Article
Environmental Sciences
Heather L. Runberg, Brian J. Majestic
Summary: The formation of humic-like substances (HULIS) from the photolysis of polycyclic aromatic hydrocarbons (PAH) is influenced by the production of hydroxyl radicals (OH). Although OH is an important factor for HULIS formation, pathways that do not involve OH can also contribute to the formation of HULIS from PAH.
ATMOSPHERIC ENVIRONMENT
(2022)
Article
Engineering, Environmental
Emma L. D'Ambro, Noora Hyttinen, Kristian H. Moller, Siddharth Iyer, Rasmus Otkjaer, David M. Bell, Jiumeng Liu, Felipe D. Lopez-Hilfiker, Siegfried Schobesberger, John E. Shilling, Alla Zelenyuk, Henrik G. Kjaergaard, Joel A. Thornton, Theo Kurten
Summary: This study presents chamber-based measurements of Delta 3-carene oxidation products and develops an oxidation mechanism based on computational methods. The research shows the presence of highly oxidized organic molecules during Delta 3-carene oxidation, and highlights the importance of alkoxy bond scission and hydrogen abstraction from methyl groups in HOM formation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Chemical
Yayang Tian, Xike Tian, Wenbin Zeng, Yulun Nie, Chao Yang, Chu Dai, Yong Li, Liqiang Lu
Summary: The introduction of selenium into graphitic carbon nitride (g-C3N4) can enhance its performance in activating peroxymonosulfate (PMS), leading to more efficient degradation of organic pollution caused by antibiotics. The Se-doped g-C3N4 (Se-g-C3N4) showed a significant increase in degradation rate compared to bulk g-C3N4, attributed to the enhanced PMS decomposition and electron transfer process. This work provides a new strategy for improving the PMS activation performance of g-C3N4 by regulating electron distribution and increasing exposure of reactive sites.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Review
Chemistry, Organic
Stephy Elza John, Ramya Tokala, Venkata Rao Kaki, Nagula Shankaraiah
Summary: The phenanthrene nucleus, extensively present in natural products, not only has pharmaceutical value but also plays a crucial role in the development of dyes, plastics, pesticides, and explosives. Over the past two decades, researchers have been actively exploring various synthetic strategies to access this important nucleus, driving continuous advancements in the field.
ASIAN JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Environmental Sciences
Zhezheng Ding, Yayi Yi, Wenxing Wang, Qingzhu Zhang
Summary: Chrysene, a recalcitrant polycyclic aromatic hydrocarbon, undergoes atmospheric degradation initiated by OH radical, generating toxic oxygenated and nitro products. The study reveals the rate constant and atmospheric lifetime of chrysene in reaction with OH radical.
Article
Environmental Sciences
Xiaoqing Wu, Qifeng Hou, Jiabin Huang, Jiajue Chai, Feng Zhang
Summary: In this study, the reaction kinetics of styrene + OH were extensively studied using high-level quantum chemical methods combined with RRKM/master equation simulations. The total rate coefficient for styrene + OH was calculated to be 1.7 x 10-11 cm3 molecule-1 s-1 at 300 K, 1 atm. The main products were identified as add beta (88.2%), add5 (6.9%), add alpha (1.9%) and add3 (1.7%), with an estimated atmospheric lifetime of 8.0 hours for styrene.
Article
Engineering, Environmental
Yixin Huang, Jing Zou, Jinbin Lin, Haoyu Yang, Mengyun Wang, Jiawen Li, Wei Cao, Baoling Yuan, Jun Ma
Summary: This study discovers that 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) can serve as both an activator and an electron shuttle to enhance the activation of peroxydisulfate (PDS) and enhance the degradation of diclofenac (DCF). The PDS/ABTS system generates multiple reactive species, with ABTS(center dot+) and (OH)-O-center dot directly contributing to the degradation of DCF. The PDS/ABTS system shows good anti-interference capacity and further improved performance can be achieved by encapsulating ABTS into cellulose.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Organic
Xue-Qi Zhou, Pei-Bo Chen, Qiang Xia, Ting-Kai Xiong, Xue-Jun Li, Ying-Ming Pan, Mu-Xue He, Ying Liang
Summary: 3,4-Dihydroquinolone is an important drug and biological compound. Electrochemical cyclization with phenanthrene as a reducing mediator improves the selectivity of the reaction.
ORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Environmental Sciences
Yan Li, Rui Ming Zhang, Xuefei Xu
Summary: This study provides a detailed theoretical kinetics investigation on the Z-6-(4-OH, 1-OO)-ISOPOO radical chemistry, which is the key to understanding the OH recycling mechanism in isoprene oxidation. The pressure dependence of the fate of Z-6-(4-OH, 1-OO)-ISOPOO radical is found to be significant at combustion temperatures, and the involvement of multi-structural torsional anharmonicity and tunneling is crucial for accurate kinetics calculations. The study also reveals a two-stage behavior of critical species and estimates the shortest half-lives of Z-6-(4-OH, 1-OO)-ISOPOO radical under different conditions.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2023)
Article
Engineering, Environmental
Pin Wang, Lingjun Bu, Lu Luo, Yangtao Wu, Weiqiu Zhang, Shiqing Zhou, John C. Crittenden
Summary: In this study, a novel kinetic model was developed to enrich the elementary reactions related to transformation products (TPs) in advanced oxidation processes (AOPs). The entire reaction pathways from parent organic compounds to TPs were mapped using density functional theory (DFT). The predicted concentrations of nitro-TPs obtained from the model matched previous research results, confirming the accuracy of the predictions. This research highlights the effectiveness of combining DFT and kinetic modeling in understanding TP formation and decay mechanisms in AOPs.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Food Science & Technology
Mingyu Li, Mingyue Shen, Jingnan Lu, Jun Yang, Yousheng Huang, Lei Liu, Heyu Fan, Jianhua Xie, Mingyong Xie
Summary: This review summarizes the formation of harmful Maillard reaction products in dairy products during thermal processing, focusing on the occurrence, analysis methods, and inhibition of AGEs formation. It highlights the importance of monitoring and controlling the quality of dairy products.
FOOD RESEARCH INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Qing Ye, Matthew B. Goss, Gabriel Isaacman-VanWertz, Alexander Zaytsev, Paola Massoli, Christopher Lim, Philip Croteau, Manjula Canagaratna, Daniel A. Knopf, Frank N. Keutsch, Colette L. Heald, Jesse H. Kroll
Summary: The atmospheric oxidation of dimethyl sulfide (DMS) is a significant natural source of sulfate particles, affecting the global radiative effect of aerosols. The study focuses on understanding the chemistry of intermediate organic sulfur species, including hydroperoxymethyl thioformate. Chamber experiments revealed rapid decay of many organic sulfur species, indicating the importance of aerosol uptake and surface loss processes.
ACS EARTH AND SPACE CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Annie M. Rahmatika, Youhei Toyoda, Tue Tri Nguyen, Kiet Le Anh Cao, Tomoyuki Hirano, Takeo Kitamura, Yohsuke Goi, Yuko Morita, Takashi Ogi
Summary: In this study, nanostructured 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO)-oxidized cellulose nanofiber (TOCN) particles were successfully prepared via a spray-drying process without changing their chemical functionalization. The particles exhibited a high zeta-potential value and porous structure formation through solvent polarity control, leading to good adsorption capacity.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Chemistry, Physical
Feng Wang, Chenggen Yang, Yaocheng Shi, Lei Yu
Summary: A novel oxidative deoximation method utilizing NHPI as a co-catalyst was developed in this study, which can utilize air as an oxidant under mild reaction conditions in a green solvent. The activation of the catalytic organoselenium species was found to be essential for the reaction process, with potential application in pharmaceutical industry due to the transition metal-free process.
MOLECULAR CATALYSIS
(2021)
Article
Construction & Building Technology
Jing Li, Suhong Yin, Haoliang Huang, Jie Hu, Chaofan Yi, Zheng Chen, Yuwei Ma, Guang Ye, Qijun Yu
Summary: This study investigates the relationship between the reaction products and drying shrinkage of alkali-activated slag (AAS) with varying hydroxide dosage. The results show that adding Mg(OH)2 improves the shrinkage resistance of AAS, while adding Al(OH)3 does not alleviate the drying shrinkage. The drying shrinkage scales of different synthetic products also vary.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Environmental Sciences
Muhammad Waqas, Majid Nazeer, Man Sing Wong, Wu Shaolin, Li Hon, Joon Heo
Summary: The socio-economic restriction measures implemented in the United States have significantly reduced nitrogen dioxide (NO2) emissions. The study highlights the impact of factors such as human mobility, population density, income, climate, and stationary sources on the reduction of NO2 at different stations. The research emphasizes the scientific impacts of the NO2 reduction and income inequality revealed by the pandemic on air quality and health disparities.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Guorui Zhi, Jinhong Du, Aizhong Chen, Wenjing Jin, Na Ying, Zhihui Huang, Peng Xu, Di Wang, Jinghua Ma, Yuzhe Zhang, Jiabao Qu, Hao Zhang, Li Yang, Zhanyun Ma, Yanjun Ren, Hongyan Dang, Jianglong Cui, Pengchuan Lin, Zhuoshi He, Jinmin Zhao, Shuo Qi, Weiqi Zhang, Wenjuan Zhao, Yingxin Li, Qian Liu, Chen Zhao, Yi Tang, Peng Wei, Jingxu Wang, Zhen Song, Yao Kong, Xiangzhe Zhu, Yi Shen, Tianning Zhang, Yangxi Chu, Xinmin Zhang, Jiafeng Fu, Qingxian Gao, Jingnan Hu, Zhigang Xue
Summary: An comprehensive emission inventory for China in 2019, which includes both air pollutants and greenhouse gases, was developed in this study. The inventory utilizes existing frameworks and data to provide comparable emissions data and demonstrates the relationship between emissions and economic development.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
I-Ting Ku, Yong Zhou, Arsineh Hecobian, Katherine Benedict, Brent Buck, Emily Lachenmayer, Bryan Terry, Morgan Frazier, Jie Zhang, Da Pan, Lena Low, Amy Sullivan, Jeffrey L. Collett Jr
Summary: Unconventional oil and natural gas development (UOGD) in the United States has expanded rapidly in recent decades, raising concerns about its impact on air quality. This study conducted extensive air monitoring during the development of several large well pads in Broomfield, Colorado, providing a unique opportunity to examine changes in local air toxics and VOC concentrations during well drilling and completions and production. The study identified significant increases in VOC concentrations during drilling operations, highlighting the importance of emissions from synthetic drilling mud. The findings suggest opportunities to mitigate emissions during UOGD operations.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Puji Lestari, Akbar R. Tasrifani, Wiranda I. Suri, Martin J. Wooster, Mark J. Grosvenor, Yusuke Fujii, Vissia Ardiyani, Elisa Carboni, Gareth Thomas
Summary: This study developed field emission factors for various pollutants in peatland fires and estimated the total emissions. Gas samples were collected using an analyzer, while particulate samples were collected using air samplers. The study found significant emissions of CO2, CO, PM2.5, carbon aerosols, water-soluble ions, and elements from the fires in Central Kalimantan, Indonesia in 2019.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Ligang Li, Yuyu Chen, Lu Fan, Dong Sun, Hu He, Yongshou Dai, Yong Wan, Fangfang Chen
Summary: A high-precision retrieval method based on a deep convolutional neural network and satellite remote sensing data is proposed to obtain accurate methane vertical profiles.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Hyung Joo Lee, Toshihiro Kuwayama, Michael Fitzgibbon
Summary: This study investigated the changes in nitrogen dioxide (NO2) air pollution levels and their disparities in California, U.S. during the pandemic of coronavirus disease 2019 (COVID-19). The results showed a decrease in NO2 concentrations, especially in urban and high-traffic areas. However, socially vulnerable populations still experienced higher levels of NO2 exposure. The study suggests that reducing NO2 disparities, particularly racial inequity, can be achieved through continued regulatory actions targeting traffic-related NOx emissions.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Maria Chiara Pietrogrande, Beatrice Biffi, Cristina Colombi, Eleonora Cuccia, Umberto Dal Santo, Luisa Romanato
Summary: This study investigates the chemical composition and oxidative potential of PM10 particles in the Po Valley, Italy, and demonstrates the impact of high levels of atmosphere ammonia. The rural area had significantly higher ammonia concentrations compared to the urban site, resulting in higher levels of secondary inorganic aerosol. Although the SIA components did not contribute significantly to the PM10 oxidative reactivity, they were correlated with the oxidative potential measurements. This suggests that the contribution of SIA to PM oxidative toxicity cannot be ignored.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Natalie Allen, Jan Gacnik, Sarrah M. Dunham-Cheatham, Mae Sexauer Gustin
Summary: Accurate measurement of atmospheric reactive mercury is challenging due to its reactivity and low concentrations. The University of Nevada, Reno Reactive Mercury Active System (RMAS) has been shown to be more accurate than the industry standard, but has limitations including long time resolution and sampling biases. Increasing the sampling flow rate negatively affected RM concentrations, but did not impact the chemical composition of RM captured on membranes.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Chin-Yu Hsu, Wei-Ting Hsu, Ching-Yi Mou, Pei-Yi Wong, Chih-Da Wu, Yu-Cheng Chen
Summary: This study estimated the daily exposure concentrations of PM2.5 for elderly individuals residing in different regions of Taiwan using land use regression with machine learning (LUR_ML) and microenvironmental exposure (ME) models. The accuracy of the models varied across regions, with the ME models exhibiting higher predictions and lower biases. The use of region-specific microenvironmental measurements in the ME model showed potential for accurate prediction of personal PM2.5 exposure.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Xiaohan Si, Kerrie Mengersen, Chuchu Ye, Wenbiao Hu
Summary: This study found that there is an interactive effect between air pollutants and weather factors, which significantly affects influenza transmission. Future research should consider the interactive effects between pollutants and temperature or humidity to evaluate the environment-influenza association.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Luxi Xu, Ruijun Xu, Yunshao Ye, Rui Wang, Jing Wei, Chunxiang Shi, Qiaoxuan Lin, Ziquan Lv, Suli Huang, Qi Tian, Yuewei Liu
Summary: This study aimed to evaluate the impact of ambient air pollution on hospital admissions for angina. The results showed that exposure to ambient particulate matter, sulfur dioxide, nitrogen dioxide, carbon monoxide, and ozone are associated with an increased risk of hospital admissions for angina. The association with nitrogen dioxide exposure was found to be the strongest.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Xinyu Yu, Man Sing Wong, Majid Nazeer, Zhengqiang Li, Coco Yin Tung Kwok
Summary: This study proposes a novel method to address the challenge of missing values in satellite-derived AOD products and creates a comprehensive daily AOD dataset for the Guangdong-Hong Kong-Macao Greater Bay Area. By reconstructing missing values and developing a new model, the derived dataset outperforms existing products and agrees well with ground-based observations. Additionally, the dataset exhibits consistent temporal patterns and more spatial details.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Yidan Zhang, Yifan Xu, Bo Peng, Wu Chen, Xiaoyu Cui, Tianle Zhang, Xi Chen, Yuan Yao, Mingjin Wang, Junyi Liu, Mei Zheng, Tong Zhu
Summary: This study developed a sensitive method to measure the metallic components of atmospheric fine particulate matter (PM2.5) and compared the results with different analysis methods. The concentrations of metallic components in personal PM2.5 samples were found to be significantly different from corresponding fixed-site samples. Personal sampling can reduce exposure misclassifications, and measuring metallic components is useful for exploring health risks and identifying sources of PM2.5.
ATMOSPHERIC ENVIRONMENT
(2024)
Review
Environmental Sciences
Jamie Leonard, Lea Ann El Rassi, Mona Abdul Samad, Samantha Prehn, Sanjay K. Mohanty
Summary: Increasing concentrations of microplastics in the Earth's atmosphere could have adverse effects on ecosystems and human health. The deposition rate of airborne microplastics is influenced by both land use and climate, and a global analysis suggests that climate may have a greater impact on the concentration and deposition rate of microplastics than land use.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Tian Zhou, Xiaowen Zhou, Zining Yang, Carmen Cordoba-Jabonero, Yufei Wang, Zhongwei Huang, Pengbo Da, Qiju Luo, Zhijuan Zhang, Jinsen Shi, Jianrong Bi, Hocine Alikhodja
Summary: This study investigated the long-range transport and effects of North African and Middle Eastern dust in East Asia using lidar observations and model simulations. The results showed that the dust originated from multiple sources and had a long transport time. The vertical distribution of the dust was found to be crucial for assessing its impacts.
ATMOSPHERIC ENVIRONMENT
(2024)