Journal of Energy Storage
·
2024
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IF 8.9
Yan Xiong,Haibang Zhang,Yan Qian,Yinzuo Wu,Ziyue Fu,Pingchun Guo,Hedong Jiang,Jiake Li,Yan-xiang Wang,Shijin Yu,Hua Zhu
Silicon (Si) exhibits significant potential as a high-capacity anode material for lithium-ion batteries. However, its commercial viability is hindered by challenges such as volumetric expansion during charge and discharge cycles, inadequate electrical conductivity, and a limited cycle life. To address these issues, the combination of Si with transition metal oxides and carbon coatings has proven to be an effective strategy for enhancing cycling performance. This paper presents a straightforward and cost-effective one-pot method for synthesizing Si@AMOA (Silicon composite carbon-coated amorphous manganese oxides) composites. The pores between the cross-linked nanorods can provide a large volume expansion space, and the embedded nanorods have strong Si C bonding, which can buffer the volume change of the Si active material, while the use of phenolic resin to form an amorphous carbon layer encapsulated with Si-composite amorphous MnO 2 improves electrical conductivity and stability, and the Si@AMOA anode material is loose and porous, with a large specific surface area, which is conducive to the ionic and electronic transport. The absence of the MnO 2 lattice leads to the presence of oxygen vacancies thus enabling the electrode material to have a better wettability with the electrolyte, which reduces the polarisation and improves the material's electrical conductivity, thus enabling the lithium to be rapidly intercalated/decalcified through the thin wall, thus improving its cycling stability performance. The Si@AMOA anode demonstrates a specific discharge capacity of 972.6 mAh g −1 after more than 600 cycles at a current density of 0.5 A g −1 , while exhibiting excellent electrochemical stability across varying current densities.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2021
·Vol. 18
·期 7
·3633
·
IF 3.39
Qianqian Lu,Nannan Zhang,Chen Chen,Miao Zhang,Dehua Zhao,Shuqing An
Lab-scale simulated biofilm reactors, including aerated reactors disturbed by short-term aeration interruption (AE-D) and non-aerated reactors disturbed by short-term aeration (AN-D), were established to study the stable-state (SS) formation and recovery after disturbance for nitrogen transformation in terms of dissolved oxygen (DO), removal efficiency (RE) of NH4+-N and NO3−-N and activity of key nitrogen-cycle functional genesamoA andnirS (RNA level abundance, per ball). SS formation and recovery of DO were completed in 0.56–7.75 h after transition between aeration (Ae) and aeration stop (As). In terms of pollutant REs, new temporary SS formation required 30.7–52.3 h after Ae and As interruptions, and seven-day Ae/As interruptions required 5.0% to 115.5% longer recovery times compared to one-day interruptions in AE-D and AN-D systems. According toamoA activity, 60.8 h were required in AE-D systems to establish new temporary SS after As interruptions, and RNAamoA copies (copy number/microliter) decreased 88.5%, while 287.2 h were required in AN-D systems, and RNAamoA copies (copy number/microliter) increased 36.4 times. FornirS activity, 75.2–85.8 h were required to establish new SSs after Ae and As interruptions. The results suggested that new temporary SS formation and recovery in terms of DO, pollutant REs andamoA andnirS gene activities could be modelled by logistic functions. It is concluded that temporary SS formation and recovery after Ae and As interruptions occurred at asynchronous rates in terms of DO, pollutant REs andamoA andnirS gene activities. Because of DO fluctuations, the quantitative relationship between gene activity and pollutant RE remains a challenge.Keywords:simulated biofilm reactor;stable state;nitrogen cycle;dissolved oxygen;gene activity
研究领域:
环境工程
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微生物学
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水处理
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DOI
PubMed
高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2017
·Vol. 40
·期 2
·763-776
·
IF 2.616
Wang Lanjun,Wang Jinhua,Zhu Lusheng,Wang Jun
The production of commercial livestock and poultry often involves using with antibiotics and feed additives, such as oxytetracycline (OTC) and copper (Cu). These are often excreted into the soil by animal feces; hence, combined pollutants may contaminate the soil. To evaluate single and combined toxic effects of OTC and Cu on the soil ecology, changes in quantities of bacteria, fungi, and actinomycetes in the soil were studied over a 28-d incubation period by a plate count method, microbes numbers counted on days 7, 14, 21, and 28. Abundances of ammonia monooxygenase ( amoA ) gene expression by ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA) in soil samples also were tested by real-time polymerase chain reactions (RT-PCRs) on day 21. The results revealed that the numbers of bacteria, fungi and actinomycetes and amoA genes copies of AOA and AOB were reduced seriously by exposure to Cu (1.60 mmol/kg). Similarly, the combined pollution treatments (mole ratios of OTC: Cu was 1:2, 1:8, and 1:32) also had inhibitory effect on bacteria, fungi, and actinomycetes numbers and amoA gene copies of AOA and AOB; the inhibitory rate was on obvious growth trend with the increasing mole ratios. Effects from single OTC pollution were found on bacteria (days 7 and 14), fungi (days 7, 14, 21, and 28), and AOA- amoA gene copies (day 21), with promotion at a low concentration (0.05 mmol/kg) and suppression at higher concentrations (0.2 and 0.8 mmol/kg). Also, numbers of bacteria, fungi, and actinomycetes decreased with longer culture times. Combining OTC and Cu led to a higher inhibition of soil microbes than when either chemical was used alone. However, there was no significant relationship between single and combined toxic chemicals because of their complicated interactions, either antagonistic or synergistic. The results also indicated the sensitivity of bacteria, fungi, actinomycetes on toxic chemicals existed difference and that the AOA were more tolerant than the AOB to these chemicals.
研究领域:
环境科学
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微生物学
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土壤生态学
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DOI
PubMed
高影响因子
CHEMOSPHERE
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2021
·
IF 7.086
Meiling Yi,Lilan Zhang,Cunli Qin,Peili Lu,Hongcheng Bai,Xinkuan Han,Shupei Yuan
Phenanthrene (PHE) is frequently detected in worldwide soils. But it is still not clear that how the microbial community succession happens and the nitrogen-cycling processes alter during PHE degradation. In this study, the temporal changes of soil microbial community composition and nitrogen-cycling processes during the biodegradation of PHE (12 μg g −1 ) were explored. The results showed that the biodegradation of PHE followed the second-order kinetics with a half-life of 7 days. QPCR results demonstrated that the bacteria numbers increased by 67.1%–194.7% with PHE degradation, whereas, no significant change was observed in fungi numbers. Thus, high-throughput sequencing based on 16 S rRNA was conducted and showed that the abundances of Methylotenera , Comamonadaceae , and Nocardioides involved in PHE degradation and denitrification were significantly increased, while those of nitrogen-metabolism-related genera such as Nitrososphaeraceae , Nitrospira , Gemmatimonadacea were decreased in PHE-treated soil. Co-occurrence network analysis suggested that more complex interrelations were constructed, and Proteobacteria instead of Acidobacteriota formed intimate associations with other microbes in responding to PHE exposure. Additionally, the abundances of nif H and nar G were significantly up-regulated in PHE-treated soil, while that of amo A especially AOA amo A was down-regulated. Finally, correlation analysis found several potential microbes ( Methylotenera , Comamonadaceae , and Agromyces ) that could couple PHE degradation and nitrogen transformation. This study confirmed that PHE could alter microbial community structure, change the native bacterial network, and disturb nitrogen-cycling processes.
研究领域:
环境微生物学
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土壤科学
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生物修复
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微生物生态学
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产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Wantong Zhang,Xiuping Tao,Zhengyi Hu,Enze Kang,Zhongqing Yan,Xiaodong Zhang,Jinzhi Wang
Alpine peatlands are recognized as a weak or negligible source of nitrous oxide (N 2 O). Anthropogenic activities and climate change resulted in the altered water table (WT) levels and increased nitrogen (N) deposition, which could potentially transition this habitat into a N 2 O emission hotspot. However, the underlying mechanism related with the effects is still uncertain. Hence, we conducted a mesocosm experiment to address the response of growing-season N 2 O emissions and the gene abundances of nitrification (bacterial amoA ) and denitrification ( narG , nirS , norB and nosZ ) to the increased N deposition (20 kg N ha −1 yr −1 ) at two WT levels (WT − 30 , 30 cm below soil surface; WT 10 , 10 cm above soil surface) in the Zoige alpine peatland, Qinghai-Tibetan Plateau. The results showed that the WT did not affect N 2 O emissions, and this was attributed with the limitation of soil NO 3 − . The higher WT level increased denitrification ( narG and nirS gene abundance) resulting in the depletion of soil NO 3 − , but the consequent NO 3 − deficiency further limited denitrification, while the WT did not affect nitrification (bacterial amoA gene abundance). Meanwhile, the N deposition increased N 2 O emissions, regardless of WT levels. This was associated with the N-deposition induced increase in denitrification-related gene abundances of narG , nirS , norB and nosZ at WT − 30 and narG at WT 10 . Additionally, the N 2 O emission factor assigned to N deposition was 1.3 % at WT − 30 and 0.9 % at WT 10 , respectively. Our study provided comprehensive understanding of the mechanisms referring N 2 O emissions in response to the interactions between climate change and human disturbance from this high-altitude peatland.
研究领域:
环境科学
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生态学
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微生物生态学
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气候变化
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DOI
PubMed
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Zizhang Guo,Yan Kang,Haiming Wu,Mei Li,Zhen Hu,Jian Zhang
Polycyclic aromatic hydrocarbon (PAHs) are persistent organic pollutants and pose high risk in aquatic environment. The utilization of biochar is a strategy for PAHs-contaminated remediation but is challenging due to the adsorption saturation and reoccurrence of PAHs desorbed back into water. In this study, iron (Fe) and manganese (Mn) were provided as electron acceptors for biochar modification to enhance anaerobic biodegradation of phenanthrene (Phe). Results revealed that, the Mn(Ⅳ) and Fe(Ⅲ) modification improved the removal of Phe by 24.2% and 31.4% than that of biochar, respectively. Additionally, nitrate removal was improved by 19.5% with Fe(Ⅲ) amendment. The Mn-and Fe-biochar decreased Phe contents by 8.7% and 17.4% in sediment, 10.3% and 13.8% in biochar than that of biochar. Much higher DOC contents were observed with Mn- and Fe-biochar, which provided bioavailable carbon source for microbes and contributed to microbial degradation of Phe. The greater degree of humification , higher proportions of humic and fulvic acid like components in metallic biochar participated in electron transport and further enhancing the degradation of PAHs. Microbial analysis proved the high abundance of Phe-degrading bacteria (e.g. PAH-RHD α , Flavobacterium and Vibrio ), nitrogen removal microbes (e.g. amoA , nxrA , and nir ), Fe and Mn bioreduction or oxidation (e. g. Bacillus , Thermomonas , Deferribacter ) with metallic biochar. Based on the results, the Fe and Mn modification, especially Fe-modified biochar provided well performance for PAHs removal in aquatic sediment.
研究领域:
环境科学
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生物修复
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水生生态学
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微生物学
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产品关联
DOI
PubMed
高影响因子
Frontiers in Cellular and Infection Microbiology
·
2016
·
IF 5.218
Dong Yuhao,Liu Jin,Pang Maoda,Du Hechao,Wang Nannan,Awan Furqan,Lu Chengping,Liu Yongjie
The growth-stimulating effects of catecholamine stress hormones have been demonstrated in many pathogens. However, catecholamine-induced growth and its underlying mechanisms remain poorly understood in Aeromonas hydrophila. The present study sought to demonstrate that norepinephrine (NE), epinephrine (Epi), dopamine (Dopa), and L-dopa stimulate the growth of A. hydrophila in iron-restricted media containing serum. NE exhibited the strongest growth stimulation, which could be blocked by adrenergic antagonists. Furthermore, it was demonstrated that NE could sequester iron from transferrin, thereby providing a more accessible iron source for utilization by A. hydrophila. The deletion of the amoA gene associated with amonabactin synthesis revealed that the amonabactin siderophore is not required for NE-stimulated growth. However, the deletion of the TonB2 energy transduction system resulted in the loss of growth promotion by NE, indicating that a specific TonB-dependent outer membrane receptor might be involved in the transport of iron from transferrin. Collectively, our data show that catecholamine sensing promotes the growth of A. hydrophila in a manner that is dependent on the TonB2 energy transduction system.
研究领域:
微生物学
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分子生物学
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传染病学
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产品关联
DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2021
·
IF 6.291
Rui Tao,Hanjie Zhang,Xiuping Gu,Baowei Hu,Jun Li,Guixin Chu
Phthalic acid esters (PAEs) pollution has become an increasing issue worldwide, but little is known about its effects on ammonia-oxidizers and nitrous oxide (N 2 O) in the soil environment. Here, a 50-day soil microcosm experiment was conducted using low and high doses bis (2-Ethylhexyl) phthalate (DEHP) to estimate the effect of DEHP exposure on soil N 2 O emissions and the nitrifying community in calcareous soil. The results showed that DEHP exposure at 10 and 100 mg kg -1 doses significantly reduced N 2 O by 67.5% and 73.6%, respectively, relative to the DEHP absent treatment. The microbial biomass carbon and nitrogen (MBC and MBN) were consistently and significantly decreased with DEHP exposure at 5, 22, and 50 days after incubation, especially with high-dose. The bipartite association networks showed that DEHP exposure changed the compositions of both ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) communities. Moreover, the AOA and AOB amoA gene abundances were significantly decreased by DEHP addition to the soil ( P < 0.05). Random forest modeling showed that the AOB Shannon index and pH were the most important biotic and abiotic factors affecting N 2 O emissions in the soil with DEHP exposure, respectively. Partial least squares path modeling (PLS-PM) demonstrated that the reduction of N 2 O emissions due to DEHP exposure was mainly ascribed to the changes of the AOB community. The results from this study highlight the toxicity of DEHP on the ammonia oxidizers, and its mitigating effect on N 2 O emissions in the soil where ammonia-oxidation is largely driven by AOB.
研究领域:
环境科学
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土壤微生物学
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生态毒理学
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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）