周期换向电化学/过硫酸盐去除水中橙黄G  

Removal of Orange G in Water by Periodically Reversing Electro-chemical/Peroxysulfate System

作　　者：孙兆楠[1] 潘玉瑾 冷杰雯 张健熙 时珂 杨薇[1] SUN Zhaonan;PAN Yujin;LENG Jiewen;ZHANG Jianxi;SHI Ke;YANG Wei(Liaoning Key Lab of Chemical Additive Synthesis and Separation,Yingkou Institute of Technology,Yingkou 115014,China;Key Lab of Pollution Ecology and Environmental Engineering,Shenyang Institute of Applied Ecology,China Academy of Sciences,Shenyang 110016,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]营口理工学院,辽宁省化学助剂合成与分离重点实验室,辽宁营口115014 [2]中国科学院沈阳应用生态所,污染生态与环境工程重点实验室,辽宁沈阳110016 [3]中国科学院大学,北京100049

出　　处：《环境科学与技术》2025年第3期220-228,共9页Environmental Science & Technology

基　　金：城市水资源与水环境国家重点实验室开放基金(HC202152);辽宁省化学助剂合成与分离重点实验室资助项目(ZJNK2409)。

摘　　要：染料废水处理的过程中面临的主要难题在于其高有机物含量、多变的组分构成以及较差的可生化性,处理不当会对生态环境和人类健康产生很大风险。电化学处理法和高级氧化法因其操作简便、副产物少且环保的特性而备受瞩目,并广泛应用于染料废水的处理实践中。该研究开展了周期换向电化学和过硫酸盐(PDS)活化过程相结合,通过产生自由基降解橙黄G(OG)的效能研究,以OG的去除率和反应速率常数k作为考核指标,对工艺条件进行了优化。结果表明,铁-铁电极组合优于铁-铝、铁-不锈钢,Na_(2)S_(2)O_(8)优于Na_(2)SO_(4)、K_(2)S_(2)O_(8),在反应电压为1 V、电解质投加量为2 mmol/L、换向周期为10 s、极板间距为1.0 cm、转速为400 r/min、初始pH值为5.4,并持续反应30 min的条件下,采用铁-铁电极组合,橙黄G的去除率达到了最佳效果,可达97%。淬灭实验显示,主要是由SO_(4)^(-)·等自由基与电化学自身的氧化还原共同作用降解OG,其中SO_(4)^(-)·的作用占据主导地位,同时周期换向的通电方式相较于直流有助于缓解极板钝化行为。该研究为周期换向电化学协同PDS高级氧化过程降解各种有机物提供了一定参考。In the process of dye wastewater treatment the main problem we often encounter is the high organic-matter con⁃tent,changeable composition,and poor bio-degradability of the wastewater,which will give rise to risks to both the eco-envi⁃ronment and human health if not to be handled properly.On the other hand,the electro-chemical treatment and advanced oxi⁃dation processes are highly regarded for their simplicity,minimal by-products,and environmental friendliness,making them widely applicable in dye wastewater treatment.This paper described a bench-scale experiment,in which the cyclic commuta⁃tion electro-chemistry was combined with the activation of peroxydisulfate(PDS)to generate free radicals degrading Orange G(OG),and the degradation process was optimized based on the removal rate of OG and the reaction rate constant(k)that was an assessment criteria to evaluate the effectiveness.The findings of the experiment presented that as to the electrode material,iron-iron electrode combination outperformed both iron-aluminium and iron-stainless steel combinations,and Na_(2)S_(2)O_(8) proved to be more effective than Na_(2)SO_(4) and K_(2)S_(2)O_(8).When using the iron-iron electrode combination,and under the optimal condition of reaction as voltage 1.0 V,Na_(2)S_(2)O_(8) dosage 2 mmol/L,reversing period 10 s,electrode spacing 1.0 cm,rotational speed 400 r/min,an initial pH 5.4,and sustained reaction time 30 min,the removal of OG attained up to 97%.Besides,the quenching test showed that OG degradation primarily occurred through free radicals such as sulfate radicals(SO_(4)^(-)·)and the inherent redox reactions of electrochemistry,with SO_(4)^(-)·playing a dominant role;meantime,compared to direct current(DC)method,the periodically reversing of energy mitigated the passivation behavior of the electrode plates.It is expected that the achievement of the study could offer valuable insights into the periodically reversing electro-chemical synergistic PDS advanced oxidation process for degrading organic compounds.

关 键 词：周期换向 电化学 过硫酸盐 染料废水 影响因素 

分 类 号：X703[环境科学与工程—环境工程]