Fe/Mn-modified rapeseed straw biochar for selective removal of Pb2+ and Cd2+ from acid mine drainage: Adsorption performance and mechanism

IF 6.2 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis Pub Date : 2025-09-20 DOI:10.1016/j.jaap.2025.107393

Hai Lin , Xiaoyin Li , Juan He , Xinru Li , Kai Meng , Yingbo Dong

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引用次数: 0

Abstract

Adsorption is an effective method for removing heavy metals from acid mine drainage (AMD), but its efficiency is often limited by the high concentration of sulfate. In this study, a Fe/Mn-modified rapeseed straw biochar (FMBC60) was synthesized by optimizing Fe/Mn ratios and pyrolysis conditions. Under acidic conditions (pH = 4, [SO₄^2-] = 300 mg/L), FMBC60 achieved removal efficiencies of 98.7 % and 84.6 % for Pb²⁺ and Cd²⁺ with maximum adsorption capacities of 180.7 and 83.4 mg/g, respectively. At a high sulfate concentration of 1000 mg/L, FMBC60 maintained high metal removal efficiencies. Mechanistic analyses revealed that the adsorption of the heavy metals mainly occurred through surface complexation with Fe/Mn oxides, precipitation of PbCO₃ and CdCO₃, and cation-π interactions, with Pb²⁺ exhibiting superior competitive adsorption capacity. FMBC60 also exhibited excellent recyclability after four cycles. Thus, FMBC60 is a promising adsorption material for acid mine drainage remediation.

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铁锰改性菜籽秸秆生物炭对酸性矿山废水中Pb2+和Cd2+的选择性去除：吸附性能及机理

吸附法是去除酸性矿山废水中重金属的一种有效方法，但其效果往往受到高浓度硫酸根的限制。本研究通过优化Fe/Mn比和热解条件，合成了Fe/Mn改性的菜籽秸秆生物炭（FMBC60）。在酸性条件下（pH = 4, [SO42-] = 300 mg/L）， FMBC60对Pb2+和Cd2+的去除率分别为98.7 %和84.6 %，最大吸附量分别为180.7和83.4 mg/g。在硫酸盐浓度为1000 mg/L时，FMBC60仍保持较高的金属去除率。机理分析表明，重金属的吸附主要通过Fe/Mn氧化物的表面络合、PbCO3和CdCO3的沉淀以及阳离子-π相互作用进行，其中Pb2+表现出较强的竞争吸附能力。FMBC60在4次循环后也表现出了优异的可回收性。因此，FMBC60是一种很有前途的酸性矿山废水修复吸附材料。

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来源期刊

Journal of Analytical and Applied Pyrolysis 化学-分析化学

CiteScore

9.10

自引率

11.70%

发文量

340

审稿时长

44 days

期刊介绍： The Journal of Analytical and Applied Pyrolysis (JAAP) is devoted to the publication of papers dealing with innovative applications of pyrolysis processes, the characterization of products related to pyrolysis reactions, and investigations of reaction mechanism. To be considered by JAAP, a manuscript should present significant progress in these topics. The novelty must be satisfactorily argued in the cover letter. A manuscript with a cover letter to the editor not addressing the novelty is likely to be rejected without review.