Negatively charged nano-hydroxyapatite can be used as a phosphorus fertilizer to increase the efficacy of wollastonite for soil cadmium immobilization

文献类型： 外文期刊

第一作者： Huang, Rong

作者： Huang, Rong;Mao, Peng;Qin, Guoming;Zhou, Jinge;Zhang, Jingfan;Li, Zhian;Wu, Jingtao;Huang, Rong;Mao, Peng;Qin, Guoming;Zhou, Jinge;Zhang, Jingfan;Li, Zhian;Wu, Jingtao;Xiong, Lei

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关键词： Cadmium immobilization; Microbial community; Nano-hydroxyapatite; Organic acids; Wollastonite

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：13.6； 五年影响因子：12.7 ）

ISSN： 0304-3894

年卷期： 2023 年 443 卷

页码：

收录情况： SCI

摘要： Improper application of phosphorus (P) fertilizer during soil cadmium (Cd) immobilization reduces the efficiency of fertilizer and Cd remediation. In this study, we synthesized three types of nano-hydroxyapatite (NHAP) with different surface charges as slow-release P fertilizers during Cd immobilization. We also evaluated the effects of wollastonite application with or without NHAP addition, in comparison with triple superphosphate (TSP) or bulk hydroxyapatite, on Cd accumulation in Amaranthus tricolor L. The results showed that adding wollastonite significantly reduced P availability (23.5%) in the soil, but it did not inhibit plant P uptake. In wollastonite-amended soil, the application of negatively/positively charged NHAP significantly increased plant biomass by 643-865% and decreased Cd uptake by 74.8-75.1% compared to the unamended soil as well as showed greater efficiency than those with TSP. This was ascribed to the increased soil pH (from 3.94 to 6.52-6.63) and increased abundance of organic acids (including citric acid, malic acid, lactic acid, and acetic acid) secreted by plants. In addition, the P-preferring bacterial class Bacteroidia was specific to soils amended with both wollastonite and NHAP-. These results suggest that NHAP-may be an appropriate P fertilizer for soil Cd immobilization using wollastonite.

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