Photocatalytic Performance and Degradation Pathway of Rhodamine B with TS-1/C3N4 Composite under Visible Light

Abstract

TS-1/C 3 N 4 composites were prepared by calcining the precursors with cooling crystallization method and were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD), UV-Vis diffuse reflection spectrum (DRS) and nitrogen adsorption-desorption isotherm. The photocatalytic performance of TS-1/C 3 N 4 composites was investigated to degrade Rhodamine B (RhB) under visible light irradiation. The results showed that all composites exhibited better photocatalytic performance than pristine TS-1 and C 3 N 4 ; TS-1/C 3 N 4 -B composite (the measured mass ratio of TS-1 to C 3 N 4 is 1:4) had best performance, with a rate constant of 0.04166 min −1 , which is about two and ten times higher than those of C 3 N 4 and TS-1, respectively. We attributed the enhanced photocatalytic performance of TC-B to the optimized heterostructure formed by TS-1 and C 3 N 4 with proper proportion. From the results of photoluminescence spectra (PL) and the enhanced photocurrent, it is concluded that photogenerated electrons and holes were separated more effectively in TS-1/C 3 N 4 composites. The contribution of the three main active species for photocatalytic degradation followed a decreasing order of ·O 2 − , ·OH and h + . The degradation products of RhB were identified by liquid chromatography tandem mass spectrometry (LC-MS/MS), and the possible photocatalytic degradation pathways were proposed.

Structural, Optical, and Photocatalytic Properties of ZnSe Nanoparticles Influenced by the Milling Time

“…The obtained results partly confirmed the impact of milling on the improved photocatalytic activity of ZnSe samples. Based on other reports [35][36][37] and our obtained results, degradation mechanisms can be described in Figure 9.…”

“…The obtained results partly confirmed the impact of milling on the improved photocatalytic activity of ZnSe samples. Based on other reports [35][36][37] and our obtained results, degradation mechanisms can be described in Figure 9. Firstly, ZnSe catalyst absorbs UV light with an energy of hν to generate electron (e − ) and hole (h + ) pairs in the valence band (VB) and conduction band (CB), respectively, according to the following equation:…”

Understanding the Role of Silver Nanostructures and Graphene Oxide Applied as Surface Modification of TiO2 in Photocatalytic Transformations of Rhodamine B under UV and Vis Irradiation

“… The reaction path [ 22 , 44 , 55 , 63 ] and possible photocatalytic mechanism of the three-component systems with different surface architecture occurring for photocatalysis of RhB performed under Vis radiation. Green arrows correspond to the flow of electrons in TiO 2 -AgNS-GO composite.…”

Preparation and study of Z-type heterojunction composite photocatalytic material with Ag2MoO4 modified rosette-like Bi2WO6 with Ag-SPR promoting effect

“…Under natural conditions , they cannot self-decompose [1], so that we must nd green and environment-friendly methods to manually remove these hazardous organic pollutants. In recent years, semiconductor-based photocatalysis technology has developed rapidly, which is a new and green technology, and has been widely used in organic pollutant degradation, sterilization, and water separation [2][3]. The application of semiconductor catalytic technology has become more and more attractive in many aspects.…”