水中常见离子对FeⅡ)/PS降解碘海醇及碘代消毒副产物生成影响研究
摘要：选取医学上常用的碘化X射线显影剂(ICM)的典型代表碘海醇(Iohexol),研究水中常见的7种无机阴离子(Cl-、Br-、I-、PO43-、HCO3-、SO42-、NO3-)在Fe2+/PS体系中对其降解的影响。然后考查其中三种卤离子(Cl-、Br-、I-)对Fe2+/PS预氧化后氯(胺)化顺序处理过程中碘代三卤甲烷(I-THMs)和常规DBPs生成的影响。结果表明：除Cl-外,其他6种阴离子(Br-、I-、PO43-、HCO3-、SO42-、NO3-)对碘海醇的降解都是抑制作用,且碘海醇的降解率随着它们各自浓度的增加而降低。相同浓度下,这6种离子抑制作用的大小依次为：PO43->HCO3->I->Br->SO42-≈NO3-。低浓度的Cl-(<10mM)会促进Fe2+/PS体系对碘海醇的降解,而高浓度的氯离子则会抑制其降解。当体系存在3种卤离子时,经Fe2+/PS体系预氧化后,氯化产生的DBPs浓度均高于氯胺化,而氯胺化产生的I-THMs浓度均高于氯化。I-THMs和DBPs浓度随着初始Cl-浓度的增加而先减少后增加,随着初始Br-和I-浓度的增加而增加。
关键词：FeⅡ)/PS阴离子碘海醇碘代消毒副产物
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[30] JI Y F,DONG C X,KONG D Y,et al.Heat-activated persulfate oxidation of atrazine:Implications for remediation of groundwater contaminated by herbicides[J].Chemical Engineering Journal,2015b,263:45-54．
[31] JI Y F,FAN Y,LIU K,et al.Thermol activated persulfate oxidation of antibiotic sulfamethoxazole and structurally related compounds[J].Water Research,2015a,87:1-9.
[2] WANG S Z,WANG J L.Trimethoprim degradation by Fenton and Fe(Ⅱ)-activated persulfate processes[J].Chemosphere,2018,191:97-105．
[3] YAO H,PEI J,WANG H,et al.Effect of Fe(Ⅱ/Ⅲ)on tetracycline degradation under UV/VUV irradiation[J].Chemical Engineering Journal,2017,308:193-201．
[4] WU S H,HE H J,LI X,et al.Insights into atrazine degradation by persulfate activation using composite of nanoscale zero-valent iron and graphene:Performances and mechanisms[J].Chemical Engineering Journal,2018,341:126-136．
[5] LIU Y,LANG J,WANG T,et al.Enhanced degradation of isoproturon in soil through persulfate activation by Fe-based layered double hydroxide:different reactive species comparing with activation by homogenous Fe(Ⅱ)[J].Environmental Science and Pollution Research International,2018,25(26):26394-26404．
[6] WAGNER E D,PLEWA M J.CHO cell cytotoxicity and genotoxicity analyses of disinfection by-products:An updated review[J].Journal of Environmental Sciences,2017,58:64-76．
[7] ZHU J P,LIN Y L,ZHANG T Y,et al.Modelling of iohexol degradation in a Fe(Ⅱ)-activated persulfate system[J].Chemical Engineering Journal,2019,367:86-93．
[8] WANG Z,LIN Y,XU B,et al.Degradation of iohexol by UV/chlorine process and formation of iodinated trihalomethanes during post-chlorination[J].Chemical Engineering Journal,2016,283:1090-1096．
[9] WANG J L,WANG S Z.Activation of persulfate(PS)and peroxymonosulfate(PMS)and application for the degradation of emerging contaminants[J].Chemical Engineering Journal,2017,334:1502-1517．
[10] HU J,CHU W H,SUI M,et al.Comparison of drinking water treatment processes combinations for the minimization of subsequent disinfection by-products formation during chlorination and chloramination[J].Chemical Engineering Journal,2018,335:352-361．
[11] ZOU J,MA J,CHEN L W,et al.Rapid Acceleration of Ferrous Iron/Peroxymonosulfate Oxidation of Organic Pollutants by Promoting Fe(Ⅲ)/Fe(Ⅱ)Cycle with Hydroxylamine[J].Environmental Science&Technology.2013,47 (20):11685-11691．
[12] DONG H Y,QIANG Z M,HU J,et al.Accelerated degradation of iopamidol in iron activated persulfate systems:Roles of complexing agents[J].Chemical Engineering Journal,2017,335:288-295．
[13] LIU H Z,BRUTON T A,DOYLE F M,et al.In situ chemical oxidation of contaminated groundwater by persulfate:decomposition by Fe(Ⅲ)-and Mn(Ⅳ)-containing oxides and aquifer materials[J].Environmental Science&Technology,2014,48:10330-10336．
[14] TIAN F X,XU B,LIN Y L,et al.Photodegradation kinetics of iopamidol by UV irradiation and enhanced formation of iodinated disinfection by-products in sequential oxidation processes[J].Water Research,2014,58(7):198-208．
[15] YE T,XU B,LIN Y L,et al.Formation of iodinated disinfection by-products during oxidation of iodide-containing waters with chlorine dioxide[J].Water Research,2015,47:3006-3014．
[16] LEI Y,ZHANG H,WANG J W,et al.Rapid and continuous oxidation of organic contaminants with ascorbic acid and a modifified ferric/persulfate system[J].Chemical Engineering Journal,2015,270:73-79．
[17] HAN D H,WAN J Q,MA Y W,et al.New insights into the role of organic chelating agents in Fe(Ⅱ)activated persulfate processes[J].Chemical Engineering Journal,2015,269:425-433．
[18] LI Y,ZHU T,ZHAO J C,et al.Interactive enhancements of ascorbic acid and iron in hydroxyl radical generation in quinone redox cycling[J].Environmental Science&Technology,2012,46:10302-10309．
[19] BU L J,ZHU S M,ZHOU S Q,et al.Degradation of atrazine by electrochemically activated persulfate using BDD anode:role of radicals and influencing factors[J].Chemosphere,2018,195:236-244．
[20] RAO Y F,QU L,YANG H S,et al.Degradation of carbamazepine by Fe(Ⅱ)-activated persulfate process[J].Journal of Hazardous Materials,2014,268:23-32．
[21] ZRINYI N,PHAM A L.Oxidation of benzoic acid by heatactivated persulfate:Effect of temperature on transformation pathway and product distribution[J].Water Research,2017,120:43-51．
[22] LUO C W,MA J,JIANG J,et al.Simulation and comparative study on the oxidation kinetics of atrazine by UV/H2O2,UV/HSO-5and UV/S2O2-8[J].Water Research,2015,80:99-108．
[23] JEONG C H,MACHEK E J,SHAKERI M,et al.The impact of iodinated X-ray contrast agents on formation and toxicity of disinfection by-products in drinking water[J].Journal of Environmental Sciences,2017,58:173-182．
[24] JIANG Y,GOODWILL J E,TOBIASON J E,et al.Comparison of ferrate and ozone pre-oxidation on disinfection byproduct formation from chlorination and chloramination[J].Water Research,2019,156:110-124．
[26] ZHU X,ZHANG X.Modeling the formation of TOCl,TOBr and TOI during chlor(am)ination of drinking water[J].Water Research,2016,96:166-176．
[27] WACAWEK S,LUTZE H V,GRBEL K,et al.Chemistry of persulfates in water and wastewater treatment:A review[J].Chemical Engineering Journal,2017,330:44-62．
[28] ZHANG T Y,XU B,HU C H,et al.A comparison of iodinated trihalomethane formation from chlorine,chlorine dioxide and potassium permanganate oxidation processes[J].Water Research,2015,68:394-403．
[29] PLEWA M J,WAGNER E D,METZ D H,et al.Differential toxicity of drinking water disinfected with combinations of ultraviolet radiation and chlorine[J].Environmental Science&Technology,2012,46:7811-7817．
[30] JI Y F,DONG C X,KONG D Y,et al.Heat-activated persulfate oxidation of atrazine:Implications for remediation of groundwater contaminated by herbicides[J].Chemical Engineering Journal,2015b,263:45-54．
[31] JI Y F,FAN Y,LIU K,et al.Thermol activated persulfate oxidation of antibiotic sulfamethoxazole and structurally related compounds[J].Water Research,2015a,87:1-9.
Effect of common ions on iohexol degradation and the formation of iodinated trihalomethanes in a Fe(Ⅱ)/PS system
Abstract: Iohexol,a commonly used iodinated X-ray contrast media in medical field,was selected to study the effect of seven common inorganic anions(Cl-,Br-,I-,PO43-,HCO3-,SO42-,NO3-)on its degradation in Fe2+/PS system.Then the effect of three halide ions(Cl-,Br-,I-)on the formation of iodinated trihalomethanes(I-THMs)and conventional DBPs during Fe2+/PS pre-oxidation and subsequent chlor(am)ination were studied.The results verified that except for Cl-,the other 6anions(Br-,I-,PO43-,HCO3-,SO42-,NO3-)all inhibited the degradation of iohexol.and the degradation rate of iohexol dicreased with the increased of these anions respectively.At the same concentration,the inhibitory effects of these six ions were:PO43->HCO3->I->Br->SO42-≈NO3-.Low concentration of Cl-(<10 mM)promoted the degradation of iohexol in Fe2+/PS system,while high Cl-concentration inhibited its degradation.When there were three halide ions in water,after Fe2+/PS pre-oxidation,the concentration of DBPs produced by chlorination was higher than that of chloramination,while the concentration of I-THMs produced by chloramination was higher than that of chlorination.The concentration of I-THMs and DBPs first decreased and then increased with the increased of the initial Cl-concentration,and increased with the increased of the initial Br-and I-concentration.When Cl-、Br-and I-existed in the system,the most I-THMs that produced by subsequent chlor(am)ination were CHCl2I,CHBr2I,and CHI3respectively,and the most DBPs that produced by subsequent chlor(am)ination were CF,BF,and CF respectively.
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