scholarly journals Study on photocatalytic degradation of pharmaceutical wastewater by heteropoly acid silver photocatalytic oxidation

2019 ◽  
Vol 252 ◽  
pp. 022063
Author(s):  
Changwei An ◽  
Danfeng Zhang ◽  
Tong Liu ◽  
Jingsen Yan ◽  
E Yongsheng ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Photocatalytic Oxidation ◽  
Heteropoly Acid ◽  
Pharmaceutical Wastewater

Study on Eu Doped ZnO Photocatalytic Degradation of Pharmaceutical Wastewater

2014 ◽  
Vol 700 ◽  
pp. 482-486 ◽  
Author(s):  
Li Chen Luo ◽  
Lei Zhu ◽  
Xun Wang
Keyword(s):  
Zinc Oxide ◽  
Photocatalytic Degradation ◽  
Photocatalytic Oxidation ◽  
Optimal Conditions ◽  
Pharmaceutical Wastewater ◽  
Hydrothermal Temperature ◽  
Prepared Powder ◽  
Oxidation Effect ◽  
Doping Ratio

In this paper,europium doped zinc oxide nanoparticles were prepared by Zn (CH3COO)2, Eu (NO3)5·6H20,NaOH,PEG2000 and Citric acid using hydrothermal method. The prepared powder was used for photocatalytic degradation, in which the influence ofreaction temperature, reaction time, illumination conditions as well as the doping ratio on the effect of photocatalytic oxidation were throughly investigated. Analytical methods, such as XRD, SEM and EDS were utilized in this study for characterization of the prepared powder. Results showed that Europium-doped zinc oxide with a 3% doping ratio reached optimal photocatalytic oxidation effect when the hydrothermal temperature was 160°C and hydrothermal time was 6 hours. By utilizing the prepared powder under optimal conditions, the decolorization rate of pharmaceutical wastewater reached 38.8% after treatment of 365nm UV irraditation for 150min, and the degradation rate of COD reached 57.5%.

scholarly journals Heterogeneous Photo-Fenton Catalytic Degradation of Practical Pharmaceutical Wastewater by Modified Attapulgite Supported Multi-Metal Oxides

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 156
Author(s):  
Manjing Lu ◽  
Jiaqi Wang ◽  
Yuzhong Wang ◽  
Zhengguang He
Keyword(s):  
Photocatalytic Oxidation ◽  
Removal Rate ◽  
Catalytic Degradation ◽  
Gas Chromatography Mass Spectrometry ◽  
Pharmaceutical Wastewater ◽  
High Concentration ◽  
Modified Attapulgite ◽  
Cod Removal Rate ◽  
Pre Treatment ◽  
Almost All

Chemical synthetic pharmaceutical wastewater has characteristics of high concentration, high toxicity and poor biodegradability, so it is difficult to directly biodegrade. We used acid modified attapulgite (ATP) supported Fe-Mn-Cu polymetallic oxide as catalyst for multi-phase Fenton-like ultraviolet photocatalytic oxidation (photo-Fenton) treatment with actual chemical synthetic pharmaceutical wastewater as the treatment object. The results showed that at the initial pH of 2.0, light distance of 20 cm, and catalyst dosage and hydrogen peroxide concentration of 10.0 g/L and 0.5 mol/L respectively, the COD removal rate of wastewater reached 65% and BOD5/COD increased to 0.387 when the reaction lasted for 180 min. The results of gas chromatography-mass spectrometry (GC-MS) indicated that Fenton-like reaction with Fe-Mn-Cu@ATP had good catalytic potential and significant synergistic effect, and could remove almost all heterocycle compounds well. 3D-EEM (3D electron microscope) fluorescence spectra showed that the fluorescence intensity decreased significantly during catalytic degradation, and the UV humus-like and fulvic acid were effectively removed. The degradation efficiency of the nanocomposite only decreased by 5.8% after repeated use for 6 cycles. It seems appropriate to use this process as a pre-treatment for actual pharmaceutical wastewater to facilitate further biological treatment.

Gallic acid magnetic nanoparticles for photocatalytic degradation of meloxicam: synthesis, characterization and application to pharmaceutical wastewater treatment

RSC Advances ◽  
2015 ◽  
Vol 5 (127) ◽  
pp. 104981-104990 ◽  
Author(s):  
Ahmed H. Nadim ◽  
Medhat A. Al-Ghobashy ◽  
Marianne Nebsen ◽  
Mostafa A. Shehata
Keyword(s):  
Wastewater Treatment ◽  
Magnetic Nanoparticles ◽  
Photocatalytic Degradation ◽  
Gallic Acid ◽  
Pharmaceutical Wastewater

Gallic acid magnetic nanoparticles for photocatalytic degradation of meloxicam in pharmaceutical wastewater.

Treatment of pharmaceutical wastewater by combination of electrocoagulation, electro-fenton and photocatalytic oxidation processes

2020 ◽  
Vol 8 (3) ◽  
pp. 103777 ◽  
Author(s):  
Gizem Başaran Dindaş ◽  
Yasemin Çalışkan ◽  
Emin Ender Çelebi ◽  
Mesut Tekbaş ◽  
Nihal Bektaş ◽  
...  
Keyword(s):  
Photocatalytic Oxidation ◽  
Pharmaceutical Wastewater ◽  
Oxidation Processes

Use of Experimental Designs to Establish a Kinetic Law for a Gas Phase Photocatalytic Process

2014 ◽  
Vol 12 (1) ◽  
pp. 113-122 ◽  
Author(s):  
Cécile Raillard ◽  
Audrey Maudhuit ◽  
Valérie Héquet ◽  
Laurence Le Coq ◽  
Jean Sablayrolles ◽  
...  
Keyword(s):  
Light Intensity ◽  
Photocatalytic Degradation ◽  
Gas Phase ◽  
Photocatalytic Oxidation ◽  
Experimental Designs ◽  
Photocatalytic Process ◽  
Air Velocity ◽  
Kinetic Rate ◽  
Initial Concentration ◽  
Designs Of Experiments

Abstract The photocatalytic degradation of three common indoor VOCs – acetone, toluene and heptane – is investigated in a dynamic photocatalytic oxidation loop using Box–Behnken designs of experiments. Thanks to the experimental results and the establishment of a kinetic rate law based on a simplified mechanism, a predictive model for the VOC degradation involving independent factors is developed. The parameters under investigation are initial concentration, light intensity and air velocity through the photocatalytic medium. The obtained model fits properly the experimental curves in the range of concentration, light intensity and air flow studied.

scholarly journals Photocatalytic oxidation of attapulgite supported titanate heteropoly acid salt

2019 ◽  
Vol 252 ◽  
pp. 022062
Author(s):  
Changwei An ◽  
Danfeng Zhang ◽  
Tong Liu ◽  
Jingsen Yan ◽  
E Yongsheng ◽  
...  
Keyword(s):  
Photocatalytic Oxidation ◽  
Heteropoly Acid ◽  
Acid Salt

Anaerobic Photocatalytic Oxidation of Carbohydrates in Aqueous Pt/TiO2 Suspensions with Simultaneous Production of Hydrogen

2010 ◽  
Vol 13 (1) ◽  
Author(s):  
Dimitris I. Kondarides ◽  
Alexia Patsoura ◽  
Xenophon E. Verykios
Keyword(s):  
Photocatalytic Degradation ◽  
Photocatalytic Oxidation ◽  
Solar Light ◽  
Complete Oxidation ◽  
Simultaneous Production ◽  
Tio2 Catalyst ◽  
Production Of Hydrogen

AbstractThe photocatalytic degradation of a variety of carbohydrates in solution, including mono-, di-, and poly-saccharides, has been investigated under unaerated conditions with the use of a Pt/TiO2 catalyst and a solar light simulating source. It has been found that, even in the absence of oxygen, complete oxidation of carbohydrates toward CO

scholarly journals Influence of Operating Parameters on Photocatalytic Oxidation of 2,4-Dichlorofenol in Aqueous Solution by TiO2/Stainless Steel Photocatalytic Membrane

2021 ◽  
Vol 11 (24) ◽  
pp. 11664
Author(s):  
Liliana Bobirică ◽  
Constantin Bobirică ◽  
Giovanina Iuliana Lupu ◽  
Cristina Orbeci
Keyword(s):  
Stainless Steel ◽  
Photocatalytic Degradation ◽  
Photocatalytic Oxidation ◽  
Oxidation Process ◽  
Organic Substrate ◽  
Molar Ratio ◽  
Operating Parameters ◽  
Photocatalytic Reactor ◽  
Initial Concentration ◽  
Working Solution

The influence of some operating parameters of an UV photocatalytic reactor with TiO2/stainless steel photocatalytic membrane on the photocatalytic oxidation of 2,4-dichlorophenol from aqueous solutions was studied in this paper. It was shown that the pH of the working solution substantially influences the photocatalytic degradation of the organic substrate, with the degradation efficiency increasing with decreasing the pH of the working solution by a maximum corresponding to pH 3. The rate constant of the photocatalytic oxidation process is about twice as high at pH 3 comparative with pH 7 for the same initial concentration of the organic substrate. The molar ratio of hydrogen peroxide/organic substrate also influences the photocatalytic oxidation process of the organic substrate. The results obtained in this paper highlight the fact that a stoichiometric molar ratio is favorable for the photocatalytic degradation of 2,4-dichlorophenol. It has also been shown that the initial concentration of the organic substrate influences the rate of photocatalytic degradation. It appears that the rate of photocatalytic degradation decreases with the increasing of initial concentration of 2,4-dichlorophenol.

Enhanced ofloxacin degradation efficiency on porous CeTi2O6 photocatalyst-CTAB induced porosity

2020 ◽  
Vol 16 ◽  
Author(s):  
Lili Yang ◽  
Chuanguo Li ◽  
Wenjie Zhang
Keyword(s):  
Electron Microscopy ◽  
Porous Structure ◽  
Photocatalytic Degradation ◽  
Surface Area ◽  
Organic Pollutants ◽  
Photoelectron Spectroscopy ◽  
Photocatalytic Oxidation ◽  
Uv Light ◽  
Light Illumination ◽  
X Ray

BACKGROUND: Photocatalytic oxidation of organic pollutants in the environment has been studied for more than half a century. Titanate has the activity on degradation of organic pollutants under UV light illumination. Template directed sol-gel method is capable of producing porous structure in titanate during high temperature thermal treatment. METHODS: The materials were characterized using X-ray powder diffraction, transmission electron microscopy, scanning electron microscopy, surface area and pore size analyses, UV-Visible spectrometry, and X-ray photoelectron spectroscopy. Photocatalytic activity of the CeTi2O6 material was evaluated through ofloxacin degradation. RESULTS: Brannerite structured CeTi2O6 was the major component in the samples, and the addition of CTAB caused a slight growth of CeTi2O6 crystals. Porous structure formed in the porous sample after the removal of CTAB template, and the surface area and pore volume were greatly enlarged. The first order reaction rate constant for photocatalytic degradation of ofloxacin was 9.60×10-3 min-1 on the nonporous CeTi2O6 sample, and it was as large as 2.44×10-2 min-1 on the porous CeTi2O6 sample. The addition of CTAB can influence the physico-chemical properties of the porous CeTi2O6, such as the improved activity on photocatalytic degradation of ofloxacin. CONCLUSION: The CeTi2O6 samples were composed of majority brannerite CeTi2O6, and CeTi2O6 crystallite sizes for the nonporous and porous samples were 38.1 and 43.2 nm. The burning up of CTAB during calcination produced abundant pores in the porous material. After 50 min of reaction, photocatalytic degradation efficiencies on the nonporous and porous CeTi2O6 samples were 38.1% and 70.5%.

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