降解偶氮染料橙黄G(OG).结果表明:Fe(Ⅲ)-NTA/HAm/H2O2体系可在中性条件下高效降解OG,降解率可达到90％以上,·OH是体系内降解OG的主要活性物种.OG在Fe(Ⅲ)-NTA/HAm/H2O2体系中的降解速率随着溶液pH的升高而降低,适当增加Fe(Ⅲ)、NTA、HAm、H2O2浓度有利于OG在该体系中的降解,但过量添加这些试剂会对OG的降解产生抑制作用.NTA的引入可将体系的pH应用范围从酸性拓展至弱碱性,而加入HAm可通过促进体系内Fe(Ⅱ)再生以大幅削减Fe的用量.与传统芬顿法相比,Fe(Ⅲ)-NTA/HAm/H2O2体系有效弥补了其存在的短板,具有较大的应用潜力.
Abstract
To improve the shortcomings of the traditional Fenton method,such as narrow pH application range and high iron mud production,the present study developed an Fe(Ⅲ)-nitrilotriacetic acid(NTA)/hydroxylamine(HAm)/H2O2 system for the degradation of azo dye Orange G(OG).Experimental results demonstrated that Fe(Ⅲ)-NTA/HAm/H2O2 system could effectively degrade OG under neutral condition with a degradation rate of 90％above,and OH was the dominant reactive species responsible for OG degradation in this system.The degradation rate of OG in the Fe(Ⅲ)-NTA/HAm/H2O2 system decreased with the increase of solution pH.Appropriate increases in Fe(Ⅲ),NTA,HAm,and H2O2 concentrations were beneficial for OG degradation in this system,but excessive addition of these reagents would inhibit OG degradation.The introduction of NTA could expand the pH application range of the traditional Fenton process from acidic to weakly alkaline,and the addition of HAm remarkedly reduced the dosage of Fe by promoting the regeneration of Fe(Ⅱ)in the system.Compared with the traditional Fenton process,this Fe(Ⅲ)-NTA/HAm/H2O2 system showed great potential for practical applications.
关键词
羟胺/氨三乙酸/芬顿法/高级氧化技术/橙黄GKey words
hydroxylamine/nitrilotriacetic acid/Fenton process/advanced oxidation technologies/Orange G引用本文复制引用
基金项目
四川省科技厅应用基础研究项目(2021YJ0385)
出版年
2024
NETL
NSTL
万方数据