Experimental study on the adsorption and interaction of P and Cd in polluted sediment from Dongting Lake

IF 3.5 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Journal of contaminant hydrology Pub Date : 2024-10-09 DOI:10.1016/j.jconhyd.2024.104442

Ruifeng Zhu , Mengya Xu , Shunhong Huang , Zexin He

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Abstract

A series of experiments was performed to elucidate the effects of the adsorption and interaction of different concentrations of P and Cd on the availability of P and Cd. First, the sediments before and after maturation were subjected to X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and Fourier transform infrared (FTIR) spectroscopy. The results revealed that the composition and main components of the sediment were unchanged by maturation. The adsorption results fitted by the Freundlich equation revealed that the maximum concentration of Cd in the sediment changed from 979.12 mg/L to 980.92 mg/L and 1215 mg/L after the addition of 1 mg/L and 2 mg/L P, respectively. The maximum concentration of P in the sediments increased from 397.57 mg/L to 403.19 mg/L and 422.89 mg/L after the addition of Cd concentrations of 5 mg/L and 50 mg/L, respectively. A batch experiment was subsequently performed with multiple groups of P and Cd at the same concentration. The results revealed that the content of available Cd was the highest when the content of P was 180 mg/kg and that the content of available P was the highest when the content of Cd was 1 mg/kg. However, when the concentrations of P and Cd exceeded a certain level, Cd₃(PO₄)₂ precipitated. Finally, the experimental results were reverified by XPS, and the results revealed that the contents of P and Cd in the sediments increased through adsorption and precipitation between P and Cd.

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洞庭湖污染沉积物中 P 和 Cd 的吸附及其相互作用的实验研究

为了阐明不同浓度的钾和镉的吸附和相互作用对钾和镉的可利用性的影响，进行了一系列实验。首先，对成熟前后的沉积物进行了 X 射线衍射（XRD）、扫描电子显微镜（SEM）、能量色散光谱（EDS）和傅立叶变换红外光谱（FTIR）分析。结果表明，沉积物的组成和主要成分在熟化过程中没有变化。用 Freundlich 方程拟合的吸附结果表明，添加 1 毫克/升和 2 毫克/升 P 后，沉积物中镉的最大浓度分别从 979.12 毫克/升变为 980.92 毫克/升和 1215 毫克/升。添加 5 毫克/升和 50 毫克/升的镉后，沉积物中 P 的最大浓度分别从 397.57 毫克/升升至 403.19 毫克/升和 422.89 毫克/升。随后进行了多组相同浓度 P 和 Cd 的分批实验。结果显示，当 P 的含量为 180 mg/kg 时，可利用镉的含量最高；当 Cd 的含量为 1 mg/kg 时，可利用 P 的含量最高。然而，当 P 和 Cd 的浓度超过一定水平时，Cd3(PO4)2 就会析出。最后，用 XPS 对实验结果进行了还原，结果表明，通过 P 和 Cd 之间的吸附和沉淀，沉积物中 P 和 Cd 的含量增加了。

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来源期刊

Journal of contaminant hydrology 环境科学-地球科学综合

CiteScore

6.80

自引率

2.80%

发文量

129

审稿时长

68 days

期刊介绍： The Journal of Contaminant Hydrology is an international journal publishing scientific articles pertaining to the contamination of subsurface water resources. Emphasis is placed on investigations of the physical, chemical, and biological processes influencing the behavior and fate of organic and inorganic contaminants in the unsaturated (vadose) and saturated (groundwater) zones, as well as at groundwater-surface water interfaces. The ecological impacts of contaminants transported both from and to aquifers are of interest. Articles on contamination of surface water only, without a link to groundwater, are out of the scope. Broad latitude is allowed in identifying contaminants of interest, and include legacy and emerging pollutants, nutrients, nanoparticles, pathogenic microorganisms (e.g., bacteria, viruses, protozoa), microplastics, and various constituents associated with energy production (e.g., methane, carbon dioxide, hydrogen sulfide). The journal''s scope embraces a wide range of topics including: experimental investigations of contaminant sorption, diffusion, transformation, volatilization and transport in the surface and subsurface; characterization of soil and aquifer properties only as they influence contaminant behavior; development and testing of mathematical models of contaminant behaviour; innovative techniques for restoration of contaminated sites; development of new tools or techniques for monitoring the extent of soil and groundwater contamination; transformation of contaminants in the hyporheic zone; effects of contaminants traversing the hyporheic zone on surface water and groundwater ecosystems; subsurface carbon sequestration and/or turnover; and migration of fluids associated with energy production into groundwater.