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Graduate Center of the City University of New York
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724 J SCI IND RES VOL 68 AUGUST 2009 Journal of Scientific & Industrial Research Vol.... more 724 J SCI IND RES VOL 68 AUGUST 2009 Journal of Scientific & Industrial Research Vol. 68, August 2009, pp. 724-729 ... *Author for correspondence E-mail: brijeshpare@hotmail.com / pardeepchem@gmail.com ... Degradation and mineralization of victoria blue B dye in a ...
Desalination, 2008
A detailed investigation of photocatalytic degradation of the dye, acridine orange, has been carr... more A detailed investigation of photocatalytic degradation of the dye, acridine orange, has been carried out in aqueous heterogeneous medium containing ZnO as photocatalyst in a batch reactor. Visible light in the absence of ZnO has negligible effect on degradation. The disappearance of the dye, monitored spectrophotometrically, follows approximately pseudo-first order kinetics according to the Langmuir-Hinshelwood model. The total degradation of dye was tested using the chemical oxygen demand (COD) method. The addition of an optimal amount of hydrogen peroxide and potassium persulphate increases the degradation rate while NaCl and Na 2 CO 3 decreases. The effect of addition of cationic and anionic surfactants has also been investigated. Bubbling of nitrogen in the reaction solution decreases the reaction rate. ZnO has been found experimentally to be a highly efficient photocatalyst for the degradation of acridine orange dye and hence there is a great potential in the treatment of organic pollutants such as dyes.
The photocatalytic degradation of pararosanilin dye has been investigated under visible light in ... more The photocatalytic degradation of pararosanilin dye has been investigated under visible light in the presence of aqueous suspension of ZnO under different conditions. The reaction has been studied by monitoring the change in substrate concentration employing visible spectrophotometric analysis as a function of time. The absorbance of dye under investigation is found to decrease in the presence of ZnO and visible irradiation. The degradation of selected dye has been studied under different process variables such as reaction pH, catalyst loading, substrate concentration, light intensity and presence of electron acceptors, and hydroxyl radical scavengers. The rate degradation was strongly influenced by all the above-mentioned parameters. The estimated COD and CO 2 values of treated dye sample indicate complete degradation of dye. A slight decrease in pH and gradual increase in conductivity has also been observed during the degradation process. ZnO has been found to be potentially efficient in solar irradiation for the degradation of dye. Kinetic analysis indicates the complex nature of heterogeneous photocatalytic process.
724 J SCI IND RES VOL 68 AUGUST 2009 Journal of Scientific & Industrial Research Vol.... more 724 J SCI IND RES VOL 68 AUGUST 2009 Journal of Scientific & Industrial Research Vol. 68, August 2009, pp. 724-729 ... *Author for correspondence E-mail: brijeshpare@hotmail.com / pardeepchem@gmail.com ... Degradation and mineralization of victoria blue B dye in a ...
Desalination, 2008
A detailed investigation of photocatalytic degradation of the dye, acridine orange, has been carr... more A detailed investigation of photocatalytic degradation of the dye, acridine orange, has been carried out in aqueous heterogeneous medium containing ZnO as photocatalyst in a batch reactor. Visible light in the absence of ZnO has negligible effect on degradation. The disappearance of the dye, monitored spectrophotometrically, follows approximately pseudo-first order kinetics according to the Langmuir-Hinshelwood model. The total degradation of dye was tested using the chemical oxygen demand (COD) method. The addition of an optimal amount of hydrogen peroxide and potassium persulphate increases the degradation rate while NaCl and Na 2 CO 3 decreases. The effect of addition of cationic and anionic surfactants has also been investigated. Bubbling of nitrogen in the reaction solution decreases the reaction rate. ZnO has been found experimentally to be a highly efficient photocatalyst for the degradation of acridine orange dye and hence there is a great potential in the treatment of organic pollutants such as dyes.
The photocatalytic degradation of pararosanilin dye has been investigated under visible light in ... more The photocatalytic degradation of pararosanilin dye has been investigated under visible light in the presence of aqueous suspension of ZnO under different conditions. The reaction has been studied by monitoring the change in substrate concentration employing visible spectrophotometric analysis as a function of time. The absorbance of dye under investigation is found to decrease in the presence of ZnO and visible irradiation. The degradation of selected dye has been studied under different process variables such as reaction pH, catalyst loading, substrate concentration, light intensity and presence of electron acceptors, and hydroxyl radical scavengers. The rate degradation was strongly influenced by all the above-mentioned parameters. The estimated COD and CO 2 values of treated dye sample indicate complete degradation of dye. A slight decrease in pH and gradual increase in conductivity has also been observed during the degradation process. ZnO has been found to be potentially efficient in solar irradiation for the degradation of dye. Kinetic analysis indicates the complex nature of heterogeneous photocatalytic process.