Adsorption of Cu(II)in water by formaldehyde crosslinked chestnut shell pigment resin
Chestnut shell pigment was extracted from agricultural and forestry chestnut shell residue and synthesized into formaldehyde crosslinked chestnut shell pigment resin.The effects of pH,adsorbate concentration,temperature and adsorp-tion time on the adsorption of Cu(II)in water were studied by oscillating balanced batch method.Quasi-first-order and qua-si-second-order kinetic models were used to fit the adsorption kinetic data,and Langmuir and Freundlich isotherm were used to fit the adsorption equilibrium data.The results showed that the optimum pH of Cu(II)adsorption was 6,the opti-mal adsorption temperature was 300 K,and the adsorption process was exothermic.The adsorption basically reached equi-librium in 60 min.The kinetic data were consistent with the quasi-second-order kinetic model,which was dominated by chemisorption.The isothermal equilibrium conformed to the Langmuir model,which was monolayer adsorption,and the maximum monolayer adsorption of Cu(II)at 300 K was 30.49 mg/g.
NETL
NSTL
万方数据
