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有色金属工程:2024,14(3)
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核桃壳生物炭对Pb2+、Zn2+的吸附特性及机制
安焱, 石晓磊, 花静静, 范百龄
(贵州民族大学 生态环境工程学院)
Adsorption of Pb2+ and Zn2+ from characteristics and mechanism on biochar produced from walnut shell
anyan, shixiaolei, huajingjing, fanbailing
(College of Ecological and Environmental Engineering, Guizhou Minzu University,)
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投稿时间:2023-10-28    修订日期:2023-11-10
中文摘要: 为探寻更为有效的Pb2+、Zn2+吸附材料和实现农林废弃物的资源化利用,以核桃壳为原料,采用限氧裂解法在600 ℃条件下制备核桃壳生物炭,分析了生物炭投加量、初始pH、吸附时间、吸附温度和初始浓度对Pb2+、Zn2+吸附的影响,并利用红外光谱(FTIR)对核桃壳生物炭吸附Pb2+、Zn2+前后进行了表征。同时利用三种等温线吸附模型和三种吸附动力学模型对其吸附过程进行分析。结果表明:核桃壳生物炭吸附Pb2+的最佳pH为5,投加量为0.1 g?L-1,在720 min时达到吸附平衡,最大吸附量为27.172 mg?g-1;而对Zn2+吸附的最佳pH为6,投加量为0.2 g?L-1,在480 min时达到吸附平衡,最大吸附量为10.800 mg?g-1。生物炭对Pb2+的吸附过程符合Elovich吸附动力学方程和Langmuir-Freundlich等温吸附方程,说明其吸附过程是一个非均相化学吸附过程,受扩散限制;而对Zn2+的吸附过程更加符合Elovich动力学方程和Freundlich等温吸附方程,表明核桃壳生物炭对Zn2+的吸附为非均相的多层吸附。
中文关键词: 核桃壳生物炭      吸附
Abstract:In order to further find more effective Pb2+, Zn2+ adsorption materials and realize resource utilization of agricultural and forestry wastes, in this study, walnut shell was used as raw material to produce biochar at 600 ℃ by limited oxygen cracking method. The effects of biochar dosage,initial solution pH, adsorption time, adsorption temperature and initial concentration on the adsorption of Pb2+ and Zn2+ were investigated. The adsorption of Pb2+ and Zn2+ by walnut shell biochar was characterized by FTIR. At the same time, three typical isotherm adsorption models and three commonly used adsorption kinetic models were used to analyze and discuss the adsorption effect. The results show that the optimal pH of Pb2+ adsorption by walnut shell biochar is 5, the dosage is 0.1 g?L-1, the adsorption equilibrium is reached at 720 min, and the maximum adsorption capacity is 27.172 mg?g-1. The optimal pH of walnut shell biochar for Zn2+ is 6, the dosage is 0.2 g?L-1, the adsorption equilibrium is reached at 480 min, and the maximum adsorption capacity is 10.800 mg?g-1.?The adsorption process of Pb2+ by walnut shell biocharcan be well fitted by Elovich kinetic equation and Langmuir-Freundlich isotherm equation, indicating that the adsorption process is a diffusion-limited heterogeneous chemisorption process. However, the adsorption process of Zn2+ by walnut shell biochar can be better fitted by Elovich kinetic equation and Freundlich isotherm adsorption equation, which indicates that the adsorption of Zn2+ is heterogeneous multilayer adsorption.
keywords: walnut shell biochar  lead  zinc    adsorption
文章编号:YSJSGC20230628     中图分类号:    文献标志码:
基金项目:过渡金属介入下木质素与废塑料催化共热解可控制备碳纳米洋葱的研究【52260018】
引用文本:
安焱,石晓磊,花静静,范百龄.核桃壳生物炭对Pb2+、Zn2+的吸附特性及机制[J].有色金属工程,2024,14(3):.

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有色金属工程:2024,(3)
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