Study of the mechanism of removing ultrafine particles using SBA-15

XING Yi; CUI Yong-kang; SU Wei; YIN Li-kun; LIU Ying-shu; LI Zi-yi; LU Pei

doi:10.13374/j.issn2095-9389.2019.04.01.004

Volume 42 Issue 3

Mar. 2020

Turn off MathJax

Article Contents

Article Navigation > Chinese Journal of Engineering > 2020 > 42(3): 313-320

XING Yi, CUI Yong-kang, SU Wei, YIN Li-kun, LIU Ying-shu, LI Zi-yi, LU Pei. Study of the mechanism of removing ultrafine particles using SBA-15[J]. Chinese Journal of Engineering, 2020, 42(3): 313-320. doi: 10.13374/j.issn2095-9389.2019.04.01.004

Citation:

XING Yi, CUI Yong-kang, SU Wei, YIN Li-kun, LIU Ying-shu, LI Zi-yi, LU Pei. Study of the mechanism of removing ultrafine particles using SBA-15[J]. Chinese Journal of Engineering, 2020, 42(3): 313-320. doi: 10.13374/j.issn2095-9389.2019.04.01.004

Citation:

PDF( 1118 KB)

Study of the mechanism of removing ultrafine particles using SBA-15

doi: 10.13374/j.issn2095-9389.2019.04.01.004

XING Yi^{1, 2},
CUI Yong-kang^{1, 2},
SU Wei^{1, 2
,
,},
YIN Li-kun^{1, 2},
LIU Ying-shu^{1, 2},
LI Zi-yi^{1, 2},
LU Pei^{1, 2}

1.
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing 100083, China

More Information

Corresponding author: Email: suwei3007@163.com
Received Date: 2019-04-01
Publish Date: 2020-03-01

Abstract

Abstract

In 2017, China's industrial dust emissions accounted for 7.96 million tons, of which the iron and steel industry contributed approximately 25%. Particulate matter discharged from the iron and steel industry is mostly of a small size, high in temperature, and complex in composition. The mass concentration of ultrafine particles (UFPs) with particle sizes that are less than 0.1 μm is low; however, the proportion of quantity concentration can be as high as 90%. Currently, the commonly used bag filters and electrostatic precipitators are not sufficiently efficient at collecting fine particles. Additionally, owing to the larger specific surface area of fine dust particles, they easily become carriers of adsorbing harmful gases, which has a greater impact on the environment and human health; thus, it is imperative to determine a simple and efficient filtration method to remove ultrafine particles. In this paper, the removal efficiency and mechanism of UFPs (2.5–25 nm) were investigated by using a scanning electromobility particle size spectrometer (SMPS) test system for SBA-15 for different pore sizes. This was done to provide a theoretical basis for the application of mesoporous materials in the control of ultra-low emission of particulate matter in the iron and steel industry. Based on the experimental results and characterization analysis, it is found that a mesoporous filtration medium with a large pore size is more efficient at affecting UFPs entry. There are many affinity sites for UFPs on the inner and outer surfaces of mesoporous materials with a specific pore size. Increasing the complexity of the ends is beneficial for improve the filtration performance of the materials. The presence or absence of nitrogen has little effect on the removal of UFPs. The diffusion effect of UFPs is stronger owing to the existence of mesoporous particles, and the diffusion coefficient is increased when particles enter the pore. Therefore, there is a difference between the theoretical exponent (m= ?2/3) in the traditional model for particle diffusion and the actual diffusion results of UFPs in mesoporous materials.
- iron and steel industry,
- ultrafine particles,
- mesoporous materials,
- diffusion coefficient,
- filtration mechanism

FullText(HTML)

References(19)

References

[1]	段文嬌, 郎建壘, 程水源, 等. 京津冀地區鋼鐵行業污染物排放清單及對PM_2.5影響. 環境科學, 2018, 39(4):1445 Duan W J, Lang J L, Cheng S Y, et al. Air pollutant emission inventory from iron and steel industry in the Beijing-Tianjin-Hebei region and is impact on PM_2.5. Environ Sci, 2018, 39(4): 1445
[2]	仇麗萍. 城市大氣污染物排放清單建立及評估——以南京市為例[學位論文]. 南京: 南京大學, 2015 Qiu L P. Development and Assessment of the City-Scale Emission Inventory of Anthropogenic Air Pollutants: A Case Study of Nanjing[Dissertation]. Nanjing: Nanjing University, 2015
[3]	孫在, 謝小芳, 楊文俊, 等. 煤燃燒超細顆粒物的粒徑分布及數濃度排放特征試驗. 環境科學學報, 2014, 34(12):3126 Sun Z, Xie X F, Yang W J, et al. Size distribution and number emission characteristics of ultrafine particles from coal combustion. Acta Sci Circum, 2014, 34(12): 3126
[4]	張茹, 湯莉莉, 許漢冰, 等. 冬季南京城市大氣氣溶膠吸濕性觀測研究. 環境科學學報, 2018, 38(1):32 Zhang R, Tang L L, Xu H B, et al. Hygroscopic properties of urban aerosol in Nanjing during wintertime. Acta Sci Circum, 2018, 38(1): 32
[5]	Yan P, Pan X L, Tang J, et al. Hygroscopic growth of aerosol scattering coefficient: a comparative analysis between urban and suburban sites at winter in Beijing. Particuology, 2009, 7(1): 52 doi: 10.1016/j.partic.2008.11.009
[6]	何鎵祺, 于興娜, 朱彬, 等. 南京冬季氣溶膠消光特性及霾天氣低能見度特征. 中國環境科學, 2016, 36(6):1645 doi: 10.3969/j.issn.1000-6923.2016.06.008 He J Q, Yu X N, Zhu B, et al. Characteristics of aerosol extinction and low visibility in haze weather in winter of Nanjing. China Environ Sci, 2016, 36(6): 1645 doi: 10.3969/j.issn.1000-6923.2016.06.008
[7]	楊復沫, 歐陽文娟, 王歡博, 等. 大氣顆粒物對能見度影響的研究進展. 工程研究-跨學科視野中的工程, 2013, 5(3):252 doi: 10.3724/SP.J.1224.2013.00252 Yang F M, Ouyang W J, Wang H B, et al. Recent progress in research on impact of atmospheric particulate matters on visibility. J Eng Studies, 2013, 5(3): 252 doi: 10.3724/SP.J.1224.2013.00252
[8]	沈雷, 顧芳, 張加宏, 等. 相對濕度對大氣氣溶膠消光系數的影響. 光散射學報, 2017, 29(3):251 Shen L, Gu F, Zhang J H, et al. The effect of relative humidity on the extinction coefficient of aerosols. J Light Scatt, 2017, 29(3): 251
[9]	范曉慧, 甘敏, 季志云, 等. 燒結煙氣超細顆粒物排放規律及其物化特性. 燒結球團, 2016, 41(3):42 Fan X H, Gan M, Ji Z Y, et al. The rules of super fine particulate emission from sintering flue gas and its physicochemical properties. Sintering Pelletizing, 2016, 41(3): 42
[10]	Wang C S, Otani Y. Removal of nanoparticles from gas streams by fibrous filters: a review. Ind Eng Chem Res, 2013, 52(1): 5 doi: 10.1021/ie300574m
[11]	Kim C, Pui D Y H. Experimental study on the filtration efficiency of activated carbons for 3-30 nm particles. Carbon, 2015, 93: 226 doi: 10.1016/j.carbon.2015.05.048
[12]	Givehchi R, Li Q H, Tan Z C. The effect of electrostatic forces on filtration efficiency of granular filters. Powder Technol, 2015, 277: 135 doi: 10.1016/j.powtec.2015.01.074
[13]	Innocentini M D D M, Coury J R, Fukushima M, et al. High-efficiency aerosol filters based on silicon carbide foams coated with ceramic nanowires. Sep Purif Technol, 2015, 152: 180 doi: 10.1016/j.seppur.2015.08.027
[14]	邢奕, 王驄, 路培, 等. 有序介孔材料過濾脫除納米顆粒物. 環境科學, 2016, 37(12):4538 Xing Y, Wang C, Lu P, et al. Removing nano particles by filtration using materials with ordered mesoporous structure. Environ Sci, 2016, 37(12): 4538
[15]	Lee K W, Gieseke J A. Collection of aerosol particles by packed beds. Environ Sci Technol, 1979, 13(4): 466 doi: 10.1021/es60152a013
[16]	Xing Y, Yu H, Lu P, et al. Experimental research on purifying ultrafine nanoparticle by SBA-15 and its filtration mechanism. Powder Technol, 2018, 330: 32 doi: 10.1016/j.powtec.2018.02.031
[17]	Li J R, Kuppler R J, Zhou H C. Selective gas adsorption and separation in metal–organic frameworks. Chem Soc Rev, 2009, 38(5): 1477 doi: 10.1039/b802426j
[18]	張蕾, 姬亞芹, 李越洋, 等. 鋼鐵冶煉塵兩種采樣方法PM_2.5中元素的比較研究. 中國環境科學, 2018, 38(12):4426 doi: 10.3969/j.issn.1000-6923.2018.12.004 Zhang L, Ji Y Q, Li Y Y, et al. A comparative study on the elements of PM_2.5 in two sampling methods of steel dust. China Environ Sci, 2018, 38(12): 4426 doi: 10.3969/j.issn.1000-6923.2018.12.004
[19]	Kim C, Kang S, Pui D Y H. Removal of airborne sub-3nm particles using fibrous filters and granular activated carbons. Carbon, 2016, 104: 125 doi: 10.1016/j.carbon.2016.03.060