Adsorption of Heavy Metal Cd2+by Activated Carbons Made from Wasted Tea Stalk
Activated carbon was prepared from tea stems by zinc chloride activation and high-temperature carbonization method,and Cd2+in simulated wastewater was removed by static adsorption.The effects of the amount of adsorbent,the initial mass concentration of Cd2+and the initial pH value of the solution on the adsorption of Cd2+were investigated.The surface structure of tea stalk-based activated carbon before and after adsorption was determined by FTIR.The fitting results of adsorption kinetics and adsorption iso-therm showed that the adsorption of Cd2+by tea stalk-based activated carbon followed the second-order kinetics model and the Langmuir adsorption isotherm model.The optional experimental conditions for the adsorption of Cd2+by tea stalk-based activated carbon were obtained by orthogonal experiments.
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