Gamma Radiation Induced Formation of Iodine Monochloride in Iodine in Some Aromatic Chlorinated Solvents

Abstract: Gamma radiation induced formation of ICl in aerated and deaerated solutions of iodine in some aromatic chlorinated solvents has been studied for different concentrations and γ dosages. G values for formation of ICl and decomposition of I 2 were determined in gamma radiolysis of aerated and deaerated solutions of I 2 in 1,2-dichlorobenzene(1,2-DCB), 1,3-dichlorobenzene(1,3-DCB), 2-chlorotoluene, 3-chlorotoluene and benzotrichloride. G(ICl) values have been found to decrease in the following order 2-chlorotoluene < 3-chlorotoluene < 1,2-DCB < 1,3-DCB < benzotrichloride. G(ICl) is slightly higher in aerated solutions than in deaerated solutions and is found to be dependent on the structure of the parent organic molecule

SILICA GEL SUPPORTED TITANIUM DIOXIDE PHOTOCATALYST FOR METHYL ORANGE PHOTOREDUCTION

TiO2 based photocatalysis has been widely investigated and has vital applications in energy and environmental remediation processes. In this connection research is being conducted in the zone of supported TiO2 based photocatalysts for development of visible light induced photocatalytic material. A series of materials were synthesized including zeolite based composite photocatalyst, N-doped mesopourous titania and investigated for dye degradation followed by hydrogen generation. Current research trend is towards supported photocatalyst therefore silica gel supported TiO2 photocatalyst was designed and developed also compared with alumina based photocatalyst. From the experimental data it was found that Silica based system has edge over the other synthesized photocatalysts with effective dye degradation of about 9.61 mg of MO reduced per g of TiO2 (0.508 mg of MO reduced per g of TiO2 for Degussa P-25). MO photoreduction is 19 times higher as compared to benchmark material Degussa P-25. Results well illustrate the formation of high dispersed metal oxide on silica framework

Chlorophyll-based photocatalysts and their evaluations for methyl orange photoreduction

Immobilization of chlorophyll on different functionalized mesoporous materials has been attempted. The replacement of butanediol with monoethanol amine has resulted in increase in chlorophyll loading by a factor of two. The maximum immobilization of chlorophyll was on MCM-41 functionalized with monoethanolamine MCM-41/MEA/Chl) as compared to other mesoporous materials. This material has been characterized using XRD, UV–vis diffuse reflectance spectroscopy, scanning electron microscopy (SEM-EDX) and fluorescence spectroscopy. The photocatalytic reduction ofmethyl orange (MO)was studied using MCM-41/MEA/Chl as photocatalyst under the visible light. The photocatalytic reduction of MO was 0.396 mg/g of MCM-41/MEA/Chl photocatalyst as compared to 0.508 mg/g of TiO2 for that of Degussa P-25 photocatalyst. The effect of various operating parameters like catalyst loading, initial concentration and intensity of light has also been studied. Photocatalytic property of chlorophyll-based photocatalytic material indicates that chlorophyll acts as a reaction center, which absorbs visible light and generates electron, which is transferred to different electron acceptors reducing MO into derivative of hydrazine