A Novel G‐C 3 N 4 Modified Biogenic Mackinawite Mediated by SRB for Boosting Highly Efficient Adsorption and Catalytic Degradation of Antibiotics in Photo‐Fenton Process

Abstract FeS‐based nanomaterials are widely used in Fenton‐like reaction of antibiotics degradation. However, the problems of poor stability and low reusability limit the catalytic efficiency. Herein, the study ingeniously introduced the g‐C 3 N 4 into FeS to synthesize g‐C 3 N 4 @biogenic FeS (CN‐BF‐1) nanocomposite with strong interaction of iron ions and “N‐pots” by the mediation of sulfate reducing bacteria (SRB). Results indicated the g‐C 3 N 4 accelerated SRB metabolism and improved the mineralization and stability of FeS to well‐crystallized mackinawite. The CN‐BF‐1 can efficiently adsorb and degrade antibiotics compared with FeS and g‐C 3 N 4 , and bear a broad pH range which further proved the increase of stability. The toxicity studies showed ciprofloxacin (CIP) degradation solution hardly caused ecotoxicity and induced antibiotic resistance genes, while CN‐BF‐1 can be regenerated by SRB in this solution with chemical and enzymatic reduction of Fe(III)‐mud to achieve efficient CIP degradation (99.9%). Finally, the mechanism part showed that CN‐BF‐1 can activate H 2 O 2 to form 1 O 2 and •OH which played the main roles in the catalysis process. The work paves the way for a novel approach to intensify iron‐based photo‐Fenton system in sustainable remediation of antibiotic wastewater, upon which the high‐efficiency removal and non‐toxic degradation solution of antibiotic contamination are expected.