Aerosol and Air Quality Research最新文献_第10页

Effects of Synthesis Conditions on Rare Earth Doped Iron Oxide Catalyst for Selective Catalytic Reduction of NOx with NH3 稀土掺杂氧化铁催化剂合成条件对NH3选择性催化还原NOx的影响

IF 4 4区环境科学与生态学

Aerosol and Air Quality Research Pub Date : 2023-01-01 DOI: 10.4209/aaqr.220438

Ying Wei, Bingquan Wang, Ruiyi Ren, Rui Wang

{"title":"Effects of Synthesis Conditions on Rare Earth Doped Iron Oxide Catalyst for Selective Catalytic Reduction of NOx with NH3","authors":"Ying Wei, Bingquan Wang, Ruiyi Ren, Rui Wang","doi":"10.4209/aaqr.220438","DOIUrl":"https://doi.org/10.4209/aaqr.220438","url":null,"abstract":"A series of rare earth-doped Fe-based oxide catalysts were prepared by co-precipitation method as Selective Catalytic Reduction (SCR) catalysts. The effects of the various rare earth species, doping amount of Sm, calcination temperature and the kind of precipitant on the deNO x activity of the catalysts were systematically investigated. The SO 2 resistance performance was tested on the optimal catalyst. The catalysts have been characterized by X-ray diffraction (XRD), The X-ray photoelectron spectra (XPS), scanning electron microscopy (SEM) and Brunner Emmet Teller (BET). The results showed that the doping of Sm significantly improves the removal efficiency of Fe-based oxides. Sm 0.075 Fe 0.925 catalyst showed the optimal deNO x performance and excellent resistance to SO 2 . At the optimal doping rate (0.075), the denitrification rate was close to 100% between 200 and 250 ° C. The calcination temperature has a significant effect on the catalyst. The order of catalytic activity for different calcination temperatures was 350 ° C ≈ 400 ° C > 450 ° C > 500 ° C. The Sm 0.075 Fe 0.925 achieved 100% the de-NOx efficiencies at calcination temperatures of 350–400 ° C. It was also found that the deNO x performance of the catalyst prepared by using NH 3 ·H 2 O as the precipitating agent was better than the catalyst prepared by using (NH 3 ) 2 CO 3 or NaOH as the precipitating agent. Normally a small amount of SO 2 would render the catalyst inactive, but the Sm 0.075 Fe 0.925 catalyst was basically regenerated after 0.05% SO 2 removal in this resistance test.","PeriodicalId":7402,"journal":{"name":"Aerosol and Air Quality Research","volume":"13 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70295972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Novel Sustainable Semiconductor/Metal-organic Framework Coated Electret Filter for Simultaneous Removal of PM2.5 and VOCs 一种新型可持续半导体/金属有机框架涂层驻极体过滤器，用于同时去除PM2.5和VOCs

IF 4 4区环境科学与生态学

Aerosol and Air Quality Research Pub Date : 2023-01-01 DOI: 10.4209/aaqr.220445

Yu Zhang, Zan Zhu, Wei-Ning Wang, S. Chen

引用次数: 1

Do the Street Sweeping and Washing Work for Reducing the Near-ground Levels of Fine Particulate Matter and Related Pollutants? 扫街和洗街对减少近地细颗粒物及相关污染物水平有效吗?

IF 4 4区环境科学与生态学

Aerosol and Air Quality Research Pub Date : 2023-01-01 DOI: 10.4209/aaqr.220338

Sheng-Lun Lin, Yunzhou Deng, M. Lin, Shih-Wei Huang

{"title":"Do the Street Sweeping and Washing Work for Reducing the Near-ground Levels of Fine Particulate Matter and Related Pollutants?","authors":"Sheng-Lun Lin, Yunzhou Deng, M. Lin, Shih-Wei Huang","doi":"10.4209/aaqr.220338","DOIUrl":"https://doi.org/10.4209/aaqr.220338","url":null,"abstract":"This research focuses on the properties of near-ground fine particles (PM 2.5 ), ultrafine particles (UFP), black carbon (BC), and polycyclic aromatic hydrocarbons (PAHs) in traffic area. The effects of street sweeping and washing on pollutant levels are evaluated. The X Road with sewage ditch was selected for the stationary samplings to determine the differences between the atmospheric PM 2.5 mass concentration, their composition, and potential sources before/after street cleaning processes, as well as the effect of the sewage existence. Results show that there were certain reductions of PM 2.5 after the street washing, especially for the road section with drainage ditch. The chemical mass balance model then pointed out the traffic contribution on PM 2.5 significantly reduced on the downwind site (from 25.7% to 16.5%). Besides, the spatial distribution of the near-ground PM 2.5 , UFP, BC, and PAHs were monitored by a mobile platform on an appropriate long, straight, and not heavily traffic Road Y. The monitoring took place at 1 h-before, during washing/sweeping, at 1 h-after, at 1 d-after, at 2 d-after three cleaning strategies, including only sweeping, washing-before-sweeping, and sweeping-before-washing. The monitoring then mapped out the hot spot distribution of pollutants. The PM 2.5 mass, UFP number, BC, and PAH concentrations before the street sweeping is 155 µ g m –3 , 1.2 × 104 # cm –3 , BC 3633 ng m –3 , and 36 ng m –3 . The UFP number concentration of suspended particles after street washing had a trend to reduce, avoided the deterioration of air quality. The strategy, “sweeping-before-washing”, was the best operation method among three to suppress the UFP number concentration by 42%, while all three strategies could effectively reduce the PAH levels. The primary pollutants are more easily reduced by the street-cleaning process, while the secondary one did not.","PeriodicalId":7402,"journal":{"name":"Aerosol and Air Quality Research","volume":"1 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70294243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Emission Characteristics, OFPs, and Mitigation Perspectives of VOCs from Refining Industry in China's Petrochemical Bases 中国石化基地炼油行业VOCs排放特征、OFPs及减排前景

IF 4 4区环境科学与生态学

Aerosol and Air Quality Research Pub Date : 2023-01-01 DOI: 10.4209/aaqr.220347

G. Hini, Kexin Gao, Yi Zheng, Maimaiti Simayi, S. Xie

{"title":"Emission Characteristics, OFPs, and Mitigation Perspectives of VOCs from Refining Industry in China's Petrochemical Bases","authors":"G. Hini, Kexin Gao, Yi Zheng, Maimaiti Simayi, S. Xie","doi":"10.4209/aaqr.220347","DOIUrl":"https://doi.org/10.4209/aaqr.220347","url":null,"abstract":"China's petroleum refining industry has set off another climax and has entered a new rapid development by building seven petrochemical bases. Sector-based volatile organic compound (VOC) emissions from the refining industry in seven petrochemical-developed provinces in China were estimated for 1990–2019 and projected for 2020–2030 under the business-as-usual (BAU), new policy control (NPC), and the highest control (HC) scenarios. Furthermore, speciated VOCs and their ozone formation potentials (OFP) were estimated in 2019. Total VOC emissions from existing refineries were 541.14 Gg in 2019, of which 43.9%, 31.3%, 18.3%, and 6.6% were from fugitive, end-of-pipe, tank storage, and wastewater treatment sources, respectively. Alkanes were the most dominant compound in refineries, accounting for 55.2% of total emissions, followed by alkenes (18.9%) and aromatics (12.5%). Alkenes were the highest contributor to OFP, accounting for 59.5% of total OFP, followed by alkanes (22.3%) and aromatics (13.7%). n-Butane, ethylene, cis-2-Butene, n-Decane, and n-Pentane were the top five species with the highest emissions, accounting for approximately 50% of total emissions. Whilst, ethylene, cis-2-Butene, n-Pentane, n-Butane, and m/p-Xylene were the top five species with the highest contribution to OFPs, accounting for approximately 78% of total OFPs. In 2030, 741.03 and 165.28 Gg more VOC will be released than in 2019 under a non-control condition and the BAU scenario. It is estimated that 75.05 and 228.67 Gg of VOC from all refineries can be reduced under the NPC 2030 and the HC 2030 scenarios. To effectively reduce VOC emissions from refining industries, priority should be given to fugitive emissions by improving and upgrading the production processes and implementing enhanced leak detection and Repair system. More efficient control technologies should be invented for end-of-pipe sources. Vapor recovery systems and secondary seals have great potential for VOC emission reduction from storage tanks.","PeriodicalId":7402,"journal":{"name":"Aerosol and Air Quality Research","volume":"1 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70294640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

VOC Emissions from a Rendering Plant and Evaluation for Removal of Pentanal by Oxidization Using Hydrogen Peroxide 某冶炼厂挥发性有机化合物排放及过氧化氢氧化法去除戊二醛的评价

IF 4 4区环境科学与生态学

Aerosol and Air Quality Research Pub Date : 2023-01-01 DOI: 10.4209/aaqr.220440

W. Cheng, Chun-Hung Lin, C. Yuan, K.L. Chang

{"title":"VOC Emissions from a Rendering Plant and Evaluation for Removal of Pentanal by Oxidization Using Hydrogen Peroxide","authors":"W. Cheng, Chun-Hung Lin, C. Yuan, K.L. Chang","doi":"10.4209/aaqr.220440","DOIUrl":"https://doi.org/10.4209/aaqr.220440","url":null,"abstract":"Rendering plants treat dead livestock and produce grease and bone meal. In a rendering plant, the cooking and drying processes are the main sources of odor emissions. Non-fresh dead livestock reduce the performance of odor control devices, and in Taiwan, the treatment facilities in a rendering plant mostly are operated in a batch feeding, which causes volatile organic compound (VOC) emissions in the exhausted gas, that always caused complaints from the nearby neighborhood. This study used respectively ozone and hydrogen peroxide to evaluate the removal efficiencies of pentanal, hexanal and toluene those are common VOCs in the rendering exhaustion. Experimental results indicated that ozone could not effectively reduce aldehydes and toluene, and the residual ozone remaining in the exhaust gas is a secondary air pollutant and irritate the human respiratory tracts. Oppositely, hydrogen peroxide effectively removed pentanal as a feasible VOC treatment oxidant by adding into a contact reactor. When the pentanal exhaustion concentration from the rendering process was around 36.23 ppm in the flue with the flow rates from 100 to 250 Nm 3 min –1 , the reaction rate constant of pentanal for the first-order reaction by aqueous hydrogen peroxide of 1,000 mg L –1 was obtained as 0.536 1 s –1 , and then the pentanal reduced to 0.68 to 2 ppm. Based on the simulation using the Gaussian dispersion model, the concentration ranges of pentanal in the exhausted stream resulted in the pentanal emission rate lower than 0.01 g s –1 , which no longer causes surrounding residents’ complaints.","PeriodicalId":7402,"journal":{"name":"Aerosol and Air Quality Research","volume":"1 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70296024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Health Risk Assessment of Volatile Organic Compounds for Children in Indoor Air, Ulaanbaatar, Mongolia 室内空气中挥发性有机化合物对儿童健康的风险评估，乌兰巴托，蒙古

IF 4 4区环境科学与生态学

Aerosol and Air Quality Research Pub Date : 2023-01-01 DOI: 10.4209/aaqr.230028

Oyun-Erdene Otgonbyamba, G. Ganbat, Ser-Od Khuyag, Enkhjargal Altangerel, Bilguun Ganbold, Altangadas Bayanjargal, Altangerel Bat-Erdene, Bataa Chuluunbaatar, B. Badrakh, S. Batbaatar

{"title":"Health Risk Assessment of Volatile Organic Compounds for Children in Indoor Air, Ulaanbaatar, Mongolia","authors":"Oyun-Erdene Otgonbyamba, G. Ganbat, Ser-Od Khuyag, Enkhjargal Altangerel, Bilguun Ganbold, Altangadas Bayanjargal, Altangerel Bat-Erdene, Bataa Chuluunbaatar, B. Badrakh, S. Batbaatar","doi":"10.4209/aaqr.230028","DOIUrl":"https://doi.org/10.4209/aaqr.230028","url":null,"abstract":"This study presents levels of volatile organic compounds (VOCs) measured indoors for the first time in Ulaanbaatar, Mongolia, and quantifies the health risk for children emphasizing the urgent need to improve control for indoor VOCs sources. The 583 samples collected at 144 sites, including new buildings, old apartments, schools, workplaces, kindergartens, baishin, and Mongolian traditional gers , hospitals, schools, and shopping centers are analyzed. Formaldehyde was detected in 95.7% of the samples, while benzene was in 24.2%. The levels of benzene, toluene, and xylene in new and old buildings and apartments exceed the recommended values of AGÖF for volatile organic compounds in indoor air. The probabilistic Monte Carlo simulation method was used to estimate the risk exposure of four types of VOCs (benzene, formaldehyde, toluene, and m,p-xylene) to the health of the study population. The risk of cancer for benzene and formaldehyde is high in the age group of 7 months–4 years, m,p-xylene, and toluene show non-cancer risk in this age group.","PeriodicalId":7402,"journal":{"name":"Aerosol and Air Quality Research","volume":"1 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70296727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of Non-linear Relationship of PM2.5 Mass Concentration with Aerosol Extinction Coefficient and RH in Hefei, China 合肥地区PM2.5质量浓度与气溶胶消光系数和相对湿度的非线性关系分析

4区环境科学与生态学

Aerosol and Air Quality Research Pub Date : 2023-01-01 DOI: 10.4209/aaqr.230139

Yinan Chen, Shiguo Zhang, Yonghua Wu, Kee Yuan, Jian Huang, Dongfeng Shi, Shunxing Hu

{"title":"Analysis of Non-linear Relationship of PM2.5 Mass Concentration with Aerosol Extinction Coefficient and RH in Hefei, China","authors":"Yinan Chen, Shiguo Zhang, Yonghua Wu, Kee Yuan, Jian Huang, Dongfeng Shi, Shunxing Hu","doi":"10.4209/aaqr.230139","DOIUrl":"https://doi.org/10.4209/aaqr.230139","url":null,"abstract":"Optical remote sensing of PM2.5 concentration complements ground-based in situ sampler observations and depends on aerosol extinction-to-mass conversion and meteorological factors. Based on Mie scattering theory, we derived a non-linear analytical expression among the PM2.5 mass concentration, aerosol extinction coefficient, and hygroscopic factor. We analyzed 1-year data of aerosol size distribution, PM2.5, visibility, and relative humidity (RH) and refined the exponential factors for improving PM2.5 estimated from the aerosol extinction coefficient in Hefei, China. Aerosol size distribution data on adjacent days were used to approximate the hygroscopic factors of the aerosols. The measured PM2.5 in 2020 was used to refine the exponential factors relevant to the large aerosol extinction coefficient and RH in the analytical function. Next, we evaluated the derived PM2.5 from aerosol extinction with the tapered element oscillating microbalance (TEOM), which independently observed PM2.5 in January 2021; their comparisons indicated good consistency and strong correlation with a linear correlation coefficient of R2=0.76. Finally, by applying the analytical function of PM2.5 and aerosol extinction, we obtained the spatial and vertical distribution of PM2.5 from the NASA/CALIPSO-observed aerosol extinction profiles, which showed reasonable agreement and good correlation with the TEOM-measured PM2.5 in several major cities in Anhui Province, China.","PeriodicalId":7402,"journal":{"name":"Aerosol and Air Quality Research","volume":"318 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135059410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of Aerosol Acidity Based on a Direct Measurement Method and a Chemical Thermodynamic Model 基于直接测量法和化学热力学模型的气溶胶酸度比较

4区环境科学与生态学

Aerosol and Air Quality Research Pub Date : 2023-01-01 DOI: 10.4209/aaqr.230096

Qinping Song, Kazuo Osada

引用次数: 0

New Insights into the Synergistic Effect on Condensable Particulate Matter Based on the Formation, Characteristics and Removal 基于可冷凝颗粒物形成、特征和去除的协同效应新见解

4区环境科学与生态学

Aerosol and Air Quality Research Pub Date : 2023-01-01 DOI: 10.4209/aaqr.230145

Wenting Liu, Xin Wang, Bowen Zhao, Jianyi Lu

引用次数: 0

Composition Analysis of Airborne Microbiota in Outdoor and Indoor Based on Dust Separated by Micro-sized and Nano-sized 基于微、纳米粉尘分离的室内外空气微生物群组成分析

IF 4 4区环境科学与生态学

Aerosol and Air Quality Research Pub Date : 2023-01-01 DOI: 10.4209/aaqr.210231

Jinho Yang, J. Seo, Y. Jee, Yoon Kim, J. Sohn

{"title":"Composition Analysis of Airborne Microbiota in Outdoor and Indoor Based on Dust Separated by Micro-sized and Nano-sized","authors":"Jinho Yang, J. Seo, Y. Jee, Yoon Kim, J. Sohn","doi":"10.4209/aaqr.210231","DOIUrl":"https://doi.org/10.4209/aaqr.210231","url":null,"abstract":"Airborne microorganisms are associated with human health and awareness of the important influence of nano-sized extracellular vesicles (EVs) on health has risen. Thus, we analyzed the micro-sized microbes (m-MBs) and nano-sized microbial EVs (n-MEVs) of outdoor and indoor air through a field study in Seoul, Korea. We conducted 16S rDNA-based metagenomic analysis of m-MBs and n-MEVs in outdoor airborne dust (OAD), indoor airborne dust (IAD), and indoor dust from carpets (IDC). The dominant taxa in OAD were altered depending upon the outside environment, such as sunny, haze, and rainy. Also, dominant taxa in IAD and IDC were changed depending on the outside environment. In addition, there were differences of microbiome composition and diversity between the m-MB and n-MEV in OAD, IAD, and IDC. m-MB in OAD were more correlated with that of IDC, whereas n-MEVs in OAD were more related to those in IAD. Thus, indoor bioaerosols can be affected by different source according to bioaerosol size. Additionally, risk of bioaerosols can be different according to dominant taxa, and therefore we suggested that further study for risk of dominant taxa according to environments is necessary. We suggested that nano-sized microbial EVs should be included as parameters to manage air quality","PeriodicalId":7402,"journal":{"name":"Aerosol and Air Quality Research","volume":"40 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70290545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0