WATER RESEARCH
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2024
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IF 11.4
Xiangyu Yang,Yi Chen,Tao Liu,Lu Zhang,Hui Wang,Mengli Chen,Qiang He,Gang Liu,Feng Ju
Constructed wetlands (CWs) have been proven to effectively immobilize plastic particles. However, little is known about the differences in the impact of varying sized plastic particles on nitrous oxide (N 2 O) release, as well as the intervention mechanisms in CWs. Here, we built a lab-scale wetland model and introduced plastic particles of macro-, micro-, and nano-size at 100 μg/L for 370 days. The results showed that plastic particles of all sizes reduced N 2 O release in CWs, with the degrees being the strongest for the Nano group, followed by Micro and Macro groups. Meanwhile, 15 N- and 18 O-tracing experiment revealed that the ammoxidation process contributed the most N 2 O production, followed by denitrification. While for every N 2 O-releasing process, the contributing proportion of N 2 O in nitrification-coupled denitrification were most significantly cut down under exposing to macro-sized plastics and had an obvious increase in nitrifier denitrification in all groups, respectively. Finally, we revealed the three mechanism pathways of N 2 O release reduction with macro-, micro-, and nano-sized plastics by impacting carbon assimilation (RubisCO activity), ammonia oxidation (gene amo abundance and HAO activity), and N-ion transmembrane and reductase activities, respectively. Our findings thus provided novel insights into the potential effects of plastic particles in CWs as an eco-technology.
研究领域:
环境科学
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微生物学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Xiaofei Li,Mengting Qi,Qiuxuan Li,Boshuang Wu,Yuxuan Fu,Xia Liang,Guoyu Yin,Yanling Zheng,Hongpo Dong,Min Liu,Lijun Hou
Global warming and acidification, induced by a substantial increase in anthropogenic CO2 emissions, are expected to have profound impacts on biogeochemical cycles. However, underlying mechanisms of nitrous oxide (N2O) production in estuarine and coastal sediments remain rarely constrained under warming and acidification. Here, the responses of sediment N2O production pathways to warming and acidification were examined using a series of anoxic incubation experiments. Denitrification and N2O production were largely stimulated by the warming, while N2O production decreased under the acidification as well as the denitrification rate and electron transfer efficiency. Compared to warming alone, the combination of warming and acidification decreased N2O production by 26 ± 4%, which was mainly attributed to the decline of the N2O yield by fungal denitrification. Fungal denitrification was mainly responsible for N2O production under the warming condition, while bacterial denitrification predominated N2O production under the acidification condition. The reduced site preference of N2O under acidification reflects that the dominant pathways of N2O production were likely shifted from fungal to bacterial denitrification. In addition, acidification decreased the diversity and abundance of nirS-type denitrifiers, which were the keystone taxa mediating the low N2O production. Collectively, acidification can decrease sediment N2O yield through shifting the responsible production pathways, partly counteracting the warming-induced increase in N2O emissions, further reducing the positive climate warming feedback loop.
研究领域:
环境科学
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微生物学
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DOI
PubMed
高影响因子
GLOBAL CHANGE BIOLOGY
·
2021
·Vol. 27
·期 21
·5564-5579
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IF 10.863
Xiaoxuan Su,Teng Wen,Yingmu Wang,Junshi Xu,Li Cui,Jinbo Zhang,Ximei Xue,Kai Ding,Yijia Tang,Yong-guan Zhu
Ocean acidification in nitrogen-enriched estuaries has raised global concerns. For decades, biotic and abiotic denitrification in estuarine sediments has been regarded as the major ways to remove reactive nitrogen, but they occur at the expense of releasing greenhouse gas nitrous oxide (N 2 O). However, how these pathways respond to acidification remains poorly understood. Here we performed a N 2 O isotopocules analysis coupled with respiration inhibition and molecular approaches to investigate the impacts of acidification on bacterial, fungal, and chemo-denitrification, as well as N 2 O emission, in estuarine sediments through a series of anoxic incubations. Results showed that acidification stimulated N 2 O release from sediments, which was mainly mediated by the activity of bacterial denitrifiers, whereas in neutral environments, N 2 O production was dominated by fungi. We also found that the contribution of chemo-denitrification to N 2 O production cannot be ignored, but was not significantly affected by acidification. The mechanistic investigation further demonstrated that acidification changed the keystone taxa of sedimentary denitrifiers from N 2 O-reducing to N 2 O-producing ones and reduced microbial electron-transfer efficiency during denitrification. These findings provide novel insights into how acidification stimulates N 2 O emission and modulates its pathways in estuarine sediments, and how it may contribute to the acceleration of global climate change in the Anthropocene.
研究领域:
海洋生物学
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环境科学
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微生物学
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DOI
PubMed
高影响因子
Frontiers in Microbiology
·
2020
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IF 4.236
Zhang Shujuan,You Zhaoyang,Guo Xinyue,Yun Wenfei,Xia Yu,Rillig Matthias C.
Employing mycorrhiza-defective mutants and their progenitors does not require inoculation or elimination of the resident microbial community in the experimental study of mycorrhizal soil ecology. We aimed to examine the suitability of mycorrhiza-defective rice (non-mycorrhizal, Oryza sativa L., cv. Nipponbare) and its progenitor (mycorrhizal) to evaluate nitrogen (N) loss control from paddy fields via arbuscular mycorrhizal (AM) fungi. We grew the two rice lines in soils with the full community of AM fungi and investigated root AM colonization. In the absence of AM fungi, we estimated rice N content, soil N concentration and microbial community on the basis of phospholipid fatty acids; we also quantified N loss via NH3 volatilization, N2O emission, runoff and leaching. In the presence of AM fungi, we did not find any evidence of AM colonization for non-mycorrhizal rice while mycorrhizal rice was colonized and percentage of root colonization was 17–24%. In the absence of AM fungi, the two rice lines had similar N content, soil N concentration and microbial community. Importantly, there was no significant difference in N loss via all the four pathways between mycorrhizal and non-mycorrhizal systems. This mycorrhizal/non-mycorrhizal rice pair is suitable for further research on the role of AM fungi in the control of soil N loss in paddy fields.
研究领域:
植物学
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土壤学
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环境科学
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产品关联
DOI
PubMed
高影响因子
CATALYSIS TODAY
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2022
·
IF 6.562
Bin Kang,Ming Li,Zhaoying Di,Xiaonan Guo,Ying Wei,Jingbo Jia,Runduo Zhang
Series of ZSM-5 zeolites with diverse contents and locations of Al pairs were synthesized, and Co 2+ ions were subsequently anchored at the Al pairs of ZSM-5 zeolites by wet ion-exchange with H protons. The Co-ZSM-5 sample derived from the mixtures of AlCl 3 and TEOS of Si/Al=30.3 showed the best de N 2 O performance. Analysis on Co (Ⅱ) ion exchange capacity demonstrated the content of Al pairs followed the sequence: AlCl 3 (0.84) > Al(NO 3 ) 3 (0.73) > aluminum isopropoxide (0.65) and TEOS (0.84) > silicic acid (0.57). More Al pairs coordinated with protons or cobalt ions were essentially associated with better performances for N 2 O catalytic dissociation. Moreover, Si source had a significant effect on the location of Al pairs determined by UV–vis–DRS of bare Co (Ⅱ), Al pairs of ZSM-5 zeolite synthesized from TEOS were enriched in the sinusoidal channel (γ site), whereas those synthesized from silicic acid were concentrated in the channel intersections (6-MRs β site). The theoretical calculation revealed that the O 2 desorption at γ-site Co 2+ of ZSM-5 zeolite required to overcome less energy barrier (23.8 kcal/mol) than that at β-site one.
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Kaixuan Feng,Ruixiang Lin,Yuyan Hu,Yuheng Feng,Dezhen Chen,Tongcheng Cao
Hydrogen-based selective catalytic reduction (H 2 -SCR) is gaining attention for its environmental benefits, in response to increasingly stringent global N 2 O emission regulations. This study investigates the catalytic performance of alkali metal-activated char (K, Ca, Na) in reducing N 2 O using H 2 at temperatures below 200℃, through theoretical calculations and experimental validation. The study reveals that K, Na, and Ca exhibit distinct behaviors in terms of loading sites. K and Na preferentially decorates at edge sites due to differences in electron conjugation and atomic population, while Ca is more inclined to load at central positions, forming strong interactions with the char. These differences lead to variations in the N 2 O reduction pathways: K/Na-char primarily engages in physical adsorption, with N 2 O reduction proceeding through higher energy barriers, whereas Ca-char facilitates chemical adsorption of N 2 O with minimal energy barriers, displaying significant catalytic activity, Despite these differences, the study identifies a common rate-determining step across all systems, predominantly involving the removal of H 2 O. Notably, Ca-char achieves a substantial reduction in activation energy to 42.1 kJ/mol, compared to the partial reduction achieved by K/Na-char to 165.4–178.3 kJ/mol, from an initial 383 kJ/mol. Experimental validation corroborates the catalytic performance of all three alkali metals.
研究领域:
环境化学
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催化
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材料科学
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理论与应用化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2018
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IF 1.712
Jing Zhu,Lisong Fan,Lina Song,Fengqiu Chen,Dangguo Cheng
Developing effective iron-incorporated zeolites and determining their active centers for the direct oxidation of CH 4 to oxygenates have remained challenging topics so far. In this paper, we successfully prepare the highly-dispersed iron supported Y zeolites by a facile solid-state ion-exchange method with ferrocene, which was conducted under water-free conditions followed by a series of calcination . Moreover, extra-framework dinuclear Fe 2 + complexes are identified as so-called active α-iron sites on zeolites. ICP-OES, N 2 adsorption–desorption test, X-ray diffraction, solid-state 27 Al NMR, N 2 O titration, TEM, EPR and 57 Fe Mössbauer spectra were carried out to characterize properties of sample structure, acid sites, as well as the supported iron species. Characterization results indicate that high-temperature treatments have no effect on the typical structure feature of zeolites. Compared with catalysts synthesized by conventional impregnation, the samples prepared by the facile approach possess abundant dinuclear Fe 2 + complexes but no Fe 2 O 3 bulks and show weak acidity. These lead to a higher oxygenate selectivity in CH 4 oxidation to oxygenates. Remarkably, the oxygenate (HCHO and CH 3 OH) selectivity of 6.5% at 375°C can be eventually obtained.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Yuxin Sun,Yunshuo Wu,Haiqiang Wang,Zhongbiao Wu
Nitrous oxide (N2O) has gained increasing attention as a potent greenhouse gas, and its catalytic decomposition offers a promising mitigation strategy. In this study, single-atom Ru embedded in a rod-shaped CeO2 catalyst was synthesized via a H2O2 chemical etching strategy. The single-atom Ru catalyst demonstrated an exceptional N2O decomposition performance with only 0.48 wt % Ru loading, exhibiting a 34-fold increase in the turnover frequency compared to Ru nanoparticle catalysts. Under simulated exhaust conditions (NO, CO, and N2O), Ru1/CeO2 enabled complete conversion of all three pollutants at 280 °C. Mechanistic studies revealed that N2O decomposition over Ru1/CeO2 and Run/CeO2 followed the Mars–van Krevelen (MvK) and Langmuir–Hinshelwood (L–H) mechanisms, respectively. The exceptional N2O decomposition activity of the single-atom catalyst stems from enhanced O2 desorption through the recombination of oxygen atoms that dissociate from N2O with adjacent lattice oxygen. Notably, Ru1/CeO2 exhibits remarkable O2 tolerance due to the selective adsorption: N2O binds to single Ru atoms, whereas O2 occupies oxygen vacancies. In contrast, the high energy barrier associated with O2 combination and desorption in Run/CeO2 hindered N2O decomposition, and the competitive adsorption of O2 on its surface led to poor O2 resistance. This study demonstrates Ru1/CeO2 as an efficient catalyst for abating N2O and multipollutant removal.
研究领域:
催化化学
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环境化学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Mingyi Lu,Xiaoshuang Shi,Quan Feng,Xu Li,Shujuan Lian,Mengdan Zhang,Rongbo Guo
The aim of this work was to investigate the performance of a novel humic acid modified oyster shell (MOS) bulking agent on the digestate composting. MOS was prepared by immobilizing humic acid onto oyster shell using solid phase grafting method, and then applied to the composting process. Results showed more obvious degradation of lignocellulose was observed in the MOS treatment, which was probably due to the high relative abundance of Actinobacteria . Moreover, the addition of MOS could significantly preserve NH 4 + and reduce the NO 3 − generation with the decreasing abundance of ammonia-oxidizing bacteria and archaea. Besides, adding MOS reduced the N 2 O emission by 59.63% compared with the control. After composting, excitation-emission matrix fluorescence spectra demonstrated that the humification degree as well as compost maturity was enhanced with MOS added.
研究领域:
环境科学
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微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2021
·Vol. 102
·期 6
·2321-2329
·
IF 3.639
Jian Gao,Meng M Li,Guangyong Zhao
BACKGROUND Nitrous oxide (N 2 O) is a potent greenhouse gas depleting the stratospheric ozone. Previous studies reported that the thiocyanate (TC) excretion in the urine of cattle fed rapeseed meals containing glucosinolates was positively correlated with the N 2 O-nitrogen (N) emissions. The objectives of the experiment were to verify the effects and the mechanism of TC on the N 2 O-N emissions from the soil applied with artificial urine using static incubation technique. Four levels of TC, that is 0.00, 0.26, 0.78 and 2.33 mmol L −1 were composited in artificial urine as experimental treatments. Soil inorganic N and bacterial community were analyzed to elucidate the effects of TC on the N 2 O-N emissions of artificial urine. RESULTS Adding TC increased the N 2 O-N fluxes, the N 2 O-N to N application ratio, and the estimated N 2 O-N emissions from the soil applied with artificial urine both linearly and quadratically. The estimated N 2 O-N emission ( Y , in μmol) was increased with the TC adding level ( X , in μmol) in a quadratic manner: Y = 52.57 + 4.47 X − 0.123 X 2 ( R 2 = 0.70). Adding TC did not affect the soil bacterial diversity and richness, but increased the relative abundances of Nitrosomonas (both for nitrification and denitrification) and Hyphomicrobium , Lysobacter and Terrimonas (for denitrification), and tended to increase the relative abundances of denitrification and dissimilatory nitrate reduction to ammonium. CONCLUSION TC increased the N 2 O-N emissions of the soil applied with artificial urine possibly through enhancing the denitrification of nitrifiers in the soil. Field experiments are necessary to verify the laboratory results. © 2021 Society of Chemical Industry.
研究领域:
环境科学
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微生物学
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土壤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Xinyuan Ma,Haobo Bai,Guoxue Li,Lingling Li,Haofeng Meng,Yan Liu,Jing Yuan
In order to reduce N 2 O emissions during composting, the effects of different nitrification inhibitors (NI), dicyandiamide (DCD) and 3,4-dimethylpyrazole phosphate (DMPP), on compost maturity, N 2 O, and NH 3 emissions were studied under continuous incremental addition. This study used pig manure and corn straw as composting materials, based on the total nitrogen (TN) content of the initial mixture, two treatments were set: DCD (2.5% in the early phase and 5.0% in the maturation phase) and DMPP (0.25% in the early phase and 0.75% in the maturation phase) in a composting experiment. The results showed that adding DCD and DMPP did not affect the compost maturity, with the seed germination index (GI) of final compost reaching 80.76%–97.06%. Before the maturity period of compost, ammonia (NH 3 ) emissions accounted for 98.5%–99.4% of total emissions. Compared with the control group (CK), the addition of DCD and DMPP in the early stage reduced NH 3 emissions by 8.85% and 12.83%, respectively, by decreasing the ammonification rate. During the mature stage of composting, N 2 O emissions account for 95.6%–98.9% of the total emissions. The addition of DCD and DMPP delayed N 2 O emissions by 4 and 6 days, respectively, through nitrification inhibition. The DMPP amendment also reduced cumulative N 2 O emissions by 54.50% and increased the nitrogen content of the final compost. Correlation analysis showed that N 2 O was mainly originated from the denitrification of nitrification substrate (NO 2 − -N and NO 3 − -N). This study provides technical support for low-carbon management of agricultural waste.
研究领域:
环境科学
·
农业生态学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NEUROSCIENCE
·
2025
·
IF 4
Tianyi Yang,Yan Chen,Maolin Wang,Ren Ren,Fang Yan,Peng Xu,Bin Di
Nitrous oxide use Disorder（NUD）has recently received increasing social concern for its sharp rise among young people. However, the underlying mechanisms of NUD remain largely unexplored, which obstructs treatment strategy development and may exacerbate the epidemic of N2O abuse. Thus, specifying the essential mechanisms and targets in NUD are desperately needed. Here we unveiled a series of molecular adaptations regarding N2O reward memory in Nucleus accumbens (NAc) of mice through multi-omics approaches comprising transcriptomics, proteomics, metabolomics approaches. Our miRNA transcriptomics and pull-down proteomics analyzes uncovered that miR-7220-5p regulated N2O-induced conditioned-place preference (CPP) and associated increase of dendritic spine density in NAc of male mice. Our pull-down proteomics and metabolomics analyzes revealed that miR-7220-5p modulated ERK signaling pathway by directly binding with NR2B receptor. In summary, our work confirmed that restoring miR-7220-5p expression in NAc protected against synaptic abnormality via the NR2B/ERK/CREB signaling, thereby attenuating CPP behaviors in NUD. Selective inhibition of NR2B or ERK signaling blocked the reward memory of N2O-CPP via NAc microinjection. Our study proposed a potential therapeutic strategy for NUD and provided comprehensive resources of biological data to support future investigations of NUD treatment.Significance Statement Nitrous oxide Use Disorder (NUD) has recently received tremendously increasing social concern for its sharp rise among young people. Although the neurological consequences and their etiologies of consuming N2O have been well elucidated, the underlying mechanisms of NUD remain largely unexplored, which obstructs the development of clinical treatment strategies and may exacerbate the epidemic of N2O abuse. Our work uncovered the role of miR-7220-5p/NR2B/ERK/CREB signaling against synaptic abnormality/CPP behaviors. Selective inhibition of NR2B or ERK signaling blocked the reward memory of N2O-CPP via NAc microinjection. Our study proposed therapeutic targets for overcoming NUD behaviors and the omics data provided comprehensive biological resources to support future investigations of NUD.
研究领域:
神经科学
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分子生物学
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药理学
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生物信息学
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精神病学
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细胞信号传导
·
成瘾研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）