Adsorption of Pb2+ and Cd2+ on silica-modified and nitrogen self-doped lotus leaf biochar: Adsorption behavior and mechanism

IF 3.7 3区生物学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Biochemical Engineering Journal Pub Date : 2025-07-19 DOI:10.1016/j.bej.2025.109873

Yuanping Li , Suzhen Hou , Yaoning Chen , Yihuan Liu , Mengyang Zhao , Hongjuan Jiang , Nianping Chi , Guowen He , Shunyao jia

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引用次数: 0

Abstract

Biochar and its modified products have received much attention in the adsorption treatment of heavy metal wastes, but there has been great potential for improvement in efficiency and cost. In this study, nitrogen-containing lotus leaves taken from lotus root harvests were pyrolyzed and modified by the silicon from industrial by-product micro-silicon powder, and then the Si-modified and nitrogen self-doped lotus leaf biochar (Si@N-BC) was prepared as an efficient material for the adsorption of Pb²⁺ and Cd²⁺ in aqueous solution. The results demonstrated that the adsorption performance of Si@N-BC was significantly enhanced than the pristine biochar, and the maximum adsorption capacities of Pb²⁺ and Cd²⁺ were estimated based on the Langmuir model to be 363.60 mg/g and 56.04 mg/g, respectively. The adsorption kinetic experiment indicated that the adsorption reaction was dominated by chemisorption. Moreover, the high performance of Si@N-BC is not only related to ion exchange and surface precipitation, but also the complexation reactions between oxygen-containing functional groups, nitrogen-containing functional groups, and silicon-containing functional groups. In conclusion, Si@N-BC is a novel and promising adsorbent that is conducive to the resourceful utilization of lotus leaf and micro-silicon powder, and its multiple functional groups can work together to achieve efficient removal of heavy metals from water.

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二氧化硅修饰和氮自掺杂荷叶生物炭对Pb2+和Cd2+的吸附：吸附行为和机理

生物炭及其改性产物在重金属废物的吸附处理中备受关注，但在效率和成本方面仍有很大的提高潜力。本研究以莲藕采得的含氮荷叶为原料，用工业副产物微硅粉中的硅进行热解改性，制备了硅改性、氮自掺杂的荷叶生物炭（Si@N-BC），作为吸附水溶液中Pb2+和Cd2+的高效材料。结果表明，Si@N-BC对Pb2+和Cd2+的最大吸附量根据Langmuir模型分别为363.60 mg/g和56.04 mg/g，其吸附性能明显优于原始生物炭。吸附动力学实验表明，吸附反应以化学吸附为主。此外，Si@N-BC的高性能不仅与离子交换和表面沉淀有关，还与含氧官能团、含氮官能团和含硅官能团之间的络合反应有关。综上所述，Si@N-BC是一种新型且有发展前景的吸附剂，有利于荷叶和微硅粉的资源化利用，其多个官能团可以协同作用，实现水中重金属的高效去除。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Biochemical Engineering Journal 工程技术-工程：化工

CiteScore

7.10

自引率

5.10%

发文量

380

审稿时长

34 days

期刊介绍： The Biochemical Engineering Journal aims to promote progress in the crucial chemical engineering aspects of the development of biological processes associated with everything from raw materials preparation to product recovery relevant to industries as diverse as medical/healthcare, industrial biotechnology, and environmental biotechnology. The Journal welcomes full length original research papers, short communications, and review papers* in the following research fields: Biocatalysis (enzyme or microbial) and biotransformations, including immobilized biocatalyst preparation and kinetics Biosensors and Biodevices including biofabrication and novel fuel cell development Bioseparations including scale-up and protein refolding/renaturation Environmental Bioengineering including bioconversion, bioremediation, and microbial fuel cells Bioreactor Systems including characterization, optimization and scale-up Bioresources and Biorefinery Engineering including biomass conversion, biofuels, bioenergy, and optimization Industrial Biotechnology including specialty chemicals, platform chemicals and neutraceuticals Biomaterials and Tissue Engineering including bioartificial organs, cell encapsulation, and controlled release Cell Culture Engineering (plant, animal or insect cells) including viral vectors, monoclonal antibodies, recombinant proteins, vaccines, and secondary metabolites Cell Therapies and Stem Cells including pluripotent, mesenchymal and hematopoietic stem cells; immunotherapies; tissue-specific differentiation; and cryopreservation Metabolic Engineering, Systems and Synthetic Biology including OMICS, bioinformatics, in silico biology, and metabolic flux analysis Protein Engineering including enzyme engineering and directed evolution.