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Wu J.,Shanghai University of Electric Power | Yang S.,Shanghai University of Electric Power | Liu Q.,Shanghai Environment Monitoring Center | He P.,Shanghai University of Electric Power | And 6 more authors.
Environmental Science and Technology | Year: 2016

In the present study, to insert the Cu nanoparticles (NPs) into mesoporous carbon aerogels and first applied it to remove H2S efficiently. This desulfurizer was made based on the dimensional policy by inserting the Cu NPs on mesoporous carbon aerogels to overcome the sintering problem and improve the activity, which has potential performance at high-temperature catalysis. The obtained desulfurizer was employed for H2S removal at middle temperature conditions (optimal H2S adsorption at 550 °C). We explored the optimum doping amount of CuOx, optimum temperature conditions, and the influence of textural parameters of carbon aerogels. The desulfurizers were characterized by means of field-emission scanning electron microscopy (FESEM), N2-adsorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), H2 temperature-programmed reduction (H2-TPR), and Raman spectra techniques. The results confirmed that the presence of H2 was unfavorable for sulfidation and obviously shortened the breakthrough time. However, the existence of CO had little impact on the desulfurization and sulfur capacity. In a nutshell, this work could provide a new synthetic route to prepare Cu NPs deep into the lattice of carbon aerogels structure of desulfurizers and understand the desulfurization mechanism. © 2016 American Chemical Society. Source

Wu S.-J.,Shanghai JiaoTong University | Wu S.-J.,Shanghai Environment Monitoring Center | Huang H.-B.,Key Laboratory of Urban Agriculture South | Huang H.-B.,Shanghai JiaoTong University | And 8 more authors.
Fresenius Environmental Bulletin | Year: 2013

In order to improve the understanding of spatial distribution characteristics of soil phosphorus (P) in villages of an urban agricultural region, the present study focuses on analyzing the three-layer soil samples collected from a peach orchard in the Orchard Village of Nanhui District, Shanghai, China. The spatial distribution of total phosphorus (TP) was examined in the three-layer soil (0-60 cm) using conventional statistical methods and the ordinary Kriging method of geo-statistics. The TP content showed similar degrees of spatial variability in the top (0-20 cm), middle (20-40 cm) and bottom layers (40-60 cm) of the soil profile. The best fit for variogram modelling of TP content in the top soil layer showed the Gaussian model with a strong spatial correlation, whereas those of TP in the middle and bottom soil layers were Gaussian model and exponential model, respectively, with moderate degrees of spatial correlation. The spatial distances of TP in the top, middle and bottom layers of soil were 1714 m, 844 m and 2110 m, respectively. The spatial distribution of TP showed similar patchy patterns in the three layers of the soil. The three-layer soil with low TP content was most widely distributed, covering 2/3 of the peach orchard area, and mainly concentrated in the central and western parts. By comparison, the three-layer soil with the highest TP content covered the smallest area, patchily distributed in the southeast corner of the peach orchard. © by PSP. Source

Huang C.,Tongji University | Huang C.,Shanghai Academy of Environmental Science | Chen C.,Shanghai Academy of Environmental Science | Lou D.,Tongji University | And 4 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2010

The purpose of this study is to simulate transient fuel consumption and gas emissions of a heavy duty diesel vehicle in the real world. A new simulation methodology for heavy duty diesel vehicles was developed based on the principles of power demand and transmission system in real world systems. To validate the methodology, a heavy duty diesel bus was selected to be tested on its business route by using an on-board emission measurement system. The fuel economy was 16.38 L · 100 km-1. NOx, CO and THC emission factors reached 4.44, 3.35, and 1.96 g · km-1, respectively, and the simulated results were generally in accord with the test data. The fuel and emission factors were 1.06 times the test results. The proportions of driving condition under idling, NOx control zone and other zones of the engine map were 32.6%, 7.1% and 60.4%. If we increase the 10t load or speed up the velocity by 1.5 times, the engine load in the NOx control zone will increase to 18.4% and 18.8%, and the fuel and emission level will be 1.5~1.7 times or 1.6~1.8 times the base case. While integrating these two scenarios, the vehicle will be operated under a high stress load. The share of driving conditions under the NOx control zone will be 33.9%, and the fuel and emission level will increase to 2.5~3.0 times correspondingly. The simulation methodology can be utilized to analyze the second-by-second energy consumption and exhaust gas emissions for heavy duty diesel vehicles in the real world. Source

Hu L.,Shanghai University | Dang S.,Shanghai University | Yang X.,Shanghai University | Dai J.,Shanghai Environment Monitoring Center
Microporous and Mesoporous Materials | Year: 2012

The magnetic mesoporous material Fe/CMK-3 acting as a catalyst-sorbent was synthesized by using ordered mesoporous carbon CMK-3 as the supporter, Fe(NO3)3 as the iron source, and glycol as the reducing agent. The samples synthesized were characterized by powder X-ray diffraction (XRD), N2 adsorption-desorption, scanning electron microscope (SEM) and transmission electron microscopy (TEM). The results show that the prepared Fe/CMK-3 preserved the ordered mesoporous structure of CMK-3, and magnetic species was mainly Fe3O4, which was dispersed inside channels of CMK-3 as nanoparticles with the diameter of around 10 nm. The adsorption and catalytic dry oxidation efficiency of the prepared Fe/CMK-3 were determined. The results also show that Fe/CMK-3 had good adsorption performance of phenol in aqueous solution and could be easily separated from water and recycled due to its ferromagnetic nature. Iron oxides supported on CMK-3 were excellent catalysts for dry oxidation of phenol. After 15 adsorption-catalytic oxidation cycles, the phenol adsorption capacity of Fe/CMK-3 only decreased a little, suggesting the good practicality. Combined thermogravimetry and mass spectrum (TG-MS) instrument was used to investigate the catalytic oxidation of phenol on Fe/CMK-3 and the ignition characteristics of the catalyst-sorbent. The supported Fe3O4 was found to be not only the magnetic component but also the active catalyst for the oxidation of phenol. The adsorbed phenol could be oxidized into CO2 and H2O at 220 °C at which no obvious phenol desorption or CMK-3 ignition occurred. © 2011 Elsevier Inc. All rights reserved. Source

Wu S.,Shanghai JiaoTong University | Wu S.,Shanghai Environment Monitoring Center | Zhang H.,Shanghai Environment Monitoring Center | Chen B.,Shanghai Environment Monitoring Center | And 6 more authors.
Journal of AOAC International | Year: 2014

The method for the determination of 12 organophosphorus pesticides in solid waste was established. The organophosphorus pesticides were analyzed by Soxhlet extraction or accelerated solvent extraction (ASE)-SPE cartridge-flame photometric detector (FPD), and leaching solution by rotary oscillation-positive pressure filtration-liquid-liquid extraction-SPE cartridge-FPD. The differences of extraction efficiencies between Soxhlet and ASE were compared. Solvent of Soxhlet extraction, purification and recovery of organophosphorus pesticides in leaching conditions were also studied. The recoveries were 54.2-119.8%, and the average recovery was 87.7%. The RSD was 1.89-9.10% (n = 6), the average RSD was 6.88%, and the detection limit was 0.27-0.69 μg/kg. Source

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