Shanghai Tongji Clearon Environmental Protection Equipment Engineering Co.

Shanghai, China

Shanghai Tongji Clearon Environmental Protection Equipment Engineering Co.

Shanghai, China
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Fan J.,Tongji University | Xu H.,Tongji University | Lv M.,Tongji University | Wang J.,Fudan University | And 7 more authors.
New Journal of Chemistry | Year: 2017

Palladium-copper (PdCu) alloy has been proved to be a promising electrocatalyst for the reduction of nitrate. The challenges, however, include how to design this catalyst with controllable particle sizes, uniform distribution, and avoiding the leakage and reducing the consumption of noble metals. Herein, we report the synthesis of a mesoporous carbon supported PdCu bimetallic electrocatalyst by using mesoporous silica SBA-15 as the hard template. The PdCu nanoparticles are uniformly embedded in the ordered mesoporous carbon (OMC) framework (PdCu@OMC), leading to a high loading amount of PdCu alloy of ∼22.41 wt%, a large specific surface area of 1091 m2 g−1 and a pore volume of 0.74 cm3 g−1. Significantly, the resultant PdCu@OMC composites deliver superior electrocatalytic capability in 50 mL mixed solution (500 mg of nitric nitrogen per liter) under neutral conditions, with a nitrate conversion yield of 28.7% and a nitrogen selectivity of 74%. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.


Fan J.,Tongji University | Fan J.,Fudan University | Jiang X.,Tongji University | Min H.,Tongji University | And 10 more authors.
Journal of Materials Chemistry A | Year: 2014

A facile synthetic method was adopted to prepare heterogeneous catalysts using ordered mesoporous silica SBA-15 as matrix, ceria as auxiliary and Cu-Mn as the catalytic active sites, denoted as Cu-Mn/CeO2/SBA-15. Characterization results demonstrate that the metal oxide nanoparticles are well-dispersed inside the mesopores rather than aggregated outside the surface. The particle sizes range from 4.1 to 11.2 nm with an increase in calcination temperature from 300 to 500 °C. The presence of ceria plays a significant role in the formation of well-dispersed metal oxide nanoparticles, and a possible mechanism for the preparation of this heterogeneous catalyst is proposed based on comparable experimental results. Catalytic degradation studies for advanced oxidation processes (AOPs) show that Cu-Mn/CeO2/SBA-15 catalysts can efficiently degrade (>99%) high-concentration dye pollutants (C = 2 g L-1) within 210 min at 70 °C and can retain a good degradation efficiency even at a pH value of 7 when using Rhodamine B as the model pollutant. The excellent AOP catalytic performance could be ascribed to the well-dispersed catalytic nanoparticles inside the mesopores and the catalytic synergic effect of CeO2. Our work here displays a simple method to synthesize heterogeneous catalyst with well-dispersed nano-sized catalytic active sites for AOPs by using CeO2 as the auxiliary agent. © 2014 the Partner Organisations.


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.


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 Company Ltd | 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.


Min H.,Tongji University | Ran X.,Tongji University | Fan J.,Tongji University | Fan J.,Fudan University | And 7 more authors.
Journal of Materials Chemistry A | Year: 2015

Heterogeneous catalysts which show high catalytic performance, structural stability, and low toxicity, are greatly required to efficiently degenerate organic pollutants in waste water in advanced oxidation processes (AOPs). In this paper, a mesoporous Cu-Mn/TiO2 composite heterogeneous catalyst was successfully prepared, which has a stable crystalline TiO2 mesostructure as the support, and well-dispersed Cu-Mn oxides as the catalytic active sties. Its Cu, Mn content is measured to be 5.7 and 6.0 wt%, and the BET surface area is measured to be 97 m2 g-1 with a pore size of ∼6.0 nm and pore volume of 0.15 cm3 g-1. Using the prepared Cu-Mn/TiO2 composite as an AOPs catalyst for the degeneration of Acid Red 1, it can efficiently (>99%) degenerate the model pollutant in water within only 90 min. Compared with homogeneous catalysts, it can retain its catalytic performance over a wide pH range (3-9) and can be recycled for at least five times while still possessing the decolorization efficiency of 89%. By analyzing the catalytic process, a possible catalytic procedure for the degradation of Acid Red 1 has been proposed. Furthermore, using bulk Cu-Mn oxides, Cu-Mn/P25, and Cu-Mn/SBA-15 as reference catalysts, we propose that the excellent catalytic performance of Cu-Mn/TiO2 could be ascribed to the anatase mesoporous TiO2, which not only offers a stable matrix with high surface area for Cu-Mn catalysts, but also serves as a type of catalytic promoter for the synergistic catalytic degeneration of Acid Red 1. © The Royal Society of Chemistry 2015.


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%).


Patent
Tongji University and Shanghai Tongji Clearon Environmental Protection Equipment Engineering Co. | Date: 2016-06-08

The present invention relates to a field of control of nitrogen oxide pollution, and involves a high-efficient catalyst for denitration at low temperature and preparation method thereof, which comprises the steps: (1) preparing aqueous solution of cerium nitrate; (2) soaking mesoporous silica materials SBA-15 with aqueous solution from step (1), after stirring, filtrating, washing and drying; (3) calcining materials from step (2) to obtain evenly dispersed CeO_(2)-SBA-15 materials; (4) preparing ethanol solution of manganese nitrate; (5) soaking CeO_(2)-SBA-15 materials from step (3) with ethanol solution of manganese nitrate from step (4) and volatilizing ethanol, washing and drying; (6) calcining materials from step (5) to obtain evenly distributed Mn_(x)O_(y)/CeO_(2)-SBA-15 catalyst for denitration; The preparation method has simple process with lower cost, and the obtained Mn_(x)O_(y)/CeO_(2)-SBA-15 catalyst has uniform and ordered pores, large specific area, narrow pore size distribution, well dispersity of catalytic components, high catalytic activity, better effect of denitration at low temperature range and wider temperature range available for denitration.


Patent
Tongji University and Shanghai Tongji Clearon Environmental Protection Equipment Engineering Co. | Date: 2016-09-26

A honeycomb denitration catalyst used for flue gas at 400 C.-600 C. and preparation method thereof. The honeycomb denitration catalyst includes a catalyst coating and a honeycomb ceramic, where a slurry of the catalyst coating is made from components having the following mass percentages: 15%-25% of a zeolite, 5%-10% of a -alumina, 5%-10% of a catalyst auxiliary agent, 5% of a binder, and 50%-70% of deionized water. The honeycomb ceramic is soaked repeatedly into the slurry of the catalyst coating. After the soaking is completed, the obtained product is dried and calcined to obtain the honeycomb denitration catalyst. The honeycomb denitration catalyst contains a catalyst auxiliary agent and has excellent denitration activity at high temperatures, sulphur-resistance and water-tolerance ability, stability and NO_(x )removing ability.


PubMed | CAS Guangzhou Institute of Geochemistry, Tongji University and Shanghai Tongji Clearon Environmental Protection Equipment Engineering Co.
Type: | Journal: The 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 (1.6ng/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.

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