scholarly journals Photocatalytic Degradation of Rhodamine B with H3PW12O40/SiO2Sensitized by H2O2

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Shuijin Yang ◽  
Yongkui Huang ◽  
Yunzhi Wang ◽  
Yun Yang ◽  
Mingbo Xu ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Degradation Rate ◽  
Sol Gel ◽  
Light Irradiation ◽  
Natural Light ◽  
Order Kinetic ◽  
Solution Ph ◽  
Order Kinetic Model ◽  
Catalyst Dosage

In order to remove aquatic organic dye contaminants by utilizing the inexpensive and inexhaustible solar energy, the Keggin-type H3PW12O40was loaded on the surface of SiO2with the sol-gel method and sensitized by H2O2solution. The photocatalytic degradation of rhodamine B (RhB) by H3PW12O40/SiO2(x) under simulated natural light irradiation was investigated. The effects of the initial RhB concentration, the solution pH, and catalyst dosage on the photocatalytic degradation rate of RhB were also studied. The results demonstrated that at optimal condition (initial concentration of methyl orange is 10 mg/L, catalyst dosage is 0.8 g, and the pH is 2.5) the degradation rate of RhB is as high as 97.7% after 2 h under simulated natural light irradiation. The reaction of photocatalysis for RhB can be expressed as a first-order kinetic model.

scholarly journals Photocatalytic Degradation of Methyl Violet with TiSiW12O40/TiO2

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Shuijin Yang ◽  
Yulin Xu ◽  
Yongkui Huang ◽  
Guohui Zhou ◽  
Zhiyuan Yang ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Degradation Rate ◽  
Methyl Violet ◽  
Light Irradiation ◽  
Natural Light ◽  
Order Kinetic ◽  
Solution Ph ◽  
Visible Spectra ◽  
Order Kinetic Model ◽  
Catalyst Dosage

The photocatalytic degradation of methyl violet using TiSiW12O40/TiO2as a novel eco-friendly catalyst under simulated natural light irradiation was investigated. The physical characterizations were carried out by TG/DTA, FT-IR, XRD, and UV-visible spectra. The effects of the initial methyl violet concentration, the solution pH, and catalyst dosage on the photocatalytic degradation rate of methyl violet were also examined. The results demonstrated that at optimal condition (initial concentration of methyl violet is 20 mg/L, catalyst dosage is 0.3 g, and the pH is 5.5), the degradation rate of methyl violet is as high as 82.4% after 3 h under simulated natural light irradiation. The reaction of photocatalysis for methyl violet can be expressed as first-order kinetic model.

Photocatalytic Degradation of Methyl Violet with H3PW6Mo6O40/SiO2 Sensitized by H2O2

2013 ◽  
Vol 709 ◽  
pp. 70-73
Author(s):  
Guo Bin Duan ◽  
Yong Kui Huang ◽  
Li Yu ◽  
Shui Jin Yang
Keyword(s):  
Photocatalytic Degradation ◽  
Degradation Rate ◽  
Sol Gel ◽  
Methyl Violet ◽  
Light Irradiation ◽  
Natural Light ◽  
Order Kinetic ◽  
Initial Concentration ◽  
First Order ◽  
Order Kinetic Model

H3PW6Mo6O40/SiO2 was prepared by sol-gel method, and sensitized by H2O2 solution. The photocatalytic degradation of methyl violet by H3PW6Mo6O40/SiO2 under simulated natural light irradiation was investigated. The results demonstrated that at optimal condition (initial concentration of methyl violet is 10 mg/L, and the pH is 2.5, the dosage of catalyst is 0.5% based on feed stocks), the degradation rate of methyl violet is as high as 88.7 % after 2.5h simulated natural light irradiation. The reaction of photocatalysis for methyl violet can be expressed as first-order kinetic model.

Immobilization of Nano-TiO2 on Expanded Perlite for Photocatalytic Degradation of Rhodamine B

2011 ◽  
Vol 110-116 ◽  
pp. 3795-3800 ◽  
Author(s):  
Xiao Zhi Wang ◽  
Wei Wei Yong ◽  
Wei Qin Yin ◽  
Ke Feng ◽  
Rong Guo
Keyword(s):  
Catalytic Activity ◽  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Degradation Kinetics ◽  
Irradiation Time ◽  
Sol Gel ◽  
Polluted Water ◽  
Order Kinetic ◽  
Expanded Perlite ◽  
Initial Concentration

Expanded perlite (EP) modified titanium dioxide (TiO2) with different loading times were prepared by Sol-Gel method. Photocatalytic degradation kinetics of Rhodamine B (RhB) in polluted water by the materials (EP-nanoTiO2), as well as the effects of different loading times and the initial concentration of RhB on photocatalysis rate were examined. The catalytic activity of the regenerated photocatalyst was also tested. The results showed that photocatalyst modified three times with TiO2had the highest catalytic activity. Degradation ratio of RhB by EP-nanoTiO2(modified three times) under irradiation for 6 h were 98.0%, 75.6% and 63.2% for 10 mg/L, 20 mg/L and 30 mg/L, respectively.The photocatalyst activity has little change after the five times recycling, and the degradation rate of RhB decreased less than 8%. The reaction of photocatalysis for RhB with irradiation time can be expressed as first-order kinetic mode within the initial concentration range of RhB between 10mg/L and 30 mg/L. EP-nanoTiO2photocatalyst has a higher activity and stability to degrade RhB in aqueous solution.

scholarly journals Photocatalytic Degradation of Organic Dyes by H4SiW6Mo6O40/SiO2Sensitized by H2O2

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Li Yu ◽  
Yongkui Huang ◽  
Yun Yang ◽  
Yulin Xu ◽  
Guohong Wang ◽  
...  
Keyword(s):  
Degradation Rate ◽  
Organic Dyes ◽  
Irradiation Time ◽  
Order Kinetic ◽  
Optimal Conditions ◽  
Basic Fuchsin ◽  
First Order ◽  
Degradation Of Dyes ◽  
Order Kinetic Model ◽  
Catalyst Dosage

H4SiW6Mo6O40/SiO2was sensitized by H2O2solution that significantly improved its catalytic activity under simulated natural light. Degradation of basic fuchsin was used as a probe reaction to explore the influencing factors on the photodegradation reaction. The results showed that the optimal conditions were as follows: initial concentration of basic fuchsin 8 mg/L, pH 2.5, catalyst dosage 4 g/L, and light irradiation time 4 h. Under these conditions, the degradation rate of basic fuchsin is 98%. The reaction of photocatalysis for basic fuchsin can be expressed as the first-order kinetic model. After being used continuously for four times, the catalyst kept the inherent photocatalytic activity for degradation of dyes. The photodegradation of malachite green, methyl orange, methylene blue, and rhodamine B were also tested, and the degradation rate of dyes can reach 90%–98%.

Photodegradation of organic matter in fresh garbage leachate using immobilized nano-sized TiO2 as catalysts

2013 ◽  
Vol 69 (6) ◽  
pp. 1219-1226
Author(s):  
C. Chen ◽  
Q. Xie ◽  
B. Q. Hu ◽  
X. L. Zhao
Keyword(s):  
Organic Matter ◽  
Activated Carbon ◽  
Degradation Rate ◽  
Sol Gel ◽  
Oxygen Demand ◽  
Solution Ph ◽  
First Order ◽  
First Order Kinetics ◽  
Catalyst Dosage ◽  
H2o2 Addition

Two immobilized nano-sized TiO2 catalysts, TiO2/activated carbon (TiO2/AC) and TiO2/silica gel (SG) (TiO2/SG), were prepared by the sol–gel method, and their use in the photocatalytic degradation of organic matter in fresh garbage leachate under UV irradiation was investigated. The influences of the catalyst dosage, the initial solution pH, H2O2 addition and the reuse of the catalysts were evaluated. The degradation of organic matter was assessed based on the decrease of the chemical oxygen demand (COD) in the leachate. The results indicated that the degradation of the COD obeyed first-order kinetics in the presence of both photocatalysts. The degradation rate of COD was found to increase with increasing catalyst dosage up to 9 g/L for TiO2/AC and 6 g/L for TiO2/SG, above which the degradation began to attenuate. Furthermore, the degradation rate first increased and then decreased as the solution pH increased from 2 to 14, and the degradation rate increased as the amount of H2O2 increased to 2.93 mM, after which it remained constant. No obvious decrease in the rate of COD degradation was observed during the first four repeated uses of the photocatalysts, indicating that the catalysts could be recovered and reused. Compared with TiO2/AC, TiO2/SG exhibited higher efficiency in photocatalyzing the degradation of COD in garbage leachate.

Photocatalytic Degradation of Methyl Orange by Cu2O-MoO3

2014 ◽  
Vol 665 ◽  
pp. 483-486 ◽  
Author(s):  
Tao Huang ◽  
Yu Lin Xu ◽  
Chong An Lv ◽  
Shui Jin Yang
Keyword(s):  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Room Temperature ◽  
Degradation Rate ◽  
Solution Phase ◽  
Natural Light ◽  
X Rays ◽  
Reaction Conditions ◽  
Catalyst Dosage ◽  
Degradation Of Methyl Orange

Cu2O-MoO3 composites has been successfully fabricated by solution-phase reducing method at room temperature. All the powders were characterized by X-rays diffraction (XRD) and scanning electron microscopy (SEM), and explored the catalytic activity for the photocatalytic degradation of methyl orange. The effect of different factors on the degradation was investigated. The best reaction conditions were found out. The results demonstrated that initial concentration of methyl orange is 5 mg/L, the pH is 4, the catalyst dosage is 0.38 g/L and the H2O2 is 1.8 mL, the degradation rate of methyl orange is as high as 95.4% after 30 minutes simulated natural light irradiation.

Photocatalytic Degradation of Rhodamine B by TiO2/ZnO Nanofibers Under Visible Light Irradiation

2011 ◽  
Author(s):  
Carina Chun Pei ◽  
Wallace Woon-Fong Leung ◽  
Lijun Yang ◽  
Chi-ho Hung
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Visible Light Irradiation ◽  
Rhodamine B ◽  
Sol Gel ◽  
Volume Ratio ◽  
Precursor Solution ◽  
Light Irradiation ◽  
Polluted Water ◽  
Electrospinning Technique

Photocatalytic reduction of contaminants in wastewater or polluted water can be enhanced by finding a suitable catalyst with property that utilizes an extended light adsorption spectrum, reducing the recombination of electron-hole pairs, and casting the catalyst into a form with large surface-to-volume ratio to be in contact with the contaminants. Based on these objectives, Zn-doped TiO2 nanoparticles with high photocatalytic activity were synthesized by the sol–gel assisted nozzle-less electrospinning technique followed by calcining the precursor Ti(OiPr)4/ZnAc/PVP nanofibers in air in the temperature range of 450–650°. The thermal decomposition behavior was studied by thermogravimetric analyser and differential scanning calorimeter (TGA–DSC), and the morphology and crystal structure were monitored by scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). With the different concentration of zinc acetate in the precursor solution, the diameter of fibers ranged from 80–130 nm. The photocatalytic degradation of rhodamine B dye under visible light irradiation was also studied. It is found that the photosensitized degradation activity can be optimized by doping an appropriate amount of Zn (0.30 wt. %). Hence, the enhanced photodegradation of dyes with a new photocatalyst nanofiber under visible irradiation can be realized, which can take better use of solar energy.

Phosphorus removal from aqueous solution using a novel granular material developed from building waste

2017 ◽  
Vol 75 (6) ◽  
pp. 1500-1511 ◽  
Author(s):  
Shengjiong Yang ◽  
Pengkang Jin ◽  
Xiaochang C. Wang ◽  
Qionghua Zhang ◽  
Xiaotian Chen
Keyword(s):  
Granular Material ◽  
Chemical Precipitation ◽  
Phosphate Removal ◽  
Precipitation Process ◽  
Order Kinetic ◽  
Solution Ph ◽  
Experimental Conditions ◽  
Removal Capacity ◽  
Order Kinetic Model ◽  
Pseudo Second Order

In this study, a granular material (GM) developed from building waste was used for phosphate removal from phosphorus-containing wastewater. Batch experiments were executed to investigate the phosphate removal capacity of this material. The mechanism of removal proved to be a chemical precipitation process. The characteristics of the material and resulting precipitates, the kinetics of the precipitation and Ca2+ liberation processes, and the effects of dosage and pH were investigated. The phosphate precipitation and Ca2+ liberation processes were both well described by a pseudo-second-order kinetic model. A maximum precipitation capacity of 0.51 ± 0.06 mg g−1 and a liberation capacity of 6.79 ± 0.77 mg g−1 were measured under the experimental conditions. The processes reached equilibrium in 60 min. The initial solution pH strongly affected phosphate removal under extreme conditions (pH <4 and pH >10). The precipitates comprised hydroxyapatite and brushite. This novel GM can be considered a promising material for phosphate removal from wastewater.

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