12 research outputs found
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
Gamma Radiolysis Studies of Aqueous Solution of Brilliant Green Dye
The effect of γ–radiation on colour intensity of aqueous solution of Brilliant Green has been investigated at two different concentrations. The degradation of Brilliant Green (BG) has also been investigated in presence of suspended ZnO, by adding different amounts of ZnO. Simultaneously the conductance and pH of each solution system were measured before and after γ-irradiation. All the γ–irradiations were performed at a dose rate of 0.60 kGyhr-1 in GC-900. The maximum dose required for the complete degradation of the dye was found to be 0.39 kGy. G(-dye) values were found to decrease with increase in gamma dose and were in the range 4.26 - 12.81. The conductance (7.6 - 25.3 μS) and pH values increased marginally with dose for both the concentrations. The rate of decolouration was found to be high at lower doses and the efficiency of dye removal was higher at low concentration of the dye. This may be attributed to the presence of reaction by-products from the destruction of parent compound build up and compete for reaction intermediate species. The rate of reaction and rate constants were calculated and it was found that the degradation reaction follows first order kinetics. It was found that the decolouration percentage was more in dye systems in absence of ZnO
Rapid Color Test Identification System for Screening of Counterfeit Fluoroquinolone
The protocol of rapid identification system consists of three chemical color reactions; two group tests for fluoroquinolone class and a compound specific test each for norfloxacin, ciprofloxacin, gatifloxacin, ofloxacin, levofloxacin and sparfloxacin. The group color reactions are based on (a) Oxidizing behavior of quinolone and (b) Fluorine functional groups, both of which are characteristic of fluoroquinolone class. The compound specific color reactions are developed taking into consideration unique chemical behavior of each compound. The proposed chemical color tests have high selectivity⁄specificity, are ideal for screening purpose. The color of each test was defined by two standard color systems namely CIE lab and Munsell color. A suspected counterfeit tablet of any of the above mentioned drugs can be identified within 10-15 min using this rapid identification system
Efficient photocatalytic hydrogen generation by silica supported and platinum promoted titanium dioxide
Titanium dioxide was supported on mesoporous silica and promoted with Pt and Ru. The supported
photocatalysts show high surface area and better photocatalytic activity in visible light as compared to
the benchmark Degussa P25. These photocatalysts were characterized using XRD, BET-SA, and UV-DRS
techniques. The surface area of supported photocatalyst was 140.6 m2/g which is higher than Degussa P-
25. Supported photocatalyst was evaluated for hydrogen evolution via water splitting reaction using
ethanol as a sacrificial donor. Hydrogen yield observed is 4791.43 mmol/h/g of TiO2 and that for P-25 is
161 mmol/h/g of TiO2 under visible light irradiation. The value is 30 times higher than benchmark
material Degussa P-25. This photocatalyst is also found stable up to 24 h without replenishing with
sacrificial donor ethanol. However silica gel/TiO2/Ru does not show any exciting result for hydrogen
generation. The effect of various operating parameters like photocatalyst loading, Illumination time and
intensity of light on supported photocatalyst also has been studied
Rapid Color Test Identification System for Screening of Counterfeit Fluoroquinolone
Abstract: The protocol of rapid identification system consists of three chemical color reactions; two group tests for fluoroquinolone class and a compound specific test each for norfloxacin, ciprofloxacin, gatifloxacin, ofloxacin, levofloxacin and sparfloxacin. The group color reactions are based on (a) Oxidizing behavior of quinolone and (b) Fluorine functional groups, both of which are characteristic of fluoroquinolone class. The compound specific color reactions are developed taking into consideration unique chemical behavior of each compound. The proposed chemical color tests have high selectivity/specificity, are ideal for screening purpose. The color of each test was defined by two standard color systems namely CIE lab and Munsell color. A suspected counterfeit tablet of any of the above mentioned drugs can be identified within 10-15 min using this rapid identification system
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