State Key Laboratory of Agricultural Microbiology, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; Hubei Key Laboratory of Soil Environment and Pollution Remediation, Huazhong Agricultural University, Wuhan 430070, China.
State Key Laboratory of Agricultural Microbiology, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
Environ Int. 2019 Oct;131:104995. doi: 10.1016/j.envint.2019.104995. Epub 2019 Jul 18.
The mineral-organo composites control the speciation, mobility and bioavailability of heavy metals in soils and sediments by surface adsorption and precipitation. The dynamic changes of soil mineral, organic matter and their associations under redox, aging and microbial activities further complicate the fate of heavy metals. Over the past decades, the wide application of advanced instrumental techniques and modelling has largely extended our understanding on heavy metal behavior within mineral-organo assemblages. In this review, we provide a comprehensive summary of recent progress on heavy metal immobilization by mineral-humic and mineral-microbial composites, with a special focus on the interfacial reaction mechanisms of heavy metal adsorption. The impacts of redox and aging conditions on heavy metal speciations and associations with mineral-organo complexes are discussed. The modelling of heavy metals adsorption and desorption onto synthetic mineral-organo composites and natural soils and sediments are also critically reviewed. Future challenges and prospects in the mineral-organo interface are outlined. More in-depth investigations are warranted, especially on the function and contribution of microorganisms in the immobilization of heavy metals at the complex mineral-organo interface. It has become imperative to use the state-of-the-art methodologies to characterize the interface and develop in situ analytical techniques in future studies.
矿物-有机复合材料通过表面吸附和沉淀来控制土壤和沉积物中重金属的形态、迁移性和生物可利用性。氧化还原、老化和微生物活动下土壤矿物、有机质及其相互作用的动态变化进一步使重金属的归宿复杂化。在过去几十年中，先进仪器技术和模型的广泛应用大大扩展了我们对矿物-有机组合体内重金属行为的理解。在本综述中，我们全面总结了矿物-腐殖质和矿物-微生物复合材料对重金属固定的最新进展，特别关注重金属吸附的界面反应机制。讨论了氧化还原和老化条件对重金属形态和与矿物-有机复合物的结合的影响。还批判性地回顾了重金属在合成矿物-有机复合材料和天然土壤和沉积物上吸附和解吸的模型。概述了矿物-有机界面的未来挑战和前景。需要进行更深入的研究，特别是关于微生物在复杂矿物-有机界面固定重金属中的功能和贡献。在未来的研究中，使用最先进的方法来表征界面并开发原位分析技术已经变得势在必行。
