Study on the adsorption behavior and mechanism of Cu(II) on fulvic acid

The adsorption batch method was used to study the adsorption mechanism of Cu(Ⅱ).Meanwhile,the effects of time,pH and temperature on the adsorption process was also investigated.The result showed that when pH was 6.5～10.5,adsorption was larger and stable and did not vary with the variable pH.While pH was 7,the amount of adsorption became bigger with the longer time.From the adsorption isotherms curve,we can find that the adsorption of Cu(Ⅱ) on fulvic acid is an endothermic program and also in accord with the Freundlich adsorption isotherms model.The adsorption caloric △H is 36.247 5 kJ/mol.