• 关键词：锑-萘复合污染土壤  土壤淋洗修复  羧甲基-β-环糊精（CMCD）  吸附机理  工艺参数

• 基金项目：国家重点研发计划（No.2019YFC1805201）

• 王汉宇
• 同济大学环境科学与工程学院，长江水环境教育部重点实验室，上海 200092

• 杨长明
• 同济大学环境科学与工程学院，长江水环境教育部重点实验室，上海 200092

• 摘要：为了探究羧甲基-β-环糊精（CMCD）对重金属锑（Sb）-萘（Nap）复合污染土壤的淋洗效果及修复机理，采用批量振荡淋洗和实际土柱淋洗的方法，比较了不同条件下的淋洗效果.结果表明，10 g·L^-1的CMCD淋洗效果最好，在pH=4时更有利于其对锑和萘的吸附，最大去除率分别达到94.82%和93.59%.土柱淋洗实验表明，淋洗速率为2 mL·min^-1时效果最好，且间隔淋洗效果略好于连续淋洗，污染物穿透曲线则表明CMCD对萘的吸附迁移作用更大.对淋洗前后的环糊精材料采用3种方式进行表征， FTIR检测结果表明CMCD主要通过表面的羧基、羟基与Sb络合从而将其吸附去除；核磁氢谱和热重分析结果表明CMCD的空腔与萘发生了包合作用.因此，本研究证明CMCD主要通过表面基团络合-Sb、内部空腔包合-萘的方式修复复合污染土壤，可作为性能良好的淋洗剂应用于重金属与多环芳烃复合污染土壤修复工艺中，为环糊精在场地复合污染修复的应用提供一定的理论和参数支持.

• Abstract：In order to investigate the leaching remediation mechanism of carboxymethyl-β-cyclodextrin （CMCD） on antimony （Sb）-naphthalene （NAP） compound contaminated soil， the method of oscillating leaching and soil column leaching were used to compare the leaching effect under different conditions. The results showed that the leaching efficiency of CMCD at 10 g·L^-1 level was the best， and the maximum removal percentages of Sb and Nap reached 94.82% and 93.59% at pH=4， respectively. The soil column leaching experiment showed that the best remediation efficiency was achieved when the leaching rate was 2 mL·min^-1， and the effectiveness of interval leaching was slightly better than that of continuous leaching. The pollutant penetration curve indicated that CMCD had a greater adsorption and migration effect on naphthalene. Before and after leaching， cyclodextrin was characterized by three methods. FTIR results showed that Sb was mainly adsorbed and removed by carboxyl group and hydroxyl group on the CMCD surface. The results of HNMR and TG showed that the cavity of CMCD was encapsulated with naphthalene. Therefore， this paper proved that CMCD could enhance the leaching effectiveness of the combined contaminated soil mainly by the process of complexing-Sb with surface groups and encapsulating -naphthalene with internal cavities. The present results implied that the CMCD could be used as a good eluent for remediation of the combined contaminated soil with heavy metals and PAHs. The results provided theoretical and parameter support for the application of cyclodextrin in site complex pollution remediation.

• Key words：Sb-Nap combined contaminated soil  soil remediation by leaching  carboxymethyl-β-cyclodextrin（CMCD）  adsorption mechanism  process parameters

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