Study on the Photocatalytic Degration of Diesel Pollutants in Seawater by Li+-Doped Nano-TiO2

2013 ◽  
Vol 785-786 ◽  
pp. 459-462
Author(s):  
Ji Yao Guo ◽  
Xiao Cai Yu ◽  
Xiao Xv ◽  
Jin Fang Chen ◽  
Yun Qing Liu
Keyword(s):  
Crystal Structure ◽  
Reaction Time ◽  
Calcination Temperature ◽  
Ph Value ◽  
Removal Rate ◽  
Sol Gel ◽  
Initial Concentration ◽  
Sol Gel Process ◽  
Diesel Degradation

Li+-doped nanoTiO2particles with various amounts of dopant Li+irons have been synthesized by a sol-gel process. The products were characterized by XRD and SEM.Which revealed that the crystal structure of Li+-doped nanoTiO2is anatase, and the nanoparticles diameter was 42nm. Five factous, including dosage of Li+-doped nanoTiO2, initial concentration of diesel, pH value , photocatalytic degradetion reaction time and the presence of H2O2, are considered in the diesel degradation experiments. The results manifest that Li+-doped nanoTiO2can be used as photocatalyst to removal diesel pollutants in seawater effectively. When the ratio of Li+doped into TiO2is 1%wt, the calcination temperature of Li-doped nanoTiO2is 500°C, the dosage of the Li+-doped nanometer TiO2is 0.4g/L, the initial concentration of diesel is 0.2g/L, pH value is 7.0, the reaction time is 2.5h and the H2O2dosage is 0.2g/L, the removal rate of diesel pollutants is up to 88.10%.

Study on the Photocatalytic Degradation of Diesel Pollutants over a Sol-Gel Prepared TiO2

2012 ◽  
Vol 476-478 ◽  
pp. 1926-1929
Author(s):  
Xiao Cai Yu ◽  
Dong Dong Hu ◽  
Qian Du ◽  
Xv Zheng ◽  
Ji Yao Guo
Keyword(s):  
Reaction Time ◽  
Photocatalytic Degradation ◽  
Room Temperature ◽  
Ph Value ◽  
Removal Rate ◽  
Sol Gel ◽  
Initial Concentration ◽  
Five Factors ◽  
Degradation Reaction ◽  
Diesel Degradation

Nanoscale titanium dioxide (TiO2) has been fabricated through a sound sol-gel method at room temperature with Tetra-n-butyl Titanate as the precursor, and the particles are characterized by XRD and TEM techniques. The results manifest that the as-prepared TiO2 is amorphous with the anatase structure and its size is around 33.2nm. Five factors, including dosage of TiO2, initial concentration of diesel, pH value, photocatalytic degradation reaction time and the presence of H2O2, are considered in the diesel degradation experiments. An orthogonal test is carried out to optimize the photocatalytic degradation of diesel pollutants based on the single-factor experiments. It reveals that when the dosage of TiO2 is 1.0g/L, the initial concentration of diesel is 0.5g/L, pH value is 6, the reaction time is 4h and the H2O2 dosage is 0.09%, the removal rate of diesel pollutants can up to 88%. Besides, the influence of each factor on removing diesel can be arranged in decreasing order: initial concentration of diesel> photocatalytic reaction time> pH value> TiO2 dosage> H2O2 dosage.

Photocatalytic Degradation of Diesel Pollutants in Seawater by Using Nano Li-Doped Zinc Oxide under Visible Light

2014 ◽  
Vol 609-610 ◽  
pp. 317-323
Author(s):  
Xiao Cai Yu ◽  
Dong Dong Hu ◽  
Jin Fang Chen ◽  
Yu Ying Wu ◽  
Xu Zheng
Keyword(s):  
Zinc Oxide ◽  
Reaction Time ◽  
Visible Light ◽  
Calcination Temperature ◽  
Ph Value ◽  
Removal Rate ◽  
Orthogonal Experiment ◽  
Initial Concentration ◽  
Five Factors ◽  
Doped Zno

Zinc Oxide (ZnO) is a potential semiconductor as photocatalyst. Nevertheless, its main absorbance wavelength is in the range of UV light, which consist only a small proportion of solar. In order to utilizing the large proportion of solar light, pure ZnO and Li-doped ZnO nanoparticles with different Li loading (1.0, 2.0, 3.0 and 4.0 at%) and various calcination temperature (300, 500, 700, 900°C) were synthesized through a co-precipitation method and characterized by XRD and TEM techniques. The photocatalytic abilities of photocatalysts are evaluated in simulated experiments of removing diesel pollutants in seawater under visible illumination. Six factors, Li loadings, calcination temperature, dosage of photocatalyst, reaction time, diesel initial concentration, and pH value of seawater, were taken into consideration in the process of phtotcatalytic degradation of diesel experiments under visible light. An orthogonal experiment was implemented to investigate the best combination of five factors (the factor of reaction time was excluded) which can lead to the highest diesel removal rate. The characterization of as-prepared nano-particles showed that Li element was doped into ZnO, and all particles were of hexagonal wurtzite structure. The average crystal sizes of Li-doped ZnO with various calcination temperature (300, 500, 700 and 900°C) are 15.03, 25.97, 48.63 and 55.48nm, respectively, and consequently, higher calcination temperature will contribute to the aggregation of particles. Doping Li appropriately can improve the photocatalystic ability of ZnO under visible light, which can deduce from the single-factor experiments. Calcination temperature is also an evident factor to affect the photocatalytic ability of photocatalyst. The influence order of factors in decreasing order can also be obtain through the orthogonal experiment and the result was as follows: calcination temperature > Li loading ≈ pH value > initial concentration of diesel > photocatalyst dosage. The best combination of the five factors is as follows, the dosage of catalyst 2.5g/L, initial concentration of diesel 1.5g/L, Li loading of catalyst 1.0 at%, calcinations temperature 900oC and pH value 8.25, the removal rate of diesel pollutants in seawater is expected to reach 77.31%.

Study on the Photocatalytic Degradation of Diesel Pollutants in Seawater by a Stannum- Doped Nanometer Titania

2011 ◽  
Vol 197-198 ◽  
pp. 780-785 ◽  
Author(s):  
Xiao Cai Yu ◽  
Qian Du ◽  
Peng Fei Zhu ◽  
Dong Dong Hu ◽  
Li Yang
Keyword(s):  
Reaction Time ◽  
Photocatalytic Degradation ◽  
Calcination Temperature ◽  
Ph Value ◽  
Removal Rate ◽  
Sol Gel ◽  
Transition Metal Ions ◽  
Experimental Conditions ◽  
Calcination Temperatures ◽  
Degradation Reaction

TiO2 can be used as a photocatalyst because of its semiconductor property. When TiO2 is doped with transition metal ions, its electronic properties may be modified. In this work, nanosized Sn4+-doped TiO2 (TiO2-Sn4+) particles have been synthesized by a sol-gel process at different temperature. Their microstructure and crystal structure depending on the calcination temperatures were investigated using XRD and SEM techniques. The photocatalytic degradation of diesel pollutants in seawater was investigated by using Sn4+-doped nanometer TiO2 under UV irradiation. In the experiment, the effect of different ratio of Sn4+ doped into TiO2, the effect of calcination temperature of Sn-doped nano-TiO2, the effect of Sn4+-doped nanometer TiO2 dosage, pH value and photocatalytic degradation reaction time, respectively, on the removal of diesel pollutants in seawater was investigated. On the basis of the results of these experimental data, the optimal experimental conditions for photocatalytic degradation of diesel are tried through the orthogonal test. The results reveal that when the ratio of Sn4+ doped into TiO2 was 3% wt, the calcination temperature of Sn-doped nano-TiO2 was 400°C, the Sn4+-doped nanometer TiO2 dosage was 1 g/L, pH value was 8 and photocatalytic degradation reaction time was 1.5h, respectively, the removal rate of diesel pollutants in seawater was expected to reach 88.00 %.

Study on the Photocatalytic Degradation of Diesel Pollutants in Seawater by a Prepared Nano Ag-Droped Zinc Oxide

2014 ◽  
Vol 609-610 ◽  
pp. 311-316
Author(s):  
Xiao Cai Yu ◽  
Dong Dong Hu ◽  
Jin Fang Chen ◽  
Xiao Jie Jin ◽  
Xu Zheng
Keyword(s):  
Reaction Time ◽  
Photocatalytic Degradation ◽  
Calcination Temperature ◽  
Ph Value ◽  
Uv Light ◽  
Removal Rate ◽  
Orthogonal Experiment ◽  
Influential Factors ◽  
Influential Factor ◽  
Sonochemical Method

ZnO and Ag-droped ZnO photocatalysts with different Ag loadings (0.5, 1.0, 1.5, 2.0at%) and different calcination temperature (300, 400, 500, 600, 700°C) were synthesized by a sonochemical method. The morphology and crystal pattern of some prepared catalysts were characterized by XRD and SEM techniques which demonstrated that the prepared catalysts were of hexagonal wurtzite structure. Ag loadings, calcination temperature and other factors, dosage of photocatalyst, reaction time and pH value of seawater, were also taken into consideration in the procedure of photocatalytic degradation reaction under UV light. An orthogonal experiment was carried out to investigate the best combination of factors which can reach the best diesel pollution removal rate and the influence order of factors. Reaction time and dosage of catalyst were the most influential factors in this experiment, and the factor of calcination temperature was the weakest influential factor. The removal rate of diesel can up to 78% when the experiment was undertaken under the very conditions: the dosage of catalyst 2.0g/L, reaction time 2.0h, Ag loading of catalyst 1.0 at%, calcinations temperature 400°C and pH value 8.5.

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 %.

The Removal of High NH3-N Concentration in Landfill Leachate by Chemical Precipitation

2011 ◽  
Vol 281 ◽  
pp. 305-308
Author(s):  
Wei Hua Song ◽  
Jun Yin ◽  
Yu Wang
Keyword(s):  
Crystal Structure ◽  
Reaction Time ◽  
Landfill Leachate ◽  
Ph Value ◽  
Removal Rate ◽  
Chemical Precipitation ◽  
Municipal Landfill ◽  
N Concentration

The municipal landfill leachate concentration was 1670mg / L, NH3-N in leachate was fomed MgNH4PO4· 6H2O crystal precipitation by adding MgSO4 · 7H2O and Na2HPO4 · 12H2O. pH value, reaction timeand chemical dosage ratio was discussed. The results shows that the suitable reaction pH value is between 8 and 9.When PH value is too high, the crystal structure would bedest- ructed,it will make the fixed ammonia escaped from MgNH4PO4. Mg2+: NH4+: PO43-= 1.4:1:1.4 is the best choise under the conditions of pH 8.5, reaction time =20 min.The concentration of NH3-N in leachate was decreased from 1671Mg / L to 175Mg / L,the removal rate reaches to 98.5%.

Photocatalytic Degradation of Ammonia Nitrogen in Aquaculture Wastewater by Using Nano-TiO2

2011 ◽  
Vol 197-198 ◽  
pp. 774-779
Author(s):  
Peng Fei Zhu ◽  
Xiao Cai Yu ◽  
Qian Du ◽  
Kui Sheng Song ◽  
Zhong Hua He
Keyword(s):  
Reaction Time ◽  
Photocatalytic Degradation ◽  
Volume Concentration ◽  
Volume Fraction ◽  
Ph Value ◽  
Removal Rate ◽  
Sol Gel ◽  
Ammonia Nitrogen ◽  
Experimental Conditions ◽  
Aquaculture Wastewater

The nano-TiO2photocatalyst was prepared via sol-gel method, and the crystal structure and surface morphology were characterized by XRD and SEM. The photocatalytic degradation of ammonia-N in aquaculture wastewater was investigated by using nano-TiO2under UV irradiation. In the experiment, the effect of nano-TiO2dosage, ammonia-N initial concentration, pH value, H2O2volume concentration, and reaction time, respectively, on the removal of ammonia-N was investigated. On the basis of the results of these experimental data, an orthogonal array experimental design was used to select more efficient degradation condition. The optimal experimental conditions for photocatalytic degradation of ammonia-N can be stated as follows: when the concentration of ammonia-N was 20 mg/L, nano-TiO2catalyst dosage was 1.2 g/L, the pH value of solution was 5, H2O2volume fraction was 4 %, respectively, if the reaction time may last 3 h, the removal rate of ammonia-N was expected to reach 92.10 %.

Study on Treatment of M-Cresol Wastewater Using Potassium Ferrate(VI)

2012 ◽  
Vol 610-613 ◽  
pp. 2367-2371 ◽  
Author(s):  
Ming Zhong Hu ◽  
Zhen He Shi ◽  
Hong Yan Zhao
Keyword(s):  
Reaction Time ◽  
Ph Value ◽  
Removal Rate ◽  
Cod Removal ◽  
Potassium Ferrate ◽  
Optimum Conditions ◽  
Initial Concentration ◽  
Cod Removal Rate

The effects of the oxidation of potassium ferrate and the flocculation on cresol wastewater water were evaluated. This research aimed at determining the optimum conditions for the COD removal rate duing cresol wastewater water process. The results showed that potassium ferrate dosage of 1.1g/L, the pH value of 5, reaction time 15min, m-cresol initial concentration of 200 mg/L were the optimum conditions. Under the optimum conditions, COD removal rate was over 67%.

Study on the Photocatalytic Degradation of Diesel Pollutants in Seawater by a Sonochemically Prepared Nano Zinc Oxide

2012 ◽  
Vol 476-478 ◽  
pp. 1939-1942 ◽  
Author(s):  
Dong Dong Hu ◽  
Xiao Cai Yu ◽  
Min Zhang ◽  
Ji Yao Guo ◽  
Xv Zheng
Keyword(s):  
Reaction Time ◽  
Photocatalytic Degradation ◽  
Ph Value ◽  
Removal Rate ◽  
Hexagonal Wurtzite Structure ◽  
Sonochemical Method ◽  
Initial Concentration ◽  
Nano Zinc Oxide ◽  
Pollutants Removal ◽  
Nano Zinc

Semiconductor ZnO nanocrystal has been synthesized by a sonochemical method and characterized by XRD and SEM techniques. The results indicate that the as-prepared ZnO is of hexagonal wurtzite structure. The photocatalytic degradation of diesel pollutants in seawater is investigated by utilization of ZnO in simulated diesel-polluted seawater exposed to UV irradiation. In the experiment, the influences of ZnO dosage, initial concentration of diesel, pH value, photocatalytic degradation reaction time and the presence of assistance oxidant peroxide, respectively, on the diesel pollutants removal from seawater are investigated. A systematic optimization study is carried out through a orthogonal test on the basis of the results of the single-factor experiments. It reveals that when the experiment is undertaken under the very condition: the ZnO dosage is 1g/L, the initial concentration of diesel 1g/L, the pH value 7, the reaction time 3h and the concentration of peroxide 0.16%, the removal rate of diesel pollutants in seawater is expected to reach 84 %.

Removal of Nonylphenol from Water by Ozone

2013 ◽  
Vol 859 ◽  
pp. 357-360 ◽  
Author(s):  
Xiao Dong Wang ◽  
Yang Lv ◽  
Meng Meng Li ◽  
Hong Ye Liu
Keyword(s):  
Reaction Time ◽  
Ozone Concentration ◽  
Degradation Rate ◽  
Ph Value ◽  
Removal Rate ◽  
Affecting Factors ◽  
Initial Concentration ◽  
Lower Temperature ◽  
Better Than

This study investigates the degradation of Nonylphenol. The degradation affecting factors including solution ozone dosage, initial concentration, pH, temperature and ultraviolet. The results indicated that when the ozone contents changes, the Nonylphenols degradation rate changes as well. The higher ozone concentration contribute to the faster degradation; With the increase of initial concentration of Nonylphenol, the removal rate of it decrease on the contrary, while with the initial concentration increases, the quality of unit ozone degradation of Nonylphenol is ascenting and then tend to a constant; The remove rate of Nonylphenol is improving when the pH value vary from 4.86~10.34. The effect of Nonylphenols ozonation in higher temperatures is better than it is in lower temperature; Ultraviolet radiation is also favorable for the removal of Nonylphenol as it can shorten the reaction time as well as reduce the amount of ozone.

Sign in / Sign up

Export Citation Format

Share Document