铜渣衍生制备CTAB-Fe3O4@GM吸附剂及其吸附Cr(Ⅵ)性能OA

Fe3O4@GM(iron-base geopolymer)was synthesized by copper slag as raw material,NaOH and water glass solution as activators,and then was modified with surfactant CTAB(cetyltrimethylammonium bromide)to construct CTAB-Fe3O4@GM.The synthesized CTAB-Fe3O4@GM was used as an adsorbent to efficiently remove Cr(Ⅵ)in water.The effects of pH and CTAB-Fe3O4@GM dosage on Cr(Ⅵ)adsorption performance were mainly explored,and its adsorption mechanism was analyzed through adsorption kinetics,thermodynamics,Zeta,XPS and BET.The results show that the adsorption process follows pseudo-second-order kinetics(R2=0.99)and conforms to the Langmuir isotherm model(R2=0.99),achieving a maximum adsorption capacity of 156.50 mg/g at pH=1 and 0.1 g/L CTAB-Fe3O4@GM.The removal process of Cr(Ⅵ)by CTAB-Fe3O4@GM is primarily based on chemical adsorption,including complexation,electrostatic attraction,redox and pore precipitation mechanisms.This study follows the eco-friendly concept of"waste control",demonstrating favorable economic and environmental benefits for the resource utilization and wastewater purification of solid waste-derived high-efficiency adsorbents.