JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jian Ding,Mingyi Xie,Zhen Li,Yang Wang
Given the persistent and detrimental impact of atmospheric ozone (O 3 ) on human health, achieving high-sensitivity detection of ozone at low temperatures is crucial for mitigating its harmful effects. Here, by hydrothermal synthesis and annealing, hexagonal and orthogonal WO₃ (h/o-WO 3 ) homojunction nanosheets were prepared and used as high-performance O 3 sensors. The results showed that the optimal operating temperature of the h/o-WO 3 sensor is 120 °C, the response value to 3.0 ppm ozone is 320.8, and the detection limit is 40 ppb. The mechanism shows that the homojunction structure increases the depletion layer thickness and carrier separation, which facilitates ozone decomposition and significantly enhances the ozone sensing performance. This study provides a novel approach for the preparation of high sensitive low temperature ozone sensing materials.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Liang Yin,Jinfeng Luan,Li Lv,Bin Liu,Wenbin Ren,Xiangqun Chu,Jia Wang,Zheng Lu,Pinhua Zhang,Lulu Du,Guangliang Cui
The detection of hydrogen sulfide (H2S) in exhaled breath at room temperature is essential for health monitoring and disease diagnosis. This study investigates a ZnO/Ti3C2TX nanocomposite synthesized by combining ZnO nanoparticles, prepared by a hydrothermal method, with Ti3C2TX MXene. Experimental results demonstrate that the ZnO/Ti3C2TX nanocomposite sensors exhibit excellent H2S detection performance at room temperature with high sensitivity, rapid response time, and robust recovery capability. Specifically, the ZnO/Ti3C2TX-1.0 wt % nanocomposite sensor shows a response of 85.116 at 5 ppm of H2S, which is 14-fold and 35-fold greater than that of pure ZnO and Ti3C2TX MXene, respectively. The sensor exhibits a rapid response (50 s) and recovery time (115 s) at 100 ppb of H2S. Additionally, it shows exceptional sensitivity to H2S at low concentrations, with a detection limit as low as 1 ppb. Based on the excellent sensing performance, oral exhaled gas detection demonstrates that the sensor effectively differentiates H2S levels in healthy and patient breath samples. These findings highlight the potential of the ZnO/Ti3C2TX nanocomposite in exhaled H2S detection at room temperature, offering new insights for developing ultrasensitive biogas sensors.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Wenbo Li,Shaojie Ma,Yuchen Zhu,Bin Zhao,Fei Feng
This paper reports a micro gas chromatographic column (μGCC) with in-situ growing macro-porous silicon as the stationary phase support layer. The macro-porous silicon stationary phase support layer (MPSL) with uniform thickness was fabricated in-situ on the inner surface of the μGCC channels by metal-assisted chemical etching. In order to avoid the negative effect of uneven thickness of the stationary phase, a 10 nm alumina film was deposited as the stationary phase on the MPSL using the atomic layer deposition technique. The macro-porous structure and high specific surface area of the MPSL provide longer diffusion paths and larger mass transfer interfaces for the analytes, which reduces the longitudinal gas diffusion and mass transfer resistance, thus improving the column efficiency. The μGCC with the MPSL achieved a 1306.7% increase in the theoretical plate number and a 195.0 % improvement in the resolution for n-nonane compared with the μGCC without the MPSL.
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yan-nan Wang,Jin Li,Zhenyu Yuan,Fanli Meng
An optical fiber triethylamine (TEA) gas sensor based on a hollow malposition structure (HMS) platform with CQDs@BiOBr gas-sensing layer is proposed. The CQDs@BiOBr gas-sensing material is coated onto the surface of the hollow core fiber (HCF) using a dip-coating method. The misaligned structure is designed to guide light transmission within the cladding of the HCF and excite the evanescent field. The heterojunction formed between CQDs and BiOBr enhances the separation efficiency of electron-hole pairs, improving the transfer speed of charge carriers during the gas adsorption process. Experimental results show that the sensitivity of sensor at room temperature is 3.53 pm/ppm, which is 2.43 times higher compared to a sensor coated with BiOBr alone. Additionally, the response and recovery times of sensor are 12 s and 36 s, respectively, with a limit of detection (LOD) of 5.67 ppm. DFT calculations provide insight into the electronic transfer pathways and electron cloud distribution during the gas adsorption process, further validating the crucial role of the CQDs@BiOBr heterojunction in enhancing gas-sensing performance. The proposed optical fiber TEA gas sensor shows significant potential for applications in environmental monitoring and industrial safety.
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ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Zhijian Li,Changhui Zhu,Haiyong Wang,Yuan Liang,Haosheng Xin,Song Li,Xiaohong Hu,Chenguang Wang,Qi Zhang,Qiying Liu,Longlong Ma
For the biomass catalytic valorization in the presence of a H2 atmosphere, large amounts of H2O and H2 are necessary to improve the processing efficiency, which resulted in the waste of such generous inputs. As a model reaction, the traditional hydrodeoxygenation of 5-hydroxymethylfurfural (5-HMF) selectively produces 2,5-dimethylfuran (2,5-DMF) under high pressure H2. Meanwhile, the water-gas shift reaction (WGSR) can counteract the harmful CO by simultaneously producing H2 from H2O. The hydrogenolysis of 5-HMF to 2,5-DMF produces H2O because of the hydroxyl group removal. Therefore, adding a trace amount of H2O to initiate 5-HMF hydrodeoxygenation coupled with WGSR to achieve H2O recycling in the reaction process is of great significance but extremely challenging. Herein, we reported a new process for the selective hydrodeoxygenation of 5-HMF to 2,5-DMF coupled with WGSR using a single catalyst, Au/ZrO2. A detailed study showed that the hydrogen species produced in situ by WGSR was used for 5-HMF hydrodeoxygenation to obtain 78.5% of 2,5-DMF yield. The H/H2O cycle in the coupling reactions exhibited a H2 utilization efficiency of 88.2%. Without using external H2, this work provided a new method for 5-HMF hydrodeoxygenation to 2,5-DMF triggered by WGSR and also showed the potential for application in H2O-saving conversion of cellulosic biomass with C–OH or C═O groups to value-added chemicals and fuels.
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高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 7
·3843-3851
·
IF 3.809
Hu Hui-Chao,Zhang Yu,Zeng Tong,Zhou Weining,Chen Lihui,Huang Liulian,Ni Yonghao
This paper reports a robust method for rapid determination of cellulose derived 5-hydroxymethyl-2-furfural (5-HMF) in biomass hydrolysate suspension based on headspace gas chromatography (HS-GC). The headspace equilibration at 150 °C for longer than 4 min with a pH range of 2.0–3.5 and a 50% (v/v) of ethanol content can obtain the full evaporation of 5-HMF, and eliminate the formation of additional 5-HMF generation from hexose. The linear GC response of 5-HMF was achieved by controlling the sample size within 20 μL. The results showed that this method has a good precision (relative standard deviation < 6.97%) and accuracy (recoveries ranged from 94.0 to 104.8%). The limit of quantification of the method was 51 mg/L. It was also found that a considerable amount of furfural (13.8%) and 5-HMF (18.7%) was adsorbed on condensed lignin and humins in residual biomass, and the washing procedure with ethanol can completely extract the adsorbed furfural and 5-HMF. The present method is accurate, simple, and robust, it will be a powerful tool for determining the content of 5-HMF in the liquid samples from biorefinery related processes.
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RSC Advances
·
2020
·Vol. 10
·期 60
·36287-36294
·
IF 3.119
Zhang Cong,Chen Xiang,Hu Yongpeng,Bai Yang,Guo Zhaoqi,Fan Daidi,Ma Haixia
Nitrogen-rich energetic materials (EMs) have been widely studied because of their high thermal stability, insensitivity, excellent detonation performance and non-toxic characteristics. In particular, these compounds are well applied as gas-generating agents (GGAs). As a nitrogen-rich heterocyclic framework, 1,2,4,5-tetrazine derivatives have shown great potential in the design of GGAs. The guanidine salts of 3,6-bis-nitroguanyl-1,2,4,5-tetrazine (DNGTz), guanidine (G2DNGTz) (1), aminoguanidine (AG2DNGTz) (2), diaminoguanidine (DAG2DNGTz) (3), and triaminoguanidine (TAG2DNGTz) (4) have been synthesized and characterized by elemental analysis and FT-IR. The crystal structures of 1 and 2 were obtained by X-ray single crystal diffraction. Crystal analysis shows that 1 and 2 arrange through zigzag-chain-like assembly and face-to-face geometries, which is helpful in decreasing mechanical sensitivity. The thermal stability and thermal decomposition kinetics of these four salts were studied by Differential Scanning Calorimetry (DSC). Furthermore, the thermogravimetry-Fourier transform infrared-mass spectrometry (TG-FTIR-MS) analysis of thermal decomposition products reveals that the main decomposition gaseous products are H2O, N2O, CO2, NO, N2 and NH3. Then, the cytotoxicity of the four salts was tested by MTT (3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide) method, and it was found that salts 1–4 show slight cytotoxicity in mouse fibroblasts (L929), at a concentration of 0.125 mg ml−1. The insensitivity, low toxicity, and production of clean gases without solid residue after burning of salt 1 indicate that it can be used as a potential green energetic material for GGAs.
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FUEL
·
2023
·
IF 7.4
Xin Huang,Zijun Ran,Zhi He,Jingyu Ran
Mercury has a significant impact on environment and is mainly derived from coal-fired power plant. Herein, we report a potential route for efficient removal of Hg 0 via oxidation reactions using Ce-doped LaCoO 3 supported on CeO 2 catalyst. Catalyst characterization results proved that Ce can successfully substitute a desired part of Co into the LaCoO 3 crystal lattice via a sol–gel method. The Hg 0 removal experiments suggest that Hg 0 removal efficiency decreased in the order of La 0.875 Ce 0.125 CoO 3 /CeO 2 > La 0.875 Ce 0.125 CoO 3 > LaCoO 3 . The presence of O 2 provided more active oxygen and resulted in approaching 100% Hg 0 removal efficiency. Introducing H 2 O and sole SO 2 would significantly reduce the Hg 0 removal efficiency as a result of competitive adsorption on the actives sites of the catalyst. On the other hand, SO 2 could reacted with Hg 0 in the presence of O 2 and thereby recover the high Hg 0 removal efficiency and the La 0.875 Ce 0.125 CoO 3 /CeO 2 catalyst presented a good performance towards sulfur resistance. Furthermore, the catalyst still exhibited a high Hg 0 removal efficiency performance after five times consecutive recycles.
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高影响因子
Frontiers of Materials Science
·
2021
·Vol. 15
·期 3
·406-415
·
IF 2.765
He Xia,Liu Qingchun,Zhou Ying,Chen Zhan,Zhu Chenlu,Jin Wanhui
Wearable gas sensors can improve early warning provision for workers in special worksites and can also be used as flexible electronic platforms. Here, the flexible multifunctional gas sensor was prepared by grafting graphene oxide (GO)-Ag onto cotton fabric after swelling. The maximum bacterial inhibition rate of GO-150/cotton fabric was 95.6% for E. coli and 87.6% for S. aureus , while retaining the original high moisture permeability of cotton fabric. So GO/cotton fabric can resist the multiplication of bacteria. At the same time, GO can greatly improve the UV protection performance of cotton fabric used in garments. With increase of the GO concentration, the UV protection ability of composite fabric is enhanced. Finally, GO-Ag/cotton fabric sensors had stable NH 3 gas-sensitive properties and good washing stability. In conclusion, these cotton fabric sensors with antibacterial properties, UV resistance and highly sensitive gas-sensitive properties have potential applications in wearable early warning devices and textile products.
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MOLECULES
·
2016
·Vol. 21
·期 11
·1466
·
IF 2.465
Shengming Xie,Junhui Zhang,Nan Fu,Bangjin Wang,Cong Hu,Liming Yuan
Molecular organic cage compounds have attracted considerable attention due to their potential applications in gas storage, catalysis, chemical sensing, molecular separations, etc. In this study, a homochiral pentyl cage compound was synthesized from a condensation reaction of (S,S)-1,2-pentyl-1,2-diaminoethane and 1,3,5-triformylbenzene. The imine-linked pentyl cage diluted with a polysiloxane (OV-1701) was explored as a novel stationary phase for high-resolution gas chromatographic separation of organic compounds. Some positional isomers were baseline separated on the pentyl cage-coated capillary column. In particular, various types of enantiomers including chiral alcohols, esters, ethers and epoxides can be resolved without derivatization on the pentyl cage-coated capillary column. The reproducibility of the pentyl cage-coated capillary column for separation was investigated using nitrochlorobenzene and styrene oxide as analytes. The results indicate that the column has good stability and separation reproducibility after being repeatedly used. This work demonstrates that molecular organic cage compounds could become a novel class of chiral separation media in the near future.Keywords:porous organic cage;capillary column;chiral stationary phase;chiral separation;gas chromatography
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yu Sun,Minghuo Wu,Tiezheng Tong,Peng Liu,Peng Tang,Zhiwei Gan,Ping Yang,Qiping He,Baicang Liu
Quantification of organic pollutants in flowback and produced water is essential to design appropriate treatment strategy and predict the potential environmental toxicity associated with unconventional energy production. Herein, we firstly characterized the important range chemicals of produced water (PW) collected from Weiyuan shale gas play, China. Ultra-high resolution (>10 M) electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry was used to gain insights into molecular compositions of mass range 170–1,000 Da. Oxygen-containing organic compounds (CHO) was the dominant type of compounds in the PW, and classes of O 8 and O 9 had the highest relative abundance. Highly unsaturated phenolic and aliphatic compounds were identified as the main compounds. Three low molecular weight (LMW, <170 Da) compounds, dimethylbenzylamine (DMBA), indoline, and 6-methyl-quinoline, were firstly revealed in the PW, with their concentrations of 137.11 μg/L, 5.48 μg/L, and 0.9 μg/L, respectively, as determined by liquid chromatography coupled to tandem mass spectrometry. An integrated process of ultrafiltration coupled with reverse osmosis was employed to treat the PW and achieved 78.3%, 96.3%, and 100% removal for these three chemicals. The concentration of DMBA in the effluent is 29.75 μg/L, which potentially cause environmental risks even after advanced membrane treatment, suggesting that LMW chemicals such as DMBA in PW deserves special attention.
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Small
·
2025
·Vol. 21
·期 41
·e08227
·
IF 12.1
Haoyu Deng,Tongtong Yu,Xinjian He,Shuang Li,Changhe Du,Pengfei Liu,Ruilin Shen,Yange Feng,Liqiang Zhang,Daoai Wang
Atomically thin films exhibiting ultra-low friction and ultra-strong wear resistance are crucial for overcoming lubrication challenges in micro-nano electromechanical systems (M/NEMS). However, achieving these properties under conventional pressure conditions remains a major challenge. In this study, a novel strategy is presented to further reduce friction and enhance wear resistance by tuning the atmosphere composition. High-quality monolayer (ML, ≈0.9 nm) and bilayer (BL) MoSe 2 single crystals are successfully synthesized via the chemical vapor deposition (CVD) method. Compared to BL MoSe 2 , ML MoSe 2 exhibits ultra-low coefficient of friction (COF = 0.0091) and super wear resistance (40 000 cycles@2.17 GPa) under atmospheric conditions. Additionally, the surface friction can be modulated by varying the oxygen-to-nitrogen ratio, and the best friction reduction and anti-wear properties are achieved in pure nitrogen. Notably, the COF of ML MoSe 2 can be further reduced by 50% (COF = 0.004), and the wear resistance increases nearly four times (208,640 cycles@2.26 GPa) in pure N 2 . Experimental and molecular dynamics analyses reveal that stronger adhesion of N 2 molecules to the surface, coupled with weaker intermolecular interactions, promotes ultra-low friction and super wear-resistance in ML MoSe 2 . The molecular mechanism proposed by this work provides a new degree of freedom for friction modulation and also introduces a promising strategy in constructing ultra-low friction and super wear-resistant systems with atomic-scale thickness.
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