JOURNAL OF CHROMATOGRAPHY A
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2017
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IF 3.981
Yunzhong Zheng,Qing Han,Meiling Qi,Liangti Qu
Seaweed-like graphitic carbon nitride (g-C 3 N 4 ) has a unique porous architecture composed of interlocking g-C 3 N 4 nanofibers (NF-C 3 N 4 ) with much higher surface area than bulk g-C 3 N 4 and shows good potential in separation science. This work investigated the separation performance of NF-C 3 N 4 as stationary phase for capillary gas chromatographic (GC) separations. The NF-C 3 N 4 column exhibits weak polarity and high column efficiency of 4728 plates/m for n -dodecane. Importantly, it displays good separation performance for a wide range of analytes and shows different retention behaviors from the bulk g-C 3 N 4 column and commercial HP-5MS column with 5% phenylpolysiloxane. Particularly, it shows high resolving capability for both aliphatic and aromatic isomers. In addition, NF-C 3 N 4 column has high thermal stability up to 280 °C and good separation repeatability with relative standard deviation (RSD) values in the range of 0.29–0.61% for intra-day, 0.56–1.1% for inter-day and 2.0–4.9% for between-column, respectively. Moreover, it was applied for the determination of isomer impurities in real samples, showing good potential in GC applications.
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FUEL
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2017
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IF 4.601
Yiquan Guo,Junying Zhang,Yongchun Zhao,Shaolong Wang,Cheng Jiang,Chuguang Zheng
Fly ash fine particles emitted from coal-fired power plants are the primary atmospheric pollutant in China. The pressure, temperature, and velocity distribution of the flow field in a chamber was simulated to evaluate chemical agglomeration. The effect on the removal efficiency of composition, concentration, pH, K + content, and zeta potential of the chemical agglomeration solutions as well as surfactant and flue gas temperature were evaluated. The results suggested that suitable solutions could significantly improve the removal efficiency of fine particles. Among these, kappa-carrageenan performed best and achieved a removal efficiency of 47.1%. Synergism was detected as two different chemical agglomeration solutions were mixed together: a mixture of kappa-carrageenan and konjac glucomannan attained a removal efficiency of 59.3%, higher than their individual values. The efficiency improved initially and then decreased as the solution K + concentration increased. Also surfactants affected agglomeration: cationic and non-ionic surfactants enlarged the removal efficiency by 9.0% and 3.7%, respectively, whereas anionic surfactants lessened average removal efficiency by 5.6%. Zeta potential influenced the removal efficiency as well: it peaked as the zeta potential was around 0 mV.
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Surfaces and Interfaces
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2025
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IF 6.3
NiNa Ma,ShuYi Ma,JiaYun Guo,GeGe Fan,Ping Ni,YinYue Wang,JiaMin Zhu,Heng Wang
In this study, we engineered a triethylamine sensor that operates at low temperatures and is distinguished by its exceptional selectivity. The experiments specifically entailed synthesizing WO 3 nanostructured composites and SnWO 4 nanorod model materials through a direct hydrothermal approach. The superiority of composite samples over pure ones was established by evaluating their gas sensitivity through rigorous testing. Given the importance of accurately detecting trimethylamine gas in intricate environments, it is remarkable that only a limited number of sensors possess this capability. To tackle this problem, we have engineered a triethylamine sensor that exhibits strong resistance to interfering gases, delivering an outstandingly swift response time of 50 s and a recovery time of just 7 s. The composite sensor demonstrates remarkable sensitivity to 200 ppm of triethylamine gas, exhibiting a response that is 5.4 times more pronounced than that observed in the pure sample. The integration of WO3 notably decreases the optimal operating temperature of the SnWO 4 sensor from 240 °C to 130 °C, while also demonstrating a response value of 6.6 at reduced gas concentrations of 5ppm. Furthermore, the engineered gas-sensitive material demonstrates remarkable repeatability and enduring stability upon exposure to triethylamine. Further discussion delved into the gas sensing mechanism of the WO 3 /SnWO 4 gas sensor. In conclusion, this study presents a novel perspective on the sensitivity and selectivity of gas sensors, demonstrating extensive practical utility and significant application value.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Wenhui Zhou,Yue Zhao,Boxu Dong,Hongran Guo,Ziqi Si,Fengxiang Ma,Shan Zhu,Jiantao Zai,Xuefeng Qian
Sulfur hexafluoride (SF 6 ), widely used in industries, poses a significant threat as the strongest greenhouse gas. Current methods for degrading SF 6 are hindered by high energy consumption and costs, thus there is an urgent need for a low-cost, convenient, and efficient solution. In response, we established a gas-liquid-solid three-phase (GLS) system for efficient photocatalytic SF 6 degradation by Bi 2 O 2 CO 3 , whose efficiency was approximately 20 times that of traditional gas-solid systems. Further, possible degradation mechanisms were demonstrated through the detection of material changes in three phases, respectively. Detailed studies revealed Bi 2 O 2 CO 3 can in-situ form Bi 2 S 3 heterojunction during the reaction, facilitating carrier separation. Besides, O 2 can transform to ·O 2 − and accelerate the photodegradation process. This approach offered a novel toolbox for SF 6 degradation. We predict this method will have a wider range of applications in the field of solar-powered catalytic degradation of extremely stable fluorinated pollutants at lower costs in the future.
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SENSORS AND ACTUATORS A-PHYSICAL
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2024
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IF 4.1
Rongcai Jia,Liang Guo,Wei Yang,Dezhao Wang,Zhengzhe Li
Hydrogen sulfide (H 2 S) is a highly toxic gas commonly encountered in industrial settings, posing substantial health risks to workers. Therefore, the development of sensors with optimized operating temperatures, rapid detection speeds, and broad measurement ranges is of paramount engineering significance. In this study, ZnFe 2 O 4 /MoO 2 nanocomposites were synthesized using a hydrothermal method, and, for the first time, MEMS-based gas sensors utilizing ZnFe 2 O 4 /MoO 2 nanocomposite films were employed for hydrogen sulfide detection. The structural composition and morphology of the ZnFe 2 O 4 /MoO 2 (2:1) samples were characterized through X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The gas sensitivity of ZnFe 2 O 4 /MoO 2 toward H₂S was systematically investigated. Gas sensitivity tests demonstrated that the ZnFe 2 O 4 /MoO 2 composite sensor exhibited a response value of 19.177 at 5 ppm hydrogen sulfide, which is 5.2 times greater than that of ZnFe 2 O 4 , the current dominant material for H₂S detection. Furthermore, the ZnFe 2 O 4 /MoO 2 composite sensor demonstrated a detection limit as low as 1 ppm and exhibited significantly faster response and recovery times (13 s and 11 s, respectively, for 5 ppm H₂S). The ZnFe 2 O 4 /MoO 2 (2:1) nanocomposite sensor exhibited excellent stability, sensitivity, and remarkable selectivity. This enhanced gas-sensing performance is attributed to the formation of n-n heterojunctions between ZnFe 2 O 4 and MoO 2 , as well as the optimized nanomorphology of the composite. Therefore, the ZnFe 2 O 4 /MoO 2 sensor presents a promising solution for hydrogen sulfide detection in industrial applications.
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INORGANIC CHEMISTRY COMMUNICATIONS
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2024
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IF 4.4
Diwei Deng,Ping Ma,Xianliang Li,Xiaoyu Chen,Yan Xu
Metal oxide heterostructures have been demonstrated excellent candidates acting as novel gas sensors with outstanding sensitivity and selectivity . In this work, a hierarchical NiGa 2 O 4 @C@CeO 2 heterostructure with corn-like NiGa 2 O 4 microcrystals covered by a thin carbon layer and then anchored with numerous amounts of external CeO 2 nanoparticles was prepared through the combination of hydrothermal and a subsequent calcination method. The NiGa 2 O 4 @C@CeO 2 composite demonstrates an excellent selective triethylamine (TEA) detection performance with a response of 11.1 towards 20 ppm TEA and a fast response/recovery time of 81 s/38 s. It also shows terrific selectivity for TEA when mixed with else interfering substances, along with prolonged reusability for at least 15 days. The enhanced TEA sensing performance can be ascribed to the significant improvement of conductivity and effective carrier transfer at the interface. This work provides a feasible method to fabricate metal oxide sensors with improved gas sensing performance.
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JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Ji Ma,Wen He,Weiwang Lim,Jingcheng Du,Qian Sun,Shabi Ul Hassan,Dong Cao,Jian Guan,Jiangtao Liu
Polyimide membranes offer the potential of industrial natural gas sweetening to effectively diminish carbon dioxide from raw streams, but it remains a challenge to improve the separation selectivity and further overcome the trade-off limitation through synthesis design. Here, we present an A 2 +B 2 +B 3 strategy to fabricate a series of polyimides containing hyperbranched network structures by copolymerizing the triamine monomer (TAPA) in conjunction with linear 6FDA-6FAP. The chemical structures and physicochemical properties of polyimides were confirmed by SEM, FTIR, XPS, TGA and XRD. The molar ratio changes of 6FAP/TAPA finely tailored the fractional free volume from 16.9 % to 13.1 % and brought about high packing efficiency, leading to a surge in separation selectivity. The 6FDA-6FAP/TAPA (7:3) membrane exhibited a maximum CO 2 /CH 4 selectivity of 134.5 with a permeability of 26.9 Barrer, improving the CO 2 /CH 4 separation performance of 6FDA-6FAP from far below the 1991 limitation to beyond the 2008 Robeson's upper bound line. Diffusivity and solubility acting as the main factors that govern the gas separation were also carefully investigated. Additionally, 6FDA-6FAP/TAPA(7:3) demonstrated high CO 2 /CH 4 binary gas separation performance, good high-temperature (105 °C) reversibility, great plasticization resistance (20 bar) and moderate long-term stability (360 days) under practical working conditions. These results indicate that hyperbranching of polyimide can be successfully controlled to enhance the separation properties, which facilitate the development of high-performance gas separation membranes with topological microstructures.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Zhidong Jin,Jinbo Zhao,Chuanzhi Chen,Huan Zhou,Nan Xiang,Fei Liu,Lin Liu,Jiurong Liu,Yue Mou,Lili Wu
Constructing heterojunctions in semiconductor-based sensors is a vital method of modulating electronic structures and designing high-performance sensors for toxic gas detection. In this study, F-doped SnS x (F-SnS x ) decorated ZnOHF composites were acquired via a two-step solvothermal method . The experimental results confirmed the establishment of heterojunctions between ZnOHF and F-SnS x . The optimized F-SnS x decorated ZnOHF snowflake-like nanoflowers-based NO 2 sensors exhibited incomparable selectivity along with supreme sensitivity (S = 137–10 ppm NO 2 at 200 ℃), rapid responding/recovering speed (34 s/6 s) and low detection limit (50 ppb). NO 2 sensing mechanism and the influence of humidity interference on NO 2 sensing performances were fully discussed. This work not only evidences the great potential of F-SnS x /ZnOHF snowflake-like nanoflowers for NO 2 recognitions but also paves a feasible routine for advancing NO 2 sensing performances by electronic structure regulations.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Ling Zhang,Mengfang Li,Xuan Liu,Jiaqi Feng,Yujia Liu,Yazhu Tu,Shuyang Li,Tao Duan
The exploration of effective gaseous iodine adsorbents is an interesting and challenging task in the field of radwaste disposal. In this study, amidoxime groups (AO) were successfully grafted onto polyacrylonitrile to obtain amidoxime grafted polyacrylonitrile (PAN-AO) for capturing gaseous iodine. The results of the combined characterization analysis have confirmed that the introduction of AO greatly improved its thermostability, porosity and available functional groups of PAN. The impacts of reaction time, iodine concentration and reaction heat on the uptake capacity for gaseous iodine were systematically studied. The PAN-AO exhibited higher iodine capture capacity (1534.4 mg/g) than PAN (72.1 mg/g) at 80 °C and 600 min, which was ascribed to the chemical reaction between electron-rich AO groups and electron-deficient iodine molecules. The studies of kinetic fitting and activation energy (E a = 44.11 kJ/mol) further confirmed that chemical adsorption was the major fashion during the whole uptake process of PAN-AO for iodine. Besides, PAN-AO still had an iodine uptake capacity of 704.4 mg/g after five recycling, manifesting the remarkable cycle performance of PAN-AO. In brief, this study offered a new reference for radioactive iodine uptake and the synthesized PAN-AO was able to serve as an efficient iodine capture material.
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Small
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2024
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IF 13
Xue Hu,Zhiying Li,Jianbo Li,Chuanlong Jin,Junjiang Bao,Xiaopeng Zhang,Xiaobin Jiang,Ning Zhang,Gaohong He
Membrane technology exhibits low cost and high efficiency in gas separation. Zeolite-imidazole framework-67 (ZIF-67) membrane shows a theoretically superior performance in H 2 /CO 2 separation, owing to its effective size-sieving pores between H 2 and CO 2 . However, the gas molecules are permeate through a series of consecutive crystal cells of common ZIF-67 polycrystalline membranes, resulting in high transport resistance to the gas permselective transport. To this end, this work employs a contra-diffusion synthesis to construct a honeycomb ZIF-67 (h-ZIF67) crystalline membrane for low-resistance H 2 /CO 2 permselective transport. The controlled growth of h-ZIF67 following the van der Drift theory produces the honeycomb polycrystal with hierarchical channels for low-resistance gas permeation. The prepared membrane with micron-scale thickness still achieves a H 2 permeance as high as 1.6 × 10 −7 mol m −2 s −1 Pa −1 and a H 2 /CO 2 selectivity of 17, which can be maintained after a long-term operation for the H 2 /CO 2 mixture separation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Xiaoli Fan,Xin Song,Jingxue Sun,Yangpeng Zhang,Zhonghua Li
Covalent-organic frameworks (COFs), characterized by their exceptional light absorption and ordered architecture, have emerged as potential candidates for photocatalytic hydrogen production. In this work, we discovered that the incorporation of fluorine into the sub-nanocavity of azine-linked COF (TF-COF) not only augments its hydrophobicity but also strengthens the interaction between Pt cocatalysts and COFs. In an effort to enhance photocatalytic water splitting efficiency, we integrated the hydrophobic TF-COF with the hydrophilic carbon nitride (CN) to construct a hydrophilic/hydrophobic heterojunction (CTF-x heterojunction). Both experimental results and density functional theory (DFT) calculations reveal that the hydrophilic side, CN, aids in the adsorption and transfer of water molecules, whereas the hydrophobic side, TF-COF, generates hydrogen and promotes its overflow, thereby achieving space charge separation. The hydrogen evolution activity of CTF-50 % (with a CN content of 50 %) reached an optimal value of 2428 μmol g −1 h −1 , with an apparent quantum yield (AQY) of 2.6 % at 400 nm. This is approximately four times higher than that of pure CN and ten times greater than that of TF-COF. We believe this work will provide valuable insights for developing efficient heterojunction photocatalysts.
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ANALYST
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2024
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IF 3.6
Mengyi Ba,Wen Li,Yanli Song,Yuanyuan Zhang,Xiang Xu,Haixin Liu,Zhiqiang Cai,Shaoqiang Hu,Xianming Liu,Tao Sun
Here we report the first example of employing hydroxyl-functionalized pillar[5]arene (P5A-C10-OH) as stationary phase for capillary gas chromatographic (GC) separations. The statically coated P5A-C10-OH capillary column possessed moderate polarity and column efficiency of 3233 plates per m determined by n-dodecane. As a result, the P5A-C10-OH column exhibited high-resolution capability for the mixture of 17 analytes from apolar to polar nature. Importantly, it exhibited advantageous performance for high resolution of the challenging isomers of bromonitrobenzene, chloroaniline, bromoaniline, iodoaniline and dimethylaniline with good peak shapes over the P5A-C10 and commercial HP-35 columns. In addition, eight cis-/trans-isomers with diverse types were baseline separated on the P5A-C10-OH column. And the application of detecting isomeric impurities in real samples gave strong evidence of its potential and feasibility for the viable GC analysis.
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