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Zhai Y.,Tianjin Academy of Environmental science | Zhai Y.,Tianjin Sinodour Environmental Protection Science and Technology Development Co. | Feng W.,Tianjin University | Wang Q.,Tianjin University | Ning X.,Tianjin Academy of Environmental science
Catalysis Communications | Year: 2014

Nano-TiO2 was synthesized with titanium sulfate by a simple economical microwave-assisted-hydrolysis method, and it was successfully coated on semi-organic-matter sulfonated coal (SC). SC as a semi-organic matter was first chosen as the substrate of nano-TiO2. Their surface morphology and structure were investigated by scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD). The hybrid nano-composite photocatalyst exhibited a good photocatalytic activity in degrading methylene blue (MB). Results revealed that under the assistance of microwave-process, the anatase TiO2 can be synthesized at low temperature (around 100 °C), presents a strong crystalline and has a good photocatalytic performance. © 2014 Elsevier B.V. Source


Zhai Y.-C.,Tianjin Academy of Environmental science | Zhai Y.-C.,Tianjin Sinodour Environmental Protection Science and Technology Development Co. | Ning X.-Y.,Tianjin Academy of Environmental science | Zhang X.,Tianjin Academy of Environmental science | And 4 more authors.
Xiandai Huagong/Modern Chemical Industry | Year: 2016

TiO2/sulfonated coal photocatalyst composite is prepared by microwave-liquid hydrolysis method using semi-organic sulfonated coal as carrier and titanium sulfate as titanium source. The morphology and composition of TiO2/sulfonated coal photocatalyst composite are characterized by Transmission electron microscopy (TEM), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). The results show that anatase TiO2 with 4.5 nm of particle size is successfully loaded onto sulfonated coal. The effects of microwave time, water bathing time, pH for the liquid hydrolysis on the crystal growth and nucleation are studied. The photocatalysis experiment exhibits that TiO2/sulfonated coal photocatalyst still has high phohtocatalytic activity even after five times of photocatatlytic reaction. © 2016, China National Chemical Information Center. All right reserved. Source


Zhai Z.-X.,Tianjin Academy of Environmental science | Zhai Z.-X.,Tianjin Sinodour Environmental Protection Science and Technology Development Co. | Zou K.-H.,Tianjin Academy of Environmental science | Li W.-F.,Tianjin Academy of Environmental science | And 3 more authors.
Huanjing Kexue/Environmental Science | Year: 2013

To study the pollution characteristics of volatile organic compounds (VOCs) in Tianjin downtown ambient air, 26 sampling points were distributed in Tianjin and systematic sampling was carried out in Spring, Summer, Autumn and Winter, respectively. More than 80 kinds of VOCs were detected which mainly included alkanes, BETX and halohydrocarbon with detection rates of over 80%. The total concentration of VOCs changed with the seasons, in the order of Spring (110.43×10-9)>Autumn (93.73×10-9)>Winter (73.37×10-9)>Summer (60.43×10-9). The result of concentration statistics indicates that the total concentration of VOCs in urban areas was in the range of 30×10-9-90×10-9 and the number of samples in every season in this concentration range accounted for over 50%. There were also differences in the composition of VOCs with the change of seasons in Tianjin. Oxygenated organic compounds and hydrocarbons were the main substances of VOCs and the concentration percentage of them was over 50% in every season. Two main pollutants, BETX and halohydrocarbon, were analyzed for seasonal variation in this paper. Source


Li W.,Tianjin Polytechnic University | Huang L.,Tianjin Academy of Environmental science | Huang L.,Tianjin Sinodour Environmental Protection Science and Technology Development Co. | Zhai Y.,Tianjin Academy of Environmental science | And 4 more authors.
Shiyou Huagong/Petrochemical Technology | Year: 2014

The Cu-Mn/TiO2 and Cu-Mn/γ-Al2O3 catalysts were prepared through impregnation and characterized by means of XRD, N2 adsorption-desorption and SEM. The catalysts were used in the catalytic oxidation of formaldehyde. The effects of Cu-Mn loading, n(Cu):n(Mn), calcination temperature and calcination time on the catalyst activities were investigated by orthogonal experiments. It was found that the effect of the calcination temperature was the biggest and the activity of the Cu-Mn/γ-Al2O3 catalyst was higher than that of the Cu-Mn/TiO2 catalyst. It was found that the Cu-Mn oxides were highly dispersed, and the removal rate of formaldehyde could reach 98.14% under the optimum conditions for the Cu-Mn/γ-Al2O3 catalyst preparation: Cu-Mn loading of 30%(w), n(Cu):n(Mn) 1:4, calcining time 6 h and calcination temperature 500℃. ©, 2014, Beijing Research Institute of Chemical Industry. All right reserved. Source


Huang L.,Tianjin Academy of Environmental science | Huang L.,Tianjin Sinodour Environmental Protection Science and Technology Development Co. | Zhang Y.,Tianjin Academy of Environmental science | Zhang Y.,Tianjin Sinodour Environmental Protection Science and Technology Development Co. | And 7 more authors.
Chinese Journal of Environmental Engineering | Year: 2014

In order to study odors emission characteristics in the methanogenic stage of two-phase anaerobic fermentation of kitchen waste, the continuous pilot-scale two-phase anaerobic fermentation experiments were conducted under mesophilic condition (35℃), using kitchen waste as fermentation substrates. The gases generated in the methanogenic stage were sampled at different time segments during a feeding cycle, odor concentration and component concentration were analyzed. The major odor pollutants were selected according to the threshold dilution of each component. The results show that the odor concentration was above 230 000 when the fermentor ran in steady state. Major odor pollutants are proved to be sulfides, terpenes, oxygenated compounds and aromatic hydrocarbons, among which hydrogen sulfide has the highest concentration of more than 150 mg/m3. The key odorants of the methanogenic stage are sulfides. Hydrogen sulfide makes the greatest contribution, its threshold dilution is more than 260 000, followed by ethyl mercaptan, methyl mercaptan and ethyl thioether, having the threshold dilution of more than 4 000. In addition to these four sulfides, butyraldehyde also makes a relatively large contribution, with the threshold dilution of over 4 000. Source

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