scholarly journals Oxidation of Sulfonamides in Aqueous Solution by UV-TiO2-Fe(VI)

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Yan Ma ◽  
Kejia Zhang ◽  
Cong Li ◽  
Tuqiao Zhang ◽  
Naiyun Gao
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Degradation ◽  
Conduction Band ◽  
Uv Irradiation ◽  
Photocatalytic Oxidation ◽  
Ph Value ◽  
Electron Acceptors ◽  
Potassium Ferrate ◽  
The Stability ◽  
Complete Mineralization

The photocatalytic degradation of sulfonamides in aqueous TiO2suspension under UV irradiation has been investigated using potassium ferrate as electron acceptors. The results showed that the stability of Fe(VI) is dependent on pH significantly, and the stability reduces obviously in the presence of UV-TiO2. The experiments indicated that Fe(VI) could effectively scavenge the conduction band electrons from the surface of TiO2. The photocatalytic oxidation of sulfonamides with Fe(VI) was found to be much faster than that without Fe(VI). The SD, SM, and SMX concentration was greatly reduced by 89.2%, 83.4%, and 82.0%, respectively, after 10 min with UV-TiO2-Fe(VI), comparing to 65.2%, 66.0%, and 71.9%, respectively, with Fe(VI) only in the dark and 71.3%, 72.7%, and 76.0%, respectively, with UV-TiO2. The pH value of solution significantly influenced the sulfonamides degradation in UV-TiO2-Fe(VI) system. The degradation amount of sulfonamides after 10 min was a maximum at pH 7. The intermediate products of sulfonamides oxidation by UV-TiO2-Fe(VI) were analysed by LC-HESI-MS-MS and the results suggested that a majority of sulfonamides turned into large-molecule products without complete mineralization.

Study on Influence of Polyethylene Glycol on Dispersion of Pyrite Powder in Aqueous Solution

2012 ◽  
Vol 554-556 ◽  
pp. 349-352
Author(s):  
Dan Li ◽  
Zhou Lan Yin ◽  
Qi Yuan Chen
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Bonding ◽  
Polyethylene Glycol ◽  
Spectroscopic Analysis ◽  
Ph Value ◽  
Aqueous Suspension ◽  
Dispersion Stability ◽  
The Stability ◽  
High Degree ◽  
Effective Additive

The influences of three kinds of polyethylene glycol (PEG), namely PEG-200, PEG-1000 and PEG-20000, on the dispersion stability of pyrite powder in aqueous solution were investigated by spectrophotometry. The results indicated that the stability of pyrite powder dispersed in aqueous solution was remarkably dependent upon the molecular weight and content of PEG, pH value of suspension, and ultrasonication power. Among three kinds of polyethylene glycol, PEG-20000 was the most effective additive to improve the dispersion stability and wettability of pyrite powder in water. When 8% PEG-20000 was employed as the dispersant, the best dispersion stability of pyrite powder in aqueous solution could be obtained under the conditions of pH at 5-6 and 100-W ultrasonication power. The FTIR spectroscopic analysis showed that the adsorption between the polyethylene glycol and pyrite ore powder was formed by hydrogen bonding. The adsorption of polyethylene glycol onto the surface of pyrite powder via hydrogen bonding provided a high degree of steric stabilization, which effectively prohibited the aggregation of pyrite powder, and thus the dispersion stability of as-formed aqueous suspension was promoted.

Ultraviolet irradiation combined with manganese ore catalyzed ozonation of 4-chlorophenol in aqueous solution

2010 ◽  
Vol 10 (1) ◽  
pp. 97-104 ◽  
Author(s):  
Jie Fu ◽  
Guo Chen ◽  
Ying Yang ◽  
Zhi-Ming Zhang ◽  
Qing-Fu Zeng ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
High Pressure ◽  
Uv Irradiation ◽  
Catalytic Effect ◽  
Ph Value ◽  
Manganese Ore ◽  
Mercury Lamp ◽  
Acid Condition ◽  
Important Species ◽  
Uv Lamp

We have investigated ultraviolet (UV) irradiation combined with manganese ore (MO) catalyzed ozonation of 4-cholorophenol (4-CP) in aqueous solution. The preliminary results showed UV irradiation and MO had a strong synergetic catalytic effect on ozonation. We also studied the effect of UV lamp power, MO dosage, O3 dosage, initial 4-CP concentration, pH value and temperature. The results showed that high pressure mercury lamp (HPML) was more favorable for the degradation of 4-CP than low pressure mercury lamp (LPML). The optimal MO and O3 dosages were 2 g/L and 2 g/h respectively. When the 4-CP concentration was over 15 mg/L, the decrease of degradation efficiency accelerated. The acid condition was favorable for the degradation of 4-CP by UV/MO/O3. The reaction temperature could not be over 50°C. Through the mechanism discussion, we found that Mn2 +  was the most important species to catalyze the ozonation. In addition, UV irradiation could also accelerate the degradation by promoting the production of ∙OH.

Study on the Photocatalytic Degradation of Ammonia Nitrogen in Aquaculture Wastewater by Fe3+-Doped Nano-TiO2 under UV Irradiation

2012 ◽  
Vol 476-478 ◽  
pp. 2001-2004
Author(s):  
Xiao Cai Yu ◽  
Peng Fei Zhu ◽  
Kui Sheng Song ◽  
Dong Dong Hu ◽  
Qian Du
Keyword(s):  
Reaction Time ◽  
Photocatalytic Degradation ◽  
Uv Irradiation ◽  
Volume Fraction ◽  
Ph Value ◽  
Removal Rate ◽  
Ammonia Nitrogen ◽  
Nano Tio2 ◽  
Initial Concentration ◽  
Aquaculture Wastewater

The Fe3+-doped nano-TiO2 catalyst with various amounts of dopant Fe3+ irons was prepared by a sol-gel method. The products were characterized by XRD and SEM. The photocatalytic degradation of ammonia nitrogen in aquaculture wastewater was investigated by using Fe3+-doped nano-TiO2 under UV irradiation. In the experiment, the effect of Fe3+/TiO2 dosage, the ratio of dopant Fe3+, ammonia-N initial concentration, pH value, H2O2 volume concentration, and reaction time, respectively, on the removal of ammonia-N was investigated. The experimental results can be stated as follows: when the ratio of dopant Fe3+ was 0.25% wt, the dosage of Fe3+/TiO2 was 0.7 g/L, the initial concentration of ammonia-N was 10 mg/L, H2O2 volume fraction was 4 %, respectively, if the reaction time may last 4 h, the removal rate of ammonia-N was expected to reach 97.17 %.

Photocatalytic Removal of Reactive Black-5 Dye from Aqueous Solution by UV Irradiation in Aqueous TiO2: Equilibrium and Kinetics Study

2011 ◽  
Vol 14 (2) ◽  
Author(s):  
Mehdi Shirzad Siboni ◽  
Mohamadreza Samarghandi ◽  
Jae-Kyu Yang ◽  
Seung-Mok Lee
Keyword(s):  
Aqueous Solution ◽  
Uv Irradiation ◽  
Photocatalytic Oxidation ◽  
Reactive Black 5 ◽  
Kinetics Study ◽  
Photocatalytic Removal ◽  
Equilibrium And Kinetics

AbstractIn this work, photocatalytic oxidation of reactive Black-5(RB-5) dye was investigated with illuminated TiO

KINETICS OF PHOTOCATALYTIC DEGRADATION OF REACTIVE YELLOW 17 DYE IN AQUEOUS SOLUTION USING UV IRRADIATION

2001 ◽  
Vol 36 (2) ◽  
pp. 203-213 ◽  
Author(s):  
B. Neppolian ◽  
S. Sakthivel ◽  
Banumathi Arabindoo ◽  
M. Palanichamy ◽  
V. Murugesan
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Degradation ◽  
Uv Irradiation ◽  
Kinetics Of

Photocatalytic degradation of methyl-red by immobilised nanoparticles of TiO2 and ZnO

2004 ◽  
Vol 49 (4) ◽  
pp. 183-188 ◽  
Author(s):  
R. Comparelli ◽  
P.D. Cozzoli ◽  
M.L. Curri ◽  
A. Agostiano ◽  
G. Mascolo ◽  
...  
Keyword(s):  
Benzoic Acid ◽  
Photocatalytic Degradation ◽  
Uv Irradiation ◽  
Photocatalytic Oxidation ◽  
Solid Support ◽  
Methyl Red ◽  
Experimental Conditions ◽  
Nanosized Zno ◽  
By Products

In this work, we report on the degradation of methyl-red (2-(4-Dimethylamino-phenylazo)-benzoic acid - C.I. 13020) under UV irradiation in the presence of nanosized ZnO and TiO2. Oxide nanocrystals with controlled size were synthesised by using non-hydrolytic approaches and tested for the photocatalysed degradation. The performances of the immobilised nanoparticles were compared with their commercial counterparts after immobilization onto a solid support. The influence of some experimental conditions, namely pH and dye concentration, were investigated by monitoring the dye decoloration spectrophotometrically. Several intermediate by-products were identified by HPLC-MS, showing that two different mechanisms were operative during the photocatalytic oxidation.

Effect of Samarium on the Photocatalytic Property of Sm-TiO2/CNFs Composites

2009 ◽  
Vol 79-82 ◽  
pp. 541-544 ◽  
Author(s):  
Li Ying Zhu ◽  
Xiao Ping Yang ◽  
Dong Hua Teng ◽  
Yun Hua Yu
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Tio2 Nanoparticles ◽  
Carbon Nanofibers ◽  
Uv Irradiation ◽  
Photocatalytic Property ◽  
Uniform Size ◽  
Degradation Of Methyl Orange

Composites of Sm doped TiO2 nanoparticles dispersed on carbon nanofibers (Sm-TiO2/CNFs) with different Sm contents were prepared by preoxidation, hydrolyzation and calcination of Sm-TiO2 precursor/PAN nanofibers. The characterizations of SEM, EDX, XPS and XRD showed that the CNFs surface was loaded by Sm-TiO2 nanoparticles with a uniform size of about 10nm, existing as anatase. It was concluded from XPS results that Ti element exist as Ti4+ and Sm doping increased the content of absorbed oxygen in composites. The effect of Sm doping on the photocatalytic activity of the Sm-TiO2/CNFs composite was investigated by the photocatalytic degradation of methyl orange aqueous solution under UV irradiation. It was found that Sm doping could improve the photocatalytic property of Sm-TiO2/CNFs effectively compared with the undoped specimen, and the photocatalytic activity of the Sm-TiO2/CNFs samples enhanced firstly and then reduced with Sm content increasing.

Experimental Study on Treatment of Reactive Gaudy Red X-3B Dye Wastewater by Immobilized Fe3+- TiO2 Photocatalytic Oxidation

2011 ◽  
Vol 332-334 ◽  
pp. 1594-1599
Author(s):  
Ya Feng Li ◽  
Wen Tong Chen ◽  
Kai Qi
Keyword(s):  
Photocatalytic Degradation ◽  
Photocatalytic Oxidation ◽  
Ph Value ◽  
Removal Rate ◽  
Experimental Result ◽  
Doping Content ◽  
Dye Wastewater ◽  
Result Show ◽  
Catalyst Content ◽  
Oxidation Reactor

The effect and law of photocatalytic degradation of reactive gaudy red X-3B dye were investigate and the applied process parameters were determined.Using self-synthesized immobilized Fe3+- TiO2 photocatalyst,self-made catalytic oxidation reactor was made to research on reactive gaudy red X-3B dye wastewater by using light source of 20W UV sterilization light.The effects of immobilized Fe3+- TiO2 catalyst content、pH value、Fe3+doping content and adding trace H2O2 on photocatalytic degradation were discussed.The experimental result show that reactive gaudy red X-3B dye wastewater decolorization rate and the removal rate of COD are more than 99% and 90% when the initial reactive gaudy red X-3B dye wastewater concentration was 50mg/L,pH value was 3,input amount of catalyst was 10g/L,Fe3+doping content was 0.5% and the dosage of H2O2 was 0.6mL/L(3%).Immobilized Fe3+- TiO2 photocatalyst can remove the color and persistent organic pollutants in reactive gaudy red X-3B dye wastewater effectively.

Study on Photocatalytic Degradation of MG by PW12-TiO2/SiO2

2014 ◽  
Vol 675-677 ◽  
pp. 448-454
Author(s):  
Xi Quan Wang ◽  
Qi Zhe Yang ◽  
Shi Ying Fan ◽  
Yuan Li
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Catalytic Activity ◽  
Photocatalytic Degradation ◽  
Photocatalytic Oxidation ◽  
Phosphotungstic Acid ◽  
Anatase Phase ◽  
Sol Gel ◽  
High Catalytic Activity ◽  
Composite Oxides

To investigate the photocatalytic degradation of MG by PW12-TiO2/SiO2, in this study PW12-TiO2/SiO2 composite oxides were prepared by sol-gel and hydrothermal strategy. The prepared photocatalysits were characterized by XRD, BET,TEM and EDS techniques and the configuration charateristics of PW12-TiO2/SiO2 nanoparticles were systematically investigated. Photocatalytic activity was checked by the photocatalytic oxidation of MG dye in aqueous solution. The results showed that the phosphotungstic acid still has the Keggin structure. The anatase phase of titanium oxid is identified by XRD. The result of the present work implied that compared with pure TiO2, the PW12-TiO2/SiO2 composite oxides have stronger catalytic activity, good particles dispersion and bigger specific surface area. The optimal concentration of MG was 20mg.L-1, the best dosage of PW12-TiO2/SiO2 was 1g.L-1. Moreover, after three times of recycling, the catalyst still has high catalytic activity.

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