CERAMICS INTERNATIONAL
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2018
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IF 3.057
Xinxin Xing,Yue Yang,Zhiyong Yan,Ying Hu,Tong Zou,Zidong Wang,Yude Wang
In this work, CdO-Ag-ZnO nanocomposites with hierarchically porous structure and large surface area were successfully fabricated by solution combustion synthesis (SCS) method. Crystalline structure, morphology, surface chemical states and specific surface area were investigated by XRD , SEM, TEM, XPS and BET techniques, respectively. Sensors fabricated from CdO-Ag-ZnO nanocomposites were made based on indirect heating method, which showed superior sensing properties in detecting different concentration of volatile organic compounds (VOCs). In contrast with singular ZnO, gas-sensing experiment results reveal that the addition of CdO and Ag effectively decreases optimum working temperature, increases gas response value and shortens response and recovery time. What’s more, other gas-sensing properties including repeatability, sensitivity and long-term stability are also discussed in this research. Particularly, gas sensor based on 10 mol% CdO-Ag-ZnO shows modest gas-sensing performance to VOCs at the operating temperature of 200 °C, and its gas response values are 198.63, 156.07, 53.04, 64.23, 183.65 towards 100 ppm formaldehyde, ethanol, acetone, methanol and isopropanol, respectively, indicating it a promising candidate in detecting VOCs. Superior sensing property is mainly ascribed to large specific surface area, special porous surface morphology, unique combination of nanocomposites and good catalytic ability of metallic Ag.
研究领域:
材料科学
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纳米技术
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气体传感
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环境监测
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Xin Liu,Tiehu Li,Yuhui Liu,Yiting Sun,Yanying Han,Tung Chun Lee,Amir Zada,Zeqi Yuan,Fei Ye,Jiahe Chen,Alei Dang
Sensitive and rapid identification of volatile organic compounds (VOCs) at ppm level with complex composition is vital in various fields ranging from respiratory diagnosis to environmental safety. Herein, we demonstrate a SERS gas sensor with size-selective and multiplexed identification capabilities for VOCs by executing the pre-enrichment strategy. In particular, the macro-mesoporous structure of graphene aerogel and micropores of metal-organic frameworks (MOFs) significantly improved the enrichment capacity (1.68 mmol/g for toluene) of various VOCs near the plasmonic hotspots. On the other hand, molecular MOFs-based filters with different pore sizes could be realized by adjusting the ligands to exclude undesired interfering molecules in various detection environments. Combining these merits, graphene/AuNPs@ZIF-8 aerogel gas sensor exhibited outstanding label-free sensitivity (up to 0.1 ppm toluene) and high stability (RSD=14.8%, after 45 days storage at room temperature for 10 cycles) and allowed simultaneous identification of multiple VOCs in a single SERS measurement with high accuracy (error < 7.2%). We visualize that this work will tackle the dilemma between sensitivity and detection efficiency of gas sensors and will inspire the design of next-generation SERS technology for selective and multiplexed detection of VOCs.
研究领域:
材料科学
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分析化学
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环境科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Inorganics
·
2022
·Vol. 10
·期 3
·29
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IF 3.149
Van Thi Thanh Ho,Dung Hung Chau,Khang Quang Bui,Ngan Thi Thanh Nguyen,Thi Kim Ngan Tran,Long Giang Bach,Son Nguyen Truong
TiO2-based photocatalysts still have some limitations such as large bandgap and low surface area, leading to low efficiency in the photocatalytic degradation of VOCs and limiting it to use in sunlight. Here we report that the nanostructured Ir-doped TiO2as an efficient photocatalyst generates an excellent risk-reduction material of gaseous toluene. We have succeeded in developing a nanostructured Ir-dopedTiO2and initially found that excellent efficient photocatalytic VOC decomposition can be achieved in our materials The nanostructured Ir-dopedTiO2was synthesized by a one pot, low temperature hydrothermal process with different ratios of Ir doped into theTiO2. It exhibited a high surface area, uniformly spherical morphology of 10–15 nm. Its activity for the photocatalytic degradation of gaseous toluene exhibited up to 97.5% under UV light. This enhancement could be explained by iridium doping which created a high concentration oxygen vacancy and changed the recombination rate of the photogenerated charge carriers. More generally, our study indicates a strategic way to develop the novel nanostructured material for numerous applications.Keywords:photocatalysts;Ir-doped TiO2;VOCs;toluene
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yuan Zhuang,Siyi Yuan,Jiemin Liu,Yan Zhang,Hao Du,Chuandong Wu,Peng Zhao,Haiying Chen,Yipu Pei
Volatile organic compound (VOC) emissions are a global environmental concern because of their potential health risks. The removal of refractory VOCs calls for advanced technologies with powerful oxidative ability and high mass transfer efficiency. In this study, a yolk-shell Fe 3 O 4 @C/Fenton system was designed to improve octane removal efficiency. The octane removal efficiency at equilibrium was increased by 24.7% relative to that of the Fe 3 O 4 /Fenton system, and the main intermediate or byproduct levels decreased by 89.4%. The yolk-shell Fe 3 O 4 @C displayed higher catalytic and mass transfer efficiencies for octane degradation than Fe 3 O 4 . A synergistic effect of mass transfer enhancement and catalytic oxidation was observed in the yolk-shell Fe 3 O 4 @C/Fenton system. The mechanism of the synergistic effect of mass transfer and octane degradation, a regional reaction theory for the yolk-shell structure, and octane removal pathways were proposed and supported by the octane removal results and byproducts detection and measurement. This yolk-shell Fe 3 O 4 @C/Fenton system provides an effective and advanced way to treat refractory and hydrophobic VOCs, and its preparation can be extended to other high-efficiency core-shell structure catalyst-carbon materials.
研究领域:
环境科学
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化学工程
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材料科学
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催化
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污染控制
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Hongli Fang,Wenjing Zeng,Yuya Wang,Jinlong Shen,Zebao Rui
Integrated heterojunction photocatalyst design concept is proposed. • Integrated heterojunction Bi/Bi2-xWO6-y is designed by in situ surface segregation. • Efficient photoinduced charges interfacial transfer and separation is obtained. • Hierarchical use of full spectrum light is boosted. • Prominent photothermocatalytic VOCs degradation performance is recorded. Development of robust photocatalysts for effectively treating complex environmental pollutants via utilizing full spectrum sunlight has been a highly desirable yet challenging project. Although the design of multicomponent or multiphase heterojunctions holds the potential, it still suffers from the unsatisfied charges migration and separation caused by interfacial incompatibility among heterojunction components. Herein, the integrated heterojunction photocatalyst design concept is proposed to conquer such challenge, in which the components of the heterojunction are tightly connected by “pseudo-single-phase” interfaces to realize efficient interfacial charge transfer. As an example, the defective bismuth tungstate nanosheets (Bi 2-x WO 6-y ) loaded with small-sized homologous Bi metal nanoparticles were synthesized via an in situ surface segregation method, namely Schottky integrated heterojunction H-Bi/VBWO. H-Bi/VBWO not only exhibits strong electronic interactions, which reduce the directional migration barrier of photogenerated charges, but also achieves hierarchical utilization of full spectrum light, resulting in the boosted production of energetic photoinduced charges by enhanced UV–vis absorption (via Bi/O vacancies & plasmonic Bi NPs) and robust photothermal effect caused by NIR absorption (via plasmonic Bi NPs & W 5+ ). The H-Bi/VBWO demonstrates robust photothermal catalytic VOCs degradation under simulated standard sunlight (AM1.5, 100 mW/cm 2 ) without external heat, ranging among the best of state-of-the-art photocatalysts and photothermocatalysts. Such an integrated heterojunction design concept provides a promising way for the design of robust photocatalysts for environmental application. Download: Download high-res image (163KB) Download: Download full-size image
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Kang Wu,Juxia Xiong,Yuhai Sun,Junliang Wu,Mingli Fu,Daiqi Ye
Boosting plasma-catalyst synergy to enhance volatile organic compounds (VOCs) decomposition remains a challenge. Herein, rich oxygen vacancies (V O ) were engineered into the SrTiO 3 catalysts through a facile nitrogen incorporation strategy for the plasma-catalytic decomposition of toluene and ethyl acetate. 100% toluene conversion with 81% CO 2 selectivity at a competitive energy efficiency was achieved under ambient conditions. The characterization results and theoretical calculations evidenced that the partial substitution of oxygen by nitrogen triggered the electronic reconstruction and local disorder, thus modulating the electronic properties and coordination structures contributed to the formation of V O -Ti 3+ pairs. Quasi in-situ EPR, operando OES , and operando DRIFTS originally demonstrated that the V O -Ti 3+ pairs as active sites promoted the plasma-catalytic synergy instead of isolated V O . Importantly, the V O -Ti 3+ pairs with favorable electron transfer characteristics energetically preferred to capture and utilize vibrationally excited oxygen species. And the lattice oxygen supplied by the V O -Ti 3+ pairs were more vigorously activated by the plasma to participate in the surface/interface reaction. This work advances our understanding of the real active sites in plasma-catalytic interfacial synergy and thus paving the way for the rational design of efficiently heterogeneous catalysts.
研究领域:
材料科学
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环境科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
Catalysts
·
2020
·Vol. 10
·期 4
·389
·
IF 3.52
Junping Ding,Huanchun Wang,Yidong Luo,Yushuai Xu,Jinsheng Liu,Yuanhua Lin
Layer-structured Bi2O2CO3is a novel photocatalyst for eliminating environmental pollutants. In this work, Bi2O2CO3nanosheets were synthesized by hydrothermal methods, followed by annealing in nitrogen. (002) oriented Bi2O2CO3nanosheets were obtained and characterized by XRD, SEM, XPS, BET and UV-Vis diffuse reflectance spectra. Photocatalytic properties were investigated by toluene removal in air, with the assistant of Bi2O2CO3nanosheets under artificial irradiation. Our results show that Bi2O2CO3annealed in nitrogen exhibited high full-light-driven photocatalytic activity for toluene photocatalytic decomposition, which may be ascribed to facet orientation evolution during the annealing process and enhanced efficient charge separation. The sample annealed at 150 °C for 8 h (BOC-150-8 h) showed high stability and the highest toluene removal rate, which was up to 99%. The final degradation products were detected by gas chromatography–mass spectrometer (GC-MS) and CO2was verified to be the primary product. Photocatalytic mineralization of toluene in air over Bi2O2CO3was proposed. This work may provide a foundation for application of annealed Bi2O2CO3in indoor air purification.Keywords:Bi2O2CO3;toluene decomposition;crystal orientation;volatile organic compound (VOCs);photocatalysis
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhiru Suo,Yuan Zhuang,Yanjun Zhao,Peng Zhou,Fushun Li,Binbin Huang,Chen Qu,Wenhui Li,Chuandong Wu,Jiemin Liu
Advanced oxidation processes (AOPs, such as Fenton) coupled with wet scrubbers are powerful and eco–friendly for VOCs treatment. However, challenges remain in the efficient removal of hydrophobic VOCs due to the extremely high gas-liquid mass transfer resistance. Herein, we constructed a “gas-solid-liquid triple-phase interface” in a Fenton wet scrubber via fabricating a new amphiphilic catalyst (PAN@Fe 3 O 4 @Nafion), which allows to capture gas bubbles and directly convey the VOCs to catalytic active center through gas transport and bypass the gas-liquid mass transfer (rate–determining) step. Compared with system with the unmodulated catalyst, the removal efficiency of hydrophobic styrene in the triple-phase interface Fenton wet scrubber was improved by 69.0%, the intermediates were dominated by small–molecule fatty acids (98.0%), and the outlet CO 2 concentration and H 2 O 2 consumption increased by 22.1% and 19.6%, respectively. Notably, mechanism analysis via confocal laser scanning microscopy and contact angle measurements revealed the arrangement of hydrophilic and hydrophobic regions on the catalyst surface. Moreover, the affinity ability of bubbles was 2.5 times greater and the mass transfer enhancement factor reached 2.2 in the triple-phase interface Fenton wet scrubber system. This study provides a new avenue for overcoming the gas-liquid mass transfer resistance of hydrophobic VOCs in AOP wet scrubbers.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF PROTEOME RESEARCH
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2024
·
IF 3.8
Jijuan Zhou,Dianlong Ge,Yajing Chu,Yue Liu,Yan Lu,Yannan Chu
Detection of exhaled volatile organic compounds (VOCs) is promising for noninvasive screening of esophageal cancer (EC). Cellular VOC analysis can be used to investigate potential biomarkers. Considering the crucial role of methionine (Met) during cancer development, exploring associated abnormal metabolic phenotypes becomes imperative. In this work, we employed headspace solid-phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS) to investigate the volatile metabolic profiles of EC cells (KYSE150) and normal esophageal epithelial cells (HEECs) under a Met regulation strategy. Using untargeted approaches, we analyzed the metabolic VOCs of the two cell types and explored the differential VOCs between them. Subsequently, we utilized targeted approaches to analyze the differential VOCs in both cell types under gradient Met culture conditions. The results revealed that there were five/six differential VOCs between cells under Met-containing/Met-free culture conditions. And the difference in levels of two characteristic VOCs (1-butanol and ethyl 2-methylbutyrate) between the two cell types intensified with the increase of the Met concentration. Notably, this is the first report on VOC analysis of EC cells and the first to consider the effect of Met on volatile metabolic profiles. The present work indicates that EC cells can be distinguished through VOCs induced by Met regulation, which holds promise for providing novel insights into diagnostic strategies.
研究领域:
肿瘤学
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代谢组学
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医学检测
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Ning Lu,Shurui Fan,Yaxu Zhao,Boxuan Yang,Zhongqiu Hua,Yi Wu
In this work, a selective methane gas sensor was prepared based on In 2 O 3 to eliminate the serious cross-sensitive sensitivity to VOCs, NO 2 , and CO, which are typical interfering gases for methane detection in domestic. The catalytic films of Pt-TiO 2 , Pt-CeO 2 , and Pt-ZrO 2 were placed on the top of the sensing layer, i.e., In 2 O 3 loaded with Pd. Catalytic films were designed as filters to catalytically oxidize the interfering gases, such as VOCs, to prevent them reaching the surface of the sensitive layers. Thanks to this design, our sensors showed a high selectivity to methane, even in the presence of ethanol, CO, and NO 2 . In addition, we confirmed via the power-law response of oxygen that the basic sensing mechanism between Pd-In 2 O 3 and the sensor-printed catalytic films are kept the same. Both follow the general model with MOS sensors, which involves an electron transfer process resulting from the adsorption of oxygen on the surface and interaction with methane molecules. The present study showed that catalytic filter films (Pt-TiO 2 , Pt-CeO 2 , and Pt-ZrO 2 ) printed on Pd-In 2 O 3 sensors could enhance the selective response to methane for methane monitoring.
研究领域:
材料科学
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化学传感器
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气体传感技术
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Haoxi Jiang,Zhonghua Liu,Chuanxu Yao,Sheng Wang
The emission of volatile organic compounds (VOCs) causes serious atmospheric environmental problems and catalytic combustion is one of the most promising methods in the treatment of VOCs. In this work, the Pt/Hβ catalyst was fabricated via supercritical fluid deposition (SFD) for the first time and its activity was evaluated for toluene catalytic combustion. The preparation conditions during the SFD process were optimized. Na 2 PtCl 6 was selected as the precursor and 450 °C as the reduction temperature. The catalysts prepared by the SFD and impregnation (IM) were compared. The Pt/Hβ catalyst prepared by SFD had smaller size and higher dispersion and its T90 was 25 °C lower than that prepared by IM, which showed obvious size effect. For the similar activity, the Pt loading on catalyst prepared by SFD is only 50% of that on catalyst prepared by IM, showing obvious reduction effect for noble metal.
研究领域:
环境科学
·
催化化学
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产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2024
·
IF 2.8
Yutong Liu,Yong Qiu,Qi Zhu,Tao Tian
Adsorption technology utilizing zeolites as adsorbents is a highly efficient and cost-effective method for controlling the emission of volatile organic compounds (VOCs). Herein, two hierarchical diatomite/FAU-type zeolite composites were synthesized by a seeding-assisted secondary hydrothermal growth method and high-temperature hydrothermal dealumination, respectively. The adsorption properties of the composites for VOCs, such as toluene, ethyl acetate, n-heptane, methanol and acetone, were systematically evaluated. The pseudo-second-order model provided a perfect fit to adsorption kinetics, while the Langmuir model agreed the best with the adsorption isotherms. Furthermore, Dt/USY has remarkable recycling stability even after five regeneration cycles, resulting in outstanding VOCs adsorption efficacy.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）