首页|柠檬酸协同黄铁矿对煤矸石硅缓释及土壤砷稳定性的影响研究

柠檬酸协同黄铁矿对煤矸石硅缓释及土壤砷稳定性的影响研究

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煤矸石是煤炭开采和加工过程中产生的固体废弃物，通常由硅酸盐组成。其在提升硅的生物可利用性方面具有显著潜力，因此可作为农业用硅肥的潜在来源。然而，煤矸石硅的缓释性不足与植物的慢吸收速率存在天然矛盾，限制了煤矸石作为硅肥的应用。本研究探讨了柠檬酸和黄铁矿对煤矸石中硅的缓释效果，以及由此制备的复合物(C@PC-10)对土壤中砷的固化与稳定化作用。研究结果显示，C@PC-10能有效减缓煤矸石中硅的释放速率，在30 d的实验周期内，土壤中水溶态砷和有效态砷的去除效率分别达到71。3%和55。9%。此外，酸溶态砷的比例降低，而残渣态砷的比例增加。模拟酸雨实验进一步表明C@PC-10能够抑制土壤中砷的溶出。通过X射线衍射(XRD)、X射线光电子能谱(XPS)和傅里叶变换红外光谱(FT-IR)分析，本研究证实了球磨过程中黄铁矿的氧化及其向黄钾铁矾和FeOOH的转化。这些发现揭示了氧化黄铁矿对砷的吸附能力显著增强，表明C@PC-10复合物是一种高效的修复材料，能够调控硅酸盐的释放并有效阻碍土壤中砷的迁移。
Cooperative effect of citric acid and pyrite on the slow-release of silicon from coal gangue and the stabilization of arsenic:Implications for soil remediation
The application of coal gangue as a soil amendment shows promise in increasing silicon availability,potentially serving as a silicon fertilizer in agriculture.However,the rapid release of silicon from coal gangue compared to the slow absorption by plants hinders its effective use.This study explored the formation of iron-containing secondary minerals on coal gangue surfaces using pyrite and citric acid to stabilize arsenic in contaminated soils and slow down silicon leaching.After co-ball milling,the silicon leaching rates for coal gangue and the composite C@PC-10 were 0.44%and 0.22%at 60 min,and 1.11%and 1.38%at 120 min,respectively.Stabilization tests showed that C@PC-10 achieved removal efficiencies of 71.3%for water-extractable arsenic and 55.9%for NaHCO3-extractable arsenic over 30 d.Acid-soluble arsenic decreased from 32.8%to 24.1%,while residual arsenic increased from 26.5%to 36.9%.Acid rain simulations demonstrated that C@PC-10 limited leachate arsenic concentration to 28.9 mg/L over 120 d,compared to untreated soil with 59.8 mg/L.Analytical techniques like XRD,XPS,and FT-IR confirmed that pyrite oxidation during ball milling led to the formation of jarosite and FeOOH,enhancing arsenic adsorption capacity.Overall,the C@PC-10 composite shows promise as a remediation material for controlled silicate release and arsenic mitigation in soil environments.

arseniccoal gangueslow-release of siliconstabilization

吕鑫、冯胜元、占鸿志、雷建兰、舒自刚、周佩雯、柴喜林

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School of Chemical&Environmental Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China

Jiangxi Gaiya Environment Science and Technology Co.,Ltd.,Shangrao 334000,China

Central South(Shangrao)Metallurgical Industry Research Institute Co.,Ltd.,Shangrao 334000,China

School of Resources and Environment,Shanxi Agricultural University,Taiyuan 030031,China

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砷 煤矸石 硅缓释 固化稳定化

Science and Technology Cooperation Project-Domestic Science and Technology Cooperation(General Project)Jiangxi Province Technology Innovation Guidance Project(Science and Technology Cooperation Special Project),ChinaShangrao City Key Research and Development Project,ChinaShangrao City Science and Technology Major Project

2021YFC290260020203BDH80W0172021D0032020A005

2024

10.1007/s11771-024-5633-4

中南大学学报(英文版)
中南大学

中南大学学报(英文版)

CSTPCDEI
影响因子：0.47
ISSN：2095-2899
年,卷(期)：2024.31(4)
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