酸性矿山废水中FA-Sb胶体的形成研究  

Occurence of Fulvic Acid-Antimony Colloid in Acid Mine Drainage

作　　者：董莉莎 张玉芹 韦时宏[1] 郭兴强[1] 朱健[1,2] 上官立昕[3] DONG Lisha;ZHANG Yuqin;WEI Shihong;GUO Xingqiang;ZHU Jian;SHANGGUAN Lixin(College of Resources and Environmental Engineering,Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guizhou University,Guiyang 550025,China;Guizhou Karst Environmental Ecosystems Observation and Research Station,Ministry of Education,Guiyang 550025,China;North Alabama International College of Engineering and Technology,Guizhou University,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学资源与环境工程学院,喀斯特地质资源与环境教育部重点实验室,贵阳550025 [2]贵州喀斯特环境生态系统教育部野外科学观测研究站,贵阳550025 [3]贵州大学北阿拉巴马国际工程技术学院,贵阳550025

出　　处：《地球与环境》2023年第6期633-640,共8页Earth and Environment

基　　金：国家自然科学基金项目(41763018)。

摘　　要：为探究酸性矿山废水(AMD)中天然有机质(NOM)和锑(Sb)形成胶体的机制,本文采用富里酸(FA)作为代表性NOM与Sb(Ⅲ)反应,研究在此过程中FA-Sb胶体的形成情况。本研究通过室内模拟实验研究了不同初始C_((FA))/Sb条件下FA-Sb胶体的形成过程,并采用X射线光电子能谱(XPS)和傅里叶变换红外光谱(FT-IR)对FA-Sb胶体进行了表征。实验结果表明,FA可显著促进Sb与FA形成颗粒态与胶体态;初始摩尔C_((FA))/Sb越高,FA-Sb胶体的产生量越大,Zeta电位越低,颗粒粒径越小。在此过程中,FA含有的羟基等含氧官能团促进了FA-Sb胶体的形成,FA带有的负电促进了FA-Sb胶体的稳定。AMD中的少量Sb(Ⅲ)可能被FA在光照条件下产生的活性氧化物种氧化,且Sb(Ⅲ)的氧化率随C_((FA))/Sb比(0~2000)的增加而逐渐增大。该研究结果从胶体地球化学角度揭示了AMD中FA与Sb之间的相互作用关系,为深入认识AMD中Sb的地球化学行为提供了一定见解。To investigate the colloidal formation mechanism of natural organic matter(NOM) and antimony(Sb) in acid mine drainage(AMD), fulvic acid(FA) was chosen to represent NOM to react with Sb(Ⅲ). Thereafter, X-ray photoelectron spectroscopy(XPS) and Fourier transform infrared spectroscopy(FT-IR) were taken to characterize the FA-Sb colloids formed under different initial C_((FA))/Sb ratios. The experimental results reveal that FA significantly promoted the formation of FA-Sb particles and colloids. The higher the initial molar C_((FA))/Sb was, the more FA-Sb colloids with the lower was the Zeta potential and smaller particle size. The formation of FA-Sb colloids is facilitated by the presence of oxygen-containing functional groups such as hydroxyl groups in FA and stabilized by the negative charge of FA. A small amount of Sb(Ⅲ) in AMD might be oxidized by reactive oxygen species, produced by FA in the presence of light, and the oxidation rate of Sb(Ⅲ) gradually increased with the increasing C_((FA))/Sb ratio(0-2 000). The results of this study highlight the interaction between FA and Sb in AMD from the colloid geochemical perspective, and provide deeper insights into the geochemical behavior of Sb in AMD.

关 键 词：酸性矿山废水 富里酸 锑 胶体形成 

分 类 号：X131.2[环境科学与工程—环境科学]