Adsorption Reduction Performance and Mechanism Analysis of Cr(Ⅵ)by rGO/PANI
With reduced graphene oxide(rGO)as the carrier,polyaniline(PANI)was loaded onto rGO by in-situ polymerization to increase its specific surface area,and the adsorption-reduction reaction effect of the compositeon Cr(Ⅵ)in solution was explored.The rGO/PANI composite was characterized by SEM,XRD,BET,FTIR,and XPS.The characteristics and mechanism of the adsorption reduction reaction of Cr(Ⅵ)by rGO/PANI were discussed from the perspectives of adsorption isothermal and adsorption kinetic models.The experimental results showed that the removal of Cr(Ⅵ)by rGO/PANI includes adsorption,complexation and reduction.Part of Cr(Ⅵ)was adsorbed on the surface of rGO/PANI,and part of it was reduced to Cr(Ⅲ).The reduced Cr(Ⅲ)was partly complexed on the surface of the composite,and a small amount of it diffused into the solution.The maximum removal of Cr(Ⅵ)by rGO/PANI can reach 97.61 mg/g at pH=2,of which the adsorption reduction was 73.46 mg/g,and the remaining Cr(Ⅲ)concentration in the solution was 24.13 mg/L.
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