Adsorption of Cu2+ wastewater with modified corn straw
Received date: 2010-02-25
Online published: 2019-06-03
The influence of sorbent dosage, pH, temperature and contact time on the adsorption of Cu2+ by using modified corn straw have been studied. The results show that the adsorption rate of Cu2+ in the simulated wastewater is about 97.2%, and adsorption capacity is about 10 mg/g, when the dosage of corn straw is about 0.3 g (6 g/L),pH 6.5-7.0,adsorbing temperature 298 K and absorbing equilibrium time 35 minutes to the Cu2+ wastewater whose mass concentration is less than 50 mg/L. The adsorption capacity of modified corn straw to Cu2+ increases with the increase of Cu2+ equilibrium concentration in the solution, temperature, and absorbing time. The adsorption process can be fitted very well by Langmuir, Freundlich and Temkin equation. Among them, Langmuir equation described best. Its saturated adsorption capacity is 12.195 mg/g. The adsorption of Cu2+ with modified corn straw is a spontaneously endothermic reaction that reaches a stable balance within 35 min. Elovich equation is the best model to described the dynamics characteristic of Cu2+.
Key words: modified corn straw; copper ions wastewater; adsorption
Liu Jiangguo, Chen Yucheng, Li Jiexia, Liu Bo, Jiang Xiaoli . Adsorption of Cu2+ wastewater with modified corn straw[J]. Industrial Water Treatment, 0 : 18 -21 . DOI: 10.11894/1005-829x.2010.30(6).18
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