Preparation Nano-Sized ZnO/Ag Particles and Photocatalytic Degradation of UDMH Wastewater

2014 ◽  
Vol 1015 ◽  
pp. 442-446 ◽  
Author(s):  
Ying Jia ◽  
Ya Nan He ◽  
Feng Hao Liang ◽  
Mei Yuan ◽  
Tian Tian Liu
Keyword(s):  
Waste Water ◽  
Quantum Yield ◽  
Photocatalytic Degradation ◽  
Crystallite Size ◽  
Hydrothermal Method ◽  
Light Sources ◽  
Photocatalytic Process ◽  
Spectral Absorption ◽  
Degradation Rates ◽  
Ag Particles

Different morphologies of nanoZnO have been synthesized by hydrothermal method and ethanol-assisted hydrothermal method, the quantum yield has been improved by noble metal doping, and also the range of spectral absorption has been widened. Then the products are used in the photocatalytic process of UDMH waste water. It is found that the crystallite size of the products is about 41~46nm, the maximum degradation rates of ZnO/Ag are 92.7% under the ultraviolet light, and 80.2% under the sunlight. The variation of the photocatalytic middle-product under different light sources is analyzed and it is found that the middle-product is decomposed more quickly and throughly under sunlight.

Performance of Bi20TiO32 for Photocatalytic Degradation of Organic Pollutants in Water

2011 ◽  
Vol 233-235 ◽  
pp. 724-727
Author(s):  
Xu Hui Sun ◽  
Guo Hua Zhang ◽  
Lin Sun ◽  
Jun Ma
Keyword(s):  
Waste Water ◽  
Methyl Orange ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Surface Charge ◽  
Organic Pollutants ◽  
Light Wavelength ◽  
Photocatalytic Process ◽  
Optimum Ph ◽  
Light Activity

The factors that influence the performance of Bi20TiO32were discussed, and the removal of TOC in the analogue waste water was also examined. The shorter the light wavelength or the more the intensity, the more efficient the photocatalytic process. Different substance has different optimum pH for being photodegraded by photocatalyst Bi20TiO32, which may be related with its surface charge. Aeration have little benefit for decomposing the organics. Some organics like methyl orange and phenol can be photodegraded by Bi20TiO32completely. Bi20TiO32has visible-light activity for the degradation of organics.

The Effect of Different Ions on Photodegradation Rhodamine B in TiO2 Suspension Liquid

2013 ◽  
Vol 807-809 ◽  
pp. 2739-2742
Author(s):  
Peng Wei Huo ◽  
Mao Bin Wei ◽  
Xin Lin Liu ◽  
Dan Dan Wang ◽  
Zi Yang Lu ◽  
...  
Keyword(s):  
Waste Water ◽  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Degradation Rate ◽  
Ph Value ◽  
Degradation Process ◽  
Photocatalytic Process ◽  
Negative Effect ◽  
Anions And Cations

The photocatalytic degradation process of waste water was usually influenced by many factors, such as different ions, addition reagent and pH value. In order to investigate the effect of ions strength in the photocatalytic process, the anions and cations were systematically investigated with P25 TiO2 photocatalyst with Rhodamine B (RB) as waste water in this work. The results showed that the cations of low valence showed minimum negative effect on degradation rate and the most anions showed enhance the degradation rate of RB. The ions strength showed random in the photocatalytic process.

Photocatalytic Degradation of Eriochrome Black Dye in a Rotating Corrugated Drum Photocatalytic Reactor

2010 ◽  
Vol 8 (1) ◽  
Author(s):  
Nathalie Ho ◽  
Joanne D Gamage ◽  
Zisheng Jason Zhang
Keyword(s):  
Photocatalytic Degradation ◽  
Kinetic Analysis ◽  
Azo Dye ◽  
Advanced Oxidation Processes ◽  
Catalyst Deactivation ◽  
Reaction Intermediates ◽  
Photocatalytic Process ◽  
Photocatalytic Reactor ◽  
Oxidation Processes ◽  
Degradation Rates

Advanced oxidation processes have been investigated as a viable means of treatment for the degradation and removal of dye-containing effluents. In this work, the degradation of an azo dye, Eriochrome black, was studied using a novel photocatalytic reactor in which TiO2 is immobilized on a rotating corrugated drum. The degradation of the dye via the photocatalytic method was confirmed, and degradation rates were compared using different drum designs. Catalyst deactivation was observed, and this process of irreversibility was found to increase with increasing initial dye concentration in the water. A Langmuir-Hinshelwood kinetic analysis was applied, and it was found to agree well with the data in the initial parts of the reaction but diverged with increasing time. The discrepancy was thought to be due to the presence of unquantified reaction intermediates which may only be broken down slowly by the photocatalytic process.

Photocatalytic Purification of Wastewater Polluted by Odorant Sulfur Compounds Using Titanium Oxide in a Continuous Photoreactor

2013 ◽  
Vol 11 (1) ◽  
pp. 561-567 ◽  
Author(s):  
Mohammad Reza Toosi ◽  
Mohamad Hasan Peyravi ◽  
Jafar Sajadi ◽  
Mohamad J. Bayani ◽  
Hadi Manghabati
Keyword(s):  
Waste Water ◽  
Titanium Dioxide ◽  
Photocatalytic Degradation ◽  
Titanium Oxide ◽  
Efficient Method ◽  
Ex Situ ◽  
Photocatalytic Decomposition ◽  
Methyl Ethyl ◽  
Photocatalytic Process ◽  
Initial Concentration

Abstract Using titanium dioxide, photocatalytic degradation of waste water polluted by commercial mercaptans (80% t-butyl mercaptan and 20% methyl ethyl sulfide) was investigated in a continuous photoreactor in the presence of UV irradiation. The reaction was performed at different pH of solution, intensity of irradiation, and initial concentration of odorant. Kinetics and mechanism of photocatalytic decomposition of mercaptans were studied by ex situ FTIR measurements of intermediates. The results showed that the photocatalytic process for degradation of mercaptans was an efficient method for mineralization of sulfur odorants in waste water. A proposed mechanism of mineralization of mercaptan was presented based on the results.

scholarly journals Photocatalytic Degradation of Sulfolane Using a LED-Based Photocatalytic Treatment System

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 624
Author(s):  
Sripriya Dharwadkar ◽  
Linlong Yu ◽  
Gopal Achari
Keyword(s):  
Photocatalytic Degradation ◽  
Oil And Gas ◽  
Light Emitting Diode ◽  
Tap Water ◽  
Aqueous Media ◽  
Ultrapure Water ◽  
Light Emitting ◽  
Degradation Rates ◽  
Reduced Graphene ◽  
The Impact

Sulfolane is an emerging industrial pollutant detected in the environments near many oil and gas plants in North America. So far, numerous advanced oxidation processes have been investigated to treat sulfolane in aqueous media. However, there is only a few papers that discuss the degradation of sulfolane using photocatalysis. In this study, photocatalytic degradation of sulfolane using titanium dioxide (TiO2) and reduced graphene oxide TiO2 composite (RGO-TiO2) in a light-emitting diode (LED) photoreactor was investigated. The impact of different waters (ultrapure water, tap water, and groundwater) and type of irradiation (UVA-LED and mercury lamp) on photocatalytic degradation of sulfolane were also studied. In addition, a reusability test was conducted for the photocatalyst to examine the degradation of sulfolane in three consecutive cycles with new batches of sulfolane-contaminated water. The results show that LED-based photocatalysis was effective in degrading sulfolane in waters even after three photocatalytic cycles. UVA-LEDs displayed more efficient use of photon energy when compared with the mercury lamps as they have a narrow emission spectrum coinciding with the absorption of TiO2. The combination of UVA-LED and TiO2 yielded better performance than UVA-LED and RGO-TiO2 for the degradation of sulfolane. Much lower sulfolane degradation rates were observed in tap water and groundwater than ultrapure water.

Binary MOF of iron and copper for treating ciprofloxacin contaminated waste water by integrated technique of adsorption and photocatalytic degradation

2021 ◽  
Author(s):  
Aditi Chatterjee ◽  
Amiya K Jana ◽  
Jayanta Kumar Basu
Keyword(s):  
Waste Water ◽  
Water Pollution ◽  
Photocatalytic Degradation ◽  
Metal Organic Framework ◽  
Single Step ◽  
New Approach ◽  
Metal Organic ◽  
Integrated Technique ◽  
Contaminated Waste ◽  
Control Water

Adsorption assisted photocatalysis is a new approach to control water pollution. A novel metal organic framework MIL 53(Fe-Cu) was formulated by a single step solvothermal route. The newly developed MOF...

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