The polymerization reaction of methyl acrylate (MA) was performed to immobilize poly(methyl acrylate) (PMA) brushes on the corncobs using atom transfer radical polymerization (ATRP) technology.Two kinds of carboxylate/corncobs graft copolymer (MC-g-PAA-Na and MC-g-PAA-K) were prepared through hydrolysis with NaOH and t-BuOK in order to introduce high densities of carboxyl groups on the corncobs,respectively.Thermodynamic study shown that the adsorptions of Cd2+ and Ni2+ by the copolymers were spontaneous,endothermic,and accompanied by an increase in randomness.These processes were more in line with Langmuir model,belong to single-layer adsorption.Following the pseudo-second-order reaction mechanism,they was belong to chemical adsorption.The maximum adsorption capacities of MC-g-PAA-K for Cd2+ and Ni2+ were 158.2mg/g and 95.51mg/g,respectively,which were 2.05 times and 1.93 times of the maximum adsorption capacities of MC-g-PAA-Na for Cd2+ and Ni2+,indicating that the adsorption capacities for heavy metal ions can be effectively improved through hydrolysis by t-BuOK with larger steric hindrance.
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基金资助
国家自然科学基金青年项目(31701566)
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