scholarly journals Photocatalytic degradation of rose Bengal by semiconducting zinc sulphide used as a photocatalyst

2013 ◽  
Vol 78 (6) ◽  
pp. 897-905 ◽  
Author(s):  
Shweta Sharma ◽  
Rakshit Ameta ◽  
R.K. Malkani ◽  
Suresh Ameta
Keyword(s):  
Light Intensity ◽  
Aqueous Solutions ◽  
Photocatalytic Degradation ◽  
Hydroxyl Radicals ◽  
Rose Bengal ◽  
Zinc Sulphide ◽  
Rate Of Reaction ◽  
Rose Bengal Dye ◽  
Ph Concentration

Various semiconductors have been used as photocatalysts for removal of different dyes from their aqueous solutions. Zinc sulphide semiconductor is used in the present investigation as a photocatalyst for the removal of rose Bengal dye. Effect of different parameters, which affect the rate of reaction; like pH, concentration of dye, amount of semiconductor and light intensity have been studied. A mechanism has also been proposed in which hydroxyl radicals are shown as an active oxidizing species.

Effect of KCl Addition upon the Photocatalytic Activity of Zinc Sulphide

2011 ◽  
Vol 318 ◽  
pp. 1-10
Author(s):  
Dipti Vaya ◽  
Abhilasha Jain ◽  
Savitri Lodha ◽  
V. K. Sharma ◽  
Suresh C. Ameta
Keyword(s):  
Photocatalytic Activity ◽  
Light Intensity ◽  
Zinc Sulphide ◽  
Molar Ratio ◽  
Eosin Y ◽  
Molar Ratios ◽  
Ph Concentration

In the present investigation the photocatalytic activity of zinc sulphide has been enhanced using KCl in different molar ratios. The progress of the reaction was monitored spectrophotometrically. The effect of various parameters like pH, concentration of dye, amount of semiconductor, light intensity etc. upon the rate of photocatalytic bleaching of eosin Y has been observed. The molar ratio of KCl: ZnS = 0.25 was found to be a most efficient mixture for bleaching of eosin Y. A tentative mechanism for the photocatalytic bleaching of the dye has also been proposed.

scholarly journals Use of semi-conducting bismuth sulfide as a photocatalyst for degradation of rose bengal

2011 ◽  
Vol 30 (2) ◽  
pp. 229 ◽  
Author(s):  
Shweta Sharma ◽  
Rakshit Ameta ◽  
R. K. Malkani ◽  
Suresh C. Ameta
Keyword(s):  
Light Intensity ◽  
Rose Bengal ◽  
Bismuth Sulfide ◽  
Optimum Conditions ◽  
First Order ◽  
First Order Kinetics ◽  
Degradation Of Dyes ◽  
Textile Dyeing ◽  
Rate Of Reaction ◽  
Pseudo First Order

Different methods have been adopted for the removal and degradation of dyes from effluents of textile, dyeing and printing industries. These methods have their own merits and drawbacks. In the present investigation, bismuth sulfide has been used as a photocatalyst for the degradation of rose Bengal. The effect of different parameters like the pH, concentration of dye solution, amount of semiconductor and light intensity on the rate of reaction has been investigated. The reaction follows pseudo-first order kinetics. The optimum conditions were obtained as: [rose Bengal] = 1.60·10–5 M; Bi2S3 = 0.10 g; pH = 8.5, and light intensity = 50.0 mW·cm–2. The rate constant was 4.68·10–5 sec–1. A mechanism has been proposed for the degradation of rose Bengal involving hydroxyl radicals.

Kinetics of ozone reactions with 1-naphthalene, 1,5-naphthalene and 3-nitrobenzene sulphonic acids in aqueous solutions

2001 ◽  
Vol 44 (5) ◽  
pp. 7-13 ◽  
Author(s):  
V. Calderara ◽  
M. Jekel ◽  
C. Zaror
Keyword(s):  
Aqueous Solutions ◽  
Hydroxyl Radicals ◽  
Oxidation Kinetics ◽  
Order Kinetic ◽  
Rate Of Reaction ◽  
Direct Reactions ◽  
Kinetics Of ◽  
By Products ◽  
Ozone Reactions ◽  
Primary Oxidation

This paper describes the ozone oxidation kinetics of 1-naphthalene (1NS), 1,5-naphthalene (1,5NDS), and 3-nitrobenzene (3NBS) sulphonic acid. The presence of hydroxyl radicals and their effect on the overall rate of reaction was studied. Second order kinetic constants of direct reactions were estimated at around 252 M-1s-1, 41 M-1s-1 and 22 M-1s-1, for 1NS, 1,5NDS, and 3NBS sulphonic acids, respectively. At pH 3, the indirect reaction accounted for 2%, 15% and 4% of total primary oxidation of 1NS, 1,5NBS, and 3NBS sulphonic acids, respectively. At pH 9, indirect reaction contribution increased to 73%, 84% and 48%, respectively. C4 compounds (maleic and fumaric acids), C2 (oxalic), C1 (formic) and sulphate were identified as oxidation by-products in all cases. TOC slowly decreased throughout ozonation, reaching around 40-60% and 60-70% reduction over 90 minutes at pH 7 and 3, respectively.

scholarly journals PHOTOCATALYTIC DEGRADATION OF RHODAMIN-B USING METAL COMPLEXES AND HYDROGEN PEROXIDE

2010 ◽  
Vol 8 (1) ◽  
pp. 42-46 ◽  
Author(s):  
Savitri Lodha ◽  
Abhilasha Jain ◽  
Mukesh Paliwal ◽  
Pinki B. Punjabi
Keyword(s):  
Hydrogen Peroxide ◽  
Light Intensity ◽  
Metal Complexes ◽  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Cationic Dye ◽  
Efficient Process ◽  
Operating Variables ◽  
Rhodamin B ◽  
Ph Concentration

The photocatalytic degradation has been considered to be an efficient process for degradation of organic pollutants, which are present in the effluents released by industries. The photocatalytic bleaching was carried out on rhodamin-B (cationic dye) in the presence of iron (III) complex, hydrogen peroxide and was observed spectrophotometrically. The effect of various operating variables like pH, concentration of complex and dye, amount of H2O2 and light intensity etc. was also observed on the efficiency of the reaction. A tentative mechanism has also been proposed for this photocatalytic degradation of rhodamin-B.   Keywords: Photocatalytic degradation, rhodamin-B, metal complexes, hydrogen peroxide

scholarly journals Photocatalytic Degradation of Malachite Green using Undoped and Carbon-Doped Calcium Molybdate Catalysts

2021 ◽  
Vol 7 (1) ◽  
pp. 725-728
Author(s):  
Chawda Hardeep Shre ◽  
Bhatt J. ◽  
Rathore R. ◽  
Ameta Suresh C. ◽  
Ameta R.
Keyword(s):  
Light Intensity ◽  
Hydroxyl Radical ◽  
Photocatalytic Degradation ◽  
Malachite Green ◽  
Carbon Doped ◽  
Calcium Molybdate ◽  
Ph Concentration

Calcium molybdates (undoped and carbon-doped) have been used as a photocatalyst for the degradation of malachite green. These have been characterized by different techniques such as FE-SEM, EDX and XRD. The progress of the reaction has been monitored spectrophotometrically. Different rate affecting parameters like pH, concentration of dye, amount of semiconductor and light intensity have been studied and their optimum values obtained are pH 9.7, concentration of malachite green as 5.00 × 10-4 M, 0.12 g of CaMoO4 and light intensity as 50.0 mWcm–2. A tentative mechanism for the photocatalytic degradation of dye has been proposed, where hydroxyl radical has been observed as an active oxidizing species.

scholarly journals An overview report on the application of heteropoly acids on supporting materials in the photocatalytic degradation of organic pollutants from aqueous solutions

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5501 ◽  
Author(s):  
Ali Nikoonahad ◽  
Babak Djahed ◽  
Samira Norzaee ◽  
Hadi Eslami ◽  
Zahra Derakhshan ◽  
...  
Keyword(s):  
Water Resources ◽  
Aqueous Solutions ◽  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Hydroxyl Radicals ◽  
Organic Pollutant ◽  
Environmental Hazards ◽  
Heteropoly Acids ◽  
Untreated Wastewater ◽  
Supporting Materials

Organic pollutants contaminate water resources and the environment when discharged into water streams. Also, the presence of these materials in incompletely treated or untreated wastewater leads to serious environmental hazards. The hydroxyl radicals and holes are regarded as the most oxidant species in the degradation of organic pollutants using the studied composites. The results of this review show that heteropoly acids on supporting materials could be considered as appropriate photocatalysts in the removal of organic pollutant from aqueous solutions.

Highly active spherical amorphous MoS2: facile synthesis and application in photocatalytic degradation of rose bengal dye and hydrogenation of nitroarenes

RSC Advances ◽  
2015 ◽  
Vol 5 (108) ◽  
pp. 88848-88856 ◽  
Author(s):  
Namrata Saha ◽  
Arpita Sarkar ◽  
Abhisek Brata Ghosh ◽  
Amit Kumar Dutta ◽  
Gopala Ram Bhadu ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Rose Bengal ◽  
Facile Synthesis ◽  
Solvothermal Route ◽  
Highly Active ◽  
Amino Compounds ◽  
Rose Bengal Dye

The amorphous MoS2 was derived from the MoO2(acda)2 complex via a solvothermal route and this as-synthesized particles has been found to catalyze reduction of nitroarenes to corresponding amino compounds in presence of NaBH4.

Sign in / Sign up

Export Citation Format

Share Document