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Na_(2)S改性生物炭高效吸附重金属离子:制备及吸附机理

High-efficiency adsorption of heavy metal ions by Na_(2)S modified biochar:preparation and adsorption mechanism
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摘要 以废弃芦苇为原料、硫化钠(Na_(2)S)为改性剂,制备了对Pb^(2+)、Cd^(2+)、Zn^(2+)具有高效吸附性能的Na_(2)S改性生物炭(BCS)。通过扫描电镜-能谱(SEM-EDS)、红外光谱(FTIR)、元素分析等手段对改性前后的生物炭进行了表征。结果显示,Na_(2)S改性能够为生物炭引入多种含硫官能团,提升孔体积并增加比表面积。Langmuir模型拟合结果表明,随着改性剂Na_(2)S溶液浓度的增加,BCS对重金属离子的吸附能力得到提升。在pH为2.0~6.0的范围内,BCS对重金属离子的吸附能力随pH增加逐步增强。在pH=6.0时,BCS对Pb^(2+)、Cd^(2+)、Zn^(2+)的最大吸附量分别为494.99、131.14、94.89 mg/g。根据动力学实验结果可知,BCS对重金属离子的吸附行为符合伪二级动力学模型。吸附机理主要包括表面官能团的络合、离子交换和静电吸附。本研究可为废弃物的再利用以及废水中的重金属的高效去除提供一种环境友好且可行的解决方案。 In this study,Na_(2)S modified biochar(BCS)with efficient adsorption properties for Pb^(2+),Cd^(2+),and Zn^(2+)was prepared by using waste reed as raw material and sodium sulfide(Na_(2)S)as modifier.The biochar before and after modification was characterized by scanning electron microscopy-EDS(SEM-EDS),infrared spectroscopy(FTIR)and elemental analysis.The results showed that the Na_(2)S modification was able to introduce various sulfurcontaining functional groups into the biochar,enhance the pore volume and increase the specific surface area.The Langmuir model fitting results indicated that the adsorption capacity of BCS for heavy metal ions was enhanced with the increase of the concentration of the modifier Na_(2)S solution.In the pH range of 2.0—6.0,the adsorption capacity of BCS on heavy metal ions was gradually enhanced with the increase of pH.At pH=6.0,the maximum adsorption amounts of BCS on Pb^(2+),Cd^(2+)and Zn^(2+)were 494.99,131.14 and 94.89 mg/g,respectively.Based on the results of the kinetic experiments,it can be seen that the adsorption behaviors of BCS on heavy metal ions were in accordance with the pseudo-secondary kinetic model.The adsorption mechanism mainly includes complexation of surface functional groups,ion exchange and electrostatic adsorption.Overall,this study provides an environmentally friendly and feasible solution for the reuse of waste and the efficient removal of heavy metals from wastewater.
作者 马林峰 欧爱彤 李志远 李垚 刘润泽 吴晓乐 徐景涛 MA Linfeng;OU Aitong;LI Zhiyuan;LI Yao;LIU Runze;WU Xiaole;XU Jingtao(School of Municipal and Environmental Engineering,Shandong Jianzhu University,Jinan 250100,Shandong,China)
出处 《化工学报》 EI CSCD 北大核心 2024年第7期2594-2603,共10页 CIESC Journal
基金 山东省高等学校“青创人才引育计划” 山东省重大科技创新工程项目(2020CXGC011406)。
关键词 生物炭 重金属 Na_(2)S 吸附 废水 biochar heavy metals Na_(2)S adsorption wastewater
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