通过“碱溶-活化-水热”三者联用在低于100℃,制备出从微孔到大孔的宽范围粒径分布,表面富集含氧基团、孔隙发达的多孔吸附剂。将其用于水体铜离子的吸附,最佳吸附时间为180min;吸附剂在弱酸至碱性条件下的吸附能力较强。当铜离子溶液pH接近中性时,该吸附剂对铜离子的去除率达98.97%。铜离子溶液pH大于6时,几乎可全部去除溶液中铜离子。疏浚底泥活化吸附剂的吸附过程符合准二级吸附动力学,是以化学吸附作为主导地位的吸附过程。吸附过程的作用力是氢键力和偶极作用力为主,熵值增大的自发过程。
The combination method “alkali dissolution-zinc chloride activation-hydrothermal” was performed at less than 100℃.The adsorbent showed a wide range of particle size distribution from micropores to macropores and its surface enriched with oxygen-containing groups and the pores were developed.The adsorbent was used for the adsorption of copper ions in water,and the best adsorption time was 180min.When the pH was close to neutral,the removal rate of copper ions by the adsorbent reached 98.97%.When the pH was greater than 6,almost all copper ions in the solution can be removed.The adsorbent activated from dredged sediment correspond to Langmuir monolayer model,and its saturated adsorption capacity was 40.62mg/g.The adsorption process of the adsorbent conformed to the quasi-secondary adsorption kinetics,which mainly exhibited chemical adsorption.The force of the adsorption process was a spontaneous process dominated by hydrogen bonding force and dipole force,and the entropy value increased.
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基金资助
国家科技重大专项子课题(211126200292);第12批中国博士后基金特别资助(2019T120873);2020中央高校高新技术产业培育项目(300102290202);中交第一公路勘察设计研究院有限公司科技创新基金科研项目(KCJJ2018-10)
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