沉积物对砷镉重金属的吸附性能研究

doi:10.3969/j.issn.2095-2198.2023.02.003

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摘要

我国河流砷镉污染形势严峻，具有超标率高、成因复杂等特点，相关科学认识薄弱，亟待深入研究.采用原子荧光光谱、原子吸收光谱及BCR连续提取法等技术及方法研究河流沉积物对As和Cd的吸附性能.研究结果表明：粒径小于53 μm的沉积物对As和Cd吸附量最大，有机质促进沉积物吸附As和Cd；沉积物对As的去除率随pH升高而降低，对Cd的去除率则相反；沉积物吸附As和Cd（25 mL、50 mg/L）效果最佳用量分别是1.0 g和0.8 g；沉积物吸附As后主要化学形态为铁锰氧化物结合态，而吸附Cd后的主要化学形态是可交换态/碳酸盐结合态.该研究为认识及控制河流沉积物中As和Cd的污染提供了科学理论依据.

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关键词: As污染')" href="#">

As污染 Cd污染沉积物吸附性能

Abstract:

The pollution of arsenic (As) and cadmium (Cd) in rivers is severe in China,with high rates of exceeding standards and complex causes.The relevant scientific understanding is urgently needed for further study.Atomic fluorescence spectroscopy,atomic absorption spectroscopy and BCR continuous extraction method were used to study the adsorption performance of As and Cd in sediments in the Xijiang river basin.The results show that sediments with a particle size of less than 53 μm have the largest adsorption capacity for As and Cd.The organic matter in sediment promotes the adsorption of As and Cd.The removal rate of As by sediments decreases with the increase of pH,while the removal rate of Cd tends to be opposite.The highest removal efficiency for As and Cd (25 mL,50 mg/L) was used as 1.0 g and 0.8 g sediments,respectively.The iron-manganese oxide-bound state and the exchangeable state/carbonate-bound state are the main existing forms of the sediments after adsorbing As and Cd,respectively.The study provides a scientific basis for understanding and controlling the behavior of As and Cd pollution.

Key words: As pollution')" href="#">

As pollution Cd pollution sediment adsorption performance

出版日期: 2023-04-29 发布日期: 2024-06-06 整期出版日期: 2023-04-29

ZTFLH:

X522

基金资助:

辽宁省自然科学基金项目（2020-BS-169）；辽宁省教育厅科研项目（LQ2020023）

引用本文:

王海博, 张诚, 王艳梅.

沉积物对砷镉重金属的吸附性能研究 [J]. 沈阳化工大学学报, 2023, 37(2): 112-117.
WANG Haibo, ZHENG Cheng, WANG Yanmei.

Study on the Adsorption Performance of Arsenic/Cadmium Heavy Metals on Sediments . Journal of Shenyang University of Chemical Technology, 2023, 37(2): 112-117.

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https://xuebao.syuct.edu.cn/CN/10.3969/j.issn.2095-2198.2023.02.003 或 https://xuebao.syuct.edu.cn/CN/Y2023/V37/I2/112

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