Adsorption of Cd2+ and Pb2+ in aqueous solution by biochars produced from the pyrolysis of different crop feedstock
Biochars were produced from the pyrolysis of wheat, corn straw and peanut husk respectively, at 350-500 . The adsorpents of Cd2+ and Pb2+ in aqueous solution by three biochars were investigated. The effect of pH, contract time, initial solution concention, adsorbent particlesize and adsorbent dose on the adsorption of Cd2+ and Pb2+ on biochars were also estimated. The results indicated that adsorption equilibrium of Cd2+ and Pb2+on biochars almost reached in 10 minutes. The equilibrium adsorption data fitted well to the Langmiur and Freundlich equation. The maximum adsorption capacities of Cd2+ and Pb2+ on biochar from corn straw was much larger than wheat straw and peanut shell. When 150mg (6 g·L-1) biochar were used, adsorption capacity of Cd2+ on three biochars was 90%, and Pb2+ on biochar from com straw was 90.30% while 52% and 47% on biochar from wheat straw and peanut shell respectively. It suggested that biochar from corn straw was expected to be good adsorbents for heavy metals removal from contaminated water:
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