CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiaoshun Wei,Xuechun Yang,Yun Guo,Guohao Li,Yinzhong Liu,Lingli Cheng,Zheng Jiao
Being one of toxic and flammable volatile organic compounds (VOC), n-butanol has brought about many potential health risks, there is an urgent demand for highly sensitive detection techniques to monitor its concentration in occupational environments and the air. In this paper, Ce-doped MOF:ZnO sensors under UV activation for room-temperature detection of n-butanol were synthesized by the co-precipitation method and systemically characterized by XRD, SEM, HRTEM, and XPS. The sensitive performances were evaluated by the use of a WS-30A gas sensor measurement system. The results showed that Ce doping has significantly enhanced the sensitivity of the MOF:ZnO sensors, and the response value of the 0.08 % Ce-doped ZnO sensor has achieved to 397.30, which was 9.32 times higher than that of the pristine MOF:ZnO. And the response and recovery times were 17 and 117 s respectively, demonstrating a speedy detection capability. In addition, the sensor gained excellent stability and reproducibility with special selectivity for n-butanol. The comprehensive achievements of this research would be promising to promote the development of volatile organic compound detection technology and beneficial to the well application in the fields of environmental monitoring, industrial safety, and public health.
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高影响因子
Journal of the American Chemical Society
·
2024
·
IF 14.4
Baoxin Ni,Peng Shen,Guiru Zhang,Jiajun Zhao,Honghe Ding,Yifan Ye,Zhouying Yue,Hui Yang,Hao Wei,Kun Jiang
Pt is a well-known benchmark catalyst in the acidic oxygen reduction reaction (ORR) that drives electrochemical O2-to-H2O conversion with maximum chemical energy-to-electricity efficiency. Once dispersing bulk Pt into isolated single atoms, however, the preferential ORR pathway remains a long-standing controversy due to their complex local coordination environment and diverse site density over substrates. Herein, using a set of carbon nanotube supported Pt–N–C single-atom catalysts, we demonstrate how the neighboring N dopants regulate the electronic structure of the Pt central atom and thus steer the ORR selectivity; that is, the O2-to-H2O2 conversion selectivity can be tailored from 10% to 85% at 0.3 V versus reversible hydrogen electrode. Moreover, via a comprehensive X-ray-radiated spectroscopy and shell-isolated nanoparticle-enhanced Raman spectroscopy analysis coupled with theoretical modeling, we reveal that a dominant pyridinic- and pyrrolic-N coordination within the first shell of Pt–N–C motifs favors the 4e– ORR, whereas the introduction of a second-shell graphitic-N dopant weakens *OOH binding on neighboring Pt sites and gives rise to a dominant 2e– ORR. These findings underscore the importance of the chemical environment effect for steering the electrochemical performance of single-atom catalysts.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Qi Zhao,Zihan Liu,Ziyue Xu,Bowen Li,Siqi Yang
The real-time and effective detection of n-butanol gas is particularly important in production and daily life due to its flammability, toxicity, and potential hazards to the environment. This article reports the preparation of hollow indium oxide spheres and rGO/In 2 O 3 composites through a simple hydrothermal and subsequent heat treatment method. Test results indicate that the gas sensitivity of n-butanol can be significantly improved through rGO composites. The prepared hollow indium oxide spheres are composed of nanosheets with a diameter of probably 500 nm. After combination by rGO, the specific surface area and the proportion of adsorbed oxygen of the material are increased, both of which are advantageous for enhancing gas sensitivity abilities. At the optimum operating temperature of 160 °C, the response value of rGO/In 2 O 3 complex sensor is 51–50 ppm of n-butanol, which is 3.6 times the response of pure In 2 O 3 . Gas sensors composed of rGO/In 2 O 3 exhibit ultra-fast response time and low detection limit. Even for ppb grade (100 ppb) n-butanol gas, the response value is still 2.3. These characteristics make rGO/In 2 O 3 a promising material for the preparation of high-performance n-butanol gas sensors. Besides, the gas-sensitive mechanism of the enhanced n-butanol sensing performances is also analyzed.
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高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 14
·1188
·
IF 4.4
Hongyang Wu,Chen Chen
The efficient detection of n-butanol, which is in demand for highly sensitive materials, is essential for multiple applications. A nonaqueous method was applied to prepare NiFe2O4nanoparticles (NPs) using benzyl alcohol as a solvent, which shows a size of 7.9 ± 1.6 nm and a large surface area of 82.23 m2/g. To further improve the sensing performance for n-butanol, Pd/PdO functionalization was sensitized with NiFe2O4NPs. Gas sensing results demonstrate that the Pd/PdO-NiFe2O4exhibits an enhanced response of 36.9 to 300 ppm n-butanol and a fast response and recovery time (18.2/17.6 s) at 260 °C. Furthermore, the Pd/PdO-NiFe2O4-based sensor possesses a good linear relationship between responses and the n-butanol concentration from 1 to 1000 ppm, and great selectivity against other volatile organic compounds (VOCs). The excellent sensing enhancement is attributed to the catalytic effects of Pd/PdO, the increase of oxygen vacancies, and the formation of heterojunction between PdO and NiFe2O4. Thus, this study offers an effective route for the synthesis of Pd/PdO-functionalized NiFe2O4NPs to achieve n-butanol detection with excellent sensing performance.
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PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2024
·
IF 5.5
Bo Wang,Zhenxing Wang,Yu Wan,Yimu Wang,Shuang Gao,Yan Chen,Qingsong Luo,Changhao Feng
Background Developing high-performance n -butanol gas sensors is of great significance for environmental protection and human health. The Bi-doped ZnFe 2 O 4 nanofibers exhibit promising potential as a viable option for n- butanol sensors. Methods In this study, a series of high response and fast response n -butanol gas sensors were successfully fabricated by Bi-doped ZnFe 2 O 4 nanofibers with different atomic percentages (0 %, 1 %, 3 %, 5 %), which were synthesized by a facile electrospinning method. Significant findings The nanofibers with a Bi/Zn molar ratio of 3 % showed a response value of 23.6 to 100 ppm n -butanol at 175 °C, which was 2.4 times higher than that of the pure ZnFe 2 O 4 nanofibers, and with a lower concentration detection limit (1.5 for 100 ppb n -butanol). In addition, the gas sensing materials had a good selectivity and long-term stability to n -butanol, and the mechanism of the good sensing performance of Bi doped ZnFe 2 O 4 nanofibers for n -butanol is also analyzed in this paper.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Xiao Xue,Hui Chen,Chongbo Zhang,Jiayu Li,Siwen Tao,Xinhua Tian,Ruiqin Gao,Meihong Fan,Ni Bai,Guo-Dong Li
n -butanol detection is crucial to environmental protection and mankind’s health because of its toxicity and irritation to the respiratory system. Mono-metal oxide semiconductors (such as SnO 2 ) often face disadvantages such as low sensitivity, insufficient selectivity, and a high detection limit. Constructing heterojunctions has been considered an efficient way to enhance the performance of MOS gas sensors. This work presents the synthesis of a series of β -CdSnO 3 -SnO 2 nanorod-like heterostructures with good n -butanol sensitivity using a hydrothermal and post-calcination approach. The optimized CSO/SO-8 shows the highest response value about 90–100 ppm n -butanol at 190 °C, which is 15 times greater than that of SnO 2 , and 6.5 times more than that of β -CdSnO 3 . Meanwhile, the CSO/SO-8 also exhibits a short response and recovery time (1–2 s/63 s). More importantly, the detection limit is reduced to ppb level (50 ppb). The improved gas-sensitive properties can be explained by the formation of n - n heterojunctions between β -CdSnO 3 and SnO 2 , which increases the content of chemisorbed oxygen, thus enhancing the performance of the gas-sensitive. Our work not only provides a material with n - n heterostructures but also the strategy for constructing heterojunctions to improve gas-sensitive properties.
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高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 36
·e04484
·
IF 2
Xiaoqian He,Peicheng Jiang,Qilin Wang,Xinyi Luo,Shu Chen
Organic water pollution poses a global challenge. The unique properties of transition metal carbides (MXenes) make them ideal candidate adsorbents for removing water contaminants. However, limitations in the types and quantities of surface functional groups on MXenes, coupled with their inherent instability, have restricted their application in adsorbing organic dyes such as methyl blue. This study prepared sulfur–nitrogen co-doped MXenes (S─N─MX) through thermal annealing co-doping of MXenes with thiourea. This method successfully introduced sulfur and nitrogen elements as functional groups into the MXene structure, increasing the variety and quantity of surface functional groups and significantly enhancing the number of active sites. This process effectively suppresses nanolayer stacking, enhances structural stability, and substantially increases the material's adsorption capacity. Langmuir adsorption isotherm measurements reveal a maximum adsorption capacity of 239.8 mg·g −1 at 298 K and pH = 9. The material achieves efficient adsorption of methylene blue through electrostatic interactions, Lewis acid–base interactions, and hydrogen bonding. The incorporation of sulfur and nitrogen elements provides a protective effect, ensuring the composite adsorbent maintains excellent stability during adsorption–desorption cycles. After five adsorption-desorption cycles, its adsorption capacity retained over 85%. Graphical S–N co-doped MXene is synthesized via thermal annealing with thiourea, which introduces abundant surface functional groups and enhances active sites. This adsorbent exhibits a high methylene blue adsorption capacity of 239.8 mg·g - 1 through electrostatic attraction, Lewis acid–base interaction, and hydrogen bonding. It also demonstrates excellent recyclability, retaining over 85% efficiency after five cycles.
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高影响因子
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
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2022
·Vol. 2022
·期 47
·e202201229
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IF 3.261
Xiaokang Kang,Helin Wang,Qingle Zeng
Graphical An odorless and efficient synthesis of N -sulfenyl sulfoximines has been developed through the electrophilic sulfurization of thiosulfonates with sulfoximines. The reaction was carried out under mild conditions without transition metal catalysis, heating, and the use of toxic reagents. N -Sulfenylation of sulfoximines with thiosulfonates under mild conditions was disclosed. By our method, a series of aliphatic and aromatic N -sulfenyl sulfoximines were synthesized with good to excellent yields in the absence of transition metals. The applicability of this method was demonstrated by gram scale experiments.
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高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Hantao Su,Xiaoxian Kuang,Yuan Ren,Lixin Luo
Adding biostimulants is an effective means to improve the degradation efficiency of refractory organics such as petroleum hydrocarbons , and the mechanisms of biostimulants varies from their types. In this study, n-hexadecane was used as the target pollutant to explore the effects of different kinds of biostimulants on the degradation ability of Raoultella planticola . The results showed that sodium gluconate had the most remarkable enhanced effect with an increase of 241.7% within 10 days. Moreover, R. planticola was stimulated by sodium gluconate to secrete biosurfactants and it was confirmed as a non-ionic lipopeptide by structural characterization. Most biosurfactants existed in intracellular and the emulsion index E 180 was 58.33%. The addition of the extracted biosurfactants as a biostimulant was validated and found to increase the degradation rate by 341.2% within 6 days. RNA sequencing (RNA-seq) and real-time quantitative PCR (RT-qPCR) were used to reveal the molecular basis of biosurfactants secretion and the results showed the up-regulation of genes for fatty acid and lipopeptide synthesis with the addition of sodium gluconate. In conclusion, this paper demonstrates that sodium citrate, seignette salt, sodium succinate, and sodium gluconate all had a good enhanced effect on R. planticola , and first reported that the promoting effect of sodium gluconate was mainly accomplished by stimulating R. planticola to produce biosurfactants. Direct use of inexpensive biostimulants to stimulate indigenous microorganisms to improve their degradation ability provides an economical idea for the remediation of petroleum hydrocarbon pollution, which will have great application prospects.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Sen Liao,Fawei Zhu,Xinyi Zhao,Hua Yang,Xiaoqing Chen
In this work, phosphorus, nitrogen co-doped carbon quantum dots (P,N-CQDs) as highly selective fluorescent probe for cobalt ion (Co 2+ ) detection were designed and synthesized via a one-step hydrothermal protocol by employing pyridoxal 5-phosphate and ethanediamine. This probe enables selective detection of Co 2+ with a linear range of 0–60 μM and a limit of detection of 0.053 μM through variation in fluorescence with respect to target concentration and electron-transfer from P,N-CQDs to Co 2+ . Furthermore, ethylenediaminetetraacetic acid-modified Fe 3 O 4 @SiO 2 (Fe 3 O 4 @SiO 2 -EDTA) was tailor-designed and prepared to successfully realize the recovery of P,N-CQDs/Co 2+ fluorescence for the first time. The reusable P,N-CQDs as fluorescent sensors for Co 2+ also show good linearity and sensitivity. Ultimately, this fluorescent probe was applied in the analysis of real river water samples.
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Chi Chen,Zhuye Li,Baoming Xu
The C&N coated Li 2 ZnTi 3 O 8 is synthesized by heat-treating pristine Li 2 ZnTi 3 O 8 and urea (CO(NH 2 ) 2 ) at 400 °C for a short time. The content of the C&N layer of the C&N coated Li 2 ZnTi 3 O 8 is ~3.5 wt% and the N content of 2.06 wt% is achieved. After coupling with a C&N layer, the C&N coated Li 2 ZnTi 3 O 8 delivers a discharge specific capacity of 230.1, 211.9, 197.4, 190.6 and 180.4 mAh g −1 after 10 cycles at the current density of 0.1, 0.5, 1.5, 2.5 and 4.0 A g −1 , respectively, and exhibits a remarkable stability over 400 cycles at 1.5 A g −1 . The effect of the formed C&N layer on the structure and electrochemical properties of the C&N coated Li 2 ZnTi 3 O 8 has been characterized by a series of means.
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Ping Qiu,Yongyong Lai,Xulu Sun,Changfeng Chen,Lei Ge
Various approaches have been developed to enhance n-type Cu 2 O photoelectrochemical activity. This study introduced a simple method of tuning electronic structure through adjusting solution pH when electrodeposition of Cu 2 O films on FTO substrate. Combined surface analysis showed that the Cu 2 O films presented gradual change cruciate flower-like nanostructure and hybrided with metallic copper. The Cu/Cu 2 O films presented a visible light response and the band gap could be effectively decreased by increasing the deposition solution pH. The photoelectrochemical cathodic protection performance of the films was studied. The electrode potential of 304 stainless steel by coupling with the Cu/Cu 2 O films (deposited at pH 5) reached the most negative photopotential shift of 179 mV under illumination. The related photocurrent density was 0.12 mA/cm 2 . This enhanced photoelectrochemical performance was evidenced by both direct excitation of Cu 2 O and the surface plasmon resonance effects of Cu upon illumination.
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高影响因子
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