| 锰氧化物对水体中铊的去除机制研究进展 |
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| 引用本文： | 张良静,尚长健,韩旭,徐祥健,夏甫,邓圣,杨昱,姜永海.锰氧化物对水体中铊的去除机制研究进展[J].环境科学研究,2021,34(6):1387-1396. |
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| 作者姓名： | 张良静 尚长健 韩旭 徐祥健 夏甫 邓圣 杨昱 姜永海 |
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| 作者单位： | 1.中国环境科学研究院, 国家环境保护地下水污染模拟与控制重点实验室, 北京 100012 |
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| 基金项目： | 国家自然科学基金项目41977293污染场地安全修复技术国家工程实验室开放基金资助项目NEL-SRT201704 |
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| 摘 要： | 铊（Tl）是国际公认的优先控制的13种金属污染物之一，近些年频繁发生的水体Tl污染事件推动了Tl去除研究工作的进展，作为去除Tl的高效吸附剂、催化剂和氧化剂，锰氧化物是研究热点之一.该研究综述了Tl在合成锰氧化物、矿物锰氧化物、改性锰氧化物及锰氧化物复合材料上的吸附特征，总结了pH、共存离子和有机质对锰氧化物去除Tl的影响，深入探讨了Tl在锰氧化物上的吸附机制.前人的研究成果表明:经过科学改性的锰氧化物及锰氧化物复合材料在吸附选择性、可重复利用及易分离方面表现出更好的Tl去除效果.pH主要通过静电作用和氧化还原作用影响锰氧化物对Tl的去除机制，是影响锰氧化物去除Tl效率的最关键因素；共存离子和有机质分别通过竞争吸附位点和络合作用的方式抑制锰氧化物对Tl的吸附；锰氧化物去除Tl的主要机制为络合作用、氧化沉淀和静电引力，矿物锰氧化物还可以依靠离子交换和同位素分馏作用去除Tl.锰氧化物对Tl去除机制的定性和定量研究，以及不同晶型结构锰氧化物及锰氧化物与微生物的结合对地下水中Tl的去除技术是未来的研究方向.
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| 关 键 词： | 铊 锰氧化物 去除机制 影响因素 |
| 收稿时间： | 2020-07-22 |
Mechanisms of Thallium Removal from Water by Manganese Oxides: A Review |
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| Affiliation: | 1.State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, China2.College of Water Sciences, Beijing Normal University, Beijing 100875, China3.National Engineering Laboratory for Site Remediation Technologies, Beijing 100015, China |
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| Abstract: | Thallium (Tl) is one of 13 metal pollutants that are prioritized for control in the world. In recent years, frequent Tl pollution events have promoted the study of Tl removal. As an effective adsorbent, catalyst and oxidation for Tl removal, manganese (Mn) oxide is one of the research hotspots. This study reviewed the adsorption characteristics of Tl on different kinds of manganese oxides, including synthetic manganese oxides, mineral manganese oxides, modified manganese oxides and composite manganese oxides. The effects of different pH, coexisting ions and organic matter on Tl removal were summarized, and adsorption mechanisms of Tl on manganese oxides were also thoroughly discussed. The results showed that modified manganese oxides and composite manganese oxides had better removal effect in terms of adsorption selectivity, reusability and separation performance. pH dominated Tl removal efficiency of manganese oxides, and the removal mechanisms of Tl were mainly due to electrostatic interaction and redox effect. Coexisting ions inhibited the adsorption of Tl by competing for the adsorption sites, while organic matter affected the adsorption of Tl on manganese oxides by complexing with Tl. The removal mechanisms of Tl by manganese oxides mainly included complexation, oxidation precipitation, ion exchange, electrostatic interaction and isotope fractionation. Among them, complexation, oxidation precipitation and electrostatic interaction were the main removal mechanisms, while ion exchange and isotope fractionation were also believed to be involved in the removal of Tl by manganese oxides. Qualitative and quantitative interpretation of Tl removal mechanisms by manganese oxides needs to be further explored. Future research directions include the study of manganese oxides with different crystalline structures and the combination of microorganisms and manganese oxides to remove Tl in groundwater. |
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