scholarly journals Phenol Photocatalytic Degradation by Advanced Oxidation Process under Ultraviolet Radiation Using Titanium Dioxide

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Ali Nickheslat ◽  
Mohammad Mehdi Amin ◽  
Hassan Izanloo ◽  
Ali Fatehizadeh ◽  
Seyed Mohammad Mousavi
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Degradation ◽  
Uv Radiation ◽  
Removal Efficiency ◽  
Quartz Glass ◽  
Contact Time ◽  
Phenol Concentration ◽  
Solution Ph ◽  
Glass Tubes ◽  
Initial Phenol Concentration

Background. The main objective of this study was to examine the photocatalytic degradation of phenol from laboratory samples and petrochemical industries wastewater under UV radiation by using nanoparticles of titanium dioxide coated on the inner and outer quartz glass tubes.Method. The first stage of this study was conducted to stabilize the titanium dioxide nanoparticles in anatase crystal phase, using dip-coating sol-gel method on the inner and outer surfaces of quartz glass tubes. The effect of important parameters including initial phenol concentration, TiO2catalyst dose, duration of UV radiation, pH of solution, and contact time was investigated.Results. In the dip-coat lining stage, the produced nanoparticles with anatase crystalline structure have the average particle size of 30 nm and are uniformly distributed over the tube surface. The removal efficiency of phenol was increased with the descending of the solution pH and initial phenol concentration and rising of the contact time.Conclusion. Results showed that the light easily passes through four layers of coating (about 105 nm). The highest removal efficiency of phenol with photocatalytic UV/TiO2process was 50% at initial phenol concentration of 30 mg/L, solution pH of 3, and 300 min contact time. The comparison of synthetic solution and petrochemical wastewater showed that at same conditions the phenol removal efficiency was equal.

scholarly journals Phenol Removal by a Novel Non-Photo-Dependent Semiconductor Catalyst in a Pilot-Scaled Study: Effects of Initial Phenol Concentration, Light, and Catalyst Loading

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Xiao Chen ◽  
Yan Liang ◽  
Xuefei Zhou ◽  
Yanling Zhang
Keyword(s):  
Titanium Dioxide ◽  
Uv Radiation ◽  
Phenol Degradation ◽  
Phenol Concentration ◽  
Catalyst Loading ◽  
Phenol Removal ◽  
Operational Parameters ◽  
Initial Concentration ◽  
Light Area ◽  
Initial Phenol Concentration

A novel non-photo-dependent semiconductor catalyst (CT) was employed to degrade phenol in the present pilot-scaled study. Effect of operational parameters such as phenol initial concentration, light area, and catalyst loading on phenol degradation, was compared between CT catalyst and the conventional photocatalyst titanium dioxide. CT catalyst excelled titanium dioxide in treating and mineralizing low-level phenol, under both mild UV radiation and thunder conditions of nonphoton. The result suggested that CT catalyst could be applied in circumstances when light is not easily accessible in pollutant-carrying media (e.g., particles, cloudy water, and colored water).

scholarly journals Removal of phenol from aqueous solution by adsorption onto seashells: equilibrium, kinetic and thermodynamic studies

2013 ◽  
Vol 3 (2) ◽  
pp. 119-127 ◽  
Author(s):  
Papita Das Saha ◽  
Jaya Srivastava ◽  
Shamik Chowdhury
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Phenol Concentration ◽  
Phenol Removal ◽  
Solution Ph ◽  
Initial Ph ◽  
Equilibrium Data ◽  
Initial Phenol Concentration ◽  
Adsorption Equilibrium Data ◽  
Adsorbent Dose

The efficacy of seashells as a new adsorbent for removal of phenol from aqueous solutions was studied by performing batch equilibrium tests under different operating parameters such as solution pH, adsorbent dose, initial phenol concentration, and temperature. The phenol removal efficiency remained unaffected when the initial pH of the phenol solution was in the range of 3–8. The amount of phenol adsorbed increased with increasing initial phenol concentration while it decreased with increasing temperature. The adsorption equilibrium data showed excellent fit to the Langmuir isotherm model with maximum monolayer adsorption capacity of 175.27 mg g−1 at pH 4.0, initial phenol concentration = 50 mg L−1, adsorbent dose = 2 g and temperature = 293 K. Analysis of kinetic data showed that the adsorption process followed pseudo-second-order kinetics. Activation energy of the adsorption process, calculated using the Arrhenius equation, was found to be 51.38 kJ mol−1, suggesting that adsorption of phenol onto seashells involved chemical ion-exchange. The numerical value of the thermodynamic parameters (ΔG0, ΔH0 and ΔS0) indicated that adsorption of phenol onto seashells was feasible, spontaneous and endothermic under the examined conditions. The study shows that seashells can be used as an economic adsorbent for removal of phenol from aqueous solution.

scholarly journals Evaluate the effectiveness of the UV/ persulfate process to remove catechol from solution aqueous

2021 ◽  
Keyword(s):  
Data Analysis ◽  
Aqueous Solutions ◽  
Uv Radiation ◽  
Removal Efficiency ◽  
Design Of Experiment ◽  
Contact Time ◽  
Batch Reactor ◽  
Acidic Ph ◽  
Optimum Conditions ◽  
Optimum Ph

<p>Catechol is used as an antioxidant, fungicide, and polymerization inhibitors in a variety of industries such as petrochemical. Catechol must be removed from effluents before it enters to environment. This study aimed to investigate combined UV radiation and persulfate process in removal of catechol from aqueous solutions. All experiments were performed in a batch reactor. Data analysis were done with Design of Experiment (DoE) software. The effects of various variables such as pH, initial persulfate concentration, and initial Catechol concentration were investigated. The findings indicated with increases in persulfate concentration and decrease in catechol concentrations, the removal efficiency increased. Acidic pH and UV radiation were the leading factors in removal of catechol. The optimum pH, persulfate concentration, and catechol concentration were obtained 7, 0.04 M, and 100 mg l-1, respectively. More removes of catechol was achieved in optimum conditions within contact time of 60 min. The synergic effects of UV and persulfate radical were about 88%. Approximately 60% of catechol was mineralized within contact time of 60 min. Persulfate radicals resulting from UV/S2O82- were the main effective oxidants in removal and mineralization of catechol. Owing to high removal efficiency of persulfate compounds which are, also, abundant and inexpensive, these can be applied in removal of persistent organic pollutants from aqueous solutions.</p>

scholarly journals Synthesis of Fe3O4 nanoparticles @Trioctylmethylammonium thiosalicylat (TOMATS) as a new magnetic nanoadsorbent for adsorption of ciprofloxacin in aqueous solution

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Ruhollah Kasraei ◽  
Mohammad Malakootian ◽  
Maryam Mohamadi
Keyword(s):  
Removal Efficiency ◽  
Contact Time ◽  
Physical Adsorption ◽  
Sorption Kinetics ◽  
Order Model ◽  
Solution Ph ◽  
Langmuir Adsorption ◽  
Ft Ir ◽  
Real Wastewater ◽  
Adsorbent Dose

AbstractThe aim of this research was to investigate ciprofloxacin (CIP) removal efficiency from aqueous solutions by using Fe3O4 nanoparticles @Trioctylmethylammonium thiosalicylat Ionic liquid (Fe3O4 NP@ TOMATS IL) as a new magnetic nanoadsorbent. The adsorbent was characterized by field emission scanning electron microscope-energy dispersive spectroscopy (FESEM-EDS), mapping, Fourier transform infrared spectroscopy (FT-IR), the Brunauer–Emmett–Teller (BET), X-ray powder diffraction (XRD). The effects of solution pH, adsorbent dose, contact time, initial CIP concentration, and temperature on CIP removal were also investigated. In optimal conditions such as pH = 5.6, CIP concentration = 30 mg/L, adsorbent dose = 0.15 g, temperature = 30 °C, contact time = 90 min, the removal efficiency in synthetic and real wastewater were obtained 87 and 73%, respectively. Batch experiments were carried out to study the sorption Kinetics, thermodynamics, and equilibrium isotherms of CIP with magnetic nanoadsorbent. The results show that all of the above factors influence CIP removal. The Langmuir adsorption isotherm fits the adsorption process well, with the pseudo second-order model describing the adsorption kinetics accurately. The thermodynamic parameters indicate that adsorption is mainly physical adsorption. Recycling experiments revealed that the behavior of adsorbent is maintained after recycling for four times.

scholarly journals Adsorption of Phenol from Aqueous Solution using Paper Waste

2019 ◽  
Vol 20 (1) ◽  
pp. 23-29
Author(s):  
Huda Adil Sabbar
Keyword(s):  
Contact Time ◽  
Phenol Concentration ◽  
Phenol Removal ◽  
Adsorption Models ◽  
Freundlich Model ◽  
Paper Waste ◽  
Equilibrium Data ◽  
Initial Phenol Concentration ◽  
Recyclable Resources ◽  
Adsorbent Dose

The exploitation of obsolete recyclable resources including paper waste has the advantages of saving resources and environment protection. This study has been conducted to study utilizing paper waste to adsorb phenol which is one of the harmful organic compound byproducts deposited in the environment. The influence of different agitation methods, pH of the solution (3-11), initial phenol concentration (30-120ppm), adsorbent dose (0.5-2.5 g) and contact time (30-150 min) were studied. The highest phenol removal efficiency obtained was 86% with an adsorption capacity of 5.1 mg /g at optimization conditions (pH of 9, initial phenol concentration of 30 mg/L, an adsorbent dose of 2 g and contact time of 120min and at room temperature). The well-known Langmuir and Freundlich adsorption models were studied. The results show that the equilibrium data fitted to the Freundlich model with R2=0.9897 within the concentration range studied. The main objective of this study is finding the best mixing and conditions for phenol removal by adsorption via paper waste.

scholarly journals Photocatalytic degradation of 2,4-dichlorophenoxyacetic acid from aqueous solutions by Ag3PO4/TiO2 nanoparticles under visible light: kinetic and thermodynamic studies

2021 ◽  
Author(s):  
Fatemeh Amiri ◽  
Mansooreh Dehghani ◽  
Zeinab Amiri ◽  
Saeed Yousefinejad ◽  
Aboolfazl Azhdarpoor
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Tio2 Nanoparticles ◽  
Removal Efficiency ◽  
Contact Time ◽  
Polluted Water ◽  
Dichlorophenoxyacetic Acid ◽  
Good Efficiency ◽  
Initial Concentration ◽  
2,4 Dichlorophenoxyacetic Acid

Abstract Between the countless chemical substances applied in agriculture, 2,4-dichlorophenoxyacetic acid (2,4-D) herbicide is considered as a toxic and carcinogenic pollutant which is difficult to be removed from water due to its biological and chemical stability and high solubility. The goal of this study was photocatalytic degradation of 2,4-D, using Ag3PO4/TiO2 nanoparticles under visible light. The Ag3PO4/TiO2 nanoparticles were characterized using XRD, FESEM and EDS analysis to investigate its crystal structure and elemental compounds. The effect of operating parameters such as pH, contact time, catalyst dose, initial concentration of herbicide on the efficiency of the process was studied. Increasing the pH and initial concentration of herbicide led to the reduction of the efficiency of removing the herbicide while, increasing contact time and catalyst dose increased the efficiency. The best result (98.4% removal efficiency) was achieved at pH = 3, 1 g/L catalyst dose, 60 min contact time, and 10 mg/L initial concentration of 2,4-D. According to the results, 2,4-D removal efficiency with Ag3PO4/TiO2 photocatalyst reached 96.1% from 98.4% after 5 cycles of reaction. The pseudo-first-order kinetics was the best for the 2,4-D degradation by Ag3PO4/TiO2 with correlation coefficients (R2 = 0.9945). The results demonstrated that the photocatalytic process using Ag3PO4/TiO2 nanoparticles in the presence of visible light had a relatively good efficiency in removing 2,4-D. Moreover, Ag3PO4/TiO2 can be used as a reusable photocatalyst for the degradation of such toxins from polluted water and wastewater.

scholarly journals Utilization of Cactus Peel as Biosorbent for the Removal of Reactive Dyes from Textile Dye Effluents

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Mebrahtu Gebrezgiher ◽  
Zebene Kiflie
Keyword(s):  
Removal Efficiency ◽  
Contact Time ◽  
Freundlich Isotherm ◽  
Textile Dye ◽  
Order Model ◽  
Solution Ph ◽  
Biosorption Process ◽  
Good Potential ◽  
Pseudo Second Order ◽  
Red Dye

Textile industries generate large quantities of dye containing wastewater which pose a serious environmental problem. Currently, biosorbents have become desirable for the removal of dyes from textile effluents. In this study, batch experiments were conducted to investigate the biosorption characteristics of cactus peel on the removal of reactive red dye from aqueous solutions. The effects of solution pH, biosorbent dosage, contact time, and initial concentration were studied. The interaction effects of process variables were analysed using response surface methodology. The results showed that removal efficiency increased as initial dye concentration and solution pH decreased and as biosorbent dosage and contact time increased. The highest removal efficiency (99.43%) was achieved at solution pH, initial dye concentration, biosorbent dose, and contact time of 3.0, 40 mg/l, 6 g, and 120 min, respectively. From regression analysis, the Langmuir isotherm was found to better (R2 = 0.9935) represent the biosorption process as compared with the Freundlich isotherm (R2 = 0.9722). Similarly, the pseudo-second-order model was seen to represent very well the biosorption kinetics. The results show that cactus peel has good potential for the removal of reactive red dye.

scholarly journals Batch and Continuously Operated Electrooxidation Process for Removal of Phenol from Aqueous Solutions

2001 ◽  
Vol 71 (3) ◽  
pp. 397-404
Author(s):  
Dimitrios Stergiopoulos ◽  
Konstantinos Dermentzis ◽  
Kokkoni Karakosta ◽  
Panagiotis Giannakoudakis
Keyword(s):  
Flow Rate ◽  
Current Density ◽  
Complete Removal ◽  
Phenol Concentration ◽  
Applied Current ◽  
Boron Doped Diamond ◽  
Solution Ph ◽  
Applied Current Density ◽  
Boron Doped ◽  
Initial Phenol Concentration

The treatment of aqueous phenol solutions is studied using the electrooxidation process with boron doped diamond (BDD) electrodes. The reduction of phenol concentration is followed by measurements of UV-Vis spectrophotometry and COD. Parameters affecting the efficiency of the electrooxidation process, such as solution pH, applied current density, initial phenol concentration, flow rate and conductivity are investigated. Effective and complete removal of phenol (]99 %) is achieved from solutions with initial phenol concentration of 100 mg/L in both, batch and continuously operated pocess.

scholarly journals Effect of Process Parameters on the Photocatalytic Degradation of Phenol in Oilfield Produced Wastewater using ZnO/Fe2O3 Nanocomposites.

2019 ◽  
Vol 15 (1) ◽  
pp. 128-136 ◽  
Author(s):  
Omer Al Haiqi ◽  
Abdurahman Hamid Nour ◽  
Rushdi Bargaa ◽  
Bamidele Victor Ayodele
Keyword(s):  
Solar Radiation ◽  
Photocatalytic Degradation ◽  
Calcination Temperature ◽  
Process Parameters ◽  
Batch Reactor ◽  
Phenol Degradation ◽  
Phenol Concentration ◽  
Catalyst Loading ◽  
Nanocomposite Catalyst ◽  
Initial Phenol Concentration

The upstream processing of crude oil is often associated with the presence of phenolic compounds when not properly treated could result in adverse effects on human health. The objective of the study was to investigate the effect of process parameters on the photocatalytic degradation of phenol. The ZnO/Fe2O3 nanocomposite photocatalyst was prepared by sol-gel method and characterized using various instrument techniques. The characterized ZnO/Fe2O3 nanocomposite displayed suitable physicochemical properties for the photocatalytic reaction. The ZnO/Fe2O3 nanocomposite was employed for the phenol degradation in a cylindrical batch reactor under solar radiation. The photocatalytic runs show that calcination temperature of the ZnO/Fe2O3 nanocomposite, catalyst loading, initial phenol concentration and pH of the wastewater significantly influence the photocatalytic degradation of phenol. After 180 min of solar radiation, the highest phenol degradation of 92.7% was obtained using the ZnO/Fe2O3 photocatalyst calcined at 400 ºC. This study has demonstrated that phenol degradation is significantly influenced by parameters such as calcination temperature of the ZnO/Fe2O3 nanocomposite, catalyst loading, initial phenol concentration and pH of the wastewater resulting in highest phenol degradation using the ZnO/Fe2O3 nanocomposite calcined at 400 ºC, initial phenol concentration of 0.5 mg/L, catalyst loading of 3 mg/L and pH of 3. Copyright © 2020 BCREC Group. All rights reserved

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