采用浓硫酸对新型粉末状聚苯乙烯气凝胶(PPA)进行表面改性,进一步研究了改性粉末状聚苯乙烯气凝胶(mPPA)对溶液中Cd(Ⅱ)的吸附特性。结果表明:浓硫酸表面改性对PPA纳米形貌和孔结构影响不大,PPA和mPPA均呈现独特的微孔-中孔-大孔呈层次化分布的孔结构特征。表面改性可以大幅度提升气凝胶对Cd(Ⅱ)的吸附率,适当增加表面改性时间、溶液pH、吸附温度和吸附时间,有助于mPPA对溶液中Cd(Ⅱ)的吸附,其吸附率可达99.2%。mPPA对Cd(Ⅱ)的吸附动力学符合准二级动力学方程;该吸附为自发进行的吸热过程,属于物理吸附和化学吸附的协同作用,但以物理吸附为主。
The surface of a powdery polystyrene aerogel (PPA) was modified with sulphuric acid to obtain mPPA.The Cd(Ⅱ) adsorption properties of the mPPA in water were studied.It was found that the acid modification had trivial effects on the nanomorphology and pore structure,both PPA and mPPA all had a hierarchical micro-,meso- and macropore structure.However,such acid modification obviously increased the Cd(Ⅱ) adsorption efficiency.The Cd(Ⅱ) adsorption efficiency increased with modification time,pH value of solution,adsorption temperature and adsorption time,and the Cd(Ⅱ) adsorption efficiency can reach 99.2% under optimized conditions.The adsorption kinetics can be well described by a pseudo-second-order equation.And the adsorption was a spontaneous endothermic process,which was resulted from the synergistic effect of physical adsorption and chemical adsorption,but dominated by physical adsorption.
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基金资助
福建省自然科学基金项目(2019J01808);莆田市科技计划项目(2018GP2001)
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