Quantitative Analysis of The Components in Rice Husk Biochar for Adsorbing Cadmium and Lead in Aqueous System
To quantitatively evaluate the contribution rate of different components in biochar adsorbing Pb2+and Cd2+,rice husk biochar was prepared by pyrolysis at various temperatures.Then water-soluble matter(WM),acid-soluble matter(AM)and organic matter(OM)of biochar were separated by washing and pickling.Pb2+and Cd2+adsorption performance of pristine biochar(BC),water-washed biochar(WB)and acid-washed biochar(AB)have been investigated in detail.Kinetic and isothermal results showed that the adsorption of Pb2+and Cd2+mainly related to Chemisorption.The contribution of components to Pb2+was WM(44.0%～54.5%)>AM(28.5%～31.0%)>OM(14.5%～27.6%),and to Cd2+was WM(49.0%～61.0%)>AM(25.9%～29.0%)>OM(13.1%～22.0%).The results indicated that inorganic components controlled Pb2+and Cd2+adsorption,in which,ion exchange and surface precipitation were the main mechanisms.
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