Search

Your search keyword '"Jiang, Boqiong"' showing total 129 results
Start Over Author "Jiang, Boqiong"
129 results on '"Jiang, Boqiong"'

17. Analyses and Simulations of PM 2.5 Pollution Characteristics under the Influence of the New Year's Day Effects in China.

Author

Shi, Qiao, Hou, Tangyan, Wang, Chengli, Song, Zhe, Yao, Ningning, Sun, Yuhai, Jiang, Boqiong, Li, Pengfei, Wang, Zhibin, and Yu, Shaocai

Subjects
NEW Year, ATMOSPHERIC water vapor, HUMAN activity recognition, ATMOSPHERIC aerosols, INDUSTRIAL pollution, POLLUTION
Abstract

Regional haze often occurs after the New Year holiday. To explore the characteristics of PM2.5 pollutions under the influence of the New Year's Day effect, this study analyzed the spatiotemporal changes relating to PM2.5 during and around the New Year's Day holiday in China from 2015 to 2022, and used the Weather Research and Forecasting-Community Multiscale Air Quality (WRF-CMAQ) model to study the effects of human activities and meteorological factors on PM2.5 pollutions, as well as the differences in the contributions of different industries to PM2.5 pollutions. The results show that for the entire study period (i.e., before, during, and after the New Year's Day holiday) from 2015 to 2022, the average concentrations of PM2.5 in China decreased by 41.9% overall. In 2019~2022, the New Year's Day effect was significant, meaning that the average concentrations of PM2.5 increased by 18.9~46.8 μg/m3 from before to after the New Year's Day holiday, with its peak occurring (64.3~74.9 μg/m3) after the holiday. In terms of spatial differences, the average concentrations of PM2.5 were higher in the Beijing–Tianjin–Hebei region, the Yangtze River Delta, and central China. Moreover, the Beijing–Tianjin–Hebei region and its surrounding areas, the Chengdu–Chongqing region, the Fenwei Plain, and the middle reaches of the Yangtze River region were greatly affected by the New Year's Day effect. Human activities led to higher increases in PM2.5 in Henan, Hubei, Hebei, and Anhui on 3 and 4 January 2022. If the haze was accompanied by cloudy days or weak precipitation, the accumulation of surface water vapor and atmospheric aerosols further increased the possibility of heavy pollution. It was found that, for the entire study period, PM2.5 generated by residential sources contributed the vast majority (60~100 μg/m3) of PM2.5 concentrations, and that the main industry sources that caused changes in time distributions were industrial and transportation sources. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

31. Highly efficient decomposition of toluene using a high-temperature plasma-catalysis reactor

Author

Yao, Shuiliang, primary, Chen, Zhizong, additional, Xie, Han, additional, Yuan, Yuchen, additional, Zhou, Ruowen, additional, Xu, Bingqing, additional, Chen, Junxia, additional, Wu, Xinyue, additional, Wu, Zuliang, additional, Jiang, Boqiong, additional, Tang, Xiujuan, additional, Lu, Hao, additional, Nozaki, Tomohiro, additional, and Kim, Hyun-Ha, additional

Published
2020
Full Text
View/download PDF

40. Mechanism of NH3Selective Catalytic Reduction Reaction for NOxRemoval from Diesel Engine Exhaust and Hydrothermal Stability of Cu–Mn/Zeolite Catalysts

Author

Cheng, Min, Jiang, Boqiong, Yao, Shuiliang, Han, Jingyi, Zhao, Shuang, Tang, Xiujuan, Zhang, Jiawei, and Wang, Ting

Abstract

Zeolite-supported catalysts are effective in selective catalytic reduction (SCR) of NOxfrom the diesel engine exhaust, whereas the reaction mechanism remains unclear. In this work, in situ diffuse reflectance infrared Fourier transform (in situ DRIFT) spectroscopy was used to investigate the SCR reaction mechanism on Cu–Mn/ZSM-5 and Cu–Mn/SAPO-34. Langmuir–Hinshelwood (L-H) and Eley–Rideal (E-R) reaction mechanisms were both involved in the SCR reaction. In the L-H reaction mechanism, NO2and NH4+were two important intermediates. The transformation of bidentate nitrates to monodentate nitrates, and further to NO2, played an important role. The amount of bidentate nitrates and monodentate nitrates on Cu–Mn/ZSM-5 was much less than that on Cu–Mn/SAPO-34. It led to less NO removal through the L-H reaction mechanism on Cu–Mn/ZSM-5. The formation and consumption of coordinated NH3, as the intermediate in the E-R reaction mechanism, was similar on both catalysts. Therefore, the different catalytic activities between the two catalysts should be mainly due to the L-H reaction mechanism, the main mechanism at low temperature. The hydrothermal aging treatment significantly reduced the amount of NH4+and NOxcomplexes on Cu–Mn/ZSM-5, and the variation of the SCR reaction through the L-H mechanism was also the main reason for different hydrothermal stabilities of the two catalysts.

Published
2024
Full Text
View/download PDF

45. Variations of polycyclic aromatic hydrocarbons in ambient air during haze and non-haze episodes in warm seasons in Hangzhou, China.

Author

Lu, Hao, Wang, Shengsheng, Wu, Zuliang, Yao, Shuiliang, Han, Jingyi, Tang, Xiujuan, and Jiang, Boqiong

Subjects
HAZE -- Environmental aspects, POLYCYCLIC aromatic hydrocarbons, AIR pollution, PARTICULATE matter, INHALATION injuries
Abstract

To investigate the characteristics of polycyclic aromatic hydrocarbons (PAHs) during haze episodes in warm seasons, daily PM and gaseous samples were collected from March to September 2015 in Hangzhou, China. Daily samples were further divided into four groups by the definition of haze according to visibility and relative humidity (RH), including non-haze (visibility, >10 km), light haze (visibility, 8-10 km, RH <90 %), medium haze (visibility, 5-8 km, RH <90 %), and heavy haze (visibility, <5 km, RH <90 %). Significantly higher concentrations of PM-bound PAHs were found in haze days, but the mean PM-bound PAH concentrations obviously decreased with the aggravation of haze pollution from light to heavy. The gas/particle partitioning coefficients of PAHs decreased from light-haze to heavy-haze episodes, which indicated that PM-bound PAHs were restricted to adhere to the particulate phase with the aggravation of haze pollution. Absorption was considered the main mechanism of gas/particle partitioning of PAHs from gaseous to particulate phase. Analysis of air mass transport indicated that the PM-bound PAH pollution in haze days was largely from regional sources but also significantly affected by long-range air mass transport. The inhalation cancer risk associated with PAHs exceeded the acceptable risk level markedly in both haze and non-haze days. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

47. Stability of Cu–Mn bimetal catalysts based on different zeolites for NOxremoval from diesel engine exhaust

Author

Zhao, Shuang, Huang, Liming, Jiang, Boqiong, Cheng, Min, Zhang, Jiawei, and Hu, Yijing

Abstract

Cu–Mn bimetal catalysts were prepared to remove nitrogen oxides (NOx) from diesel engine exhaust at low temperatures. At a Cu/Mn ratio of 3:2, the NOxconversions at 200 °C reached 65% and 90% on Cu–Mn/ZSM-5 and Cu–Mn/SAPO-34, respectively. After a hydrothermal treatment and reaction in the presence of C3H6, the activity of Cu–Mn/SAPO-34 was more stable than that of Cu–Mn/ZSM-5. No obvious variations in the crystal structure or dealumination were observed, whereas the physical structure was best maintained in Cu–Mn/SAPO-34. The atomic concentration of Cu on the surface of Cu–Mn/SAPO-34 was quite stable, and the consumption of octahedrally coordinated Cu2+could be recovered. Conversely, the proportion of octahedrally coordinated Cu2+on the surface of Cu–Mn/ZSM-5 significantly decreased. Therefore, besides the structure, the redox cycle between Cu+and octahedrally coordinated Cu2+played an important role in the stability of the catalysts.

Published
2018
Full Text
View/download PDF

48. One-pot template-free synthesis, growth mechanism and enhanced photocatalytic activity of monodisperse (BiO)(2)CO3 hierarchical hollow microspheres self-assembled with single-crystalline nanosheets

Author

Dong, Fan, Zheng, Anmin, Sun, Yanjuan, Fu, Min, Jiang, Boqiong, Ho, Wing-Kei, Lee, S.C., Wu, Zhongbiao, Dong, Fan, Zheng, Anmin, Sun, Yanjuan, Fu, Min, Jiang, Boqiong, Ho, Wing-Kei, Lee, S.C., and Wu, Zhongbiao

Abstract

This work presents a one-pot template-free synthesis, detailed characterization, growth mechanism and application of well-defined uniform monodisperse (BiO)(2)CO3 hierarchical hollow microspheres self-assembled with single-crystalline nanosheets. The synthesis was conducted by hydrothermal treatment of bismuth citrate and sodium carbonate in water. Time-dependent evolutions of phase structure, composition, and morphology were investigated systematically and revealed that the growth mechanism of such novel structures involved a unique multistep pathway. First, near amorphous particles were produced through reaction, nucleation, crystallization, and aggregation processes. Then, stacked embryos of intermediate (BiO)(4)CO3(OH)(2) microspheres with attached particles were produced due to dissolution and recrystallization. Subsequently, stacked uniform solid microspheres with small particles attached on edges were generated by the consumption of particles through Ostwald ripening. The stacked microspheres further grew to form monodisperse hierarchical microspheres with a hole in the center, like flower buds. Finally, uniform monodisperse (BiO)(2)CO3 hierarchical hollow microspheres were produced through layers splitting. The aggregation of the self-assembled nanosheets contributed to the formation of 3D hierarchical architecture containing mesopores, which is favorable for efficient reactants transport and photo-energy harvesting. Furthermore, the band gap structure of (BiO)(2)CO3 was revealed by the experimental method combined with density functional theoretical calculation. As expected, the novel (BiO)(2)CO3 hierarchical hollow microspheres exhibited enhanced photocatalytic activity due to the special hierarchical morphology, exceeding that of (BiO)(2)CO3 particles and commercial P25. The as-prepared uniform (BiO)(2)CO3 microspheres with well-defined hierarchical hollow structures are also ideal candidates for investigating their architecture-dependent performances in

Published
2012

Catalog

Books, media, physical & digital resources
See catalog results