Preparation of TiO2/Ag[BMIM]Cl Composites and Their Visible Light Photocatalytic Properties for the Degradation of Rhodamine B

Abstract

In order to degrade toxic pollutants such as dyes during the process of sewage treatment, considerable attention has been paid to photocatalytic technologies. In this paper, TiO2/Ag[BMIM]Cl (1-butyl-3-methyl imidazolium chloride ([BMIM]Cl)) nanocomposites were prepared with TiO2 as the carrier, silver ions as dopants and ionic liquids (IL) as modifiers. The morphologies, microstructures, crystalline structure and optical properties of the TiO2/Ag[BMIM]Cl nanospheres are investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), total organic carbon (TOC), and UV-vis diffuse reflectance spectrum (UV-vis DRS) techniques. The TiO2/Ag[BMIM]Cl nanocomposites can selectively degrade rhodamine B (Rh B) under visible light because of the unstable quaternary ammonium salt. The as-obtained nanocomposites exhibit better photocatalytic activity performance than pure TiO2, TiO2/IL, and TiO2/Ag+. The experimental results show that the Rh B degradation rate can reach 98.87% under optimized producing conditions by using the TiO2/Ag[BMIM]Cl composites as the catalyzer. It shows that simultaneous doping with silver ions and ionic liquids can significantly improve the photocatalytic activity of TiO2 in Rh B degradation, indicating the formation of photosensitive AgCl in the process of TiO2/Ag[BMIM]Cl preparation. Ag+ and IL addition exchange the band gap of TiO2 and lengthen the visible wavelength range of the composite. The material has the advantages of low cost, facile preparation and reusability with the excellent degradation effect of Rh B.

Wastewater Treatment Using High-Performance In Situ Formed Double-Heterojunction Janus Photocatalyst Microparticles Shaped via a Microfluidic Device

“…Figure b demonstrates how the RhB photodegradation rate decreases as its initial dye concentration gradually increases. When RhB concentrations are high, more visible light is absorbed by dye (RhB) molecules than PC, which reduces the photocatalytic performance . Also, the massive saturation of the active PC surface sites at higher pollutant concentrations has been identified as the cause of this phenomenon .…”

“…The pollutant concentration decreases when lighting time increases. As a consequence, the PC absorbs more visible light, which increases photocatalytic activity …”

“…When RhB concentrations are high, more visible light is absorbed by dye (RhB) molecules than PC, which reduces the photocatalytic performance. 55 Also, the massive saturation of the active PC surface sites at higher pollutant concentrations has been identified as the cause of this phenomenon. 56 The results show degradation efficacies of 97.24 and 82.44% for the RhB concentrations of 10 and 40 mg/ L, respectively.…”

Thermal Polymerisation Synthesis of g-C3N4 for Photocatalytic Degradation of Rhodamine B Dye under Natural Sunlight

“…The photocatalytic process depends on highly active substances, such as superoxide radicals (•O 2 − ), hydroxyl radicals (•OH), and holes (h + ) produced by the photocatalyst after absorbing light energy to decompose target pollutants [7]. Various photocatalysts, including TiO 2 -based [8], Bi-based [9,10], Mo-based [11], Zn-based [12], and Ag-based [13] semiconductors, have been developed and effectively removed RhB dye. Nevertheless, many of the aforementioned photocatalysts might give off precious elemental metals, introducing the risk of additional contamination caused by the release of metals from the photocatalysts.…”

Nitrogen-Doped Graphene Quantum Dot-Passivated δ-Phase CsPbI3: A Water-Stable Photocatalytic Adjuvant to Degrade Rhodamine B

“…Photocatalysis is a feasible and economic way to produce oxidative species and has been widely studied [4][5][6]. Fujishima and Honda first reported the photocatalytic performance of TiO 2 [7], and since then many scholars have investigated its photodegradation effect [8,9]. However, its wide band gap of 3.2 eV determines that only UV light can be absorbed, and visible light, the main component of sunlight, cannot be well captured by TiO 2 [10].…”