摘要
采用静态吸附实验方法,以一步水热碳化法制备的磁性氨基功能化生物炭(Fe_(3)O_(4)@C-NH_(2))为吸附剂,重点考察了pH、共存离子对水中Cr(Ⅵ)去除性能的影响,并结合光谱学分析探究了Cr(Ⅵ)的吸附去除机制.结果表明,Cr(Ⅵ)去除率随pH值升高而降低,pH为2时Cr(Ⅵ)去除率高达95.8%;总铬去除率随p H值变化特征与Cr(Ⅵ)一致,但p H为2时总铬去除率为81.8%.Cr(Ⅵ)去除率随SO42-浓度增加而降低,总铬去除率随SO_(4)^(2-)浓度变化趋势与Cr(Ⅵ)基本相同,但Cr(Ⅵ)去除率显著高于总铬.准二级动力学模型可以很好地描述Fe_(3)O_(4)@C-NH_(2)对Cr(Ⅵ)的吸附行为.除离子交换、孔填充、氢键及静电作用外,吸附去除Cr(Ⅵ)的主要机制是配位和还原作用.
Magnetic amino-functionalized biochar(Fe_(3)O_(4)@C-NH_(2))prepared by one-step hydrothermal carbonization was used as adsorbent for Cr(Ⅵ)removal in this study,in which the effects of pH and coexisting ions on the removal rate were investigated by static adsorption method,and then the mechanism of adsorption removal was explored by combining the spectroscopic analysis.Results showed that the removal rate of Cr(Ⅵ)decreases with the increment of pH values of the aqueous solution,and the removal rate of Cr(Ⅵ)can reach 95.8%when pH equals 2.The variation characteristics of total chromium removal rate with pH value are consistent with that of Cr(Ⅵ),although the removal rate of total chromium at pH equals 2 only achieves 81.8%.The removal rate of Cr(Ⅵ)decreases with the increment of SO_(4)^(2-)concentration,and the trend of total chromium removal rate with SO_(4)^(2-)concentration is similar to that of Cr(Ⅵ);however,the removal rate of Cr(Ⅵ)was significantly higher than that of total chromium.The adsorption behavior of the adsorbent for Cr(Ⅵ)can be well described by the quasi-second order kinetic model.In addition to ion exchange,pore filling,hydrogen bonding and electrostatic interaction,this paper concluded that the coordination interaction and reduction are the main mechanisms for adsorption and removal of Cr(Ⅵ).
作者
王诗生
刘玉虎
盛广宏
刘轶鋆
刘玲
江用彬
缪曼君
张铭
WANG Shisheng;LIU Yuhu;SHENG Guanghong;LIU Yiyun;LIU Ling;JIANG Yongbin;MIAO Manjun;ZHANG Ming(School of Energy and Environment,Anhui University of Technology,Ma'anshan 243002;Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education,Anhui University of Technology,Ma'anshan 243032)
出处
《环境科学学报》
CAS
CSCD
北大核心
2023年第4期289-297,共9页
Acta Scientiae Circumstantiae
基金
生物膜法水质净化及利用技术教育部工程研究中心开放基金资助项目(No.BWPU2021KF07,BWPU2021ZY02)
安徽省大学生创新创业训练项目(No.S202110360397,S202210360412)。
