摘要
通过化学沉淀法成功合成了纳米过氧化钙(nCP),其具有较大的比表面积(47.98 m^(2)/g)和较高的纯度(84.1%),在去除萘(NAP)的性能方面优于商用过氧化钙(CP)。相比于nCP/Fe(Ⅲ)体系,柠檬酸(CA)的螯合作用使NAP在180 min内降解率从14.1%提高至91.0%,表明CA对NAP的降解具有显著的促进作用。nCP/Fe(Ⅲ)/CA体系中存在的活性氧物种包括羟基自由基、超氧阴离子自由基和单线态氧,其中羟基自由基是NAP降解的主导自由基,超氧阴离子自由基通过加速Fe(Ⅱ)/Fe(Ⅲ)循环间接地促进NAP的降解。氯离子、腐殖酸及低浓度碳酸氢根离子对nCP/Fe(Ⅲ)/CA体系中NAP降解无明显影响,但高浓度碳酸氢根离子会显著抑制NAP的降解。在实际地下水中,通过增加药剂量可以克服实际地下水中不利因素的影响,表明nCP/Fe(Ⅲ)/CA体系在修复受NAP污染的地下水方面具有巨大潜力。
In this study,nano calcium peroxide(nCP)was successfully synthesized via chemical precipitation method,which exhibited a large specific surface area(47.98 m^(2)/g)and high purity(84.1%),demonstrating superior performance in degrading naphthalene(NAP)compared to commercial calcium peroxide(CP).Compared with the nCP/Fe(Ⅲ)system,the chelating effect of citric acid(CA)significantly enhanced NAP degradation,increasing the NAP degradation efficiency from 14.1%to 91.0%within 180 min,indicating a strong promoting effect of CA on NAP degradation.The reactive oxygen species generated in the nCP/Fe(Ⅲ)/CA system included hydroxyl radicals,superoxide anion radicals,and singlet oxygen,with hydroxyl radicals being the dominant radical responsible for NAP degradation.The superoxide anion radicals indirectly facilitated NAP degradation by accelerating the Fe(Ⅱ)/Fe(Ⅲ) cycle.Chloride ions,humic acid,and low concentrations of bicarbonate ions did not significantly affect NAP degradation,whereas high concentrations of bicarbonate ions significantly inhibited NAP degradation in the nCP/Fe(Ⅲ)/CA system.In groundwater,the adverse effects of environmental conditions can be mitigated by increasing the reagent dosage,demonstrating the potential of the nCP/Fe(Ⅲ)/CA system for remediating NAP-contaminated groundwater.
作者
臧学轲
刘玉龙
吕树光
ZANG Xueke;LIU Yulong;LYU Shuguang(Shanghai Yaxin Urban Construction Co.,Ltd,200436;State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process,East China University of Science and Technology,200237:Shanghai,China)
出处
《水处理技术》
北大核心
2025年第8期84-91,共8页
Technology of Water Treatment
基金
国家自然科学基金(52470189)。
关键词
地下水修复
纳米过氧化钙
柠檬酸
活性氧物质
萘
groundwater remediation
nano calcium peroxide
citric acid
active oxygen species
naphthalene
