Abstract
The g-C3N4/MoS2 (CNMS) nanocomposites were fabricated by using one-pot synthesis method for the enhanced visible-light-driven photodegradation of ciprofloxacin (CIP). The MoS2 can be directly anchored onto the well-exfoliated g-C3N4 nanosheets to form CNMS nanocomposites. The CNMS nanocomposites possess excellent mesoporous structure with continuous pore texture, which can readily transport electrons to enhance the visible-light response as well as to significantly decrease the charge recombination rate. The as-prepared CNMS heterojunction exhibits excellent adsorption and photocatalytic synergistic effect on CIP removal, and the maximum adsorption capacity is 41.0 mg g−1. Moreover, the photoactivity of CNMS is a function of pH, catalyst dosage, and initial CIP concentration, and the photodegradation behavior of CIP over CNMS can be described by a second-order rate equation. The optimal rate constant is 9 × 10−4 L mg−1 min−1 at pH 5. A nearly complete removal efficiency of CIP can be achieved through the adsorption and photodegradation when the CIP concentration is < 20 mg L−1. Moreover, the CNMS nanocomposites have excellent structural stability, physicochemical stability and good reusability after five cycles. Meanwhile, •O2− is the primary reactive species for the photodegradation of CIP and a possible reaction mechanism for CIP photodegradation is proposed. This work has elaborated a new insight of synthesizing highly efficient and environmentally stable photocatalysts by engineering the surface heterojunction via one-pot method for the water and wastewater purification.
Published Version
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