scholarly journals Removal of polyaromatics from textile industry using La /ZnO nanocomposite

2021 ◽  
Vol 4 (2) ◽  
Keyword(s):  
Textile Industry ◽  
Photocatalytic Oxidation ◽  
Uv Light ◽  
Diphenyl Ether ◽  
Mass Ratio ◽  
Operational Conditions ◽  
Treatment Processes ◽  
Doped Zno ◽  
Optimized Conditions ◽  
Industry Wastewater

The effects of the type and amount of loadings on the photocatalytic activity of Ln/ ZnO were studied and the results were compared with pure ZnO. The textile wastewaters (TW) could not be treated effectively with concentional treatment processes due to high polyphenols and colour content. In this study, La/ZnO nanocomposite was used for the photocatalytic oxidation of pollutant parameters [COD components (CODtotal, CODdissolved, CODinert), polyaromatic amines and color] from the textile effluent wastewaters (TW) at different operational conditions such as, at increasing photooxidation times (5 min, 15 min, 30 min, 60 min, 80 min and 100 min), at diferent La mass ratios (0.5wt% , 1wt%, 1.5wt%, 2wt%), at different La-ZnO photocatalyst concentrations (1, 5, 15, 30 and 45 mg/L), under 10, 30, 50 and 100 W ultraviolet (UV) irradiations, respectively. The maximum CODtotal, CODinert, total aromatic amines (TAAs) and color photooxidation yields were 99%, 92%, 98% and 99% respectively, under the optimized conditions, at 30 mg/L La/ZnO nanocomposite with a La mass ratio of 1.5 wt% under 50 W UV light, after 60 min photooxidation time, at 25oC. The photooxidation yields of 2-methoxy-5-methylaniline (MMA), 2,4-diaminoanisole(DAA); 4,40-diamino diphenyl ether (DDE), o-aminoazotoluene (OAAT), and 4-aminoazobenzol (AAB) polyaromatic amines were > 82%. The pollutants of textile industry wastewater were effectively degraded with lanthanum doped ZnO nanocomposite.

scholarly journals Photodegradation of Polyphenols and Aromatic Amines in Olive Mill Effluents with Ni Doped C/TiO2

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Delia Teresa Sponza ◽  
Rukiye Oztekin
Keyword(s):  
Aromatic Amines ◽  
Uv Light ◽  
Sunlight Irradiation ◽  
Operational Conditions ◽  
Ph Values ◽  
Olive Mill Wastewaters ◽  
C 50 ◽  
Optimized Conditions ◽  
Coated Carbon ◽  
Olive Mill

Magnetic nickel coated carbon based titanium dioxide [C/TiO2/Ni] nanocomposites were used for photodegradation of polyphenols and total aromatic amines (TAAs) metabolites from olive mill wastewaters (OMW) at different operational conditions such as different mass ratios of C, TiO2, and Ni (1%/2%/5%; 5%/1%/2%; and 2%/5%/1%), being at increasing photodegradation times (15, 30, 45, 60, 75, 120, and 180 min), photocatalyst concentrations (100, 250, 500, and 1000 mg L−1), pH values (3.5, 4.0, 7.0, and 10.0) and temperatures (15°C, 25°C, 50°C, and 80°C), and being under 300 W ultraviolet (UV) and 30 W sunlight irradiation. Under the optimized conditions, atpH=7.0, at 500 mg L−1C/TiO2/Ni nanocomposite, under 300 W UV light, after 60 min, at 25°C, the maximum CODdissolved, total phenol, and TAAs removals were 99%, 90%, and 96%, respectively. Photodegradation removals in the OMW under sunlight and being lower than those under UV light.

scholarly journals Characteristics of textile waste water of Bhilwara (Rajasthan) and its photocatalytic bleaching with SnO2 catalyst

2020 ◽  
Vol 11 (1) ◽  
pp. 13-18
Author(s):  
Kamod Singh Meena ◽  
Kanta Meena
Keyword(s):  
Waste Water ◽  
Metal Complexes ◽  
Organic Compounds ◽  
Textile Industry ◽  
Conventional Treatment ◽  
Uv Light ◽  
Quality Parameters ◽  
Textile Waste ◽  
Treatment Processes ◽  
Textile Waste Water

During the last decade, Bhilwara has developed into a leading place in the textile industry in India. The water used in textile industry is almost entirely discharged as waste. The effluents are very complex, containing salt, surfactants, ionic metals and their metal complexes, toxic organic chemicals, biocides, and toxic anions, which are harmful to both flora and fauna existing on our planet. Degradation of these non-biodegradable organic compounds is not possible by conventional treatment processes. The analysis of waste water with different quality parameters and photocatalytic bleaching was examined by using UV light in photochemical reactor with SnO2 catalyst.

scholarly journals HYDROGEN-PLASMA-TREATED NANO TIO2 FOR PHOTOCATALYTIC OXIDATION OF VOCS IN AIR STREAM

2019 ◽  
Vol 57 (3A) ◽  
pp. 54
Author(s):  
Le Nguyen Quang Tu ◽  
Nguyen Van Dung ◽  
Pham Trung Kien ◽  
Ca Quoc Vuong ◽  
Nguyen Quoc Thiet ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Oxidation ◽  
Uv Light ◽  
Hydrogen Plasma ◽  
Similar Reaction ◽  
X Ray Diffraction ◽  
Treatment Processes ◽  
Air Stream ◽  
Treated Sample ◽  
Plasma Treated Sample

Unlike water treatment processes, the photocatalytic oxidation of VOCs in air stream exhibits many challenges. This study will develop the hydrogen-plasma-treated TiO2 with improvement in photocatalytic activity. The hydrogen-plasma-treatment was carried out in the non-thermal atmospheric pressure reactor at room temperature or above. The catalysts were prepared and analyzed by advanced techniques such as X-ray diffraction (XRD), scanning electro-microscopy (SEM) and transmission electro-microscopy (TEM). The photocatalytic activity of the catalyst has been investigated under UV light with various reaction conditions such as different initial toluene/formaldehyde concentrations and water content. Significantly, the conversion of toluene by a plasma-treated sample was 1.5 times higher than the bare TiO2 in a similar reaction condition.

Decolorization and mineralization of Diarylide Yellow 12 (PY12) by photo-Fenton process: the Response Surface Methodology as the optimization tool

2012 ◽  
Vol 65 (10) ◽  
pp. 1795-1800 ◽  
Author(s):  
Edison GilPavas ◽  
Izabela Dobrosz-Gómez ◽  
Miguel Ángel Gómez-García
Keyword(s):  
Response Surface Methodology ◽  
Experimental Design ◽  
Response Surface ◽  
Textile Industry ◽  
Fenton Process ◽  
Photo Degradation ◽  
Operational Conditions ◽  
Response Optimization ◽  
Wavelength Radiation ◽  
Optimized Conditions

The Response Surface Methodology (RSM) was applied as a tool for the optimization of the operational conditions of the photo-degradation of highly concentrated PY12 wastewater, resulting from a textile industry located in the suburbs of Medellin (Colombia). The Box-Behnken experimental Design (BBD) was chosen for the purpose of response optimization. The photo-Fenton process was carried out in a laboratory-scale batch photo-reactor. A multifactorial experimental design was proposed, including the following variables: the initial dyestuff concentration, the H2O2 and the Fe+2 concentrations, as well as the UV wavelength radiation. The photo-Fenton process performed at the optimized conditions resulted in ca. 100% of dyestuff decolorization, 92% of COD and 82% of TOC degradation. A kinetic study was accomplished, including the identification of some intermediate compounds generated during the oxidation process. The water biodegradability reached a final DBO5/DQO = 0.86 value.

scholarly journals Ecotoxicological and health concerns of persistent coloring pollutants of textile industry wastewater and treatment approaches for environmental safety

2021 ◽  
pp. 105012
Author(s):  
Roop Kishor ◽  
Diane Purchase ◽  
Ganesh Dattatraya Saratale ◽  
Rijuta Ganesh Saratale ◽  
Luiz Fernando R. Ferreira ◽  
...  
Keyword(s):  
Textile Industry ◽  
Environmental Safety ◽  
Treatment Approaches ◽  
Health Concerns ◽  
Industry Wastewater

Photocatalytic Activity of Fe-Doped ZnO/Montmorillonite Nanocomposite for Degradation of Malachite Green

2015 ◽  
Vol 827 ◽  
pp. 19-24 ◽  
Author(s):  
Nur Afifah ◽  
Nadia Febiana Djaja ◽  
Rosari Saleh
Keyword(s):  
Photocatalytic Activity ◽  
Malachite Green ◽  
Organic Dyes ◽  
Uv Light ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spin Resonance ◽  
Doped Zno ◽  
Co Precipitation

In this study, the photocatalytic activity of pure Fe- doped ZnO and Fe- doped ZnO/Montmorillonite nanocomposite has been investigated for the degradation of malachite green under UV light irradiation. Both photocatalysts were synthesized using co-precipitation method and characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, Fourier-transform infrared absorption, and electron spin resonance. The results showed that the photocatalytic efficiency is better in the presence of montmorillonite compared to pure Fe- doped ZnO. To detect the possible reactive species involved in degradation of organic dyes control experiments with introducing scavengers into the solution of organic dyes were carried out. It is found that electron plays an important role in the degradation of malachite green.

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