scholarly journals Sonocatalytic degradation of methyl orange in aqueous solution using Fe-doped TiO2 nanoparticles under mechanical agitation

2018 ◽  
Vol 16 (1) ◽  
pp. 1283-1296 ◽  
Author(s):  
Shoujian Song ◽  
Changchun Hao ◽  
Xianggang Zhang ◽  
Qing Zhang ◽  
Runguang Sun
Keyword(s):  
Aqueous Solution ◽  
Methyl Orange ◽  
Response Surface ◽  
Ultrasonic Irradiation ◽  
Ph Value ◽  
Irradiation Time ◽  
Ultrasonic Frequency ◽  
Mechanical Agitation ◽  
Initial Concentration ◽  
Degradation Of Methyl Orange

AbstractIn the present study, the Fe-doped TiO2 modified nanoparticles was successfully synthesized by the combination of the sol-gel method and heat treatment, and the degradation of methyl orange was tested by the combination method of ultrasonic radiation and mechanical agitation. The effects of different factors on the degradation of methyl orange (MO) solution were studied, such as ultrasonic irradiation time, the ultrasonic frequency, the added amount of catalyst, the initial pH value, the initial concentration of methyl orange, and revolutions per minute. The optimal experimental conditions for sonocatalytic degradation of the MO obtained were: ultrasonic irradiation time = 60 min, pH value = 3.0 and revolutions per minute = 500 rpm. By means of response surface analysis, the best fitting conditions were as follows: ultrasonic frequency = 36.02 kHz, added amount of catalyst = 490.50 mg/L, the initial concentration of methyl orange = 9.22 mg/L, and the optimum condition was close to the experimental data by response surface method. Under optimal conditions, the sonocatalytic degradation of MO was 99%. The degradation of MO showed that the combination of Fe-doped modified TiO2 nanoparticles, mechanical agitation and ultrasonic irradiation was discovered that can degrade methyl orange effectively in aqueous solution.

The Study on Photocatalytic Degradation of Methyl Orange Using SrFe0.5Co0.5O3-δ

2014 ◽  
Vol 576 ◽  
pp. 45-48 ◽  
Author(s):  
Fang Fang Liu ◽  
Jun Qiao ◽  
Chao Li ◽  
Hong Yan Meng ◽  
Xiang Hong Huang
Keyword(s):  
High Pressure ◽  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Ph Value ◽  
Irradiation Time ◽  
Methyl Orange Solution ◽  
Perovskite Oxides ◽  
Initial Concentration ◽  
Orange Solution ◽  
Degradation Of Methyl Orange

Perovskite oxides SrFe0.5Co0.5O3-δsample was synthesized by citrate method. The structures and morphology of materials were analyzed by XRD and SEM respectively. The powder sintered at 850°C was used as photocatalyst for degrading the methyl orange solution under a high pressure mercury 400W lamp. Some effects on the photocatalytic degradation of methyl orange, such as the irradiation time, catalyst dose, initial concentration, pH value and H2O2were investigated in the process. The results showed the photocatalytic degradation efficiency of Methyl orange was up to 94.55% in 100 mL10 mg/L methyl orange solution containing 0.2 g catalyst for irradiation time of 120 min

Evaluation of Ammonia-Nitrogen Removal by Ultrasonic Irradiation in Synthetic Solution Using Response Surface Methodology

2019 ◽  
Vol 797 ◽  
pp. 108-117
Author(s):  
Khadijah Mohamad Aris ◽  
Suzana Ramli ◽  
Zulhafizal Othman ◽  
Jurina Jaafar
Keyword(s):  
Response Surface Methodology ◽  
Regression Model ◽  
Response Surface ◽  
Removal Efficiency ◽  
Ultrasonic Irradiation ◽  
Irradiation Time ◽  
Ammonia Nitrogen ◽  
Quadratic Regression ◽  
Initial Concentration ◽  
Synthetic Solution

The objective of this study was to evaluate the ability of ultrasonic irradiation to remove ammonia-nitrogen in synthetic solution by considering the factors including initial concentration, pH and irradiation time. Ultrasonic bath was used to provide a constant effective power, frequency and temperature of 150 W, 37 kHz and 60°C, respectively during sonication. It was revealed that the removal efficiency of ammonia-nitrogen improved at lower concentration with basic water environment and extended irradiation time. Based on this judgement, optimization is carried out by using response surface methodology (RSM) of Box Behnken design to develop a quadratic regression model in order to analyze the interactions between the three factors and their effects on the removal efficiency. Optimum removal achieved from the model was found to be 82.26% at 10 mg/L of initial concentration with pH of 11 and sonication for 30 minutes. Verification of the quadratic regression model is done by comparing with the experimental work conducted within the experimental domain.

scholarly journals Efficient degradation of methyl orange and methylene blue in aqueous solution using a novel Fenton-like catalyst of CuCo-ZIFs

2022 ◽  
Vol 11 (1) ◽  
pp. 71-83
Author(s):  
Thanh H. V. Luong ◽  
Thao H. T. Nguyen ◽  
Binh V. Nguyen ◽  
Nghia K. Nguyen ◽  
Thanh Q. C. Nguyen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Wastewater Treatment ◽  
Methyl Orange ◽  
Industrial Wastewater ◽  
Zeolitic Imidazolate Framework ◽  
Initial Concentration ◽  
Degradation Reaction ◽  
Catalyst Dosage ◽  
Degradation Of Methyl Orange

Abstract In this study, the synthesized CuCo-zeolitic imidazolate framework (ZIF) catalyst was used to degrade methyl orange (MO) and methylene blue (MB) in water via a novel Fenton-like catalytic reaction. Effects of catalyst dosage, H2O2 concentration, initial concentration of the contaminants, and reaction time were evaluated. The results showed that MO and MB decomposition efficiencies were highly influenced by CuCo-ZIF concentration. The presence of H2O2 accelerated the degradation reaction of both MO and MB. Although it took 100 min to complete the removal of MB, it was 60 min for MO. At concentrations of MO and MB lower than 40 mg·L−1, the catalyst showed an almost complete degradation. The CuCo-ZIF catalyst presented a good recyclability with more than 90% removal of MO and MB after four times and five times reuse, respectively. These results demonstrated that MO and MB were efficiently degraded by a Fenton-like catalyst of CuCo-ZIFs and its potential in industrial wastewater treatment.

Optimization of Chlorella pyrenoidosa Removal by Low Frequency Ultrasonic Irradiation Using Response Surface Design

2011 ◽  
Vol 295-297 ◽  
pp. 1860-1865 ◽  
Author(s):  
Zhi Zhang ◽  
Chao Liu ◽  
Gong Duan Fan ◽  
Jing Luo ◽  
Yan Dong Wang
Keyword(s):  
Response Surface ◽  
Irradiation Time ◽  
Removal Rate ◽  
Low Frequency ◽  
Chlorella Pyrenoidosa ◽  
Ultrasonic Frequency ◽  
Ultrasonic Power ◽  
Control Parameters ◽  
Single Factor ◽  
Surface Design

The control parameters of the removal of Chlorella pyrenoidosa, which was irradiated by low frequency ultrasonic, is optimized by using single factor experiments and response surface methodology (RSM). First of all, the approximate ranges of the ultrasonic frequency, the ultrasonic power and the irradiation time were estimated with single factor experiments for the further experiments. And then the optimized values of the three control parameters were determined, which were analyzed by using central composite design (CCD) and RSM. The results showed that the removal rate of chlorophyll-a could reach to 64.1% after the irradiation for 6.34min by using ultrasonic of 77.7 kHz and 250W. Ultrasonic technology can remove Chlorella pyrenoidosa cells in water quickly and effectively, so as to achieve the purpose of water purification.

Photocatalytic Degradation of Methyl Orange on Iron Niobate Prepared by Solid-State Reaction

2010 ◽  
Vol 113-116 ◽  
pp. 2021-2024 ◽  
Author(s):  
Wen Jie Zhang ◽  
Xin Sun ◽  
Bai Han Chen
Keyword(s):  
Methyl Orange ◽  
Solid State ◽  
Photocatalytic Degradation ◽  
Solid State Reaction ◽  
Irradiation Time ◽  
Molar Ratio ◽  
Preparation Conditions ◽  
New Type ◽  
Iron Niobate ◽  
Degradation Of Methyl Orange

Iron niobate photocatalyst as a new type of photocatalyst was prepared by solid-state reaction of Fe3O4 and Nb2O5 and its activity was evaluated using photocatalytic degradation of methyl orange. Preparation conditions such as calcination temperature and time, and irradiation time were investigated according to photocatalytic efficiencies. FeNb2O6 was produced during calcination below 700 oC and FeNbO4 was produced above 800 oC. Iron niobate with optimum activity could be prepared after calcination at 700 oC for 8 h when Fe:Nb molar ratio was 0.8:1. Methyl orange degradation rate was 72.7% after 180 min of irradiation at photocatalyst concentration of 4 g/l.

scholarly journals Preparation of Nanosized Zero-Valent zinc (Zn0) Immobilized on ZnO as Redox Nanocomposite for Degradation of Methyl Orange from Aqueous Solution

2019 ◽  
Author(s):  
Samira Taherkhani ◽  
Ali Khani
Keyword(s):  
Aqueous Solution ◽  
Methyl Orange ◽  
Gas Flow ◽  
Degradation Process ◽  
Degradation Efficiency ◽  
Effect Of Temperature ◽  
Order Kinetic ◽  
Zno Nanopowder ◽  
Order Kinetic Model ◽  
Degradation Of Methyl Orange

Introduction: In this study, nanosized zero-valent zinc (Zn0) as a reducing agent, simultaneously synthesized and immobilized on an oxidizing agent, ZnO photocatalyst for degradation of methyl orange (MO) from the aqueous solution. Materials and Methods: The prepared redox nanocomposite (nZn0-ZnO) was characterized by the XRD and SEM techniques. The prepared sample was separated by centrifuging. The preparation process of nZn0-ZnO including synthesis-immobilization, washing, and drying carried out under Argon gas flow. Moreover, the effect of temperature and kinetics reaction was studied. Results: The results showed that degradation efficiency of prepared redox nanocomposite was increased compared to each ZnO nanopowder and Zn0 under the same operational condition. The calculated activation energy for the degradation process was 4.05 KJ.mol-1. Finally, the results showed that the degradation processes followed pseudo first order kinetic model in the basic condition by the relative deviation modulus. Conclusion: As compared to ZnO nanopowder and Zn0, the prepared redox nanocomposite showed high degradation efficiency for the removal of methyl orange from the aqueous solution.

scholarly journals The Catalytic Degradation Performance of α-FeOOH Doped with Silicon on Methyl Orange

2016 ◽  
Vol 11 (1) ◽  
pp. 120
Author(s):  
Yonghua Lu ◽  
Weiwei Gao ◽  
Fang Xu ◽  
Guangxian Zhang ◽  
Fengxiu Zhang
Keyword(s):  
Methyl Orange ◽  
Sodium Silicate ◽  
Chemical Reaction ◽  
Crystalline Phase ◽  
Ph Value ◽  
Catalytic Degradation ◽  
Reaction Engineering ◽  
Degradation Reaction ◽  
Degradation Of Methyl Orange ◽  
Chemical Reaction Engineering

<p>In order to improve the catalytic degradation property of α-FeOOH, α-FeOOH was doped with sodium silicate. The α-FeOOH doped with silicon was used as catalyst to catalyze the degradation of methyl orange. The XRD spectra showed that the crystalline phase of α-FeOOH doped with silicon was same as that of α-FeOOH; The catalytic degradation property of α-FeOOH doped with silicon was 21.7% higher than that of α-FeOOH; The results showed that catalytic degradation of methyl orange was almost degraded thoroughly at the conditions that the concentration of α-FeOOH doped with silicon in the solution was 0.73 g/L, the concentration of H<sub>2</sub>O<sub>2</sub> was 0.231 mmol/L. The pH value was between 2 and 3, and the degradation reaction was carried out at 60 <sup>o</sup>C for at least 20 min. Copyright © 2016 BCREC GROUP. All rights reserved </p><p><em>Received: 5<sup>th</sup> November 2015; Revised: 9<sup>th</sup> January 2016; Accepted: 13<sup>rd</sup> January 2016</em></p><p><strong>How to Cite</strong>: Lu, Y., Gao, W., Xu, F., Zhang, G., Zhang, F. (2016). The Catalytic Degradation Performance of α-FeOOH Doped with Silicon on Methyl Orange.<em> Bulletin of Chemical Reaction Engineering &amp; Catalysis</em>, 11 (1): 120-124. (doi:10.9767/bcrec.11.1.434.120-124)</p><p><strong>Permalink/DOI</strong>: <a href="http://dx.doi.org/10.9767/bcrec.11.1.434.120-124">http://dx.doi.org/10.9767/bcrec.11.1.434.120-124</a></p><p> </p>

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