The preparation of MoS2/δ-FeOOH and degradation of RhB under visible light

Abstract

MoS2/δ-FeOOH composite catalyst was constructed by a simple solvothermal–coprecipitation method, and the catalysts were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance (UV–vis DRS), X-ray photoelectron spectroscopy (XPS) and paramagnetic resonance spectroscopy (EPR). The results of analysis indicated that the composite was successfully prepared, and δ-FeOOH adhered to the surface of spheroidal MoS2 firmly and uniformly, with a particle size of about 1–2 µm. The introduction of co-catalyst MoS2 successfully expanded the photoresponse range of the catalyst, and constructed heterojunction with δ-FeOOH effectively inhibited the photogenerated electron-hole pair recombination. The degradation of organic dye Rhodamine B (RhB) by MoS2/δ-FeOOH activated peroxymonosulfate (PMS) under visible light was studied. The results showed that the degradation rate of RhB was 99.99% within 35 min. The excellent catalytic performance of MoS2/δ-FeOOH can be attributed to the dual-synergy of bimetallic and photocatalysis. In addition, the main active components of the MoS2/δ-FeOOH/PMS/vis system was determined to be 1O2 by free radical quenching experiment and EPR. After 5 cycles of degradation experiments, the removal rate of RhB still reached 89.68%, indicating that the material has good stability and repeatability. The MoS2/δ-FeOOH not only has good photocatalytic activity, but also has strong anti-interference ability for the actual water matrix degradation. Therefore, the MoS2/δ-FeOOH has a excellent application prospect in practical wastewater treatment.