Pharmaceutical Removal from Synthetic Wastewater Using Heterogeneous - Photocatalyst

2015 ◽  
Vol 802 ◽  
pp. 507-512 ◽  
Author(s):  
Chee Mei Lee ◽  
Puganeshwary Palaniandy ◽  
Nastaein Qamaruz Zaman ◽  
Mohd Nordin Adlan
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Degradation ◽  
Degradation Rate ◽  
Treatment Process ◽  
Treatment Method ◽  
Synthetic Wastewater ◽  
Optimum Ph ◽  
Pharmaceutical Removal ◽  
Ph Range ◽  
Very High

Compound Parabolic Collecting Reactor (CPCR) was designed and used for the heterogeneous-photocatalytic treatment process. Sunray was act as an economically and ecologically sensible light source. The photocatalytic degradation of paracetamol in the synthetic wastewater by using titanium dioxide (TiO2) was investigated. The experimental results show that the paracetamol removal rates were very high and nearly equal (97.2% to 99.7%) at pH 4-7 and TiO2 concentration of 0.5-1 g/L. This implies that the photocatalytic degradation rate of paracetamol is not affected by pH range in this study as the electrostatic interaction between the TiO2 and paracetamol is not able to be developed unless a wider range of pH is set. Furthermore, the concentration of TiO2 of 0.5 g/L is too high to treat the concentration of 10 mg/L of paracetamol. Further research is needed in order to identify the optimum pH condition and a suitable correlation of concentration between TiO2 and paracetamol. Finally, the results proved that the heterogeneous-photocatalyst treatment method which associated with the application of CPCR and solar energy is able to eliminate the paracetamol from the synthetic wastewater.

scholarly journals Enhanced Photocatalytic Degradation of Caffeine Using Titanium Dioxide Photocatalyst Immobilized on Circular Glass Sheets under Ultraviolet C Irradiation

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 964
Author(s):  
Rattana Muangmora ◽  
Patiya Kemacheevakul ◽  
Patiparn Punyapalakul ◽  
Surawut Chuangchote
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Degradation ◽  
Tio2 Film ◽  
Irradiation Time ◽  
Anatase Phase ◽  
Treated Wastewater ◽  
Synthetic Wastewater ◽  
Coated Glass ◽  
Caffeine Degradation ◽  
Ultraviolet C

This work presents the development of titanium dioxide (TiO2) film immobilized on circular glass sheets for photocatalytic degradation of caffeine under ultraviolet C (UVC) irradiation. TiO2 was synthesized through the ultrasonic-assisted sol–gel method and immobilized on circular glass sheets by the doctor blade technique. Polyvinylpyrrolidone (PVP) was used to mix with the TiO2 precursor solution to enhance film adhesion on the glass surface. TiO2 film was mainly composed of anatase phase with a small amount of rutile phase. Caffeine removal was found to increase with increasing irradiation time. Caffeine (20 mg/L) in the synthetic wastewater could not be detected after 3 h of UVC irradiation. The reaction rate of caffeine degradation followed the pseudo-first-order model. The concentrated caffeine solutions required a longer irradiation time for degradation. The used TiO2-coated glass sheets could be easily separated from the treated wastewater and reusable. The caffeine removal efficiency of TiO2-coated glass sheets in each cycle maintained a high level (~100%) during fifteen consecutive cycles.

scholarly journals MODIFICATION OF TITANIUM DIOXIDE NANOMATERIALS BY SULFUR FOR PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE EVEN UNDER VISIBLE LIGHT

2018 ◽  
Vol 54 (2A) ◽  
pp. 164
Author(s):  
Nguyen Tan Lam
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Sodium Sulfate ◽  
High Photocatalytic Activity ◽  
Doped Titanium Dioxide ◽  
Modification Of Titanium ◽  
Very High

This paper presents a study on preparation of sulfur doped titanium dioxide using potassium fluorotitanate and sodium sulfate as precursors. The obtained results indicated that the doped TiO2 exhibited very high photocatalytic activity for degradation of methylene blue even under visible light. The increasing in the added sulfur amounts led to significantly increase in the degradation of methylene blue. When the S/TiO2 mole ratios increased from 10 to 25%, the degradation of methylene blue under compact light increased from 30.87% to 67.06%, respectively.

scholarly journals Study on the Effectiveness of Banana Peel Coagulant in Turbidity Reduction of Synthetic Wastewater

2019 ◽  
Vol 6 (1) ◽  
pp. 82-90 ◽  
Author(s):  
N. M. Mokhtar ◽  
M. Priyatharishini ◽  
R. A. Kristanti
Keyword(s):  
Treatment Process ◽  
Detrimental Effect ◽  
Living Organism ◽  
Treatment Method ◽  
Synthetic Wastewater ◽  
Banana Peel ◽  
Natural Coagulant ◽  
Coagulant Dosage ◽  
Household Wastewater ◽  
Simple Extraction

Coagulation is an effective, simple and widely practiced water treatment method. However, the usage of chemical coagulant pose detrimental effect on living organism and human health as well as producing large amount of toxic sludge. This study describes the utilization of banana peel as a natural coagulant for the treatment of household wastewater. The natural coagulant extracted from banana peel was prepared by using simple extraction method. Synthetic wastewater was used in this study to imitate the medium strength household wastewater. The parameters investigated in this study were pH of wastewater, coagulant dosage, and solvent of extraction. The effectiveness of the natural coagulant was evaluated based on the reduction of turbidity during the treatment process. The treatment of synthetic wastewater using banana peel coagulant was found to be the most effective at pH 1 and dosage of 100 mg/l whereas the most effective solvent to extract this type of fruit waste is sodium hydroxide (NaOH). In present work, it can be concluded that the banana peel coagulant was highly feasible in removing turbidity of the synthetic wastewater with removal efficiency of 88% under optimum condition.

Treatment Strategy for Cr(VI)-Bearing Wastes

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2301-2304 ◽  
Author(s):  
C. F. Lin ◽  
W. Rou ◽  
K. S. Lo
Keyword(s):  
Compressive Strength ◽  
Specific Resistance ◽  
Synthetic Wastewater ◽  
Redox Titration ◽  
Treatment Processes ◽  
Optimum Ph ◽  
Ph Range ◽  
Chromium Wastes ◽  
Optimum Ph Range ◽  
Additional Dosage

The effects of reductants and alkali on the sludge quantity of chromium wastes and the teachability and physical properties of solidified chromium matrix are investigated in this study. FeSO4 and NaHSO3 are model reductants, and NaOH and Ca(OH)2 serve as bases, respectively. Portland cement was used to solidify Cr sludges generated from real wastes. Results from potentiometric redox titration showed that a 99.9% destruction of Cr(VI) at equivalence point is not achievable unless additional dosage is imposed. The extra amounts of reducing agent necessary for 99.9% conversion of Cr(VI) to Cr(III) is dependent on system parameters such as pH and type of reductants applied. An increase in operating pH where redox proceeds may acquire much more reducing chemicals than lower pH does. The optimum pH range for maximum precipitation is from 8.5 to 9.0. Chromium sludges generated from synthetic wastewater have a specific resistance from 8.7×l011 to 1.28×l013 m/kg. The use of Ca(OH)2 as base to precipitate Cr(III) produces sludge with lower specific resistance and larger particle size (near 20 to 60 µm). When examined with TCLP test, the chromium leachated out to the solution from matrix is generally less than 1 mg/L. Compressive strength of solidified sludge can reach near 10 kg/cm2 in 3 days based on 1:1 sludge/cement ratio. The compressive strength is affected by the type of reductants as well as the bases employed in the wastewater treatment processes. To producc a matrix with better compressive strength, it is recommended to use FeSO4 along with Ca(OH)2; however, if NaOH is used to control system pH, NaHSO3 is suggested to serve as reductant.

scholarly journals Preparation of Ti-Nb-Fe-O Nanotubes on Ti10NbxFe Alloy and the Application for Photocatalytic Degradation under Solar Irradiation

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 327
Author(s):  
Yujie Zhao ◽  
Qiquan Li ◽  
Yan Li
Keyword(s):  
Photocatalytic Degradation ◽  
Mixed Oxide ◽  
Tio2 Nanotubes ◽  
Degradation Rate ◽  
Solar Irradiation ◽  
Methylene Blue Degradation ◽  
Co Doping ◽  
Secondary Pollution ◽  
The Rich ◽  
Thick Layers

Highly oriented and self-ordered titanium-niobium-iron mixed oxide nanotubes were synthesized by anodizing Ti10NbxFe alloys in ethylene glycol electrolytes containing NH4F and water at 20 °C. The nanostructure morphologies were found to depend closely on the nature of the alloy substrates. The results demonstrate the possibility of growing mixed oxide nanotubes possessing several-micrometer-thick layers by a simple and straightforward electrochemical route. The methylene blue degradation rate of fabricated Ti-Nb-Fe-O nanotubes increased by 33% compared to TiO2 nanotubes and TiO2 nanoparticle films under solar irradiation. The combination of the gully-like morphology and the rich defects introduced by Nb and Fe co-doping in Ti-Nb-Fe-O mixed nanotube oxides was demonstrated to be beneficial for enhanced photocatalytic degradation performance. Ti-Nb-Fe-O nanotubes can achieve effective photodegradation without secondary pollution with more reusability than powder photocatalysts.

Phenolic Wastewater Treatment by Microwave-Induced H2O2-Fe (III)-Cu (II)/γ-Al2O3 Catalytic Oxidation Process

2013 ◽  
Vol 777 ◽  
pp. 101-105
Author(s):  
Jie Zhang ◽  
Wei Qian Pan ◽  
Tong Zheng ◽  
Peng Wang
Keyword(s):  
Catalytic Oxidation ◽  
Oxidation Process ◽  
Synthetic Wastewater ◽  
Reaction Rate Constants ◽  
Toc Removal ◽  
First Order Kinetics ◽  
Phenolic Pollutants ◽  
Phenolic Wastewater ◽  
Ph Range ◽  
Induction Stage

To achieve efficient removal of phenolic pollutants in water, the catalyst of Fe (III)-Cu (II)/γ-Al2O3 was prepared. In the presence of Fe (III)-Cu (II)/γ-Al2O3, microwave-induced hydrogen peroxide (H2O2) catalytic oxidation process was conducted for the treatment of synthetic wastewater containing PNP, a representative of phenolic pollutants. Effectiveness of the process and factors influencing PNP removal were investigated and results showed microwave-induced H2O2-Fe (III)-Cu (II)/γ-Al2O3 process could achieve 99.41% PNP removal percentage, corresponding to 77.9% TOC removal in a given condition. The process remained effective in the 2-8 pH range with high reusability of Fe (III)-Cu (II)/γ-Al2O3 catalyst. The kinetics study showed microwave-induced H2O2-Fe (III)-Cu (II)/γ-Al2O3 process could be divided into microwave induction stage and catalytic oxidation stage, both of which fitted first-order kinetics, with reaction rate constants of 0.0453 min-1 and 4.7552 min-1 respectively.

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