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 Design and Synthesis of Metal Complexes of (2E)-2-[(2E)-3-Phenylprop-2-en-1-ylidene]hydrazinecarbothioamide and Their Photocatalytic Degradation of Methylene Blue

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
P. Murali Krishna ◽  
N. B. Gopal Reddy ◽  
Nagaraju Kottam ◽  
B. C. Yallur ◽  
Hussain Reddy Katreddi
Keyword(s):  
Methylene Blue ◽  
Catalytic Activity ◽  
Metal Complexes ◽  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Metal Ion ◽  
Uv Light ◽  
Cationic Dye ◽  
Design And Synthesis ◽  
Effects Of Ph

The photocatalytic degradation has been considered to be an efficient process for the degradation of organic pollutants, which are present in the effluents released by industries. The photocatalytic bleaching of cationic dye methylene blue was carried out spectrometrically on irradiation of UV light using Cu(II), Ni(II), and Co(II) complexes of (2E)-2-[(2E)-3-phenylprop-2-en-1-ylidene]hydrazinecarbothioamide (HL). The effects of pH and metal ion were studied on the efficiency of the reaction. Cu(II) complex shows better catalytic activity and the highest percentage degradation (~88.8%) of methylene blue was observed at pH 12. A tentative mechanism has also been proposed for the photocatalytic degradation of methylene blue.

scholarly journals Photocatalytic degradation of phenol red using complexes of some transition metals and hydrogen peroxide

2008 ◽  
Vol 73 (6) ◽  
pp. 631-639 ◽  
Author(s):  
Savitri Lodha ◽  
Dipti Vaya ◽  
Rakshit Ameta ◽  
Pinki Punjabi
Keyword(s):  
Hydrogen Peroxide ◽  
Transition Metals ◽  
Light Intensity ◽  
Photocatalytic Degradation ◽  
Phenol Red ◽  
Iron Copper ◽  
Thiocyanate Complexes ◽  
Ph Concentration

The photocatalytic degradation of Phenol Red was investigated using thiocyanate complexes of iron, copper, cobalt and hydrogen peroxide. The rate of photocatalytic degradation of the dye was followed spectrophotometrically. The effect of the variation of different parameters, such as pH, concentration of the complexes and dye, amount of H2O2 and light intensity on the rate of photocatalytic degradation was also studied. A tentative mechanism for the photocatalytic degradation of Phenol Red is proposed.

Photocatalytic degradation of parathion in aqueous TiO2 dispersion: the effect of hydrogen peroxide and light intensity

1998 ◽  
Vol 37 (8) ◽  
pp. 187-194 ◽  
Author(s):  
Tsu-feng Chen ◽  
Ruey-an Doong ◽  
Wen-gang Lei
Keyword(s):  
Hydrogen Peroxide ◽  
Light Intensity ◽  
Photocatalytic Degradation ◽  
Photocatalytic Oxidation ◽  
Pseudo First Order Reaction ◽  
Direct Photolysis ◽  
First Order ◽  
The Relationship ◽  
Effect Of Light ◽  
H2o2 System

The photodegradation of parathion in the direct photolysis, UV/TiO2, UV/H2O2 and UV/TiO2/H2O2 systems was investigated at 25°C. The effect of light intensity was also examined to clarify the relationship between the photo flux and decomposition rate of parathion. Results of the study demonstrated that no obvious degradation of parathion in dark reaction occurred within 24 hours. However, the addition of TiO2 and/or H2O2 promotes the degradation efficiency of parathion. Adding H2O2 was more effective in the photocatalytic oxidation of parathion than TiO2. Also, hydrogen peroxide was found as an intermediate with the maximum concentration of 55 μM in UV/TiO2 system during the photodegradation of parathion. A higher intensity of lamp could increase the degradation rate of parathion. However, the quantum efficiency for degradation of parathion decreased from 0.053 to 0.006 when light intensity increased from 100 W to 450W. Photodecomposition followed a pseudo-first-order reaction. The rate constants of parathion ranged from 0.003 min−1 for direct photolysis to 0.023 min−1 for UV/TiO2/H2O2 system. This study indicated that photocatalytic degradation is a highly promising technology for detoxifying parathion.

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 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.

scholarly journals A Study of the Photocatalytic Degradation of Acetaldehyde

2009 ◽  
Vol 5 (1) ◽  
pp. 598-602
Author(s):  
Suresh C. Ameta ◽  
Chetna Gomber
Keyword(s):  
Light Intensity ◽  
Photocatalytic Degradation ◽  
Cadmium Sulfide ◽  
Cadmium Sulphide ◽  
Effect Of Light ◽  
Ph Concentration

Photocatalytic degradation of acetaldehyde over cadmium sulfide, a semiconductor was investigated. The effect of various parameters, such as pH, concentration of acetaldehyde, amount of semiconductor, effect of light intensity were observed. A tentative mechanism has been proposed for the photocatalytic degradation of acetaldehyde using cadmium sulphide semiconductor.

Photocatalytic Degradation of Organic Pollutants by Using Nanocrystalline Boron‐doped TiO 2 Catalysts

2021 ◽  
Vol 6 (14) ◽  
pp. 3360-3369
Author(s):  
Rani P. Barkul ◽  
Radhakrishna S. Sutar ◽  
Meghshyam K. Patil ◽  
Sagar D. Delekar
Keyword(s):  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Boron Doped
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