Structurally engineered TiO₂–SiO₂ monolithic designs for the enhanced photocatalytic degradation of organic textile dye pollutants

Abstract

The rapid removal of organic textile dye (Acid Red-85) using mesoporous TiO2–SiO2 monoliths as photocatalyst material has been studied. The 7:3 mole% ratios of TiO2 and SiO2 within the framework provided a well-ordered cage-like monolithic design with high surface area and pore volume that facilitated faster and efficient degradation of the dye effluents. The photocatalyst has been characterized using XRD, TEM-SAED, UV–Vis-DRS, PL, TGA and BET analysis. The influence of various photocatalytic operational parameters, such as solution pH, dopant stoichiometry, catalyst dosage, dye concentration, kinetics, photo-oxidizers, etc., which could influence on the degradation efficiency, has been studied.

Enhancing the photoactivity of TiO2/SiO2 monolithic catalyst and its reusability for wastewater treatment

“…The photoactivity of (7:3 molar ratio) TiO2/SiO2 monolith was evaluated by degradation of organic textile dye (AR-85) under 16W UV light. The yield of (AR-85) degradation is nearly 97 % after 90 minutes of irradiation [7]. According to these results, coating on monolith is a potential trend to improve the activity of photocatalyst and enhance pollutant degradation yield.…”

Zinc‐Doped BiFeO3Nanoparticles: Synthesis, Characterization and Photocatalytic Activity on Acid Red‐85 Dye

“…According to PL and photocurrent investigations, the improved photocatalytic effectiveness of 7.5BFZO is due to the effective charge separation and a lower recombination rate brought about with ideal zinc doping in the BFO lattice. Zn-doped BFO Methylene Blue 83 % after 3 hours of visible light irradiation [53] Y and Zn co-doped BiFeO 3 Methyl Orange 95 % degradation under 4 hours of visible light illumination [54] α-Bi 2 O 3 -ZnO AR-85 100 % in 40 min at pH 9 in visible light and KIO 4 oxidizers [55] Mesoporous TiO 2 À SiO 2 monoliths AR-85 100 % in 10 min at pH 2 in UV light and KBrO 3 oxidizers [56] Mn-doped BFO AR-85 99.7 % degradation in 50 min [57] Ni-doped BFO AR-85 99.67 % degradation in 40 min [58] Co-doped BFO AR-85 93.79 % degradation after a light exposure of 2 hours [59] Zn-doped BFO AR-85 92 % degradation after a light exposure of 2 hours Present Study…”

Synthesis and Characterization of Mesoporous Polymer-Silica Hybrid Monolith Using Conventional Sol-Gel Method for Enzyme Support

“…The volume of nitrogen gas adsorbed for the isotherms increased sharply, starting from 0.5 of relative pressure (p=p0) ( Figure 5(a)). This behavior might signify the capillary condensation of nitrogen gas within the continuous mesoporous structures [29,30]. Additionally, based on the BJH report for the porosity study (report not included), for the sample with 0.1g of PEG with 10,000 molecular weight (PEG-0.1-10K), the pore volume and size appeared to be 0.265 cm³/g and 2.797 nm, respectively while the same amount of PEG with 20,000 molecular weight ((PEG-0.1-20K) only gave a slightly different pore value of 0.264 cm³/g pore volume and 2.762 nm pore size.…”