Removal of Bisphenol A from Water by Ozone

2013 ◽  
Vol 864-867 ◽  
pp. 155-160 ◽  
Author(s):  
Xiao Dong Wang ◽  
Yang Lv ◽  
Hong Ye Liu ◽  
Meng Meng Li
Keyword(s):  
Reaction Time ◽  
Bisphenol A ◽  
Degradation Rate ◽  
Ph Value ◽  
Removal Rate ◽  
Affecting Factors ◽  
Initial Concentration ◽  
Lower Temperature ◽  
Better Than

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

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.

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.

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 %.

Degrading Dynamics of Brilliant Blue in Soils and River Sediment

2012 ◽  
Vol 518-523 ◽  
pp. 3138-3141
Author(s):  
Yong Xia Hou ◽  
Xiao Jun Hu ◽  
Hui Ying Li ◽  
Xin Xin Li ◽  
Yan Wang
Keyword(s):  
Degradation Rate ◽  
River Sediment ◽  
Brilliant Blue ◽  
Affecting Factors ◽  
Soil Sterilization ◽  
Initial Concentration ◽  
Chemical Industrial Park ◽  
Research Objects ◽  
C 30

Abstract. The research objects were the soils along the river and river sediment of the fourth Liuhe river in Nanjing chemical industrial park. Degrading dynamics of brilliant blue in soils and river sediment and its affecting factors were studied through soil sterilization, the control of temperature and initial concentration of brilliant blue. The degradation rate of brilliant blue in non-sterilized soils and river sediment was respectively 1.010-1.023 times and 1.019-1.051 times of that in sterilized soils and river sediment in 45 d. The degradation quality of brilliant blue in soils and river sediment by microorganism was 0.010-0.029 and 0.021-0.057 mg•kg-1. The half-live in non-sterilized treatment was shorter than that in sterilized treatment. In the range of (10±1)°C-(30±1) °C, the degradation of brilliant blue was accelerated with temperature enhancing. At (30±1)°C, the residual quantity of brilliant blue in soils and river sediment was 0.612 and 0.601 mg•kg-1, the residual quantity and the half-live were both smallest.

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%.

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 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 %.

Disposal of 3.5-dinitro-benzoicacid Wastewater by Semi-Coke/Ozone Combined Technology

2014 ◽  
Vol 997 ◽  
pp. 732-735
Author(s):  
Nan Nan Dang ◽  
Hui Wu Cai ◽  
Jin Meng Zhu
Keyword(s):  
Reaction Time ◽  
Benzoic Acid ◽  
Removal Rate ◽  
Catalytic Ozonation ◽  
Flow Temperature ◽  
Initial Concentration ◽  
Maximum Value ◽  
Effects Of Ph ◽  
Cod Removal Rate ◽  
Better Than

The effects of pH, initial concentration, ozone flow, temperature and semi-coke dosage on 3.5-dinitro-benzoic acid wastewater in the process of carbocoal catalytic ozonation are investigated. The results show that: the removal rate of COD increases with the rise of ozone flow and reaction time in a certain range; temperature has little effect on the removal rate of COD; the removal rate of COD achieve the maximum value when the pH is about 12; the COD removal rate of carbocoal catalytic ozonation is obviously better than single ozonation.

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%.

Heteropolyacid Photocatalytical Degradation of Atrazine in Aqueous Solution under UV-Irradiation

2013 ◽  
Vol 652-654 ◽  
pp. 1680-1683
Author(s):  
Wei Yang Shen ◽  
Fei Ye Liu ◽  
Jian Qiu Chen ◽  
Rui Xin Guo
Keyword(s):  
Aqueous Solution ◽  
Organic Compounds ◽  
Uv Irradiation ◽  
Degradation Rate ◽  
Ph Value ◽  
Degradation Products ◽  
Affecting Factors ◽  
Obvious Effect ◽  
Initial Concentration ◽  
Temperature Exposure

The photodegradation of atrazine induced by UV-irradiation in aqueous solution was investigated initially. The affecting factors on the photodetradation were studied and described in details such as atrazine initial concentration, temperature, pH value, exposure intensity, oxidant and co-existing substances. It was found that the atrazine initial concentration had no obvious effect on the photodegradation. With the pH value increasing, photodegradation rates decreased. However, we also observed a positive correlation between the degradation rate of atrazine and temperature, exposure intensity and oxidant while the coexisting organic compounds may decelerate photodegradation of the atrazine in water. In this paper, the degradation products had also been confirmed by using LC-MS.

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