Citation:
ZOU Wei-Hua, HAN Run-Ping, CHEN Zong-Zhang, SHI Jie. Removing Copper and Lead Cations from Aqueous Solution with MOCS Fixed Bed Columns[J]. Chinese Journal of Applied Chemistry,
;2006, 23(3): 299-304.
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The adsorption ability of manganese-oxide-coated-sand(MOCS) for copper and lead cations in mono-(non-competitive) and binary-(competitive) component aqueous solutions was studied on a fixed-bed column.The influences of influent flow rate and influent metal concentration on breakthrough time during the removal of copper and lead cations from aqueous solutions on a MOCS column were quantitively determined.The results show that the breakthrough time increased when metal concentration or/and the flow rate were decreased.For mono-component metal solutions,the saturation adsorption capacities of MOCS for copper and lead cations were decreased from 17.0 μmol/g and 19.0 μmol/g to 11.3 μmol/g and 16.0 μmol/g in a flow rate range of 3.33 mL/min to 7.69 mL/min,respectively.The Thomas model was applied to predicting the adsorption breakthrough curves of copper and lead cations at different flow rates and different initial concentrations and to calculate the characteristic process parameters of the column adsorption.MOCS can be regenerated with a nitrate acid solution to ten times in keeping its adsorption capacity.The removal efficiency of metal ions would be decreased due to the presence of other heavy metal ions,but the total saturation adsorption capacities of MOCS for copper and lead cations were slightly increased.This competitive adsorption also showed that adsorption of lead cations was decreased insignificantly in the presence of copper cations,whereas the adsorption of copper cations was obviously decreased in the presence of lead cations. The removal ability of copper and lead ions from aqueous solution with MOCS columns is:Pb2+>Cu2+.The adsorbed copper and lead cations could be easily desorbed from MOCS with a 0.50 mol/L nitrate acid solution.The elution rates were affected by the flow rates and concentration of nitrate acid.
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