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Wen Z.-H.,Tongji University | Chen L.,Tongji University | Meng X.-Z.,Tongji University | Duan Y.-P.,Tongji University | And 2 more authors.
Science of the Total Environment | Year: 2014

Pharmaceuticals are heavily used to improve human and animal health, resulting in the frequent contamination of aquatic environments with pharmaceutical residues, which has raised considerable concern in recent years. When inadequately removed from drinking water in water treatment plants, pharmaceuticals can have potential toxic effects on human health. This study investigated the spatial distributions and seasonal variations of five pharmaceuticals, including ibuprofen (IBP), ketoprofen (KEP), naproxen (NPX), diclofenac (DFC), and clofibric acid (CA), in the Huangpu River system (a drinking water source for Shanghai) over a period of almost two years as well as the associated risk to human health for different age groups. All of the targets were ubiquitous in the river water, with levels decreasing in the following order: KEP (mean: 28.6 ng/L) ≈ IBP (23.3 ng/L) > DFC (13.6 ng/L) ≈ NPX (12.3 ng/L) > CA (1.6 ng/L). The concentrations of all of the investigated compounds were at the low or medium end of the global range. The upstream tributaries contained lower IBP but higher NPX than did the mainstream and downstream tributaries. However, no significant variations were found in the levels of KEP, DFC, or CA at the different sampling sites. Except for CA in the mainstream, significantly higher pharmaceutical levels were observed in the dry season than in the wet season. Overall, a very low risk of the selected pharmaceuticals for human health via drinking water was observed, but future studies are needed to examine the fate and chronic effects of all pharmaceuticals in aquatic environments. To our knowledge, this is the first report to investigate the human health risk of pharmaceuticals in raw drinking water in China. © 2014 Elsevier B.V.

Chen M.,Tongji University | Yang J.,Tongji University | Yang J.,University of Wollongong | Liu Y.,Fudan University | And 10 more authors.
Journal of Materials Chemistry A | Year: 2015

Highly branched TiO2 interpenetrating network architectures decorated with SnO2 nanocrystals were fabricated through a sacrificial-template approach for selective catalytic reduction of NO with ammonia. Such unique architectures demonstrate outstanding catalytic activity for NO conversion (∼90%), high N2 selectivity (∼100%), good stability and strong resistance to SO2 and H2O poisoning over a broad temperature range (75-325 °C). This journal is © The Royal Society of Chemistry 2015.

Fan J.,Tongji University | Min H.,Tongji University | Sun Y.,Shanghai Tongji Clearon Environmental Protection Equipment Engineering Co. | Zhang Z.,Shanghai Tongji Clearon Environmental Protection Equipment Engineering Co. | And 2 more authors.
Natural Gas Industry | Year: 2015

A CBM power plant is one of the most important ways to utilize CBM, but the exhaust gas from CBM power generation containing a large amount of NOx can cause pollution to the environment, so denitrification is necessary. Because of the high temperature (about 500 ℃) of the exhaust gas, the V2O5/TiO2 cellular catalyst commonly suitable for a coal-fired power plant denitrification can't be used in a CBM power plant. Therefore, on the basis of analyzing the differences between high-temperature exhaust gas from CBM power plants and that from coal power plants, GJ-HC-5 catalyst was developed by nano-fabrication and perfusion methods, and its best temperature range (400-600 ℃) for the NOx removal was found out by lab experiments. In the intermediate test in a CBM power plant, the concentration of NOx monitored continuously dropped from 620 mg/m3 at the inlet of the SCR reactor to 20 mg/m3 at the outlet, indicating a NOx removal rate of over 90%. The experiment results show that the developed high-temperature SCR catalyst, suitable for the exhaust gas temperature and simple in preparation, is a feasible method to remove NOx from high-temperature exhaust gas of CBM power plants. ©, 2015, Natural Gas Industry Journal Agency. All right reserved.

Li D.,Tongji University | Min H.,Tongji University | Jiang X.,Tongji University | Ran X.,Shanghai Tongji Clearon Environmental Protection Equipment Engineering Co. | And 2 more authors.
Journal of Colloid and Interface Science | Year: 2013

The phosphate adsorption is chemical bonding at beginning and followed by physisorption. The present study offers an economic one-pot synthesis of Al-containing ordered mesoporous silica MCM-41 from the coal fly ash. The samples were characterized by small-angle XRD, N2 adsorption, TEM, mapping, 27Al MAS NMR, EDX, and NH3-TPD. The effects of pH values to the final mesostructures have also been investigated. The results show that the material prepared at the pH value of 10 displays the largest pore volume of 0.98cm3/g, the highest BET surface area of 1020m2/g, and the lowest Si/Al molar ratio of 2. Using this material as adsorbent for phosphates, the adsorption capacity reaches 64.2mg/g at 298K, which is much higher than that of large pore mesoporous silica SBA-15 (53.5mg/g), diatomite (62.7mg/g), and MCM-41 (31.1mg/g). In addition, the thermodynamics and kinetics for the phosphate adsorption were also investigated. Our present study shows an economic way to treat phosphates using the industrial solid waste of coal fly ash. © 2013 Elsevier Inc.

Chen W.,Tongji University | Ran X.,Tongji University | Ran X.,Shanghai Tongji Clearon Environmental Protection Equipment Engineering Co. | Jiang X.,Tongji University | And 5 more authors.
Water Environment Research | Year: 2014

The deposit of noble metal on titanium dioxide (TiO2) has been considered as an effective strategy to improve the activity of TiO2. In this study, TiO2 nanoparticles were prepared using a sol-gel route followed by heat treatment at elevated temperatures (573 K, 773 K, and 973 K). TiO2-Pt catalyst (1 wt%) was prepared by depositing Pt on the surface of the prepared TiO2 nanoparticles. TiO2 and TiO 2-Pt were used as heterogeneous catalysts to remove humic acid with UV-light (120 W) illumination. TiO2 prepared at low temperature with smaller particle size and larger specific surface area had stronger activity on humic acid degradation. Deposit of Pt would favor separation of photogenerated charges and enhance the photocatalyst activity, but its coating of the active site also inhibited degradation of humic acid. The addition of H 2O2 enhanced degradation of humic acid for more active oxygen produced. Low pH (pH = 4) was helpful to adsorb humic acid on the surface of TiO2 and, correspondingly, enhance degradation of humic acid (44.4%).

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