Synergistic adsorption–photocatalytic removal toward levofloxacin and methylene blue by silver phosphate/strontium ferrite/graphene oxide composite under visible light irradiation

Combination of adsorption and photocatalytic degradation is an effective strategy for rapid elimination of organic pollutants from contaminated water. Herein, in order to improve the dispersion of catalyst, increase the reactive sites and facilitate the recovery of catalyst, a magnetic silver phosphate/strontium ferrite/graphene oxide (ASG) ternary composite was constructed through a two-step method. According to PL, UV–vis and photoelectrochemical characterization and adsorption experimental results, the ASG exhibits enhanced light absorption, reduced band gap, increased photocurrent response and improved adsorption ability compared to Ag3PO4 and Ag3PO4/SrFeO. ASG showed remarkable adsorption–photocatalytic synergistic removal effect on levofloxacin (LEO) and methylene blue (MB). At room temperature, for 20 mg/L of initial LEO concentration, 0.67 g/L of ASG can absorb 80.7