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Preparation and performance of a coal gasification slag-based composite for simultaneous immobilization of Cd and As

同时固定Cd和As煤气化渣基复合材料的制备及性能研究

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Abstract

Coal gasification slag (CGS) and Fe-modified CGS (FGS) were employed to remediate cadmium (Cd) and arsenic (As) in co-contaminated agricultural soils. Adsorption experiments in aqueous systems and stabilization experiments in soil were conducted to evaluate the passivation potential of the CGS and FGS. The maximum adsorption capacities of FGS for Cd and As were 5.82 and 9.69 mg/g, while those of CGS were only 0.99 and 0.92, respectively. X-ray diffraction patterns showed that iron oxide was successfully loaded onto FGS. And the complexation of Cd and As with Fe2O3 and FeOOH significantly improved the adsorption capacity of FGS. The concentration of soil extractable Cd (DTPA) was reduced from 0.70 to 0.58 mg/kg with FGS application, which was likely facilitated by the pH increased from 6.46 to 7.03 and the complexation of Cd with oxygen-containing functional groups or FeOOH. The concentration of dissolved As in soil decreased from 15.33 to 13.72 mg/kg owing to the complexation of As with FeOOH. By demonstrating the application potential of FGS as soil remediation agents and revealing the stabilization mechanism of Cd and As, this study is expected to facilitate the recycling of CGS as an adsorbent for soil remediation.

摘要

本研究开发了一种铁改性煤气化渣材料(FGS), 可以修复镉(Cd)和砷(As)复合污染的土壤。通过 水相吸附实验和土壤修复模拟实验评估了FGS的钝化性能。FGS对水中Cd和As 的最大吸附量分别为 5.82 和9.69 mg/g, 而CGS最大吸附量只有0.99 和0.92 mg/g。X射线衍射图显示, 铁氧化物被成功的负 载到FGS上, Cd 和As 能够与Fe2O3和FeOOH发生络合从而显著提高FGS的吸附能力。在土壤中施用 FGS后, DTPA提取Cd浓度从0.70 mg/kg降低到0.58 mg/kg, 这与土壤pH从6.46 提高到7.03 以及Cd与 含氧官能团或FeOOH的络合作用有关。由于FeOOH的络合作用, 土壤中溶解As的浓度从15.33 mg/kg 下降到13.72 mg/kg。本研究通过展示FGS作为土壤修复剂的应用潜力, 揭示Cd和As的固定机理, 为 利用气化渣制备土壤Cd、As修复材料提供了理论依据。

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Authors and Affiliations

  1. College of Water Sciences, Beijing Normal University, Beijing, 100875, China

    Chang-zhi Zhou  (周长志)

  2. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China

    Chang-zhi Zhou  (周长志), Fang Zhu  (朱芳), Hong-liang Yin  (尹宏亮), Hong Hou  (侯红) & Jun-huan Wang  (王俊欢)

  3. Technical Centre for Soil, Agricultural and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing, 100012, China

    Qian Wang  (王谦) & Zai-jin Sun  (孙在金)

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ZHOU Chang-zhi conducted the literature review and wrote the manuscript. WANG Qian, ZHU Fang, SUN Zai-jin, YIN Hong-liang edited the draft of the manuscript. HOU Hong, WANG Jun-huan developed the overarching research goals.

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Correspondence to Hong Hou  (侯红) or Jun-huan Wang  (王俊欢).

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ZHOU Chang-zhi, WANG Qian, ZHU Fang, SUN Zai-jin, YIN Hong-liang, HOU Hong, WANG Jun-huan declare that they have no conflict of interest.

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Foundation item: Projects(2020YFC1807700, 2017YFD0801302) supported by the National Key Research and Development Program of China

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Zhou, Cz., Wang, Q., Zhu, F. et al. Preparation and performance of a coal gasification slag-based composite for simultaneous immobilization of Cd and As. J. Cent. South Univ. (2024). https://doi.org/10.1007/s11771-024-5608-5

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