Green preparation of carbon materials from biomass slag and steam as byproducts of power plants for efficient treatment of lead-containing wastewater

IF 5.6 1区 农林科学 Q1 AGRICULTURAL ENGINEERING
Yiping Luo , Yuqian Sun , Zhichen Zhao , Zhengyue Dai , Bin Jiang , Zhicheng Jiang , Xudong Liu , Dong Li , Fang Deng
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Abstract

Green preparation of high-performance and cost-effective carbon materials using biomass slag and steam, which were the byproducts of power plants, for efficient treatment of lead (Pb(II))-containing wastewater was investigated. The optimum carbon material CH500-800 (SBET=818.8 m2/g and Vt=0.46 cm3/g) was produced by one-step steam activation at 800 ℃ for 1 h under a 500 mL/min stream with a heating rate of 5 °C/min. The obtained CH500-800 greatly enhanced the efficiency of Pb(II) removal, achieving the maximum adsorption capacity of 191.1 mg/g. The removal of Pb(II) from wastewater was well described by the Pseudo-second-order, Elovich and Freundlich model, suggesting that it was predominantly governed by chemical adsorption and diffusion on heterogeneous surfaces. The adsorption process demonstrated a synergistic mechanism involving pore and surface adsorption, chemical interactions between oxygen-containing groups (C-O and -OH) and Pb(II), as well as Pb(II)-π interactions, which was responsible for the efficient removal of Pb(II) from wastewater. Moreover, CH500-800 retained a potential for reusability with a high adsorption stability (only 2.5 % Pb(II) desorption after 48 h) and ion selectivity (>93.0 %) in the presence of K(I), Na(I) or Ca(II). Additionally, a circular economic model was proposed to valorize biomass slag and steam in situ for treating Pb(II)-containing wastewater effectively in biomass power plants. This approach provided an innovative solution for utilizing waste to treat hazardous substances within practical engineering applications.
利用发电厂副产品生物质炉渣和蒸汽绿色制备碳材料,高效处理含铅废水
研究了利用发电厂副产品生物质炉渣和蒸汽绿色制备高性能、低成本的碳材料,用于高效处理含铅(Pb(II))废水。在 500 mL/min 的蒸汽流下,以 5 °C/min 的升温速率在 800 ℃ 下一步蒸汽活化 1 小时,制得了最佳碳材料 CH500-800(SBET=818.8 m2/g,Vt=0.46 cm3/g)。得到的 CH500-800 大大提高了对铅(II)的去除效率,最大吸附容量达到 191.1 mg/g。伪二阶、Elovich 和 Freundlich 模型很好地描述了废水中铅(II)的去除过程,表明其主要受异质表面的化学吸附和扩散作用的支配。吸附过程显示出一种协同机制,涉及孔隙和表面吸附、含氧基团(C-O 和 -OH)与 Pb(II)之间的化学作用以及 Pb(II)-π 相互作用,这是高效去除废水中 Pb(II)的原因。此外,CH500-800 还具有很高的吸附稳定性(48 小时后仅有 2.5% 的 Pb(II) 解吸)和离子选择性(93.0%),在 K(I)、Na(I) 或 Ca(II) 存在的情况下,仍具有重复使用的潜力。此外,还提出了一个循环经济模型,以就地对生物质炉渣和蒸汽进行估值,从而有效处理生物质发电厂中的含铅(II)废水。这种方法为在实际工程应用中利用废物处理有害物质提供了一种创新解决方案。
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来源期刊
Industrial Crops and Products
Industrial Crops and Products 农林科学-农业工程
CiteScore
9.50
自引率
8.50%
发文量
1518
审稿时长
43 days
期刊介绍: Industrial Crops and Products is an International Journal publishing academic and industrial research on industrial (defined as non-food/non-feed) crops and products. Papers concern both crop-oriented and bio-based materials from crops-oriented research, and should be of interest to an international audience, hypothesis driven, and where comparisons are made statistics performed.
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