Application of Bismuth‐Impregnated Mesoporous Silica to the Photochemical Oxidation of Methylene Blue: An Example of Nanoparticle Autocatalysis

Abstract

A range of Bi‐TUD‐1 silicas were used in conjunction with H2O2 to mediate the photochemical oxidation of methylene blue (MB). The rate of MB degradation increased sequentially with decreasing metal loading, and it was determined experimentally that singlet oxygen was responsible for the oxidation process observed. Kinetic studies of the system revealed that putative reactive BiV‐containing surface sites are generated autocatalytically by irradiation of the Bi‐TUD‐1 in the presence of peroxide. The formation of these active sites is favored by lower Bi concentrations resulting in the formation of smaller Bi species in the silica framework. Total organic carbon analysis of the reaction mixtures showed that MB was being converted to CO2 after the decolorization process had occurred.

In situ generation of hydroxyl radical by cobalt oxide supported porous carbon enhance removal of refractory organics in tannery dyeing wastewater

“…Gold impregnated with ferric oxide or titanium dioxide on activated carbon as heterogeneous pahse for the oxidation of bisphenol-A [12,13]. Au-Pd bimetallic nanoparticle impregnated on tubular mesoporous activated carbon was served as nano catalyst for the treatment of refractory organics in wastewater [14].…”

Synthesis and characterization of Co-NPAC and in situ hydroxyl radical generation for the oxidation of dye laden wastewater from the leather industry

“…Recently heterogeneous catalytic oxidation process has been reported to overcome the issues addressed in conventional homogeneous Fenton oxidation processes 9 . Gold was impregnated in ferric oxide, titanium dioxide or in activated carbon for the oxidative degradation of bisphenol-A 13,14 . Iron impregnated polyacrylamide (IIPA) powder catalyst was used as heterogeneous catalyst for the oxidation of organics in municipal wastewater with minimum sludge production of 20mg/gCOD destructed 11 .…”

“…12 Gold was impregnated in ferric oxide, titanium dioxide or activated carbon for the oxidative degradation of bisphenol-A. 13,14 Au-Pd bimetallic nanoparticle impregnated tubular mesoporous activated carbon was used as a highly dispersed nanocatalyst for the treatment of refractory organics in wastewater. 15 In an advanced oxidation process, an activated carbon supported cobalt catalyst removed phenol very efficiently using peroxymonosulphate as an oxidizing agent .…”

Silver(I) Catalyzed Photochemical Oxidation of Methylene Blue and Safranine-O by Peroxydisulphate: A Green Chemical Approach

“…Ward et al [23] have studied a range of Bi-TUD-1 silicas in conjunction with H 2 O 2 to mediate the photochemical oxidation of methylene blue whereas El-Kemary et al [24] have carried out comparative study for photodegradation of safranine-O using nanoparticles TiO 2 and Ag-TiO 2 . Ember et al [25] have developed new routes for clean oxidation of nonbiodegradable organic dyes.…”