Using Cr(Ⅲ) ion as template ion,32 kinds of Cr(Ⅲ) ion imprinted composite membranes (Cr(Ⅲ)-IICM1-32) and corresponding non-imprinted composite membranes (NICM1-32) were prepared by surface imprinting method.By optimizing the imprinting conditions,the optimal experimental conditions for preparing the membranes were:nylon-6 membrane as the base membrane,α-methacrylic acid (MAA) as the functional monomer,the molar ratio of template ion,functional monomer and crosslinking agent was 1∶4∶40,the pore-forming solvent was ethanol-water (1∶1,v/v),and the immersion time of base film was 180 s.The membrane Cr(Ⅲ)-IICM25 prepared under better conditions had better adsorption capacity (Q=109.03 μmol/g) and higher imprinting factor (α=1.85).The effect of the initial concentration,pH value and adsorption temperature of the adsorbent on the adsorption performance of Cr(Ⅲ)-IICM25 were studied.Scanning electron microscopy (SEM) and nitrogen adsorption (BET) were used to characterize the surface morphology and internal structure of Cr(Ⅲ)-IICM25 and NICM25.The results shown that Cr(Ⅲ)-IICM25 and NICM25 were mesoporous materials,and their adsorption behavior conformed to the Langmuir isotherm adsorption model,which was expected to be used for the removal of Cr(Ⅲ) in sewage.
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基金资助
国家自然科学基金(地区科学基金)(21764008)
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