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Phosphorus-loaded coconut biochar: A novel strategy for cadmium remediation and soil fertility enhancement

文献类型： 外文期刊

作者： Chu, Xiao 1 ; Rao, Yingzhi 1 ; Qu, Jizhen 1 ; Zhang, Jingmin 2 ; Zeng, Ri 1 ; Kong, Yipeng 1 ; Xi, Zimin 1 ; Zhu, Zhiqiang 3 ; Li, Dong 3 ; Li, Jianhong 2 ; Zhao, Qingjie 1 ;

作者机构： 1.Hainan Univ, Sch Trop Agr & Forestry, Danzhou 571700, Peoples R China

2.Chinese Acad Trop Agr Sci, Rubber Res Inst, Haikou 571101, Peoples R China

3.Hainan Univ, Sch Environm Sci & Engn, Key Lab Agroforestry Environm Proc & Ecol Regulat, Haikou 570228, Peoples R China

4.Hainan Observat & Res Stn, Danzhou Soil Environm Rubber Plantat, Danzhou 571700, Peoples R China

关键词： Modified biochar; Phosphorus-loading; Soil remediation; New fertilizer; Biomass-waste utilization

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.1； 五年影响因子：6.4 ）

ISSN： 0147-6513

年卷期： 2024 年 285 卷

页码：

收录情况： SCI

摘要： The management of cadmium (Cd) contamination in soils poses a significant environmental challenge. This study investigates the effectiveness of phosphorus (P)-loaded coconut biochar, synthesized at various pyrolysis temperatures (450 degrees C, 500 degrees C, 550 degrees C, and 600 degrees C), in immobilizing Cd and enhancing P availability in soil environments. The biochar underwent a series of treatments including activation and P enrichment, followed by incubation trials to evaluate its performance in Cd immobilization and P bioavailability enhancement across varying soil concentrations (0.5 %, 1.0 %, and 2.0 %) over time periods of 15, 30, and 45 days. Remediation progress was monitored using phytotoxicity assessments with radish (Raphanus sativus) root length as a bioindicator, supplemented by urease activity analyses. Notably, the activation process increased the P loading capacity of biochar produced at 450 degrees C, 500 degrees C, and 550 degrees C by 54.6 %, 72.4 %, and 51.8 %, respectively, while reducing the P retention capacity of biochar prepared at 600 degrees C by 31.0 %. The biochar activated at 550 degrees C presented the highest efficiency in remediating Cd-contaminated soils. Key findings indicate that the enhanced specific surface area and oxygenated functional group content of the activated biochar facilitated Cd adsorption and P uptake. The P-loaded biochar exhibited a substantial adsorption capacity for Cd, particularly effective at lower concentrations, rendering it highly suitable for soil remediation purposes. Additionally, the study revealed that the application of biochar led to an increase in soil pH, resulting in precipitation of Cd as hydroxide species and formation of insoluble complexes with phosphate ions, thereby reducing its bioavailability. In summary, incorporating P-loaded biochar into soil significantly improved soil quality and enhanced Cd passivation in contaminated soils. The utilization of biochar produced at 550 degrees C, which exhibited optimal performance, suggests a practical and sustainable approach for soil remediation. Future research endeavors should prioritize the refinement of the biochar production process to enhance cost-effectiveness while maintaining high P loading efficiency.

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