Adsorptive Removal of Phosphate by Calcinated Kanuma Clay from Aqueous Solution

Shengjiong Yang, Xiaochang Wang, Pengkang Jin, Qionghua Zhang

 

ABSTRACT

The phosphate removal capacity of Kanuma clay, an inexpensive and abundantly available in Japan, has been investigated. Kanuma clay was calcinated at temperature of 600˚C, and laboratory-scale batch experiments were conducted to evaluate the efficiency for phosphate removal from aqueous solution. The major factors of the removal process, such as adsorption isotherms, adsorption kinetics, temperature, pH and desorption were investigated. The results showed that calcinated Kanuma clay was of capable in phosphate removal. The phosphate adsorption matched the Freundlich isotherms model well, and the process can be well described by pseudo-second-order kinetic model. The adsorption process was exothermic process which removal capacity decreased with the increase of temperature. The adsorption capacity was the best at pH value of 6, and the adsorbed phosphate on the calcinated Kanuma clay could be hardly desorbed in normal pH condition. These results showed that calcinated Kanuma clay processed great potential for phosphate removal from aqueous solution.

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doi:10.11912/jws.2015.5.4.109-119