磁性HAP/Fe<sub>3</sub>O<sub>4</sub>材料去除水土环境中Cd的效果研究

尹文华; 刘迎春; 王杰; 王圣森; 王小治; 尹微琴

文章摘要

尹文华,刘迎春,王杰,王圣森,王小治,尹微琴.磁性HAP/Fe₃O₄材料去除水土环境中Cd的效果研究[J].农业环境科学学报,2022,41(7):1537-1543.

磁性HAP/Fe₃O₄材料去除水土环境中Cd的效果研究

Effects of removing cadmium from soil and water using magnetic hydroxyapatite/triiron tetroxide material

投稿时间：2021-11-25

DOI：10.11654/jaes.2021-1371

中文关键词: 米糠羟基磷灰石(HAP) Fe₃O₄ Cd 纳米材料

英文关键词: rice bran hydroxyapatite (HAP) Fe₃O₄ cadmium nano-material

基金项目:国家重点研发计划项目(2021YFD1700800);江苏省六大人才高峰创新团队项目(2018-TD-JNHB-012);江苏省333高层次人才培养工程项目(BRA2020300)

作者	单位	E-mail
尹文华	扬州大学环境科学与工程学院, 江苏扬州 225127
刘迎春	扬州大学环境科学与工程学院, 江苏扬州 225127
王杰	扬州大学环境科学与工程学院, 江苏扬州 225127
王圣森	扬州大学环境科学与工程学院, 江苏扬州 225127
王小治	扬州大学环境科学与工程学院, 江苏扬州 225127
尹微琴	扬州大学环境科学与工程学院, 江苏扬州 225127	wqyin@yzu.edu.cn

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中文摘要:

为探究磁性羟基磷灰石/四氧化三铁(HAP/Fe₃O₄)纳米材料对水土环境中Cd的去除效果,以米糠为原料,采用水热法制备纳米材料,通过水中吸附实验和土壤培养实验对Cd去除效果进行研究。结果表明:pH为8时,HAP/Fe₃O₄对Cd的吸附更符合伪二阶动力学模型,吸附过程以化学吸附为主。溶液为酸性时,HAP/Fe₃O₄对Cd²⁺的吸附机制可能为表面吸附和生成沉淀,溶液为中碱性时,对Cd²⁺的去除以表面吸附以及离子交换为主。此外,HAP/Fe₃O₄在5次循环后吸附能力仍保持在较高水平,说明其作为吸附剂具有较高的可重复利用性。在土壤实验中,土壤pH随培养时间的延长和HAP/Fe₃O₄投加量的增加,总体呈上升趋势。与对照组相比,HAP/Fe₃O₄添加量为0.5%的处理显著降低了土壤CaCl₂提取态Cd含量,降幅为62%;浸出实验证明HAP/Fe₃O₄增强了土壤中重金属的滞留能力。HAP/Fe₃O₄纳米材料作为一种原料价格低廉且环境友好的吸附剂在处理水污染和修复土壤方面应用前景广阔。

英文摘要:

This study investigated the effect of removing cadmium from soil and solution environments using magnetic hydroxyapatite/triiron tetroxide (HAP/Fe₃O₄) nanomaterials. Rice bran was used to prepare nanomaterials using the hydrothermal method, and the cadmium removal capacity was studied through water adsorption and soil culture experiments. The results showed that the adsorption data were more consistent with the pseudo-second-order kinetic model when the pH was 8 and the adsorption process was dominated by chemisorption. The adsorption mechanisms could be surface adsorption and precipitation formation when the solution was acidic, whereas when the solution was neutral and alkaline, the removal of Cd²⁺ was mainly due to surface adsorption and ion exchange. Furthermore, the adsorption capacity of HAP/Fe₃O₄ remained relatively high after five cycles, which implied that it possessed high reusability as an adsorbent. In the soil experiment, the pH of the soil increased with the extension of incubation time and increase in material dosage. Compared with the control group, the treatment supplemented with 0.5% HAP/Fe₃O₄ significantly reduced the content of extracted Cd in the soil by 62%. Leaching experiments showed that HAP/Fe₃O₄ enhanced the retention capacity of heavy metals in soil. As low-cost raw materials and environmentally friendly adsorbents, HAP/Fe₃O₄ nanomaterials have broad application prospects in water pollution treatment and soil remediation.

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