摘要
针对重金属Cr(Ⅵ)的污染问题,以木质素磺酸钠为原料,通过Fe改性制备木质素基活性炭(SLAC),用于去除水溶液中的Cr(Ⅵ)。考察了制备过程中Fe投加比率、煅烧时间和煅烧温度对SLAC的Cr(Ⅵ)吸附容量的影响,并对优选的SLAC吸附剂进行结构表征。此外,考察了溶液pH、Cr(Ⅵ)初始浓度、吸附时间和吸附温度对吸附效果的影响,并探究了吸附剂对Cr(Ⅵ)的吸附动力学、热力学行为及循环使用性能。结果表明,当溶液pH=1、Cr(Ⅵ)初始质量浓度为20 mg L时,优选SLAC吸附剂对Cr(Ⅵ)的去除率达到98.6%。所制备的SLAC吸附Cr(Ⅵ)的过程满足准二级动力学和Langmuir等温吸附模型,且循环使用6次后的吸附性能良好。SLAC在去除Cr(Ⅵ)的过程中表现出优异的吸附性能,主要源于其对Cr离子在静电吸引、含氧官能团络合和氧化还原反应的耦合作用机制上的能力提升,为含重金属Cr(Ⅵ)的废水处理提供了新的思路。
To address the issue of heavy metal Cr(Ⅵ)pollution,lignin-based activated carbon(SLAC)was synthesized from sodium lignosulfonate via Fe modification for the purpose of removing Cr(Ⅵ)from aqueous solutions.The influences of the Fe addition ratio,calcination time,and calcination temperature on the Cr(Ⅵ)adsorption capacity of SLAC during its preparation were examined,and the preferred SLAC adsorbent was subjected to structural characterization.Furthermore,the effects of solution pH,initial Cr(Ⅵ)concentration,adsorption time,and adsorption temperature on the adsorption process were investigated,along with the adsorption kinetics,thermodynamic behavior,and recycling performance of the adsorbent for Cr(Ⅵ).The results demonstrated that the optimized SLAC adsorbent achieved a 98.6%Cr(Ⅵ)removal efficiency at pH=1 and an initial concentration of 20 mg L.Adsorption kinetics followed pseudo-second-order models,and equilibrium data conformed to the Langmuir isotherm,with excellent recyclability observed over six cycles.The superior adsorption performance stems from enhanced Cr(Ⅵ)interaction via electrostatic attraction,oxygen-functional group complexation,and redox reactions,offering a promising solution for Cr(Ⅵ)removal from wastewater.This study provides novel insights into practical Cr(Ⅵ)treatment applications.
作者
范晓宁
王芳芳
孙铭泽
邱亚茹
程明治
鲍弈帆
陈常东
Fan Xiaoning;Wang Fangfang;Sun Mingze;Qiu Yaru;Cheng Mingzhi;Bao Yifan;Chen Changdong(School of Petrochemical Engineering,Liaoning Petrochemical University,Fushun,Liaoning 113001;College of Chemical Engineering and Technology,Yantai Nanshan University)
出处
《石油炼制与化工》
北大核心
2025年第8期67-76,共10页
Petroleum Processing and Petrochemicals
基金
教育部“春晖计划”合作科研项目(2020703-8)
辽宁省教育厅项目(LJKMZ20220736,JYTMS20231424)。
关键词
铬(Ⅵ)
木质素磺酸钠
吸附机理
动力学
热力学
chromium(Ⅵ)
sodium lignosulfonate
reaction mechanism
kinetics
thermodynamics
作者简介
范晓宁,硕士研究生,主要研究方向为吸附材料等;通讯联系人:陈常东,E-mail:chencd1984@outlook.com。
