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酸性矿山废水S(-II)对含铬和钼施氏矿物溶解与相转变的影响
CSTR:
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作者:
作者单位:

韩山师范学院 化学与环境工程学院，广东 潮州 521041

作者简介:

郑妍婷（1999- ），女，主要从事环境污染修复研究，E-mail：cyhs0514@163.com。
brief: ZHENG Yanting (1999- ), main research interest: environmental pollution remediation, E-mail: cyhs0514@163.com.

通讯作者:

谢莹莹（通信作者），女，博士，E-mail：xieyy@hstc.edu.cn。

中图分类号:

X703.1

基金项目:

国家自然科学基金(41907308)；广东省基础与应用基础研究基金(2020A1515010533)；广东省普通高校创新团队项目(2017KCXTD023)


Effect of S(-II) on the dissolution and phase transformation of chromium and molybdenum-doped schwertmannite under acid mine drainage conditions
Author:
Affiliation:

School of Chemistry and Environmental Engineering, Hanshan Normal University, Chaozhou 521041, Guangdong, P. R. China

Fund Project:

National Natural Science Foundation of China (No. 41907308); Guangdong Basic and Applied Basic Research Foundation (No. 2020A1515010533); The Innovation Team Program of Higher Education of Guangdong, China (No. 2017KCXTD023)

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    摘要:

    施氏矿物对酸性矿山废水中重金属的环境行为有一定的制约作用，但随着环境条件的改变，施氏矿物可能会溶解并产生相转变，从而引起重金属的再次释放。采用快速化学法合成不同铬、钼含量的重金属负载型施氏矿物，并采用流动柱法结合XRD、SEM及XPS等表征手段探究酸性矿山废水还原性S(-II)对负载不同含量铬和钼的施氏矿物溶解与相转变的影响。结果表明：淋滤液中重金属和硫离子浓度随淋洗天数的增加而下降，并随铬和钼负载含量的增加而明显下降，下降量大小顺序为Sch>0.1Mo0.06Cr-Sch>0.2Mo0.09Cr-Sch，而重金属铬和钼的释放过程以零级动力学模型描述最佳。XRD和XPS表征结果表明：未负载重金属施氏矿物处理组反应后产物主要为针铁矿，而负载的重金属在一定程度上提高了施氏矿物的稳定性，延迟了矿物的相转变。

    Abstract:

    The environmental behavior of heavy metals in acidic mine drainage (AMD) was restricted by schwertmannite. When environmental conditions change, dissolution and phase transformation of schwertmannite will occur, causing redistribution or even releasing of bound heavy metals. This study investigated the dissolution and phase transformation of rapid chemical synthetic schwertmannite which was prepared in the presence of different contents of chromium and molybdenum induced by reducibility S(-II) of acid mine drainage with flow column method combined with XRD, SEM and XPS characterization. The results show that the concentrations of heavy metals and sulfur ions in the leachates decreased with the prolongation of reaction time and the increase of Cr and Mo loading contents, also followed Sch>0.1Mo0.06Cr-Sch>0.2Mo0.09Cr-Sch. Zero-order kinetic was proved to be the best kinetic model for the release processes of Cr and Mo. In addition, according to the XRD and XPS characterization, goethite was the main products of the pure schwertmannite treatments, and the loading heavy metals can improve the stability of minerals to a certain extent and retard the phase transformation of schwertmannite.

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郑妍婷,谢莹莹,赖鹤鋆,陈柔君,唐柳玲.酸性矿山废水S(-II)对含铬和钼施氏矿物溶解与相转变的影响[J].土木与环境工程学报（中英文）,2023,45(4):201-210. ZHENG Yanting, XIE Yingying, LAI Heyun, CHEN Roujun, TANG Liuling. Effect of S(-II) on the dissolution and phase transformation of chromium and molybdenum-doped schwertmannite under acid mine drainage conditions[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2023,45(4):201-210.10.11835/j. issn.2096-6717.2022.039

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  • 收稿日期:2022-03-22
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