SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Yalei Ding,Jiejie Wang,Shanshan Xu,Kun-Yi Andrew Lin,Shaoping Tong
In order to completely mineralization of contaminants, it is necessary to develop new methods which can effectively degrade final products of chemical oxidation. Acetic acid (HAc) has been considered one of the typical end products of chemical oxidation of pollutants and thus chosen as a representative target pollutant in the study. Nano-cerium oxide (CeO 2 ), an environment-friendly rare-earth material, was prepared to catalytic ozonation of HAc in acidic solutions. Experimental results show that the prepared CeO 2 could greatly enhance efficiency of H 2 O 2 /O 3 , and also have good stability and recyclability. The Raman spectra indicate that H 2 O 2 interacts with oxygen vacancies of CeO 2 to form peroxide-like species, which could effectively initiate the decomposition of ozone to produce hydroxyl radicals. A mechanism is proposed to explain the activity of peroxide-like species for the decomposition of ozone. The effects of different parameters such as initial pH value, catalyst dosage, and the concentration of H 2 O 2 are also investigated. The results indicate that the CeO 2 /H 2 O 2 /O 3 may provide a convenient and effective method for degrading refractory organic pollutants in acidic wastewaters.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Rui Zhang,Changlin Liu,Ruoxi Zhao,Yaqian Du,Dan Yang,He Ding,Guixin Yang,Shili Gai,Fei He,Piaoping Yang
There is an urgent need to develop photosensitive nanoenzymes with better phototherapeutic efficiency through simple processes. By exploiting semiconductor catalysis and defect chemistry principles, herein, a MnMoO x composite semiconductor nanoenzyme was developed to achieve a fully integrated theranostic nanoenzyme for highly efficient photo/chemo-enzyme-dynamic eradication of deep tumors. Relative to iron oxides, manganese oxides offer ideal catalytic performance under near-neutral conditions, which helps to broaden the suitable pH range of the MnMoO x nanoenzyme for antitumor therapy. Furthermore, with the assistance of glutathione depletion, Mn 4+ /Mo 6+ was successfully converted to Mn 2+ /Mo 5+ , inhibiting the scavenging of reactive oxygen species (ROS) and promoting cycling. Therefore, MnMoO x has favorable catalase (CAT)-like activity and oxidase (OXD)-like activity in the tumor microenvironment (TME) for promoting the “H 2 O 2 O 2 O 2 − ” and “H 2 O 2 OH” cascade reactions. The abundant oxygen vacancy defects also promote the surface plasmon resonance (SPR) effect in the second near-infrared (NIR-II) window of MnMoO x , which significantly enhanced its photothermal therapy (PTT) effect and catalytic activity. In detail, ROS production was significantly enhanced due to the adsorption of water and oxygen molecules by the rich oxygen vacancies of MnMoO x . MnMoO x also exhibited excellent multi-modal imaging activity (including computed tomography (CT), magnetic resonance imaging (MRI), and photoacoustic (PA)), which can be exploited to better guide the administration of medication.
研究领域:
生物医学工程
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纳米医学
·
肿瘤治疗
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2025
·
IF 4.9
Yi Zhong,Zhihua Ying,Yan Liu,Chenhan Zhang,Wenjun Yan,Yuan Jiang
Conventional metal oxide semiconductor gas sensors are inherently limited by their dependence on high operating temperatures (200–400℃), which leads to increased energy consumption and reduced long-term device stability. To overcome these challenges, this study presents a glycine-assisted solvent evaporation synthesis route for the preparation of highly dispersible WO 3 nanoparticles. Glycine acts dually as a crystallographic modulator during nanoparticle growth and as an interfacial stabilizer, allowing for control over both particle size and oxygen vacancy concentration. Subsequent annealing removes residual glycine while preserving the optimized nanostructure. The optimized 6-WO 3 sensor synthesized using 6 mmol glycine exhibits remarkable low-temperature sensing performance, demonstrating a response value of 270.9 toward 3 ppm NO 2 at a reduced operating temperature of 120°C compared to conventional WO 3 -based counterparts while maintaining high sensitivity. Systematic characterization links this energy-efficient performance to synergistic effects between enhanced gas diffusion pathways, evidenced by a BET surface area of 20.59 m 2 /g, and precise modulation of electron depletion layers via glycine-mediated oxygen vacancy engineering. This work advances a practical paradigm for designing metal oxide semiconductor sensors that harmonize high sensitivity with operational sustainability, highlighting their transformative potential in next-generation environmental monitoring systems.
研究领域:
材料科学
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环境科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Qinghe Liu,Sen Wang,Fei Han,Shupei Lv,Daokui Li,Jing Ouyang
Manganese oxide has been recognized as one of the most promising gaseous heterogeneous catalysts due to its low cost, environmental friendliness , and high catalytic oxidation performance. The modulation of the interfacial coupling effect of manganese oxides by chemical means is considered a critical and effective way to improve the catalytic performance. Herein, a novel one-step synthetic strategy of highly-efficient ultrathin manganese-based catalysts is proposed through optimal regulation of metal/manganese oxide multi-interfacial coupling. Carbon monoxide (CO) and propane (C 3 H 8 ) oxidation are employed as probe reactions to investigate the structure-catalytic mechanism - catalytic performance relationship. The ultrathin manganese (Mn)-based catalyst exhibits superior low-temperature catalytic activity with a 90% conversion of CO/C 3 H 8 realized at 106℃ and 350℃. Subsequently, the effect of “interfacial effect” on the intrinsic properties of manganese oxides is revealed. The ultrathin appearance of two–dimensional (2D) manganese dioxide (MnO 2 ) nanosheets changes the binding force in the vertical direction, thus resulting in an increase in the average manganese-oxygen (Mn-O) bond length and exposing more surface defects . Besides, the introduction of Copper (Cu) species into the catalyst further weakens the Mn-O bond and promotes the generation of oxygen vacancies , which subsequently enhances the oxygen migration rate. This study provides new insights into the optimal design of transition metal oxide interfacial assemblies for efficient catalytic reactions .
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Jianwang He,Zhijin Cheng,Zhuo Liu,Meijuan Yin,Yuchi Zhang,Le Han,Yan Xu
Although metal oxides based gas sensors have been researched extensively in previous works, there are enormous challenges on improving the deficiencies in poor selectivity, sensitivity, humidity resistance and so on. Hence, we developed an epitaxial growth method to prepare dendritic Co 3 O 4 /In 2 O 3 -(1−3) heterostructures of distinct Co/In mass ratios through perfect lattice matching between the two crystal domains at the interface, along with introducing large amounts of oxygen vacancies . As a result, the Co 3 O 4 /In 2 O 3 -2 heterostructure based gas sensor showed enhanced sensing properties towards triethylamine (TEA, 100 ppm) with a high response value of Ra/Rg = 576.1 at an optimal working temperature of 200 °C, which is 93 times higher than that of pristine In 2 O 3 . Moreover, the Co 3 O 4 /In 2 O 3 -2 sensor exhibited excellent gas selectivity, quick recovery time, repeatable cycling, long-term stability, as well as outstanding humidity resistance. The improved TEA gas sensing performance can be attributed to the integration of interfacial synergies in Co 3 O 4 /In 2 O 3 p-n heterostructure and generation of rich oxygen vacancies, exposing more active sites to facilitate the adsorption/desorption of gas molecules. This work provides a feasible pathway to regulate TEA sensing performance of metal oxide semiconductor (MOS) gas sensors by capitalizing on self-sacrificial template strategy and reconstruction of novel metal oxide heterostructure.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2021
·
IF 9.709
Juan Yang,Pengyu Chen,Jun Dai,Yumei Chen,Liqing Rong,Dazhao Wang
Sunlight-driven photocatalysis is regarded as a promising strategy for direct conversion of methane in low concentration coal mine methane (LC-CMM) to value-added methanol, yet remains a grand challenge to efficiently activate and convert methane. Herein, WO 3−x nanosheets with gradient concentration of oxygen vacancy were synthesized and firstly served as full-spectrum responsive catalysts for transformation of LC-CMM to methanol at ambient conditions. Defect-rich WO 3−x -N2.0 shows a methanol yield of 1475 μmol·g −1 , roughly 4.5 times higher than WO 3 -A2.0 under simulated solar light irradiation. The selectivity of CH 3 OH on the optimal WO 3−x -N2.0 is up to 76%. More importantly, WO 3−x -N2.0 exhibits a methanol yield of 396 μmol·g −1 with the selectivity of 82% even under near infrared light irradiation while almost no CH 3 OH is detected over WO 3 -A2.0. Based on the results of energy-band structure, photoelectrochemical characterization, PLs and EPR tests, the significantly enhanced photocatalytic performance over WO 3−x -N2.0 is ascribed to the synergistic effect caused by the formation of oxygen vacancies, including extending light absorption into NIR region, improving separation of photoinduced electron-hole pairs and boosting production of hydroxyl radicals (key active species that drive CH 3 OH production). This work will offer a sustainable pathway to broaden the utilization of LC-CMM via efficient coupling of solar energy.
研究领域:
化学工程
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能源科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Xu Yin,Renping Li,Wei Li,Zhifeng Gao,Kajia Wei,Hongwei Zhu,Liankai Gu,Yun Jiang,Weiqing Han
Br − -containing wastewater has the risk of increasing Br − levels in receiving bodies if released into aquatic environments. Electrochemical oxidation is regarded as an ideal method for Br − removal and Br 2 extraction because of its simple procedure and high efficiency. In this work, a novel oxygen vacancy enriched Ti/O v -Co 3 O 4 -NRs electrode was fabricated and used for Br − removal and Br 2 extraction in Br − -containing wastewater. Characterization and experimental results showed that the Ti/O v -Co 3 O 4 -NRs electrode has more prominent bromine evolution reaction (BER) performance than several commercial electrodes (graphite, Ti/RuO 2 -Ir, Ti/PbO 2, etc.). Notably, the construction of oxygen vacancies obviously accelerated the removal of Br − (53 % improvement) by facilitating Br − adsorption and electron transfer. In addition, the influence factors such as initial pH, initial Br − concentration, current density, coexisting ions and temperature on Br − removal were optimized. The Ti/O v -Co 3 O 4 -NRs electrode also exhibited highly stable catalytic activity and conductivity. After 10 cycles, the removal rate of Br − decreased by 2.20 %, and the yield of Br 2 decreased by 3.6 %. In actual applications, the unit energy consumption reached 1.59–1.76 kJ·g −1 Br, and the current efficiency remained above 70 % throughout the whole treatment process. In addition, >80 % of the TOC could be removed during Br 2 extraction, which was more acceptable than the current reported experimental value of electrochemical Br 2 extraction and exhibited great application prospects.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Gaokui Chen,Qiuwan Shen,Xin Zhang,Tianyun Zhao,Kuanyu Zhu,Shian Li
Methanol steam reforming (MSR) is an effective way to provide high purity hydrogen for PEMFCs, however the main challenge is the toxic effect of CO. In this study, CuGa 2 O 4 spinel catalyst was applied first for MSR at low temperature. The properties of catalysts were characterized by various techniques, the MSR catalytic performance was also studied in deeply. The surface of the catalyst is composed of particle chains that are interconnected, forming high-volume pores that increase the specific surface area. The catalyst also has a rich porous structure, exposing more active sites. Furthermore, the presence of oxygen vacancies facilitates the adsorption of reactive oxygen species, reducing CO generation. A possible pathway for methanol dehydrogenation has been determined using DFT calculations. The relatively low overall energy barrier on the catalyst surface facilitates methanol activation. Among the steps, formaldehyde dehydrogenation is the rate-determining step in the methanol dehydrogenation process. The CuGa 2 O 4 catalyst exhibits good gas selectivity, with a hydrogen selectivity of 98 % and CO selectivity of 0. and no deactivation occurred within 50 h, demonstrating outstanding durability. These features allow it to serve as an efficient catalyst for MSR online hydrogen production and direct supply to PEMFCs.
研究领域:
催化化学
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能源材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2024
·Vol. 14
·期 10
·2722-2729
·
IF 4.4
Yuqiao Li,Dezheng Li,Huimin Liu,Yiming Lei,Rongda Zhao,Dehua He,Ze Zheng,Hui Luo,Aidi Liu
Photothermal dry reforming of methane (DRM), as an emerging branch of heterogeneous catalysis, could effectively convert CO2 and CH4 into high-value-added chemicals via the synergistic effect between thermochemical and photochemical processes. Herein, we report that loading Rh nanoparticles (NPs) on Ga2O3−x with oxygen vacancies improves CO2 conversion efficiency through photo-assisted DRM. On the Rh/Ga2O3−x catalyst, the photothermal catalytic CO2 conversion rate (112.0 μmol g−1 min−1) is 1.6 times that of the thermal reaction at 500 °C (71.9 μmol g−1 min−1). Rh2O3 and Ga2O3 as precursors are in situ reduced to Rh NPs and Ga2O3−x under the reductive DRM reaction atmosphere, respectively. Characterization results indicate that Rh NPs accelerate the DRM process by enhancing light absorption ability and charge transfer efficiency. Meanwhile, the oxygen vacancies in Ga2O3−x are beneficial for activating reactant molecules rapidly. In situ DRIFTS spectra showed that Rh NPs and oxygen vacancies served as reduction and oxidation sites during the photothermal DRM process. This work paves the way for the rational design of better photothermal catalysts in the future.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Xiaoya Yang,Xiaodan Zhang,Yuming Huang
Modulation of surface oxygen vacancies (O v ) by defect engineering is an attractive strategy for designing high performance transition metal oxide nanozymes. In this work, we reported the fabrication of the CoMoO 4 oxidase-like nanozyme, i.e. CoMo-300r, by first pyrolyzing the CoMo layered double hydroxide precursor in an air atmosphere at 300 °C and subsequent NaBH 4 reduction strategy. Various characterization outcomes confirm the mesoporous structures of both CoMo-300r and no NaBH 4 treated CoMo-300, while the specific surface area of CoMo-300 is significantly increased from 103.54 m 2 ·g −1 to 165.24 m 2 ·g −1 after NaBH 4 reduction. Also, NaBH 4 reduction treatment leads to the formation of O v rich CoMoO 4 and reduced metal ion species on the surface, promoting the redox reaction kinetics. The CoMo-300r prepared at a molar ratio of Co to Mo of 1:2, pyrolysis temperature of 300 °C and 10 mM NaBH 4 exhibited the best oxidase-like activity. The oxidase-like activity of CoMo-300r is 2.6-fold times that of no NaBH 4 treated optimal CoMo-300. The CoMo-300r can effectively promote TMB oxidation to produce blue color and has the Michaelis-Menten constant of 0.0428 mM, which was lower than most cobalt-based oxide nanozymes and indicated a higher affinity for TMB. In terms of inhibition of SO 3 2− on the CoMo-300r/TMB system, a sensitive SO 3 2− colorimetric sensing platform was established. The linear range and limit of detection for sulfite determination were 0.2–40 μM and 0.09 μM, respectively. The relative standard deviation for the determination of 10 μM sulfite was 1.41% ( n = 11). The method was successfully applied to the detection of sulfite in white wine. This work provides a new strategy to fabricate high activity oxidase mimetic for food analysis.
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Tingzhan Wang,Jingkun Chen,Jiaxuan Chen,Xuan Yao,Gang Chen,Zheng Jiao,Jing-Tai Zhao,Shuai Cheng,Xue-Chun Yang,Qianli Li
N-butanol gas is a common volatile organic compound (VOC) that can pose a threat to human health and pollute the atmospheric environment. However, the n-butanol gas sensors suffer from low response and selectivity. Herein, we synthesized the Ga-doped ZnO (ZOG) sensors by one-step hydrothermal treatment and subsequent calcination. The oxygen vacancies content of 1-ZOG has increased by 46 % compared to pure ZnO. Rich oxygen vacancies can increase the response signal of 1-ZOG to 174.78 in darkness for 100 ppm n-butanol, which is 2.4 times that of ZnO. Furthermore, the gas sensing performance of 1-ZOG is improved by light excitation. Under UV irradiation, the response of 1-ZOG sensor to 100 ppm n-butanol is 3.6 times that of pure ZnO, up to 636.81. Meanwhile, the response signal of 1-ZOG to n-butanol is at least 6.32 times that of other gases under UV light, showing ultra-high selectivity. This study proved that both Ga doped and photo-excited are effective strategies for improving the sensitivity and selectivity of ZnO based gas sensors.
研究领域:
材料科学
·
环境科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Xiaoxia Chen,Meihuan Liu,Chudi Ni,Yiwen Chen,Tianwen Liu,Shiyu Li,Hui Su
Ruthenium (Ru)-based catalysts have emerged as promising alternatives to Iridium (Ir) catalysts in proton exchange membrane water electrolysis cells due to their lower price and excellent oxygen evolution reaction (OER) activity. However, their stability is compromised by generation of unstable high-valence Ru sites and oxygen vacancy in a lattice oxygen-mediated (LOM) pathway. Here, a low-load Ru site on a Barium (Ba)-doped Co 3 O 4 (RuBa x Co 3–x O 4 ) catalyst is developed with abundant Ruthenium─Cobalt (Ru─Co) pairs for enhanced acidic OER activity. The incorporation of Ba can efficiently modulate the lattice of Co 3 O 4 , creating Ru─Co active pairs with optimized spacing through compression stress. In situ characterizations exhibit contractive Ru─Co pairs that promote the rapid and direct coupling of * O─O * radicals, bypassing the sluggish * OOH species and avoiding the oxygen vacancies, which can trigger the oxide path mechanism (OPM) for an efficient and stable OER process. As a result, the designed catalyst delivers a low overpotential of 219 mV to achieve a current density of 10 mA cm −2 , and also demonstrates excellent stability, maintaining performance over 50 h of continuous operation at a larger current density of 50 mA cm −2 . These findings highlight the potential of the RuBa x Co 3-x O 4 catalysts for durable and efficient OER applications.
研究领域:
材料科学
·
催化化学
✓ 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）