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为提高膜对水溶液中铜离子的吸附效果,采用共缩聚法制备了氨基功能化介孔二氧化硅(AFMS)微球,然后将AFMS微球与聚偏氟乙烯(PVDF)以不同质量比共混,通过浸没沉淀相转化法制备了PVDF/AFMS杂化膜.采用SEM、FTIR对膜结构进行表征,并考察PVDF/AFMS杂化膜对水溶液中Cu~(2+)(初始质量浓度为300 mg/L)的吸附效果.结果表明:AFMS成功嵌入PVDF膜中;随着AFMS质量分数、pH(<7.0)、Cu~(2+)溶液体积和接触时间的增加,杂化膜对Cu~(2+)的吸附量逐渐增大,直至达到吸附平衡;当AFMS在铸膜液固含量中所占质量分数为40%、pH值为6.0、Cu~(2+)溶液体积为20 mL、接触时间为120 min时,PVDF/AFMS杂化膜对Cu~(2+)的吸附量高达57.3 mg/g;经过5次吸附-脱附实验,该杂化膜对Cu~(2+)的吸附量为54.6 mg/g,为初始吸附量的95%以上.说明该杂化膜具有良好的吸附性能和再生性能,且操作简便.
In order to improve the adsorption of Cu (superscript 2 +) in aqueous solution, amino-functionalized mesoporous silica (AFMS) microspheres were prepared by copolycondensation method. AFMS microspheres and polyvinylidene difluoride (PVDF) The PVDF / AFMS hybrid films were prepared by immersion precipitation phase transformation.The structure of the films was characterized by SEM and FTIR, and the effects of PVDF / AFMS hybrid films on the aqueous solution of Cu ~ (2 +) (initial mass concentration of 300 mg / L). The results showed that AFMS was successfully embedded in PVDF membrane. With the increase of AFMS concentration, pH (<7.0), the volume of Cu2 + solution and the contact time, (2 +) increased gradually until the adsorption equilibrium was reached. When the concentration of AFMS was 40%, the pH value was 6.0 and the volume of Cu 2+ solution was 20 mL, When the contact time was 120 min, the adsorption capacity of PVDF / AFMS hybrid membrane to Cu 2+ was as high as 57.3 mg / g. After 5 adsorption-desorption experiments, The adsorption capacity is 54.6 mg / g, which is more than 95% of the initial adsorption capacity, indicating that the hybrid membrane has good adsorption and regeneration performance and is easy to operate.