Green synthesized hydroxyapatite for efficient immobilization of cadmium in weakly alkaline environment

文献类型： 外文期刊

第一作者： Yan, Yubo

作者： Yan, Yubo;Yang, Jianjun;Yan, Yubo;Du, Meng;Zhang, Xiaoxin;Li, Qiao;Yan, Yubo;Jing, Liquan;Du, Meng;Zhang, Xiaoxin;Li, Qiao;Yang, Jianjun

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关键词： Green synthesized hydroxyapatite; Cd; Adsorption mechanism; Soil immobilization

期刊名称：ENVIRONMENTAL RESEARCH （ 影响因子：8.3； 五年影响因子：8.2 ）

ISSN： 0013-9351

年卷期： 2023 年 223 卷

页码：

收录情况： SCI

摘要： The development of cost-effective passivators for the remediation of heavy metal-contaminated soils has been a research hotspot and an unsolved challenge. Herein, a novel hydroxyapatite (GSCH) was synthesized by coprecipitating distiller effluent-derived Ca with (NH4)(2)HPO4 using straw-derived dissolved organic matter (SDOM) as the dispersant. Batch adsorption experiments and soil incubation tests were performed to assess the immobilization efficiency of GSCH for Cd in weakly alkaline environments. As a result, GSCH showed an excellent adsorption efficiency to Cd with a maximum adsorption amount of similar to 222 mg g(-1), which was fairly competitive compared to other similar previously materials reported. The kinetic data indicated that the adsorption of Cd on GSCH was a chemical and irreversible process, while the thermodynamic data revealed a spontaneous (Delta G degrees < 0) and endothermic (Delta H degrees > 0) adsorption process. Based on mechanism analysis, both physisorption (e.g., electrostatic attraction and pore filling) and chemisorption (e.g., ion exchange and complexation) were responsible for Cd adsorption on GSCH. Particularly, the incorporated S-DOM and hydroxyapatite phase in GSCH acted synergistically in the adsorption process. The incubation results showed that GSCH application could significantly reduce the bioavailability, phytoavailability and bioaccessibility of Cd in soil by 48.4%-57.8%, 20.4%-28.6% and 12.6%-24.0%, respectively. Moreover, GSCH application also improved soil bacterial communities and enhanced soil nutrient availability. Overall, this is the first study to demonstrate the potential application value of GSCH in Cd immobilization, providing promising insights into the development of green and cost-effective hydroxyapatite-based passivators for the remediation of heavy metal-contaminated soils.

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