Journal of environmental sciences最新文献_第4页

Roles of nanoparticles in arsenic mobility and microbial community composition in arsenic-enriched soils 纳米颗粒在富砷土壤中砷迁移和微生物群落组成中的作用

IF 6.9

Journal of environmental sciences Pub Date : 2024-04-01 Epub Date: 2022-11-12 DOI: 10.1016/j.jes.2022.11.001

Ting Luo , Qining Zheng , Jie Yu , Weihao Liang , Yan Sun , Guixiang Quan , Feng Zhou

{"title":"Roles of nanoparticles in arsenic mobility and microbial community composition in arsenic-enriched soils","authors":"Ting Luo , Qining Zheng , Jie Yu , Weihao Liang , Yan Sun , Guixiang Quan , Feng Zhou","doi":"10.1016/j.jes.2022.11.001","DOIUrl":"https://doi.org/10.1016/j.jes.2022.11.001","url":null,"abstract":"<div>Environmental effects of nano remediation engineering of arsenic (As) pollution need to be considered. In this study, the roles of Fe2O3 and TiO2 nanoparticles (NPs) on the microbial mediated As mobilization from As contaminated soil were investigated. The addition of Fe2O3 and TiO2 NPs restrained As(V) release, and stimulated As(III) release. As(V) concentration decreased by 94% and 93% after Fe2O3 addition, and decreased by 89% and 45% after TiO2 addition compared to the Biotic and Biotic+Acetate (amended with sodium acetate) controls, respectively. The maximum values of As(III) were 20.5 and 27.1 µg/L at 48 d after Fe2O3 and TiO2 NPs addition, respectively, and were higher than that in Biotic+Acetate control (12.9 µg/L). The released As co-precipitated with Fe in soils in the presence of Fe2O3 NPs, but adsorbed on TiO2 NPs in the presence of TiO2 NPs. Moreover, the addition of NPs amended with sodium acetate as the electron donor clearly promoted As(V) reduction induced by microbes. The NPs addition changed the relative abundance of soil bacterial community, while Proteobacteria (42.8%-70.4%), Planctomycetes (2.6%-14.3%), and Firmicutes (3.5%-25.4%) were the dominant microorganisms in soils. Several potential As/Fe reducing bacteria were related to Pseudomonas, Geobacter, Desulfuromonas, and Thiobacillus. The addition of Fe2O3 and TiO2 NPs induced to the decrease of arrA gene. The results indicated that the addition of NPs had a negative impact on soil microbial population in a long term. The findings offer a relatively comprehensive assessment of Fe2O3 and TiO2 NPs effects on As mobilization and soil bacterial communities.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"138 ","pages":"Pages 301-311"},"PeriodicalIF":6.9,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49763347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Aqueous-phase formation of N-containing secondary organic compounds affected by the ionic strength 离子强度对含氮仲有机化合物水相形成的影响

IF 6.9

Journal of environmental sciences Pub Date : 2024-04-01 Epub Date: 2023-03-10 DOI: 10.1016/j.jes.2023.03.003

Yuqi Gan , Xiaohui Lu , Shaodong Chen , Xinghua Jiang , Shanye Yang , Xiewen Ma , Mei Li , Fan Yang , Yewen Shi , Xiaofei Wang

{"title":"Aqueous-phase formation of N-containing secondary organic compounds affected by the ionic strength","authors":"Yuqi Gan , Xiaohui Lu , Shaodong Chen , Xinghua Jiang , Shanye Yang , Xiewen Ma , Mei Li , Fan Yang , Yewen Shi , Xiaofei Wang","doi":"10.1016/j.jes.2023.03.003","DOIUrl":"https://doi.org/10.1016/j.jes.2023.03.003","url":null,"abstract":"<div>The reaction of carbonyl-to-imine/hemiaminal conversion in the atmospheric aqueous phase is a critical pathway to produce the light-absorbing N-containing secondary organic compounds (SOC). The formation mechanism of these compounds has been wildly investigated in bulk solutions with a low ionic strength. However, the ionic strength in the aqueous phase of the polluted atmosphere may be higher. It is still unclear whether and to what extent the inorganic ions can affect the SOC formation. Here we prepared the bulk solution with certain ionic strength, in which glyoxal and ammonium were mixed to mimic the aqueous-phase reaction. Molecular characterization by High-resolution Mass Spectrometry was performed to identify the N-containing products, and the light absorption of the mixtures was measured by ultraviolet-visible spectroscopy. Thirty-nine N-containing compounds were identified and divided into four categories (N-heterocyclic chromophores, high-molecular-weight compounds with N-heterocycle, aliphatic imines/hemiaminals, and the unclassified). It was observed that the longer reaction time and higher ionic strength led to the formation of more N-heterocyclic chromophores and the increasing of the light-absorbance of the mixture. The added inorganic ions were proposed to make the aqueous phase somewhat viscous so that the molecules were prone to undergo consecutive and intramolecular reactions to form the heterocycles. In general, this study revealed that the enhanced ionic strength and prolonged reaction time had the promotion effect on the light-absorbing SOC formation. It implies that the aldehyde-derived aqueous-phase SOC would contribute more light-absorbing particulate matter in the industrial or populated area where inorganic ions are abundant.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"138 ","pages":"Pages 88-101"},"PeriodicalIF":6.9,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49763281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Facile low-temperature supercritical carbonization method to prepare high-loading nickel single atom catalysts for efficient photodegradation of tetracycline 简易低温超临界碳化法制备高负荷镍单原子催化剂，用于高效光降解四环素

IF 6.9

Journal of environmental sciences Pub Date : 2024-04-01 Epub Date: 2023-03-25 DOI: 10.1016/j.jes.2023.03.020

Han Qiao , Lirong Zheng , Shiwen Hu , Gang Tang , Hongri Suo , Chongxuan Liu

{"title":"Facile low-temperature supercritical carbonization method to prepare high-loading nickel single atom catalysts for efficient photodegradation of tetracycline","authors":"Han Qiao , Lirong Zheng , Shiwen Hu , Gang Tang , Hongri Suo , Chongxuan Liu","doi":"10.1016/j.jes.2023.03.020","DOIUrl":"https://doi.org/10.1016/j.jes.2023.03.020","url":null,"abstract":"<div>Environmental photocatalysis is a promising technology for treating antibiotics in wastewater. In this study, a supercritical carbonization method was developed to synthesize a single-atom photocatalyst with a high loading of Ni (above 5 wt.%) anchored on a carbon-nitrogen-silicate substrate for the efficient photodegradation of a ubiquitous environmental contaminant of tetracycline (TC). The photocatalyst was prepared from an easily obtained metal-biopolymer-inorganic supramolecular hydrogel, followed by supercritical drying and carbonization treatment. The low-temperature (300°C) supercritical ethanol treatment prevents the excessive structural degradation of hydrogel and greatly reduces the metal clustering and aggregation, which contributed to the high Ni loading. Atomic characterizations confirmed that Ni was present at isolated sites and stabilized by Ni-N and Ni-O bonds in a Ni-(N/O)6<img>C/SiC configuration. A 5% Ni-C-Si catalyst, which performed the best among the studied catalysts, exhibited a wide visible light response with a narrow bandgap of 1.45 eV that could efficiently and repeatedly catalyze the oxidation of TC with a conversion rate of almost 100% within 40 min. The reactive species trapping experiments and electron spin resonance (ESR) tests demonstrated that the h+, and ·O2− were mainly responsible for TC degradation. The TC degradation mechanism and possible reaction pathways were provided also. Overall, this study proposed a novel strategy to synthesize a high metal loading single-atom photocatalyst that can efficiently remove TC with high concentrations, and this strategy might be extended for synthesis of other carbon-based single-atom catalysts with valuable properties.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"138 ","pages":"Pages 373-384"},"PeriodicalIF":6.9,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49741096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Distribution and bioavailability of mercury in size-fractioned atmospheric particles around an ultra-low emission power plant in Southwest China 西南某超低排放电厂周边大气颗粒中汞的分布及生物利用度

IF 6.9

Journal of environmental sciences Pub Date : 2024-04-01 Epub Date: 2023-04-03 DOI: 10.1016/j.jes.2023.03.029

Wei Zhang , Jinjuan Li , Hao Qiu , Xingqiang Guo , Zhijun Fei , Yi Xing , Deliang Yin

{"title":"Distribution and bioavailability of mercury in size-fractioned atmospheric particles around an ultra-low emission power plant in Southwest China","authors":"Wei Zhang , Jinjuan Li , Hao Qiu , Xingqiang Guo , Zhijun Fei , Yi Xing , Deliang Yin","doi":"10.1016/j.jes.2023.03.029","DOIUrl":"https://doi.org/10.1016/j.jes.2023.03.029","url":null,"abstract":"<div>Ultra-low emission (ULE) technology retrofits significantly impact the particulate-bound mercury (Hg) emissions from coal-fired power plants (CFPPs); however, the distribution and bioavailability of Hg in size-fractioned particulate matter (PM) around the ULE-retrofitted CFPPs are less understood. Here, total Hg and its chemical speciation in TSP (total suspended particles), PM10 (aerodynamic particle diameter ≤ 10 µm) and PM2.5 (aerodynamic particle diameter ≤ 2.5 µm) around a ULE-retrofitted CFPP in Guizhou Province were quantified. Atmospheric PM2.5 concentration was higher around this ULE-retrofitted CFPP than that in the intra-regional urban cities, and it had higher mass Hg concentration than other size-fractioned PM. Total Hg concentrations in PM had multifarious sources including CFPP, vehicle exhaust and biomass combustion, while they were significantly higher in autumn and winter than those in other seasons (P < 0.05). Regardless of particulate size, atmospheric PM-bound Hg had lower residual fractions (< 21%) while higher HCl-soluble fractions (> 40%). Mass concentrations of exchangeable, HCl-soluble, elemental, and residual Hg in PM2.5 were higher than those in other size-fractioned PM, and were markedly elevated in autumn and winter (P < 0.05). In PM2.5, HCl-soluble Hg presented a significantly positive relationship with elemental Hg (P < 0.05), while residual Hg showed the significantly positive relationships with HCl-soluble Hg and elemental Hg (P < 0.01). Overall, these results suggested that atmospheric PM-bound Hg around the ULE-retrofitted CFPP tends to accumulate in finer PM, and has higher bioavailable fractions, while has potential transformation between chemical speciation.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"138 ","pages":"Pages 141-152"},"PeriodicalIF":6.9,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49741510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Efficient removal of tetracycline hydrochloride through novel Fe/BiOBr/Bi2WO6 photocatalyst prepared by dual-strategy under visible-light irradiation 双策略制备新型Fe/BiOBr/Bi2WO6光催化剂在可见光照射下高效去除盐酸四环素

IF 6.9

Journal of environmental sciences Pub Date : 2024-04-01 Epub Date: 2023-03-16 DOI: 10.1016/j.jes.2023.03.007

Guanlong Yu , Kai Yang , Yi Yang , Yifu Li , Qifang Sun , Peiyuan Li , Wenming Wang , Fengming Song , Tao Ling , Xuejun Peng , Zhi Yu , Shiquan Sun

{"title":"Efficient removal of tetracycline hydrochloride through novel Fe/BiOBr/Bi2WO6 photocatalyst prepared by dual-strategy under visible-light irradiation","authors":"Guanlong Yu , Kai Yang , Yi Yang , Yifu Li , Qifang Sun , Peiyuan Li , Wenming Wang , Fengming Song , Tao Ling , Xuejun Peng , Zhi Yu , Shiquan Sun","doi":"10.1016/j.jes.2023.03.007","DOIUrl":"https://doi.org/10.1016/j.jes.2023.03.007","url":null,"abstract":"<div>It is important to investigate whether combining two modification strategies has a synergistic effect on the activity of photocatalysts. In this manuscript, Fe-doped BiOBr/Bi2WO6 heterojunctions were synthesized by a one-pot solvothermal method, and excellent photocatalytic performance was obtained for the degradation of tetracycline hydrochloride (TCH) in water without the addition of surfactant. Combining experiments and characterization, the synergistic effect between Fe ion doping and the BiOBr/Bi2WO6 heterojunction was elucidated. The Fe/BiOBr/Bi2WO6 composite photocatalyst had a beneficial void structure, enhanced visible light response, and could inhibit the recombination of photogenerated support well, which improved the photocatalytic activity. The presented experiments demonstrate that Fe/BiOBr/Bi2WO6 removes 97% of TCH from aqueous solution, while pure BiOBr and Bi2WO6 only remove 56% and 65% of TCH, respectively. Finally, the separation and transfer mechanisms of photoexcited carriers were determined in conjunction with the experimental results. This study provides a new direction for the design of efficient photocatalysts through the use of a dual co-modification strategy.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"138 ","pages":"Pages 46-61"},"PeriodicalIF":6.9,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49741285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Atmospheric VOCs in an industrial coking facility and the surrounding area: Characteristics, spatial distribution and source apportionment 某工业焦化设施及周边地区大气VOCs特征、空间分布及来源解析

IF 6.9

Journal of environmental sciences Pub Date : 2024-04-01 Epub Date: 2023-05-04 DOI: 10.1016/j.jes.2023.04.026

Meicheng Wen , Weiqiang Deng , Jin Huang , Shu Zhang , Qinhao Lin , Chao Wang , Shengtao Ma , Wanjun Wang , Xin Zhang , Guiying Li , Taicheng An

{"title":"Atmospheric VOCs in an industrial coking facility and the surrounding area: Characteristics, spatial distribution and source apportionment","authors":"Meicheng Wen , Weiqiang Deng , Jin Huang , Shu Zhang , Qinhao Lin , Chao Wang , Shengtao Ma , Wanjun Wang , Xin Zhang , Guiying Li , Taicheng An","doi":"10.1016/j.jes.2023.04.026","DOIUrl":"https://doi.org/10.1016/j.jes.2023.04.026","url":null,"abstract":"<div>Industrial coking facilities are an important emission source for volatile organic compounds (VOCs). This study analyzed the atmospheric VOC characteristics within an industrial coking facility and its surrounding environment. Average concentrations of total VOCs (TVOCs) in the surrounding residential activity areas (R1 and R2), the coking facility (CF) and the control area (CA) were determined to be 138.5, 47.8, 550.0, and 15.0 µg/m3, respectively. The cold drum process and coking and quenching areas within the coking facility were identified as the main polluting processes. The spatial variation in VOCs composition was analyzed, showing that VOCs in the coking facility and surrounding areas were mainly dominated by aromatic compounds such as BTX (benzene, toluene, and xylenes) and naphthalene, with concentrations being negatively correlated with the distance from the coking facility (p < 0.01). The sources of VOCs in different functional areas across the monitoring area were analyzed, finding that coking emissions accounted for 73.5%, 33.3% and 27.7% of TVOCs in CF, R1 and R2, respectively. These results demonstrated that coking emissions had a significant impact on VOC concentrations in the areas surrounding coking facility. This study evaluates the spatial variation in exposure to VOCs, providing important information for the influence of VOCs concentration posed by coking facility to surrounding residents and the development of strategies for VOC abatement.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"138 ","pages":"Pages 660-670"},"PeriodicalIF":6.9,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49741332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Geobacter sulfurreducens promoted the biosynthesis of reduced graphene oxide and coupled it for nitrobenzene reduction 硫还原菌促进了还原氧化石墨烯的生物合成，并将其偶联用于硝基苯还原

IF 6.9

Journal of environmental sciences Pub Date : 2024-04-01 Epub Date: 2023-04-20 DOI: 10.1016/j.jes.2023.04.009

Shoujuan Zhang , Qi Liu , Linrui Zhong , Jianhong Jiang , Xiaozhe Luo , Xingxin Hu , Qian Liu , Yue Lu

{"title":"Geobacter sulfurreducens promoted the biosynthesis of reduced graphene oxide and coupled it for nitrobenzene reduction","authors":"Shoujuan Zhang , Qi Liu , Linrui Zhong , Jianhong Jiang , Xiaozhe Luo , Xingxin Hu , Qian Liu , Yue Lu","doi":"10.1016/j.jes.2023.04.009","DOIUrl":"https://doi.org/10.1016/j.jes.2023.04.009","url":null,"abstract":"<div>In order to explore an efficient and green method to deal with nitrobenzene (NB) pollutant, reduced graphene oxide (rGO) as an electron shuttle was applied to enhance the extracellular electron transfer (EET) process of Geobacter sulfurreducens, which was a typical electrochemically active bacteria (EAB). In this study, rGO biosynthesis was achieved via the reduction of graphene oxide (GO) by G. sulfurreducens PCA within 3 days. Also, the rGO-PCA combining system completely reduced 50-200 µmol/L of NB to aniline as end product within one day. SEM characterization revealed that PCA cells were partly wrapped by rGO, and therefore the distance of electron transfer between strain PCA and rGO material was reduced. Beside, the ID/IG of GO, rGO, and rGO-PCA combining system were 0.990, 1.293 and 1.31, respectively. Moreover, highest currents were observed in rGO-PCA-NB as 12.950 µA/-12.560 µA at -408 mV/156 mV, attributing to the faster electron transfer efficiency in EET process. Therefore, the NB reduction was mainly due to: (I) direct EET process from G. sulfurreducens PCA to NB; (II) rGO served as electron shuttle and accelerated electron transfer to NB, which was the main degradation pathway. Overall, the biosynthesis of rGO via GO reduction by Geobacter promoted the NB removal process, which provided a facile strategy to alleviate the problematic nitroaromatic pollution in the environment.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"138 ","pages":"Pages 458-469"},"PeriodicalIF":6.9,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49741634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Interannual evolution of the chemical composition, sources and processes of PM2.5 in Chengdu, China: Insights from observations in four winters 中国成都PM2.5化学成分、来源和过程的年际演变:来自四个冬季观测的见解

IF 6.9

Journal of environmental sciences Pub Date : 2024-04-01 Epub Date: 2023-03-07 DOI: 10.1016/j.jes.2023.02.055

Junke Zhang , Jiaqi Li , Yunfei Su , Chunying Chen , Luyao Chen , Xiaojuan Huang , Fangzheng Wang , Yawen Huang , Gehui Wang

{"title":"Interannual evolution of the chemical composition, sources and processes of PM2.5 in Chengdu, China: Insights from observations in four winters","authors":"Junke Zhang , Jiaqi Li , Yunfei Su , Chunying Chen , Luyao Chen , Xiaojuan Huang , Fangzheng Wang , Yawen Huang , Gehui Wang","doi":"10.1016/j.jes.2023.02.055","DOIUrl":"https://doi.org/10.1016/j.jes.2023.02.055","url":null,"abstract":"<div>The air quality in China has improved significantly in the last decade and, correspondingly, the characteristics of PM2.5 have also changed. We studied the interannual variation of PM2.5 in Chengdu, one of the most heavily polluted megacities in southwest China, during the most polluted season (winter). Our results show that the mass concentrations of PM2.5 decreased significantly year-by-year, from 195.8 ± 91.0 µg/m3 in winter 2016 to 96.1 ± 39.3 µg/m3 in winter 2020. The mass concentrations of organic matter (OM), SO42−, NH4+ and NO3− decreased by 49.6%, 57.1%, 49.7% and 28.7%, respectively. The differential reduction in the concentrations of chemical components increased the contributions from secondary organic carbon and NO3− and there was a larger contribution from mobile sources. The contribution of OM and NO3− not only increased with increasing levels of pollution, but also increased year-by-year at the same level of pollution. Four sources of PM2.5 were identified: combustion sources, vehicular emissions, dust and secondary aerosols. Secondary aerosols made the highest contribution and increased year-by-year, from 40.6% in winter 2016 to 46.3% in winter 2020. By contrast, the contribution from combustion sources decreased from 14.4% to 8.7%. Our results show the effectiveness of earlier pollution reduction policies and emphasizes that priority should be given to key pollutants (e.g., OM and NO3−) and sources (secondary aerosols and vehicular emissions) in future policies for the reduction of pollution in Chengdu during the winter months.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"138 ","pages":"Pages 32-45"},"PeriodicalIF":6.9,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49741309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of tree-ring mercury radial translocation and age effect in Masson pine: Implications for historical atmospheric mercury reconstruction 马尾松年轮汞径向迁移和年龄效应的评估:对历史大气汞重建的意义

IF 6.9

Journal of environmental sciences Pub Date : 2024-04-01 Epub Date: 2022-10-27 DOI: 10.1016/j.jes.2022.10.027

Xu Liu , Xun Wang , Dingyong Wang

{"title":"Assessment of tree-ring mercury radial translocation and age effect in Masson pine: Implications for historical atmospheric mercury reconstruction","authors":"Xu Liu , Xun Wang , Dingyong Wang","doi":"10.1016/j.jes.2022.10.027","DOIUrl":"https://doi.org/10.1016/j.jes.2022.10.027","url":null,"abstract":"<div>The tree ring has been regarded as an emerging archive to reconstruct historical atmospheric mercury (Hg) trends, but with the large knowledge gaps in the reliability. In this study, we comprehensively evaluated the Hg source, radial translocation and age effect of Masson pine (Pinus massoniana) tree ring at Mt. Jinyun in Chongqing, to assess the suitability of such tree ring as the archive of atmospheric Hg. Results showed that distinct variabilities among Masson pine tree-ring Hg concentration profiles. The Hg concentration significantly increased along with stem height (P < 0.05), indicating the Hg in tree rings mainly derived from foliage uptake atmospheric Hg. We found a distinct age effect that the tree ring of young trees had the higher Hg concentration. Besides, we used the advection-diffusion model to demonstrate how Hg concentration shifted by the advection or/and diffusion in tree rings. The modeling results showed that the advection induced radial translocation during the young growth period of tree was a plausible mechanism to result in the tree-ring Hg record largely different from the trend of anthropogenic Hg emissions in Chongqing. We finally suggest that in further Hg dendrochemistry, better discarding the tree-ring Hg profile of the young growth period to reduce impacts of the radial translocation and age effect.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"138 ","pages":"Pages 266-276"},"PeriodicalIF":6.9,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49740977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Effects of impregnation sequence on the NH3-SCR activity and hydrothermal stability of a Ce-Nb/SnO2 catalyst 浸渍顺序对Ce-Nb/SnO2催化剂NH3-SCR活性和水热稳定性的影响

IF 6.9

Journal of environmental sciences Pub Date : 2024-04-01 Epub Date: 2023-05-03 DOI: 10.1016/j.jes.2023.04.032

Ying Zhu , Wenpo Shan , Zhihua Lian , Jingjing Liu , Yan Zhang , Hong He

{"title":"Effects of impregnation sequence on the NH3-SCR activity and hydrothermal stability of a Ce-Nb/SnO2 catalyst","authors":"Ying Zhu , Wenpo Shan , Zhihua Lian , Jingjing Liu , Yan Zhang , Hong He","doi":"10.1016/j.jes.2023.04.032","DOIUrl":"https://doi.org/10.1016/j.jes.2023.04.032","url":null,"abstract":"<div>Hydrothermal stability is crucial for the practical application of deNOx catalyst on diesel vehicles, for the selective catalytic reduction of NOx with NH3 (NH3-SCR). SnO2-based materials possess superior hydrothermal stability, which is attractive for the development of NH3-SCR catalyst. In this work, a series of Ce-Nb/SnO2 catalysts, with Ce and Nb loading on SnO2 support, were prepared by impregnation method. It was found that, the NH3-SCR activities and hydrothermal stabilities of the Ce-Nb/SnO2 catalysts significantly varied with the impregnation sequences, and the Ce-Nb(f)/SnO2 catalyst that firstly impregnated Nb and then impregnated Ce exhibited the best performance. The characterization results revealed that Ce-Nb(f)/SnO2 possessed appropriate acidity and redox capability. Furthermore, the strong synergistic effect between Nb and Sn species stabilized the structure and maintained the dispersion of acid sites. This study may provide a new understanding for the effect of impregnation sequence on activity and hydrothermal stability and a new environmental-friendly NH3-SCR catalyst with potential applications for NOx removal from diesel and hydrogen-fueled engines.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"138 ","pages":"Pages 450-457"},"PeriodicalIF":6.9,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49741329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3