Journal of Environmental Sciences-china最新文献

{"title":"Investigation into the degradation of 2,4,6-trichlorophenol utilizing a three-dimensional electrocatalytic reactor filled with fluorine-doped copper-carbon particle electrodes","authors":"Hongrui Zhang ,&nbsp;Wenyu Huang ,&nbsp;Hainong Song ,&nbsp;Hanhui Yan ,&nbsp;Jia Zhang ,&nbsp;Fang Zhong ,&nbsp;Huilan Li","doi":"10.1016/j.jes.2025.01.019","DOIUrl":"10.1016/j.jes.2025.01.019","url":null,"abstract":"<div><div>The three-dimensional particle electrode system exhibits significant potential for application in the treatment of wastewater. Nonetheless, the advancement of effective granular electrodes characterized by elevated catalytic activity and minimal energy consumption continues to pose a significant challenge. In this research, Fluorine-doped copper-carbon (F/Cu-GAC) particle electrodes were effectively synthesized through an impregnation-calcination technique, utilizing granular activated carbon as the carrier and fluorine-doped modified copper oxides as the catalytic agents. The particle electrodes were subsequently utilized to promote the degradation of 2,4,6-trichlorophenol (2,4,6-TCP) in a three-dimensional electrocatalytic reactor (3DER). The F/Cu-GAC particle electrodes were polarized under the action of electric field, which promoted the heterogeneous Fenton-like reaction in which H₂O₂ generated by two-electron oxygen reduction reaction (2e-ORR) of O₂ was catalytically decomposed to •OH. The 3DER equipped with F/Cu-GAC particle electrodes showed 100% removal of 2,4,6-TCP and 79.24% removal of TOC with a specific energy consumption (EC) of approximately 0.019 kWh/g·COD after 2 h of operation. The F/Cu-GAC particle electrodes exhibited an overpotential of 0.38 V and an electrochemically active surface area (ECSA) of 715 cm², as determined through linear sweep voltammetry (LSV) and cyclic voltammetry (CV) assessments. These findings suggest a high level of electrocatalytic performance. Furthermore, the catalytic mechanism of the 3DER equipped with F/Cu-GAC particle electrodes was elucidated through the application of X-ray photoelectron spectroscopy (XPS), electron spin resonance (ESR), and active species capture experiments. This investigation offers a novel approach for the effective degradation of 2,4,6-TCP.</div></div>","PeriodicalId":15788,"journal":{"name":"Journal of Environmental Sciences-china","volume":"155 ","pages":"Pages 701-719"},"PeriodicalIF":5.9,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Freshwater macrophyte type (macroalgae versus phanerogams) mainly determines detritus-derived greenhouse gases production: A microcosm experiment","authors":"Eric Puche ,&nbsp;Belén Roger ,&nbsp;Mariana Vargas-Sánchez ,&nbsp;Salvador Sánchez-Carrillo ,&nbsp;María A. Rodrigo","doi":"10.1016/j.jes.2025.01.015","DOIUrl":"10.1016/j.jes.2025.01.015","url":null,"abstract":"<div><div>Freshwater ecosystems are crucial in the global emissions of greenhouse gases (GHGs) such as CH₄. Macrophytes are the main organic matter (i.e., detritus) supplier to the sediment of these systems, thus controlling CH₄ production. However, species-specific differences (structure and composition) may determine contrasting patterns of detritus transformation into CH₄. Furthermore, eutrophication can affect the degradation and, consequently, CH₄ production. We performed a 64-day microcosm experiment with anoxic incubations of detritus from seven phylogenetically different macrophytes (two charophytes, filamentous algae –<em>Spirogyra, Cladophora</em>–, three submerged plants and an amphibious one), under two trophic conditions (oligo- versus eutrophic) and with/without sediment. We assessed the CH₄ and CO₂ production and the changes in the detritus quality at the end of the experiment. The ranking in the mean cumulative CH₄ production was: <em>Chara hispida</em> &gt; <em>Nitella hyalina</em> &gt; <em>Najas marina</em> ≈ <em>Teucrium scordium</em> &gt; <em>Stuckenia pectinata</em> ≈ <em>Myriophyllum spicatum</em> &gt; filamentous algae, and it was related to the detritus quality. GHGs maximum production rates were 1.6 (<em>N. marina</em>)-1.2 (<em>C. hispida</em>) mmol CH₄/(g OC·day) and 1.7 (<em>N. marina</em>)-1.5 (<em>C. hispida</em>) mmol CO₂/(g OC·day). The CO₂:CH₄ ratio was biased towards CO₂ during the first 10 days (average ratio of 200) and fell afterwards to about 1 for all macrophyte species and treatments. The sediment favored detritus decomposition (probably due to the “positive priming effect”), increasing GHGs production. The influence of nutrient enrichment was not evident. Delving into the macrophyte detritus quality-GHGs production relationship is needed to forecast the GHGs emissions in macrophyte-dominated systems.</div></div>","PeriodicalId":15788,"journal":{"name":"Journal of Environmental Sciences-china","volume":"157 ","pages":"Pages 674-689"},"PeriodicalIF":5.9,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144115808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Cumulative effect of PM2.5 chemical components surpasses PM2.5 mass on hypertension in older adults: A China-based national analysis","authors":"Chen Chen ,&nbsp;Binbin Su ,&nbsp;Yunhe Wang ,&nbsp;Yihao Zhao ,&nbsp;Yutong Wu ,&nbsp;Jun Li ,&nbsp;Yanan Luo ,&nbsp;Xiaoying Zheng","doi":"10.1016/j.jes.2025.01.014","DOIUrl":"10.1016/j.jes.2025.01.014","url":null,"abstract":"<div><div>The specific and cumulative effects of fine particulate matter (PM_2.5) components on hypertension remain less defined, notably in susceptible older adults. This national study utilized a representative sample of 220,425 older adults in China, to scrutinize their relationship. Residential PM_2.5 and five chemical components (black carbon (BC), organic matter (OM), sulphate (SO₄²⁻), nitrate (NO₃⁻), and ammonium (NH₄⁺)) were estimated by the bilinear interpolation. Associations between PM_2.5 and five chemical components with hypertension were examined through two-stage logistic regression models, with population attributable fractions (PAFs) determined via counterfactual analysis. Elevated exposure to PM_2.5 and its components was generally linked to higher hypertension prevalence. With each interquartile range increase, the odds ratio (OR) of hypertension rose by 1.09 (95 % CI: 1.08–1.11) for NO₃⁻, 1.06 (95 % CI: 1.05–1.08) for NH₄⁺, 1.06 (95 % CI: 1.05–1.07) for OM, 1.05 (95 % CI: 1.04–1.06) for BC, and 1.06 (95 % CI: 1.04–1.07) for SO₄^2-. Notably, the cumulative impact of five PM_2.5 chemical components (OR: 1.13, 95 % CI: 1.12–1.13) was significantly greater than the effect of total PM_2.5 mass alone (OR: 1.04, 95 % CI: 1.03–1.05). Regarding PAFs, NO₃⁻ represented the strongest contribution to hypertension, followed by OM, NH₄⁺, SO₄²⁻, and BC. Furthermore, the effects were accentuated in low socio-economic population. These findings underline that using total PM_2.5 as a surrogate marker may underestimate the comprehensive impact of its chemical components, underscoring the necessity for targeted interventions to reduce emissions of specific PM_2.5 chemical constituents.</div></div>","PeriodicalId":15788,"journal":{"name":"Journal of Environmental Sciences-china","volume":"157 ","pages":"Pages 782-792"},"PeriodicalIF":5.9,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144137923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Reconstruction of the three-dimensional dissolved oxygen and its spatio-temporal variations in the Mediterranean Sea using machine learning","authors":"Guangsheng Liu ,&nbsp;Xiang Yu ,&nbsp;Jiahua Zhang ,&nbsp;Xiaopeng Wang ,&nbsp;Nuo Xu ,&nbsp;Shawkat Ali","doi":"10.1016/j.jes.2025.01.010","DOIUrl":"10.1016/j.jes.2025.01.010","url":null,"abstract":"<div><div>Oceanic dissolved oxygen (DO) concentration is crucial for assessing the status of marine ecosystems. Against the backdrop of global warming, DO shows a general decrease, posing a threat to the health of marine ecosystems. Therefore, there is an urgent need to develop advanced tools to characterize the spatio-temporal variations of three-dimensional (3D) DO. To address this challenge, this study introduces the Light Gradient Boosting Machine (LightGBM), combining satellite remote sensing and reanalysis data with Biogeochemical Argo data to accurately reconstruct the 3D DO structure in the Mediterranean Sea from 2010 to 2022. Various environmental parameters are incorporated as inputs, including spatio-temporal features, meteorological characteristics, and ocean color properties. The LightGBM model demonstrates excellent performance on the testing dataset with <em>R</em>² of 0.958. The modeled DO agrees better with in-situ measurements than products from numerical models. Using the Shapley Additive exPlanations method, the contributions of input features are assessed. Sea surface temperatures provide a correlation with DO at the sea surface, while spatial coordinates supplement the view of the ocean interior. Based on the reconstructed 3D DO structure, we identify an oxygen minimum zone in the western Mediterranean that expands continuously, reaching depths of approximately 300–800 m. The western Mediterranean exhibits a significant declining trend. This study enhances marine environmental evidence by proposing a precise and cost-effective approach for reconstructing 3D DO, thereby offering insights into the dynamics of DO variations under changing climatic conditions.</div></div>","PeriodicalId":15788,"journal":{"name":"Journal of Environmental Sciences-china","volume":"157 ","pages":"Pages 710-728"},"PeriodicalIF":5.9,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Response of abundant and rare microbial taxa to three iron-carbon composite amendments in metal-contaminated agricultural soil","authors":"Ting Yang ,&nbsp;Jiacan Li ,&nbsp;Ying Yuan ,&nbsp;Xin Zheng ,&nbsp;Yifei Liu ,&nbsp;Bing Zhang ,&nbsp;Tan Chen ,&nbsp;Jun Jin ,&nbsp;Linlan Zhuang","doi":"10.1016/j.jes.2025.01.009","DOIUrl":"10.1016/j.jes.2025.01.009","url":null,"abstract":"<div><div>Traditional studies of microbial succession under iron-carbon composite (Fe-C) amendment application have focused on the entire microbial community, with limited attention to the responses and ecological roles of abundant or rare taxa. Herein, a 90-day microcosm incubation was conducted to investigate the effects of three Fe-C amendments, including Fe₃O₄-modified biochar (FeC-B), ferrihydrite-natural humic acid (FeC-N), and ferrihydrite-synthetic humic-like acid (FeC-S), on distribution patterns, assembly processes, and ecological functions of both abundant and rare subcommunities. Our results showed that Fe-C amendments significantly affected the α-diversity of rare taxa, particularly under FeC-B treatment, with minimal impact on abundant taxa. Fe-C amendments also reshaped the community structures of both groups. Rare taxa, representing 63.9 % of Operational Taxonomic Unit (OTU) richness but only 1.6 % of total abundance, played a key role in community diversity and were more susceptible to Fe-C amendments. Certain rare taxa transitioned to abundant status, demonstrating their potential as a microbial seed bank. Abundant taxa were positioned more centrally within the networks, and Fe-C applications promoted cooperative interactions between abundant and rare species. Deterministic processes dominated the assembly of the rare subcommunity, while stochastic processes primarily influenced the abundant bacterial community. Fe-C amendments reduced community differentiation among rare taxa while increasing variability among abundant groups. Functional diversity of rare groups surpassed that of abundant groups, with notable enhancement in nitrogen cycling-related genes under Fe-C treatments. This study highlights the complementary roles of abundant and rare taxa in soil remediation, providing insights for optimizing remediation strategies.</div></div>","PeriodicalId":15788,"journal":{"name":"Journal of Environmental Sciences-china","volume":"157 ","pages":""},"PeriodicalIF":5.9,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Pollution sources, characteristics and environmental risk assessment of heavy metals in surface water and sediments of typical pyrite mine in Southwest China","authors":"Ziqiu Nie ,&nbsp;Jiabin Luo ,&nbsp;Jie Tang ,&nbsp;Bo Li ,&nbsp;Bohan Chen ,&nbsp;Man Gao ,&nbsp;Xingjie Wang ,&nbsp;Liu Guo","doi":"10.1016/j.jes.2025.01.008","DOIUrl":"10.1016/j.jes.2025.01.008","url":null,"abstract":"<div><div>Abandoned mines, especially pyrite-rich ones, release acid mine drainage (AMD) with high acidity and excessive amounts of heavy metals, threatening regional ecosystems. Six samples of mine drainage, nine samples of surface water, and twelve samples of sediment were analyzed in this case study of the Dashu pyrite mine in southwest China. A comprehensive analysis of the pollution levels, pollution sources, and potential hazards of eight metals (Ni, Cd, Cu, Zn, Fe, Al, Pb, and Mn) that exceeded regulatory standards was conducted by monitoring 24 conventional and characteristic indicators. Ultimately, this research evaluated the environmental hazards associated with abandoned mine water using the \"pressure-response\" model, thereby providing valuable insights for the effective protection of the environment in mining regions. The primary pollutants in mine water were determined to be SO₄²⁻, Fe, and Mn, with concentrations of 7700, 1450, and 6.78 mg/L, respectively. A clear \"source-sink\" dynamic was observed between the mine water and the surrounding water system. surface water was primarily polluted by Ni and Mn, while water system sediments were primarily polluted by Cu and Hg. Ion ratio and Pearson correlation analyses indicated heavy metals in surface water and sediments originated from the same AMD source. The \"pressure-response\" model was used to assess the environmental hazards of water from abandoned mines. Mines W1, W2, W5, and W6 were classified as high-risk, while W3 and W4 were medium-risk. This study offers a novel approach and valuable reference for identifying and classifying environmental risks in abandoned mines and targeting AMD treatment.</div></div>","PeriodicalId":15788,"journal":{"name":"Journal of Environmental Sciences-china","volume":"157 ","pages":"Pages 742-755"},"PeriodicalIF":5.9,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Water level fluctuations shape phytoplankton community in the Xiangxi Bay from Three Gorges Reservoir","authors":"Lingchao Fang ,&nbsp;Wujuan Mi ,&nbsp;Yuan Li ,&nbsp;Xiaohan Ai ,&nbsp;Yonghong Bi","doi":"10.1016/j.jes.2025.01.004","DOIUrl":"10.1016/j.jes.2025.01.004","url":null,"abstract":"<div><div>Water level fluctuations (WLFs) constituted a dominant factor controlling the structure and function of freshwater ecosystems but the mechanism of WLFs on phytoplankton community structure was still unknown. We investigated the characteristics of phytoplankton community structure in Xiangxi Bay from January 2017 to December 2020. Results indicated water level (WL) of the Three Gorges Reservoir was divided into four distinct stages: the decreasing stage (DS), the low water level stage (LS), the storage stage (SS), and the high water level stage (HS). Notably, Cyanophyta predominated during the LS, with <em>Microcystis</em> sp. being the dominant species. Bacillariophyta was predominant in other three WL stages, with <em>Melosira</em> sp. and <em>Cyclotella</em> sp. as the dominant species. The highest biomass appeared in LS, whereas the lowest appeared in HS. Moreover, alpha diversity appeared to be lower in both HS and LS compared to DS and SS. Redundancy analysis showed WL as the key driver of phytoplankton community. Partial least squares path model analyses demonstrated that WL not only altered chemical factors (path coefficient = -0.62, <em>P</em> &lt; 0.01), thereby leading to changes in phytoplankton biomass (path coefficient = 0.56, <em>P</em> &lt; 0.01), but also changed the physical factors (path coefficient = -0.69, <em>P</em> &lt; 0.01) and consequently had an impact on phytoplankton biomass (path coefficient = 0.33, <em>P</em> &lt; 0.01). Furthermore, WL influenced phytoplankton diversity by altering chemical and physical factors. In conclusion, WL was an important factor influencing phytoplankton community, which implied that reservoir operation was the potential strategy to regulate phytoplankton communities.</div></div>","PeriodicalId":15788,"journal":{"name":"Journal of Environmental Sciences-china","volume":"157 ","pages":"Pages 111-122"},"PeriodicalIF":5.9,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143882095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Associations of pharmaceutical and personal care product chemical exposure with thyroid nodules and thyroid homeostasis","authors":"Yawen Zheng ,&nbsp;Lei Zhang ,&nbsp;Qian Xiang ,&nbsp;Jingguang Li ,&nbsp;Yiming Yao ,&nbsp;Yongning Wu ,&nbsp;Hongwen Sun ,&nbsp;Hongzhi Zhao","doi":"10.1016/j.jes.2025.01.006","DOIUrl":"10.1016/j.jes.2025.01.006","url":null,"abstract":"<div><div>Pharmaceuticals and personal care products (PPCPs) have been considered as potential contributors to thyroid nodule (TN) and abnormal thyroid homeostasis, but epidemiological evidence is scarce. A total of 1261 individuals comprised of 367 TN patients and 895 controls were recruited from Sichuan, China. The urinary concentrations of fourteen PPCPs were measured. Five thyroid hormones (THs) in serum were determined as indicators of thyroid homeostasis, including thyroid-stimulating hormone, triiodothyronine (T3), thyroxine (T4), free-T3 and free-T4. Serum levels of thyroglobulin antibody (TGAb) and thyroperoxidase antibody (TPOAb) were quantified to identify individual thyroid antibody (TA) statuses. TN patients exhibited higher propyl-paraben (PrP) (median: 1.30 µg/g Cr) level than controls (0.64 µg/g Cr). PrP were significantly associated with TN risk with ORs of 1.060 (95 % CI: 1.002, 1.122). The relationship of methyl-paraben with TN risk was nonlinear (<em>p =</em> 0.049). PPCP exposure was significant with TN risk only in females and TA positive (TPOAb or TGAb) groups, indicating that PPCP susceptibility to TN differs by sex and TA status. Linear regression models showed ethyl-paraben was significantly negatively associated with T4 (β<em>: -</em>0.005, 95 % CI: -0.011, -0.002) and T3 (β<em>: -</em>0.007, 95 % CI: -0.015, -0.002), and positively associated with TPOAb (β<em>:</em> 0.059, 95 % CI: 0.000, 0.119), suggesting that certain PPCP exposure could affect thyroid homeostasis and autoimmunity. The effects of PPCP exposure on TH and TA levels presented sex-specific. Our findings suggest that PPCP exposure increases TN risk and affects thyroid homeostasis, exhibiting sex and antibody status dependence.</div></div>","PeriodicalId":15788,"journal":{"name":"Journal of Environmental Sciences-china","volume":"157 ","pages":"Pages 21-34"},"PeriodicalIF":5.9,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Microbial-mediated soil dissolved organic nitrogen transformation pathways: Implications for groundwater nitrogen contamination risk mitigation","authors":"Leyun Wang,&nbsp;Miao Li,&nbsp;Xiang Liu","doi":"10.1016/j.jes.2025.01.007","DOIUrl":"10.1016/j.jes.2025.01.007","url":null,"abstract":"<div><div>The exploration of the molecular characteristics and transformation processes of soil dissolved organic nitrogen (DON) compounds is paramount, as they affect the leaching of DON components into groundwater. Nevertheless, the molecular transformation pathways remain largely uncharted territories. Hence, a comprehensive study of microbial-medicated DON transformation pathways across various land use soils was conducted. The determination of DON components and microbial communities was accomplished utilizing advanced techniques, namely fourier transform ion cyclotron resonance mass spectrometry and 16S rRNA sequencing. These methodologies were synergistically integrated with the FAPROTAX database and network analysis. The results showed that DON emerged as the predominant nitrogen fraction, displaying significant variations in composition across these soils. The dominant constitutes comprised lignin-like and condensed aromatic compounds, varying in their aromaticity and condensation degrees. Key microbial genera, including <em>Solirubrobacter</em>, 67–14, and <em>Bacillus</em>, were identified as crucial for DON decomposition and mineralization. Functional annotation revealed abundant bacteria associated with the breakdown of aromatic compounds, the degradation of aliphatic non-methane hydrocarbons, and the hydrolysis of cellulose. Network analysis emphasized the interconnected and cooperative aspects of DON transformation processes, with notable relationships between N respiration and various degradation activities. Correlation analysis between microbial functions and DON components emphasized distinct mechanisms involved in the transformation of DON components. The orchestrated process of converting high-molecular-weight DON into low-molecular-weight counterparts facilitates potential leaching into groundwater, emphasizing the need for understanding and managing microbial-mediated DON transformation pathways to mitigate groundwater contamination risk.</div></div>","PeriodicalId":15788,"journal":{"name":"Journal of Environmental Sciences-china","volume":"157 ","pages":"Pages 100-110"},"PeriodicalIF":5.9,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143882093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Selective ozone oxidation of ammonium ion catalyzed by carbon nanocage-supported Co3O4: Role of oxygen vacancies and electron transfer sites","authors":"Yu Gao ,&nbsp;Xiemin Liu ,&nbsp;Weida Chen ,&nbsp;Jin Jin ,&nbsp;Xizhang Wang ,&nbsp;Feng Zhang ,&nbsp;Xiankun Wu","doi":"10.1016/j.jes.2025.01.003","DOIUrl":"10.1016/j.jes.2025.01.003","url":null,"abstract":"<div><div>For the effective treatment of the wastewater with low-medium concentration ammonia nitrogen and low strength COD, a high-performance Co₃O₄ catalyst supported on carbon nanocages (CNCs) was prepared. By isovolumetric im pregnation, Co₃O₄ could be uniformly dispersed on surface of CNCs, which possess tiny particle size and strong electron transfer capability. The catalytic performance of the prepared Co₃O₄/CNCs catalysts with different Co₃O₄ loadings was systematically evaluated and compared with Co₃O₄/CNTs. It is found that 20 wt.% Co₃O₄/CNCs shows the best catalytic performance, achieving an ammonia nitrogen conversion rate of 71.0 % and a nitrogen selectivity of 81.8 %. Compared to commonly used Co₃O₄, ammonia conversion and nitrogen selectivity of Co₃O₄/CNCs increased by 28.9 % and 15.8 % respectively. In the five consecutive cycles, the catalytic activity remained stable. The mechanism that CNCs support effectively increases the surface oxygen vacancies of Co₃O₄ through XPS analysis was also elucidated, and DFT calculations confirm strong electron transfer between CNCs and Co₃O₄, rendering Co₃O₄ nanoparticles as the primary catalytic active sites. The results may contribute to the development of high-performance catalytic ozone oxidation catalysts for ammonia nitrogen.</div></div>","PeriodicalId":15788,"journal":{"name":"Journal of Environmental Sciences-china","volume":"155 ","pages":"Pages 151-162"},"PeriodicalIF":5.9,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}