Abstract
In this work, sludge biochar loaded with manganese oxides (MBC) was prepared by impregnation-pyrolysis method for removing Cd(II) contamination in wastewater. Adsorption experiments indicated that under the optimal conditions of an impregnation ratio of 1:2, a dosage of 50 mg, and an initial solution pH of 4.0, the removal of Cd(II) by MBC reached an optimal value of 97.56 %. Cations K+, Na+, Ca2+, and Mg2+ as well as anions Cl- and NO3- did not affect the removal of Cd(II) by MBC, whereas PO43- and CO32- enhanced the removal of Cd(II) by MBC. Notably, the presence of humic acid promoted the removal of Cd(II) by MBC. Similarly, MBC performed excellently in Cd(II) removal from natural water body. The behavior of Cd(II) removal by MBC was well described by pseudo second order kinetic model and Langmuir model. The utmost removal capacities of Cd(II) on MBC reached 201.61 mg/g at 298.15 K. After the fifth regeneration, the Cd(II) removal on MBC maintained above 80 %. The potential mechanisms for removing Cd(II) by MBC included complexation, Cd(II)-π interactions, co-precipitation, and cations exchange. Above results showed that manganese oxides loading effectively increased removing Cd(II) on sludge biochar.
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