BIOMASS & BIOENERGY
·
2025
·
IF 5.8
JiWen Fu,Hong Tian,ZiQi Tang,ZhangJun Huang,Lei Liu,Tan Gao,SiJin Chen,MingHao Lv
Since the extensive utilization of fossil fuels has led to a sharp increase in atmospheric CO 2 levels, controlling CO 2 emissions has garnered widespread attention. Carbon materials, as important CO 2 adsorbents, are often functionalized with heteroatoms such as N and B. However, the influence of B/N co-doping on CO 2 sorption remains unclear. In this study, a series of B/N co-doped lignin-derived carbons were synthesized via a one-pot pyrolysis using alkali lignin as the precursor and boric acid and glutamic acid as B and N dopants, respectively. The prepared samples were characterized using SEM, XPS, FTIR, and Raman spectroscopy. B/N co-doping enhanced the specific surface area, pore volume, and crystallinity of the carbon while introducing new surface functional groups such as BC 2 O and BCO 2 , without significantly altering the types or relative content of N-containing functional groups. The CO 2 adsorption capacity of B/N co-doped lignin-based carbon reached 1.72 mmol/g at 25 °C under 1 bar, which was 5.9 times higher than that of unmodified lignin-based carbon (0.25 mmol/g). Density functional theory (DFT) calculations revealed that B-containing functional groups enhanced the nucleophilicity of B and the electronegativity of surrounding atoms (especially O). N-containing functional groups, especially pyridinic-N (N-6) and pyrrolic-N (N-5), which have high adsorption energies, could avoid excess B oxidation and provide Lewis base sites for CO 2 sorption.
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Nanomaterials
·
2025
·Vol. 15
·期 22
·1686
·
IF 4.3
Yan Xu,Qihua Sun,Jialin Li,Zhaofeng Wu,Haiming Duan
Ethylene glycol (EG) is a vital industrial raw material. However, it has the potential to be hazardous to the environment and human health. High operating temperatures and long response/recovery times limit the wide application of EG sensors. Thus, we need to develop high-performance room-temperature EG-sensing materials. This paper proposes the direct hydrothermal carbonization of magnolia hair to prepare porous microtubular carbon (CMH) for room-temperature EG sensing. SEM, TEM, and XPS characterization showed that the CMH exhibited a porous microtubular structure and contained Na, which enhanced the adsorption capacity of the CMH for ethylene glycol gas. The CMH sensor exhibits a high response (156.4) to 500 ppm ethylene glycol gas at room temperature with moderate response/recovery time (14.2/37.3 s). It exhibits good linearity in measuring EG gases in the 10–100 ppm range, with a 0.292 ppm theoretical detection limit. Additionally, CMH sensors provide excellent repeatability and long-term stability. The synergistic effect of microtubule porous structure and Na doping is the main reason for enhancing the response of the sensor to EG gas. On this basis, the gas-sensitive enhancement mechanism of CMH was analyzed. The results show that biomass carbon materials provide a new method to prepare high-performance EG gas sensors.
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PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2014
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IF 4.258
Tao Sun,Ningning Ji,Meiling Qi,Zhu Tao,Ruonong Fu
Here we report the investigation of using cucurbit[8]uril (CB8) and its coordination complex with cadmium (II) (CB8-Cd) as stationary phases for capillary gas chromatography (GC). The prepared capillary columns of CB8 and CB8-Cd stationary phases achieved column efficiency of 2200 plates/m and 1508 plates/m, respectively, and showed weak polarity based on the measured McReynolds constants. Their separation performance was investigated by GC separation of mixtures of different types while a commercial column was used for comparison. The CB8 stationary phase achieved high resolution for a wide range of analytes from nonpolar to polar while the CB8-Cd stationary phase exhibited good separation mainly for nonpolar to weak polar analytes. The CB stationary phases differ from the commercial one in terms of retention behaviors and resolving ability due to their different molecular interactions with analytes. Moreover, energy effect on the retention of analytes on CB8 and CB8-Cd stationary phases was examined, showing that retention on CB8 column was determined mainly by enthalpy change for polar analytes and by both enthalpy change and entropy change for weak polar analytes whereas retention on CB8-Cd column was mainly controlled by entropy change. This work demonstrates the great potential of CB8 and CB8-Cd stationary phases as a new type of GC stationary phases in GC analysis.
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PubMed
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2020
·
IF 2.627
Pengze Zhang,Yangzhen Jin,Zhaobin Jiang,Guanqun Xie,Qunfeng Zhang,Xiaonian Li
Developing of non-metallic catalyst to replace metal catalyst is a meaningful and challenging direction. In this work, the non-metallic catalyst was synthetized successfully by loading ionic liquid onto the silica surface, which was applied for the gas-phase dehydrochlorination of 1, 1, 2, 2-tetrachloroethane. The 12%TPPC/SiO 2 (wt%) showed the best results with the conversion of 1, 1, 2, 2-tetrachloroethane reaching 100%. The selectivity of 1, 1, 2-trichloroethylene was 100%, and no deactivation was found during the evaluation period. The catalytic mechanism was investigated and possible reaction route was given, which was a reference for fabricating and design of solid base catalyst.
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JOURNAL OF CHROMATOGRAPHY A
·
2012
·
IF 4.531
Kaoqi Lian,Pingping Zhang,Lingmei Niu,Siyuan Bi,Shipeng Liu,Lingling Jiang,Weijun Kang
A new method was developed for determination of ketamine (KT) in urine and plasma samples by derivatization and gas chromatography–mass spectrometry. In this article, KT was first derivatized with sodium nitrite to volatile N-nitrosamines under acidic condition. Then the derivative had been identified by the mass spectra. The derivatization conditions including the amount of hydrochloric acid, the amount of sodium nitrite, reaction temperature, reaction time and the extraction reagents were optimized. Calibration curves were linear in the range of 0.04–20 μg mL −1 for KT, and the limit of detection (LOD) and limit of quantitation (LOQ) were 0.01 μg mL −1 and 0.04 μg mL −1 , respectively. The results of recovery indicated that the method had good precision and reproducibility. Compared with existing derivatization methods, this method provided a rapid, convenient, effective and low-cost way for gas chromatography method of KT quantification.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Zhengdao Li,Yan Xiong,Dongqin Bi,Qi Liu,Chuanyun Yang,Jia Zhang
To optimize the structure and composition of the metal oxide semiconductor is one of effective approaches to improve its gas-sensing performance. In this paper, Zn 2 SnO 4 solid octahedrons were first synthesized by a hydrothermal method , then converted to hollow structures with a shape preserved through a simple and practical acid etching process. Ultimately, the hierarchical ZnSnO 3 /Zn 2 SnO 4 hollow composite with porous structure was designed and prepared by in situ growth of ZnSnO 3 nanosheets on the surface of Zn 2 SnO 4 hollow octahedrons in the seed mediated wet-chemical way. It was found that through the structure evolution from solid octahedron to hollow structure, the sensitivity of gas sensor toward triethylamine (TEA) was visibly improved. Significantly, superior TEA-sensing properties, such as lower optimal working temperature, higher sensitivity, wider linear response range, more rapid response/recovery speed and more excellent selectivity were further achieved by decorating Zn 2 SnO 4 hollow octahedrons with ZnSnO 3 nanosheets. It was remarkable that the sensor based on hierarchical ZnSnO 3 /Zn 2 SnO 4 porous hollow octahedrons displayed long-term stability to TEA and anti-humidity property, suggesting its potential practical applications in detection of highly toxic TEA. The improved sensing mechanism on the strength of structure and composition evolution for the gas sensor was discussed in detail.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Xiao Wang,Wenjing Liu,Chenlin Wang,Shouwei Zhang,Meng Ding,Xijin Xu
Oxygen vacancy construction has been regarded as an effective method to enhance the sensing performance of the gas sensors. Herein, in this work, two CuBi 2 O 4 composites with nanoflowers (CBOF) and nanospheres (CBOS) structures were synthesized with similar BET specific surface area, pore size distributions and exposed facets. However, a higher bulk oxygen vacancy concentration was found in the CBOS composites, bringing a higher carrier concentration and lower baseline resistance. As a consequence, the CBOS sensors exhibited better formaldehyde gas sensing performance (10.9–60 ppm gas) than that of the CBOF sensors (5.8). After treated in NaBH 4 solutions, both composites exhibited enhanced surface adsorbed oxygen species and formaldehyde sensing response, owning to the generation of more surface oxygen vacancies to facilitate the surface adsorptions and redox reactions. After that, the Pt nanoparticles were decorated on the CBOS surface with a reduced method. The formaldehyde sensing response and selectivity were further enhanced due to the surface catalytic activity of the Pt nanoparticles. This work proves that CuBi 2 O 4 composites can be an ideal sensing platform through oxygen vacancy construction and noble metal sensitization, and will facilitate the development of p-type ternary sensing materials.
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高影响因子
FOOD RESEARCH INTERNATIONAL
·
2018
·
IF 3.52
Ye Liu,Congcong He,Huanlu Song
Qualitative and quantitative analysis and odor active value (OAV) calculation were applied to identify the aroma-active compounds of fresh watermelon juice in five varieties: Seedless, Jingxin, Lianfa, Qilin, and Texiaofeng. Principal component analysis and cluster analysis were selected to compare the similarity and difference among watermelons juices. Fifty-five volatiles were identified in watermelon juice in five varieties, among which 6 volatiles were identified for the first time in watermelon. ( Z )-6-nonenal, ( E , Z )-2,6-nonadienal, ( E )-2-nonenal, and ( E , E )-2,4-nonadienal contributed greater to aroma profiles than alcohols due to lower threshold through odor active values. It was indicated by principal component analysis and cluster analysis that watermelon juices were separated into three groups, Jingxin, Lianfa-Texiaofeng, and Seedless-Qilin, whose characteristic volatiles were aldehydes, alcohols, and ketones respectively. The average distance between JX and the other varieties was higher than that of others through cluster analysis, indicating that the aroma of Jingxin differed from that of the other four varieties greatly.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Runhe Jia,Shuaibing Wang,Shulu Wang,Guangyan Du,Jintao Yang
Slickwater fracturing technology as a key means of the efficient shale gas development, relies on polymer molecular chains to reduce turbulent vortices and suppress radial flow fluctuations, thereby lowering fluid frictional drag and enhancing axial transport efficiency. However, conventional linear polymers fail to achieve the “shear thinning-static thickening” of the rheological response, still facing technical bottlenecks such as insufficient viscosity and poor flexibility in flow state transition during deep applications, which limits their fracturing effectiveness in deep shale gas reservoirs. Herein, we developed a tetrameric acrylamide-based polymer, polygamas (AM/AMPS/AA/SMA), via two-phase dispersion polymerization for deep shale gas development. Its hydrophobic groups form a dynamic physical crosslinking network, significantly enhancing tackifying ability. By adjusting the concentration, polyAMAS can freely switch between low-viscosity slickwater and high-viscosity gel fluid, effectively resolving the conflict between friction reduction and proppant-carrying performance. Static proppant-suspension tests showed that under high sand ratio conditions, the solution's settling rate was 0.174 mm/s, meeting the requirements of real-time mixing fracturing operations. The developed acrylamide-based emulsion, integrating friction reduction, proppant transport, and viscosity enhancement, effectively overcomes the key technical challenge of balancing high-efficiency friction reduction and stable proppant-carrying in conventional fracturing fluids, demonstrating significant potential for deep shale gas development.
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Advanced Membranes
·
2025
·
IF 9.5
Qilian Li,Bin Lin,Wei Wei,Zhaoxiang Zhong,Weihong Xing
Silicon carbide (SiC) ceramic membranes are promising for high-temperature gas filtration due to their excellent thermal and chemical stability. However, the industrial deployment of conventional SiC ceramic membranes is limited by their low bending strength and high fabrication cost. This study pioneers a sustainable strategy utilizing industrial waste activated coke fly ash (ACFA), as a dual-functional sintering aid and pore-forming agent for the fabrication of high-performance SiC supports. By systematically investigating the sintering kinetics and phase evolution mechanism of the ACFA-aided SiC supports, we established a composition-property relationship that reveals the critical role of ACFA-derived mineral phases in simultaneously enhancing mechanical integrity and filtration performance. With 12 wt.% ACFA sintered at 1400 °C the SiC support achieved optimal bending strength (28.6 MPa). This bending strength was approximately 25% higher than that of conventional SiC supports (22.8 MPa). Moreover, the ACFA-aided SiC support exhibited satisfactory thermal shock resistance and corrosion resistance during 20 cycles of thermal shocking and alkali metal corrosion tests. This work provides a sustainable route for fabricating cost-effective SiC supports with enhanced mechanical strength to broaden their applications in industrial hot gas filtration.
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Journal of Flow Chemistry
·
2019
·Vol. 9
·期 4
·211-220
·
IF 2.277
Hu JiaYu,Tian Jiaxin,Wang Kai,Deng Jian,Luo Guangsheng
Herein, a continuous synthetic method of tetraethyl thiuram disulfide (TETD) with CO 2 as a weak acid reagent in a gas-liquid microdispersion reaction system has been described. A microdispersion reaction system comprising two microreactors for CO 2 absorption and diethyldithiocarbamate acid subsequent oxidation reaction was developed. In the first step, the main products of absorption and oxidation reactions were identified. Next, the yield of TETD and selectivity of sodium diethyldithiocarbamate under different flow rates of raw materials, amount of CO 2 , aging effect, and pressure in the microreaction system were determined. The yield reached 89.03% based on 60% H 2 O 2 dosage and the selectivity was 92.86% in less than 3 min of residence time, which was more than 30 min in the batch process. The space time yield in the microreaction system was ~20 times of that achieved in the batch process. The study provides a new successful reference for replacing batch synthesis by a continuous process using a microreaction system.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Qingwen Wu,Wenfeng Shen,Dawu Lv,Weigang Chen,Weijie Song,Ruiqin Tan
Resistive-type polyaniline (PANI) based sensing film was fabricated by a simple in-situ polymerization method with graphene (GP) as additives on flexible porous polyvinylidene fluoride (PVDF) substrate. The fabricated flexible GP-PANI/PVDF membrane demonstrates a multi-hierarchical porous microstructure, enhancing its sensing performance towards ammonia (NH 3 ). The optimized GP-PANI/PVDF sensor shows 60% response towards 1 ppm NH 3 with a response time of 46 s, and 10% response towards 0.1 ppm NH 3 at 24℃, respectively. Moreover, the GP-PANI/PVDF sensor presents excellent flexibility, exhibiting only small response values’ difference upon several bending angles and after 1500 bending/extending cycles. Besides, the GP-PANI/PVDF sensor exhibits a strong linear relationship between the NH 3 response values and working temperatures with a range of 24℃∼50℃. The results demonstrate that the flexible GP-PANI/PVDF film sensor holds great promise for the application of portable, lightweight, and room temperature sub-ppm level NH 3 detection devices.
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