Performance of Fe/Cu modified rice husk biochar on diclofenac sodium adsorption
Rice husk was used to prepare iron-copper modified biochar(FCBC300),and its physicochemical properties were characterized by using Fourier transform infrared spectroscopy,X-ray diffraction spectroscopy,elemental composition analysis,and scanning electron microscopy.The effect and mechanism of diclofenac sodium(DCF)removal by FCBC300 were investigated through adsorption batch tests at different pH,interfering ions and organic humic acid(HA).The results showed that Fe3O4,γ-Fe2O3,and CuO loading onto the surface of FCBC300 could increase its aromaticity and decrease its hydrophilicity,as well as largely increase the adsorption performance on DCF.The adsorption capacity of DCF on FCBC was about 20 times that of the unmodified rice husk charcoal at pHs of 5～9.Electrostatic interactions dominated the adsorption mechanism.The coexisting PO43-had hardly effect on DCF removal,while coexisting SO42-,Cl-,and HCO3-slightly inhibited DCF removal with less than 5％reduction rate.HA had an obviously inhibitory effect on DCF adsorption on FCBC300.The fitting results with adsorption kinetic and isothermal modes revealed that the DCF adsorption process on FCBC300 was more consistent with the quasi-first-order kinetic model and the Langmuir model.The maximum adsorption capacity was estimated to be 476.190 5 mg·g-1.FCBC300 is a promising material for wastewater treatment because of its strong adsorption capabilities,anti-ion interference,and pH buffering capabilities.
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