BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Li Zhang,Lixia Yang,Tingjun Dong,Jiachun Yang,Quanhao Dou,Shou-Qing Ni,Yongzhen Peng
The substantial discharge of ferroferric oxide nanoparticles (Fe 3 O 4 NPs) into sewage threatens the survival of functional microorganisms in wastewater treatment. This study elucidated responses of anaerobic ammonium oxidation (anammox) consortia to inhibition from high Fe 3 O 4 NPs concentration and recovery mechanisms. The nitrogen removal efficiency decreased by 20.3 % and recovered after 55 days under 1000 mg/L Fe 3 O 4 NPs concentration. Toxicity was attributed to reactive oxygen species (ROS) production. The excessive ROS damaged membrane integrity, nitrogen metabolism, and DNA synthesis, resulting in the inhibition of anammox bacteria activity. However, recovery mechanisms of anammox consortia activity were activated in response to 1000 mg/L Fe 3 O 4 NPs. The increase of heme oxygenase-1, thioredoxin, and nicotinamide adenine dinucleotide-quinone oxidoreductase genes alleviated oxidative stress. Furthermore, the activation of metabolic processes associated with membrane and DNA repair promoted recovery of anammox bacteria activity. This study provided new insights into NPs contamination and control strategies during anammox process.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy Technology
·
2019
·Vol. 7
·期 9
·1900374
·
IF 3.163
Zhong Ma,Dewang Zeng,Shuai Zhang,Rui Xiao
NiFe 2 O 4 oxygen carrier (OC) presents higher oxygen carrying capacity than single metal oxides (NiO and Fe 2 O 3 ). However, the redox ability of NiFe 2 O 4 gets deactivated due to phase segregation. Herein, the investigation of the effect of supports (CeO 2 , CeZrO 2 , and ZrO 2 ) on the phase stability and the redox performance of NiFe 2 O 4 during the chemical looping (CL) process are presented. The structure of NiFe 2 O 4 -based OCs is characterized using different characterization methods. The CL reaction is conducted in a fixed-bed reactor at 900 °C under alternate 5% CO/N 2 and 5% O 2 /N 2 atmospheres. The results indicate that the redox performance and the phase stability of NiFe 2 O 4 -based OCs are significantly affected by the supports. According to experimental results, CeO 2 can improve the oxygen mobility of NiFe 2 O 4 . The CeO 2 –NiFe 2 O 4 OC has the best performance in terms of both recyclability and phase stability during the redox cycles. The results show that CeO 2 –NiFe 2 O 4 can reduce the tendency of Fe segregation due to the high concentration of oxygen vacancies. It can be reduced and reoxidized to the original crystalline phase of NiFe 2 O 4 . Nevertheless, the CeZrO 2 –NiFe 2 O 4 and ZrO 2 –NiFe 2 O 4 OCs have drawbacks related to serious sintering and phase segregation into Fe 2 O 3 .
研究领域:
材料科学
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化学工程
·
能源化学
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催化化学
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无机化学
✓ 已验证
DOI
高影响因子
Science China-Technological Sciences
·
2022
·Vol. 65
·期 10
·2317-2324
·
IF 3.903
Gao HongMei,Xiao MeiLing,Li GuoQiang,Gao LiQin,Meng QingLei,Luo ZhaoYan,Luo ErGui,Liu ChangPeng,Jin Zhao,Ge JunJie,Xing Wei
The material innovation is prerequisite to accelerating sluggish oxygen evolution reaction (OER) kinetics, thus promoting the realization of hydrogen energy community. Herein, we develop an oxygen-vacancy-rich TiO 2 supported RuO 2 catalyst (RuO 2 @r-TiO 2 ) towards improved OER activity and stability. The oxygen vacancy on TiO 2 not only supplies electrons to produce lower valence Ru, but also provides sufficient anchoring site for the deposition of RuO 2 nanocrystal. Beyond that, it can generate strong electronic interaction between TiO 2 and supported RuO 2 , and thereby tailors the intermediates’ adsorption energy on the RuO 2 surface. As a result, the derived RuO 2 @r-TiO 2 catalyst exhibits superior OER activity and stability with the overpotential of 211 mV at a current density of 10 mA cm −2 and negligible activity degradation after 6 h operation, outperforming the non-oxygen-vacancy counterpart (223.3 mV, 12.75% activity loss) and RuO 2 catalyst (234.6 mV, 42.86% activity loss).
研究领域:
材料科学
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电化学
·
催化化学
·
能源材料
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纳米科技
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物理化学
✓ 已验证
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 30
·期 5
·1553-1565
·
IF 1.637
Liu Yong,Wei Ya,Liu Rongjuan,Liang Zhaopeng,Yang Jun,Zhang Ruilong,Zhou Zhiping,Nie Yijing
A new kind of epoxidized natural rubber (ENR) nanocomposites with enhanced aging resistance by the inclusion of a non-migratory anti-aging agent was prepared. The non-migratory anti-aging agent was obtained by immobilizing antioxidant molecules on graphene oxide (GO) surface using a silane coupling agent. In this way, the diffusion of the small-molecule antioxidants is restricted, leading to low loss of antioxidants in rubber service and the improvement of rubber aging resistance. GO, due to its unique two-dimensional planar structure, forms barrier layers inside the composite to prevent gas diffusion, which also contributes to the enhancement in anti-aging properties. In addition, hydrogen bond networks form between ENR chains and GO nanosheets, limiting the movement of the non-migratory anti-aging agents and improve their stability in rubber matrix. Our experimental results demonstrated that the non-migratory anti-aging agents can endow rubbers with better resistance to thermo-oxidative aging than the conventional antioxidants with a same amount.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2024
·
IF 8
Qiaoling Xing,Xujie Chen,Yong Cai,Ming Zhang
As a kind of green energy, hydrogen (H 2 ) has been widely concerned and applied by people. One of the biggest challenges for sensing applications is the quick detection of hydrogen leaks or their release in various conditions, particularly in large electric vehicle batteries. This study successfully constructed a quick response and recovery hydrogen sensor based on the In 2 O 3 -SnO 2 heterojunction. The response and recovery time of the In 2 O 3 -SnO 2 hydrogen sensor is 1.1/1.9 s to 50 ppm H 2 . This is reduced to 11.0 %/9.5 % compared to the SnO 2 hydrogen sensor. This sensor's remarkable gas detecting properties are mainly attributed to the In 2 O 3 -SnO 2 heterojunction creation, crystal structure modification, and increased specific surface area (92.9 m 2 /g). Homogenous In 2 O 3 -SnO 2 nanocomposites contain more oxygen defects, which is the primary factor enhancing the sensor's ability to detect gases. Firstly, indium ions are incorporated in the lattice of SnO 2 results in lattice distortion and enhances the presence of oxygen deficiency in the composites, which plays a pivotal role in achieving rapid response and recovery of the sensor. Secondly, In 2 O 3 -SnO 2 heterostructures promote rapid adsorption of oxygen molecules and target gases by facilitating effective electron mobility on their surface. The quicker response and recovery times of hydrogen sensors based on In 2 O 3 -SnO 2 heterojunctions are observed. This innovative approach to creating fast-responding gas sensors highlights the promise of heterojunction-based hydrogen sensors for real-time H 2 monitoring and opens up new research directions.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Fuyuan Qi,Weiping Yang,Lan-Lan Lou,Shuangxi Liu,Kai Yu
Oxygen vacancies play an important role in the oxidation of biomass-derived alcohols and aldehydes using ceria-based catalysts. In this study, a highly oxygen vacancy-defective Pt/H-CeO 2 catalyst was synthesized by a straightforward strategy that involved the control of the addition of ascorbic acid and nitric acid. The addition of ascorbic acid, which acted as a pore-forming agent, promoted the hydrolysis, crystallization, and subsequent growth of Ce precursor salt, resulting in the synthesis of H-CeO 2 with abundant oxygen vacancy defects and a porous thin sheet-like morphology. However, the addition of nitric acid significantly inhibited the generation of oxygen vacancy defects. The obtained H-CeO 2 exhibited significantly increased oxygen vacancy content, active oxygen species, and specific surface area compared with CeO 2 with lower oxygen vacancy defects (L-CeO 2 ). These remarkable features led to enhanced catalytic activity of Pt/H-CeO 2 for the oxidation of 5-hydroxymethylfurfural (HMF) compared with Pt/L-CeO 2 . This can be mainly attributed to the enhanced adsorption and activation of O 2 molecules by abundant oxygen vacancies, allowing more active oxygen species to participate in the dehydrogenation of HMF. This work provides an example of oxygen defect engineering for ceria-based catalysts to boost the catalytic selective oxidation performance.
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
Pharmaceuticals
·
2024
·Vol. 17
·期 10
·1257
·
IF 4.3
Tibor Maliar,Marcela Blažková,Jaroslav Polák,Mária Maliarová,Eva Ürgeová,Jana Viskupičová
Background: The balance between antioxidants and pro-oxidants plays a significant role in the context of oxidative stress, influenced by both physiological and non-physiological factors. Objectives: In this study, 18 prescribed antibiotics (including doxycycline hydrochloride, tigecycline, rifampicin, tebipenem, cefuroxime, cefixime, potassium clavulanate, colistin, ampicillin, amoxicillin, amikacin, nalidixic acid, azithromycin, pipemidic acid trihydrate, pivmecillinam, aztreonam, fosfomycin sodium, and ciprofloxacin) were subjected to simultaneous determination of antioxidant and pro-oxidant potential to assess if pro-oxidant activity is a dominant co-mechanism of antibacterial activity or if any antibiotic exhibits a balanced effect. Methods: This study presents a recently developed approach for the simultaneous assessment of antioxidant and pro-oxidant potential on a single microplate in situ, applied to prescribed antibiotics. Results: Ten antibiotics from eighteen showed lower antioxidant or pro-oxidant potential, while five exhibited only mild potential with DPPH50 values over 0.5 mM. The pro-oxidant antioxidant balance index (PABI) was also calculated to determine whether antioxidant or pro-oxidant activity was dominant for each antibiotic. Surprisingly, three antibiotics—doxycycline hydrochloride, tigecycline, and rifampicin—showed significant measures of both antioxidant and pro-oxidant activities. Especially notable was tebipenem, a broad-spectrum, orally administered carbapenem, showed a positive PABI index ratio, indicating a dominant antioxidant over pro-oxidant effect. Conclusions: These findings could be significant for both therapy, where the antibacterial effect is enhanced by radical scavenging activity, and biotechnology, where substantial pro-oxidant activity might limit microbial viability in cultures and consequently affect yield.
研究领域:
药理学
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微生物学
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生物化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 81
·51142-51150
·
IF 3.108
Ruilian Li,Jian Zhao,Fengxia Yang,Yingchao Zhang,Daniele Ramella,Yu Peng,Yi Luan
A novel magnetic Fe3O4@P4VP(poly(4-vinylpyridine))@FeCl3 core–shell structure was successfully synthesized. Its Fe3O4@P4VP core was initially prepared via polymerization of 4-vinyl pyridine on the surface of Fe3O4 microspheres. The successful introduction of the FeCl3 moiety as a catalytic active site was achieved through coordination interaction between P4VP and FeCl3. The obtained Fe3O4@P4VP@FeCl3 catalyst was applied in the selective oxidation of alcohols using molecular oxygen as the oxidant. It was shown that a variety of alcohol substrates is tolerated under optimized reaction conditions. Additionally, benzylic oxidation of hydrocarbon compounds was also evaluated using Fe3O4@P4VP@FeCl3 as the catalyst and tBuOOH as the oxidant, achieving high yields and very good selectivities. The heterogeneity of the Fe3O4@P4VP@FeCl3 core–shell catalyst was tested and the initial activity was maintained after five reuses.
研究领域:
化学
·
催化科学
✓ 已验证
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 7
·1078
·
IF 3.9
Ze Hong,Jingying Ouyang,Jiaxin Li,Han Zheng,Ying Liu
Multi-heterojunctions are more promising than single heterojunctions in photocatalysis due to the availability of more interfaces between each component. However, photocatalytic activity is highly dependent on the contact mode of individual components. In this work, we assembled gold nanoparticles/oxygen-deficient (anatase/B-phase) TiO2multi-heterojunction microspheres using spray pyrolysis and focused on their contact mode-governed photocatalytic activity. The results reveal that using oxygen-deficient (anatase/B-phase) TiO2microspheres as building blocks could significantly enhance the absorption of visible light and the photocatalytic activity of a gold–TiO2system toward the photocatalytic carbon monoxide oxidation. Furthermore, loading gold nanoparticles onto B-phase TiO2could facilitate a more prominent enhancement of activity than that of pure B-phase TiO2, benefiting from the two-electron reduction of oxygen at the interface of TiO2/Au. Meanwhile, the high crystallinity of B-phase TiO2microspheres allows for a gold loading amount of 1 wt% in the gold/(anatase/B-phase) TiO2system, which is 1.67 times more active than pure B-phase TiO2microspheres, in the photocatalytic oxidation of carbon monoxide to generate carbon dioxide.Keywords:photocatalytic carbon monoxide oxidation;B-phase TiO2;oxygen-deficient;microspheres
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yinghong Luo,Caiyue Zhao,Wanglai Cen,Yanshi Zhang,Guannan Huo,Xiaoya Wang,Hanyue Ma,Yipeng Wang,Daiqi Ye,Junliang Wu
Metal oxide-loaded catalysts are extensively used for room temperature catalytic oxidation of H 2 S due to their strong affinity for H 2 S, but tend to exhibit poor activity due to uneven dispersion. Herein, a series of nitrogen and MgO co-modified activated carbon was synthesized using the co-impregnation method. The desulfurization efficiency of the optimal material exceeded the individual contributions of nitrogen doping and MgO loading by nearly 25 %, achieving a remarkable 742.67 mg/g. This enhancement was partly attributed to the synergistic interaction between electron-rich pyridine N and MgO, promoting oxygen vacancies formation, which favored O 2 activation. Moreover, the substitutional nitrogen defects in MgO induced the formation of adjacent magnesium vacancies, increasing the number of strong basic sites favorable for H 2 S dissociation. The modification strategy adopted in this study is also applicable to commercial activated carbon, providing a feasible approach for developing cost-effective low-temperature technology.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yao Lv,Aoran Li,Jiajie Ye,Haifeng Wang,Peijun Hu,Kuan-Wen Wang,Yun Guo,Xuan Tang,Sheng Dai
Atomic-scale insights into the interactions between metals and supports play a crucial role in optimizing catalyst design, understanding catalytic mechanisms, and enhancing chemical conversion processes. The effects of oxide support on the dynamic behavior of supported metal species during pretreatments or reactions have been attracting a lot of attention; however, very less systematic integrations are carried out experimentally using real catalysts. In this study, we here utilized facet-controlled CeO2 as examples to explore their influence on the supported Pt species (1.0 wt %) during the reducing and oxidizing pretreatments that are typically applied in heterogeneous catalysts. By employing a combination of microscopy, spectroscopy, and first-principles calculations, it is demonstrated that the exposed crystal facets of CeO2 govern the evolution behavior of supported Pt species under different environmental conditions. This leads to distinct local coordinations and charge states of the Pt species, which directly influence the catalytic reactivity and can be leveraged to control the catalytic performance for CO oxidation reactions.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Zhao Li,Lei Wu,Min Chen,Qiwu Zhang,Shujuan Dai,Tonglin Zhao
Bismuth oxyiodide is one of the bismuth-based semiconductors which exhibits narrow band gaps and excellent visible light response, however modification strategies are usually desired for improving its photocatalytic reactivity. In this context, introduction of valuable components into the interlayer of BiOI is expected to work, considering its typical layered structure. In this case, mechanochemical synthesis of BiOI, with simultaneous introduction of lanthanum into its interlayer to form Bi 1-x La x OI, was conducted for the first time, and arsenic (As(III)) was selected to evaluate the photocatalytic reactivity, demonstrating excellent reaction efficiency for arsenic oxidation under a mild condition. Characterizations confirmed the incorporation of La and the presented well crystalline structure of Bi 1-x La x OI, and revealed its better visible light absorption capacity than raw BiOI. Besides the excellent electronic conductivity of Bi 0.9 La 0.1 OI, photogenerated holes (h + ) and superoxide radical species (· O 2 - ) were characterized by electron spin resonance (ESR) test, to act as predominant reactive groups during the photo-induced oxidation reaction. These findings provided a novel concept for the interlayer decoration of BiOI, and offered an alternative approach to develop its potential application for the removal of hazardous arsenic pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）