CAJ | 학술논문

硫酸根自由基（SO4-·）是选择性小、氧化还原电位高的自由基，和羟基自由基（OH·）一样能够被运用于难降解有机污染物的去除．文中对热激活过硫酸钠产生SO4-·降解典型农药敌草隆进行了研究，通过实验考察了反应温度、敌草隆浓度、过硫酸钠投加量、初始pH值以及地下水中几种典型阴离子（CO2-3、HCO3-和Cl-）对降解效果的影响．结果表明：热激活过硫酸盐对敌草隆的降解符合准一级动力学模型（r2＞0．95），且温度对敌草隆降解速率的影响符合阿伦尼乌斯模型（r2＞0．95）；当温度在50～70℃时，产生的活化能为（166．7±0．8）kJ/mol；准一级反应速率随过硫酸盐投量增加而增大，随初始底物浓度增大而减小；最大反应速率发生在pH值为6．3时（准一级反应速率常数kobs ＝0．003 min-1）；地下水中3种典型阴离子对降解过程的抑制程度为CO2-3＞HCO3-＞Cl-．由此可见，热激活过硫酸盐氧化法可作为降解敌草隆和其他地下水中关注较多的有机污染物的一种有效途径．
류산근자유기（SO4-·）시선택성소、양화환원전위고적자유기，화간기자유기（OH·）일양능구피운용우난강해유궤오염물적거제．문중대열격활과류산납산생SO4-·강해전형농약활초륭진행료연구，통과실험고찰료반응온도、활초륭농도、과류산납투가량、초시pH치이급지하수중궤충전형음리자（CO2-3、HCO3-화Cl-）대강해효과적영향．결과표명：열격활과류산염대활초륭적강해부합준일급동역학모형（r2＞0．95），차온도대활초륭강해속솔적영향부합아륜니오사모형（r2＞0．95）；당온도재50～70℃시，산생적활화능위（166．7±0．8）kJ/mol；준일급반응속솔수과류산염투량증가이증대，수초시저물농도증대이감소；최대반응속솔발생재pH치위6．3시（준일급반응속솔상수kobs ＝0．003 min-1）；지하수중3충전형음리자대강해과정적억제정도위CO2-3＞HCO3-＞Cl-．유차가견，열격활과류산염양화법가작위강해활초륭화기타지하수중관주교다적유궤오염물적일충유효도경．
Sulfate radical (SO4-·),a kind of radical with low selectivity and high oxidation reduction potential, can be applied to the removal of nondegradable organics,just like hydroxyl radical (OH·).In this paper,the deg-radation of a typical pesticide diuron by the sulfate radical produced by heat-activated persulfate was investigated, and the effects of temperature,diuron concentration,sodium persulfate dosage,initial pH value and some common anions (CO2-3 ,HCO3-and Cl-)in groundwater on diuron degradation were analyzed by experiments.The results show that (1 )the degradation of duiron by heat-activated persulfate follows a pseudo first-order kinetic model (r2 >0.95);(2)the effect of temperature on duiron degradation rate well accords with the Arrhenius model (r2 >0.95);(3)the apparent activation energy achieves (166.7 ±0.8)kJ/mol when the temperature ranges from 50 to 70℃;(4)the pseudo first-order degradation rate increases with the increase of persulfate dosage but with the decrease of the initial diuron concentration;(5)the observed rate constant achieves the maximum (kobs =0.003 min-1 )at pH 6.3;and (6)the degradation inhibition by anions follows the order of CO2-3 >HCO3->Cl-.It is thus concluded that the heat-activated persulfate oxidation is suitable for the degradation of organic pollutants such as diuron in groundwater.