期刊
TOXICOLOGICAL AND ENVIRONMENTAL CHEMISTRY
卷 97, 期 10, 页码 1289-1295出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/02772248.2015.1093129
关键词
cyanide removal; oxidation; peroxide hydrogen; activated alumina; kinetics
This work is dedicated to the removal of free cyanide from aqueous solution by oxidation with hydrogen peroxide H2O2 catalyzed by neutral activated alumina. Effects of initial molar ratio [H2O2](0)/[CN-](0), catalyst amount, pH, and temperature on cyanide removal have been examined. The presence of activated alumina has increased the reaction rate showing thus, a catalytic activity. The rate of removal of cyanides increases with rising initial molar ratio [H2O2](0)/[CN-](0) but decreases at pH 10 to 12. Increasing the alumina amount from 1.0 to 30g/L has a beneficial effect, and increasing the temperature from 20 degrees C to 35 degrees C improves cyanide removal. The kinetics of cyanide removal has been found to be of pseudo-first-order with respect to cyanide and the rate constants have been determined.
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