摘要
采用电化学氧化(EC)耦合铁板(IP)感应电极激发过单硫酸盐(PMS)降解水中有机染料罗丹明B(RhB)。该体系中,以IP作为感应电极,Ti-IrO_(2)/RuO_(2)作为阳极,不锈钢板作为阴极,考察了不同体系(EC、PMS、EC/IP、EC/PMS及EC/IP/PMS)、电流、PMS投加量、溶液初始pH、无机阴离子(HCO_(3)^(-)、Cl^(-)、NO_(3)^(-)、H_(2)PO_(4)^(-))以及腐植酸对RhB降解的影响。结果表明:相比于其他体系,EC/IP/PMS体系能够有效地去除水中的RhB;RhB的降解率随着电流的增大而增加,PMS的最佳投加量为0.5 mmol/L,较低的溶液pH有利于RhB的降解;溶液中存在的HCO_(3)^(-)、NO_(3)^(-)、H_(2)PO_(4)^(-)以及腐植酸均对RhB降解有不同程度的抑制作用,而Cl^(-)对RhB降解有促进作用;通过加入不同的淬灭剂,确定了体系中主要存在的自由基;利用XPS对反应过程中产生的絮体进行了表征;此外,使用LC/TOF/MS识别出10种中间产物,并据此提出反应路径。
The degradation of rhodamine B(RhB)in water by peroxymonosulfate(PMS)excited by electrochemical oxidation(EC)coupled with iron plate(IP)induction electrode was studied.In this system,an IP was used as the induction electrode,Ti-IrO_(2)/RuO_(2) as the anode,and a stainless steel plate as the cathode.The effects of different systems(EC,PMS,EC/IP,EC/PMS and EC/IP/PMS),electrical current,PMS dosage,initial pH of solution,inorganic anions(HCO_(3)^(-),Cl^(-),NO_(3)^(-),H_(2)PO_(4)^(-))and humic acid(HA)on the degradation of RhB were investigated.Results showed that,compared with other systems,EC/IP/PMS could effectively remove RhB in water.The removal rate of RhB increased with the increase of electrical current.The optimum dosage for PMS was 0.5 mmol/L.Lower solution pH favored RhB degradation.HCO_(3)^(-),NO_(3)^(-),H_(2)PO_(4)^(-) and HA all inhibited RhB degradation to different extents,while Clpromoted RhB degradation.The major reactive radical species were ascertained by adding different radical scavengers.The flocs generated during the reaction had been characterized by XPS.In addition,ten intermediate products were identified by LC/TOF/MS,and reaction routes were proposed accordingly.
作者
高玉琼
宁寒
饶妍彦
周金强
高乃云
GAO Yuqiong;NING Han;RAO Yanyan;ZHOU Jinqiang;GAO Naiyun(School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai200093,China;College of Environmental Science and Engineering,Tongji University,Shanghai200092,China)
出处
《净水技术》
CAS
2022年第11期94-101,159,共9页
Water Purification Technology
基金
国家自然科学基金青年科学基金(51708348)
上海市科委重点项目(19DZ1208204)。
关键词
感应铁电极
过单硫酸盐
罗丹明
B
硫酸根自由基
降解机理
induction iron electrode
peroxymonosulfate(PMS)
rhodamine B(RhB)
sulfate radical
degradation mechanism
