桉树遗态磷灰石材料对铅污染土壤的钝化修复效应  

Passivation and Remediation Effects and Mechanisms of Plant Residual Modified Materials on Lead-Contaminated Soils

作　　者：方雅莉 朱宗强[1,2,3] 赵宁宁 朱义年 李超[4] 张立浩 FANG Ya-li;ZHU Zong-qiang;ZHAO Ning-ning;ZHU Yi-nian;LI Chao;ZHANG Li-hao(Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology for Science and Education Combined with Science and Technology Innovation Base,Guilin 541004,China;Chongqing Tongnan District Hydrological Management Station,Chongqing 402660,China)

机构地区：[1]桂林理工大学岩溶地区水污染控制与用水安全保障协同创新中心,桂林541004 [2]桂林理工大学广西环境污染控制理论与技术重点实验室,桂林541004 [3]广西环境污染控制理论与技术重点实验室科教结合科技创新基地,桂林541004 [4]重庆市潼南区水文管理站,重庆402660

出　　处：《环境科学》2020年第3期1498-1504,共7页Environmental Science

基　　金：国家自然科学基金项目(41763012,21707024,51978188);广西自然科学基金项目(2018GXNSFAA050044);广西科技计划项目(桂科AD18126018);广西创新驱动发展专项(桂科AA17204047);广西高等学校高水平创新团队及卓越学者计划项目(桂财教函[2018]319号)。

摘　　要：以自制桉树遗态羟基磷灰石复合材料(PBGC-HAP/C)为钝化修复剂,探究PBGC-HAP/C对铅污染土壤的修复影响过程和机制.结果表明,随着钝化剂的投加比例增大和钝化时间延长,钝化效果逐渐上升;钝化剂粒径减小有利于钝化效果提升.pH对钝化有较大的影响,随pH升高,钝化效果呈上升趋势,碱性环境下对铅含量为500 mg·kg^-1土壤的钝化率可以达到99%以上;含水率的增加有利于钝化效果提升,但贡献效果较小;结合作用前后材料的XRD、 FT-IR和XPS等对比分析得知, PBGC-HAP/C对铅的钝化作用主要通过吸附作用、化学配合作用和离子交换沉淀作用, pH值可间接增强其钝化效应.The specific characteristics and mechanism of passivation of Pb in soil were studied using HAP/C composite(PBGC-HAP/C) as passivation, and using proportion of PBGC-HAP/C, particle size and type of passivator, soil moisture content, soil pH value of Pb, and particle size of the material as influencing factors. The results showed that with an increase in dosage of the passivator and passivation time, the passivation effect increases gradually. Reducing the particle size of the passivator is beneficial to improving the passivation effect. pH has a greater impact on passivation, with the passivation effect obviously rising with increased pH, and the passivation rate in an alkaline environment can reach above 99%. An increase in water content is beneficial to the improvement of the passivation effect, but the contribution is not significant. Through comparative analysis of the XPS, XRD, and FT-IR of materials before and after passivation, the results indicated that the passivation of PBGC-HAP/C to Pb is mainly through direct and indirect effects. Direct effects include physical adsorption, chemical complexation, electrostatic interaction, ion exchange, and precipitation;the indirect effect is mainly enhanced by increasing the pH value of the organic matter.

关 键 词：桉树 遗态结构 羟基磷灰石 铅污染 土壤 钝化修复 

分 类 号：X171.5[环境科学与工程—环境科学]