作者机构:
[Yun Cao; Mengmeng Liu; Wenying Zhang; Xiaotong Zhang] China CDC Key Laboratory of Environment and Population Health, National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China;National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China;School of Public Health, Anhui Medical University, Hefei 230032, China;[Mats Tysklind] Department of Chemistry, Umea University, Umea SE-901 87, Sweden;College of Life Science, Huazhong Normal University, Wuhan 430079, China
通讯机构:
[Xianliang Wang] C;China CDC Key Laboratory of Environment and Population Health, National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China<&wdkj&>National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China<&wdkj&>School of Public Health, Anhui Medical University, Hefei 230032, China
摘要:
To explore the multicenter characteristics of endocrine-like phthalate esters (PAEs) in household dust and propose effective control strategies for global indoor public health. An on-site observational investigation was conducted in nine Chinese cities from 2018 to 2019. A total of 246 household dust samples were collected and analyzed for ten PAE congeners using Gas Chromatography-Mass Spectrometry (GC-MS). Questionnaires were used to gather information on building conditions, indoor behaviors, and ventilation habits. In residential dust from the nine cities, the total concentrations of the ten PAE congeners (∑PAEs) ranged from 0.921 to 29097.297 µg/g. Dicyclohexyl phthalate (DCHP) and di (2-ethylhexyl) phthalate (DEHP) were the dominant congeners in ∑PAEs. Childhood exposure to PAEs through dust ingestion was four orders of magnitude higher than through inhalation, with a carcinogenic risk of 5.47 × 10−6 for DEHP exposure in household dust. Higher ∑PAEs concentrations were associated with higher temperature, double glazing, wall paint usage, television and computer use, and indoor plant growth. This multicenter on-site investigation confirmed PAE pollution characteristics and uncovered the inacceptable risk of daily DEHP exposure in household dust under real living conditions. Effective mitigation measures based on household-related information, residential characteristics, decoration materials, and lifestyle should be taken to build a healthy household environment.
作者机构:
[Guo, Furong; Gao, Tingjuan] Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental & Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, China;School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;[Li, Jiangshan] State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;[Cao, Shiyu] Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental & Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, China<&wdkj&>State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;[Shi, Yanbiao; Zhang, Lizhi] Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental & Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, China<&wdkj&>School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
通讯机构:
[Tingjuan Gao; Lizhi Zhang] K;Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental & Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, China<&wdkj&>School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China<&wdkj&>Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental & Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, China
摘要:
Nano zero-valent iron (nZVI) is a promising phosphate adsorbent for advanced phosphate removal. However, the rapid passivation of nZVI and the low activity of adsorption sites seriously limit its phosphate removal performance, accounting for its inapplicability to meet the emission criteria of 0.1 mg P/L phosphate. In this study, we report that the oxalate modification can inhibit the passivation of nZVI and alter the multi-stage phosphate adsorption mechanism by changing the adsorption sites. As expected, the stronger anti-passivation ability of oxalate modified nZVI (OX-nZVI) strongly favored its phosphate adsorption. Interestingly, the oxalate modification endowed the surface Fe(III) sites with the lowest chemisorption energy and the fastest phosphate adsorption ability than the other adsorption sites, by in situ forming a Fe(III)-phosphate-oxalate ternary complex, therefore enabling an advanced phosphate removal process. At an initial phosphate concentration of 1.00 mg P/L, pH of 6.0 and a dosage of 0.3 g/L of adsorbents, OX-nZVI exhibited faster phosphate removal rate (0.11 g/mg/min) and lower residual phosphate level (0.02 mg P/L) than nZVI (0.055 g/mg/min and 0.19 mg P/L). This study sheds light on the importance of site manipulation in the development of high-performance adsorbents, and offers a facile surface modification strategy to prepare superior iron-based materials for advanced phosphate removal.
作者机构:
[Quan, Fengjiao; Xu, Pengfei; Chen, Xiaolan; Shen, Wenjuan; He, Yun; Li, Jianfen] College of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China;[Jia, Falong] College of Chemistry, Central China Normal University, Wuhan 430079, China;[Zhan, Guangming] School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
通讯机构:
[Falong Jia] C;College of Chemistry, Central China Normal University, Wuhan 430079, China
摘要:
Nitrate (NO3–) is a widespread pollutant in high-salt wastewater and causes serious harm to human health. Although electrochemical removal of nitrate has been demonstrated to be a promising treatment method, the development of low-cost electro-catalysts is still challenging. In this work, a phosphate modified iron (P-Fe) cathode was prepared for electrochemical removal of nitrate in high-salt wastewater. The phosphate modification greatly improved the activity of iron, and the removal rate of nitrate on P-Fe was three times higher than that on Fe electrode. Further experiments and density functional theory (DFT) calculations demonstrated that the modification of phosphoric acid improved the stability and the activity of the zero-valent iron electrode effectively for NO3– removal. The nitrate was firstly electrochemically reduced to ammonium, and then reacted with the anodic generated hypochlorite to N2. In this study, a strategy was developed to improve the activity and stability of metal electrode for NO3– removal, which opened up a new field for the efficient reduction of NO3– removal by metal electrode materials.
期刊:
Applied Mathematics and Computation,2025年484:129018 ISSN:0096-3003
通讯作者:
Zihan Zhou
作者机构:
[Zihan Zhou] Faculty of Mathematics and Statistics, and Hubei Key Lab–Math. Sci., Central China Normal University, Wuhan 430079, China;Key Laboratory of Nonlinear Analysis & Applications (Ministry of Education), Central China Normal University, Wuhan 430079, China;[Shuchao Li] Faculty of Mathematics and Statistics, and Hubei Key Lab–Math. Sci., Central China Normal University, Wuhan 430079, China<&wdkj&>Key Laboratory of Nonlinear Analysis & Applications (Ministry of Education), Central China Normal University, Wuhan 430079, China
通讯机构:
[Zihan Zhou] F;Faculty of Mathematics and Statistics, and Hubei Key Lab–Math. Sci., Central China Normal University, Wuhan 430079, China
摘要:
Characterizing the graph having the maximum or minimum spectral radius in a given class of graphs is a classical problem in spectral extremal graph theory, originally proposed by Brualdi and Solheid. Given a graph G, a vertex subset S is called a maximum generalized 4-independent set of G if the induced subgraph G[S] dose not contain a 4-tree as its subgraph, and the subset S has maximum cardinality. The cardinality of a maximum generalized 4-independent set is called the generalized 4-independence number of G. In this paper, we firstly determine the connected graph (resp. bipartite graph, tree) having the largest spectral radius over all connected graphs (resp. bipartite graphs, trees) with fixed order and generalized 4-independence number, in addition, we establish a lower bound on the generalized 4-independence number of a tree with fixed order. Secondly, we describe the structure of all the n-vertex graphs having the minimum spectral radius with generalized 4-independence number ψ, where ψ⩾⌈3n/4⌉. Finally, we identify all the connected n-vertex graphs with generalized 4-independence number ψ∈{3,⌈3n/4⌉,n−1,n−2} having the minimum spectral radius.
期刊:
OPTICS AND LASER TECHNOLOGY,2025年181:111582 ISSN:0030-3992
通讯作者:
Hai Lin
作者机构:
[Zihao Yu; Hai Lin; Rui Zhou] College of physical science and technology, Central China Normal University, Wuhan 430079, China;[Yiting Wang] Tobacco Hubei Industrial LLC, WUHAN Cigarette Factory, Wuhan 430000, China
通讯机构:
[Hai Lin] C;College of physical science and technology, Central China Normal University, Wuhan 430079, China
摘要:
Terahertz sensors with high sensitivity are essential for accurately detecting substances in various fields such as medical research, diagnostics, security, and molecular analysis. Their effectiveness relies on detecting small index changes that indicate a target, requiring resonance with an extremely high Q factor. Notably, taking advantage of topological corner states with narrow spectral widths and constant eigenfrequencies is a powerful strategy to attain high Q values. Combining the topological edge modes of valley twist states and high-order corner states, we have designed a topological sensor composed of a topological cavity and topological waveguide. The proposed sensor possesses an ultra-high Q value of up to 1.02×105. The exceedingly narrow linewidth of the topological cavity allows it to detect even the slightest changes in the spectrum, resulting in a high sensitivity of up to 2.06THz/RIU and a notable Figure of Merit (FoM) standing at 3.86×104. Moreover, the sensor is robust to structural disorder and defects inherent in fabrication processes, ensuring reliable performance in practical applications in different environments and manufacturing conditions.
期刊:
Journal of Mathematical Analysis and Applications,2025年541(2):128726 ISSN:0022-247X
通讯作者:
Xiaolong Yang
作者机构:
[Chenchen Liu] School of Mathematics and Statistics, Central China Normal University, Wuhan 430079, China;[Xiaolong Yang] School of Mathematics and Statistics, Henan University, Kaifeng 475004, China
通讯机构:
[Xiaolong Yang] S;School of Mathematics and Statistics, Henan University, Kaifeng 475004, China
摘要:
We consider the existence of sign-changing solutions for the following nonlinear Choquard equation {−Δu=(Iα⁎|u|p)|u|p−2u+λu,x∈Ω,u∈H01(Ω), where N≥3,α∈(0,N),λ∈R, p∈(1,N+αN−2] and Ω⊂RN is a smooth bounded domain. Iα:RN→R is the Riesz potential. In critical case p=N+αN−2, if Ω is symmetric about the axis x1, we firstly develop the limit profiles for the symmetric Palais-Smale sequence by the concentration compactness principle. Then we conclude that the problem admits an odd solution with exactly two nodal domains for λ∈(0,λ1),N≥4andα∈(2,N). In contrast, the local Brezis-Nirenberg type problem −Δu=|u|4N−2u+λu,u∈H01(Ω) can not permit such type of odd symmetry solution.
期刊:
Journal of Algebra,2025年661:123-159 ISSN:0021-8693
通讯作者:
Yuanyang Zhou
作者机构:
[Fuming Jiang; Yuanyang Zhou] School of Mathematics and Statistics, Central China Normal University, Wuhan, 430079, PR China
通讯机构:
[Yuanyang Zhou] S;School of Mathematics and Statistics, Central China Normal University, Wuhan, 430079, PR China
摘要:
We define inertial blocks of finite groups over arbitrary fields and prove that a block covered by an inertial block over a bigger field of characteristic p is still inertial if p is odd or if the inertial block has abelian defect groups. Combined with some known facts, this result implies that Broué's conjecture over arbitrary fields holds for many blocks, for example, blocks for p-solvable groups with abelian defect groups. Consequently, we partially prove Puig's finiteness conjecture for inertial blocks over fields with odd characteristic or with abelian defect groups.