Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Hanling Jiang,Yuting Chen,Aijuan Zhou,Xiaobo Gong,Juanying Yang,Jingwen Wang,Yong Liu
The selective oxidation of ammonia nitrogen (NH 4 + -N) to dinitrogen (N 2 ) by persulfates (PS)-based advanced oxidation processes (SR-AOPs) without the input of light or electrons is desired, but presents enormous challenges. In this study, S-doped carbon nanotubes (SCNTs) were prepared via a high-temperature sintering process and used to activate PS for NH 4 + -N oxidation in the presence of magnesium oxide (MgO). Compared with pristine carbon nanotubes (CNTs), SCNTs improved the N 2 selectivity of NH 4 + -N oxidation by SR-AOPs, which was attributed to the lower impedance of SCNTs than that of CNTs, enhancing the direct electron transfer pathway of NH 4 + -N oxidation. In the SCNTs/PS/MgO process, the non-radical pathway dominated the oxidation of NH 4 + -N. When SCNTs/PS/MgO process treated polluted lake water, 84.0% of NH 4 -N removal and 85.8% selectivity towards N 2 were achieved at initial pH of 6, initial NH 4 + -N concentration of 30 mg N/L, SCNTs dosage of 8 g/L, the mass ratios of SCNTs to PS of 1: 1, and reaction time of 60 min, highlighting its potential for practical applications.
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高影响因子
MOLECULES
·
2024
·Vol. 29
·期 16
·3843
·
IF 4.2
Xinbao Li,Kai Sun,Ying Chen,Ye Yuan
As a widely used support, TiO2has often been combined with Pd to form highly sensitive gas-chromic materials. Herein, we prepared a series of Pd/TiO2catalysts with different Pd content (from 0.1 to 5 wt.%) by the impregnation method for their utilization in fast room-temperature CO detection. The detection was simply based on visible color change when the Pd/TiO2was exposed to CO. The sample with 1 wt.% Pd/TiO2presented an excellent CO gasochromic character, associated with a maximum chromatic aberration value of 90 before and after CO exposure. Systematic catalyst characterizations of XPS, FT-IR, CO-TPD, and N2adsorption–desorption and density functional theory calculations for the CO adsorption and charge transfer over the Pd and PdO surfaces were further carried out. It was found that the interaction between CO and the Pd surface was strong, associated with a large adsorption energy of −1.99 eV and charge transfer of 0.196e. The color change was caused by a reduction in Pd2+to metallic Pd0over the Pd/TiO2surface after CO exposure.
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PubMed
高影响因子
ACS Sensors
·
2025
·
IF 9.1
Chuanxuan Zhou,Shaowei Li,Fuchao Yang,Zhiguang Guo
Ultrasensitive detection of triethylamine (TEA), a characteristic volatile in seafood, is particularly important for food safety and human health. The preparation of nanosensing materials with special structures is an important step toward high-performance TEA detection. This study introduces a novel method of loading noble metal catalysts onto the inner walls of WO3 macroporous nanofibers (MNFs) to prepare high-performance TEA sensing materials by using core–shell nanospheres with glucose-coated Ag particles as sacrificial templates. After high-temperature calcination, WO3 MNFs loaded with Ag particles on the inner wall (Ag-WO3 MNFs) were obtained by decomposition of organic components and oxidation of W precursors. The abundant porous structure, large number of oxygen vacancies and strong sensitizing effect of Ag particles give Ag-WO3 MNFs excellent sensing performance. Gas sensing measurements reveal that 1.5% Ag-WO3-based sensor responds to 1 ppm TEA with a response time of 1 s, a response value as high as 1054.17 (Ra/Rg), and a low detection limit (12.8 ppb) at 185 °C. The adsorption process of gas molecules on the surface of Ag-WO3 MNFs is revealed using density-functional theory (DFT) calculations. The integration of this distinctive design concept with an in-depth mechanistic investigation offers a novel strategy for engineering high-performance TEA sensing materials.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xiaole Dong,Shihui Wang,Bingqi Tan,Xiangyi Geng,Futang Liu,Penghao Gao,Peiling Gao,Jiutao An,Xinpeng Liu,Qingmei Meng
Different nanoparticles were introduced into the N-ethylethanolamine/diethylaminoethanol/p-Xylene biphasic absorbent to form nanofluid systems, and the CO 2 capture performance was investigated. The CO 2 capture performance of the absorbent was significantly enhanced by introducing 0.1 wt% CuO nanoparticles, with a first absorption carbon capacity of 0.09952 g CO 2 ·g −1 absorbent. In the first cycle of regeneration, [email protected] % CuO nanofluid had a carbon capacity of 0.07654 g CO 2 ·g −1 absorbent, achieving an efficiency improvement of 35.73 %. Its regeneration energy consumption was reduced by 0.3256 GJ·t -1 CO 2 , representing a 15 % decrease compared with the base liquid. The cyclic absorption capacity was enhanced significantly after the addition of CuO, with a CO 2 capacity at 0.0690 g CO 2 ·g -1 absorbent after four cycles. The characterization of CuO revealed the stability of nanoparticles in nanofluids. In addition, it was found that the nanoparticles exhibited phase-transfer characteristics. After absorption, they accumulated in the rich phase and then became uniformly distributed throughout the entire liquid phase following regeneration. This behaviour could promote a more efficient desorption process. This study provides a new approach for green chemistry and carbon capture applications.
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Catalysts
·
2025
·Vol. 15
·期 9
·799
·
IF 4
Xuhui Wei,Ruoyang Du,Rushan Zhao,Wenzhi Li,Caihong Jiang,Junwei Wang
The efficient removal of elemental mercury (Hg0) from coal-fired flue gas is a critical challenge in environmental governance. This study proposes utilizing waste fluid catalytic cracking catalyst (WFCC) as the potential support for Hg0catalytic oxidation. After activation (AFCC) via calcination decarbonization, a composite support (AFCC-PG) was fabricated using palygorskite (PG) as a binder. Subsequently, VOxwas loaded onto the support to form the VOx/AFCC-PG catalyst for Hg0removal. Experimental results demonstrate that the VOx/AFCC-PG catalyst achieves >95% Hg0removal efficiency under simulated flue gas conditions (150 °C, GHSV = 6000 h−1) while maintaining excellent stability over 60 h. Furthermore, Hg-TPD and XPS analyses indicate that the synergistic lattice oxygen oxidation–adsorption established between VOxand the AFCC-PG plays a key role in efficient Hg0removal. This study proposes a cost-effective strategy for both the resource utilization of waste catalysts and the control of mercury pollution in coal-fired flue gas.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Hang Liu,Junlong Liu,Yanchang Liu,Zhihao Qu,Siye Tian,Yuhong Zhang
In this work, the ZnO microsphere is prepared by hydrothermal method and modified with different concentrations of Eu. The morphology of ZnO:Eu sample shows flower-like microspheres with many nanosheets. The gas performance of ZnO:Eu microsphere is investigated for detecting NO 2 . Compared with pure ZnO, the response of ZnO:2 % Eu sensor is increased by 8 times, and the optimal operating temperature of that is decreased to 130 °C. Especially, the gas sensing properties of ZnO:2 % Eu sensor is enhanced under UV excitation. The recovery time of ZnO:Eu sensor is reduced by 1200 s, and the response is increased by 3.6 times under UV excitation. The above results show an increase in sensor response due to doping Eu and UV excitation. At last, the possible gas mechanism of ZnO:Eu is discussed with and without UV excitation. This finding provides important guidance for UV-assisted sensors to enhance NO 2 response.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Shuai-ying Ding,Huang Du,Zhen-liang Tan,Ke-hui Gou,Yi-dan Hou,Ji-kun Yin,Xiu-xiu Guo,Bo Wang
Metal-organic frameworks (MOFs), with the characteristics of intrinsic pore channels and adjustable pore structure, are deemed as potential membrane materials. Most researches aimed at constructing MOFs-based mixed-matrix membranes (MMMs) within polymer as the matrix. Herein, we proposed the in-situ construction of a zinc-gel-ZIFs MMMs within a zinc-gel matrix, which shows the following features. First, the metal gel, with a high-density metal source, participates the coordination reactions, which induces the oriented growth of MOFs as independent gas transport channels; Second, the gel network, similar to polymers, not only maintain the structural densification but also enhance the interfacial compatibility during in-situ growth process. A 3-fold increase in the Young's modulus compared with polymer matrix counterparts explains the excellent bending resistance and high-pressure separation ability; Third, the stable solvent and residual metal gels in the gel network can further facilitate the gas adsorption, and the optimal zinc-gel-ZIFs MMMs shows competitive CO 2 /N 2 and CH 4 /N 2 separation performance compared with state-of-the-art membranes.
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高影响因子
IEEE SENSORS JOURNAL
·
2025
·
IF 4.5
Mengxue Xu,Yihong Zhong,Xiaochun Hu,Yi Tao,Qingqing Shen,Shumin Zhang,Pingping Zhang,Hongpeng Zhang,Zhenxing Cheng,Xuhui Sun
Given the severe threats of chemical warfare agents (CWAs) to public safety, gas sensing technology development is vital. Metal oxide semiconductor (MOS) based gas sensors are popular for detection of CWA simulants, which have been widely used in the safe study of CWAs detection due to their similar structure and properties with actual CWAs. But the reported MOS sensors still suffer from high power consumption and poor selectivity of discriminating multiple simulants. In this work, an electronic nose (e-nose) driven by artificial intelligence (AI) algorithms is established to detect and identify five CWA simulants. The e-nose consists of 24 MOS based micro-electro-mechanical system (MEMS) gas sensors that own advantages of small size (0.9 mm×0.9 mm), low-power (<10 mW in average), and exhibits good sensing performances of relatively high response, low detection limit, wide concentration detection range, considerable reversibility and stability towards CWA simulants. Methods are proposed to extract three types of features from sensing performances (the steady-state response, maximum response and response time), initial response rate coefficient, and global change trend in the response stage, respectively. Subsequently, linear discriminant analysis (LDA) was utilized and back propagation network (BPN) was optimized to identify the simulants, obtaining preliminary separated classes in 3D LDA space and high prediction accuracy (>99.0%) with BPN, respectively. These results suggest that the AI driven e-nose strategy has highly potential to be applied as a portable equipment for rapid, on-site detection and identification of CWA simulants and even actual CWAs.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Shiyong Zhang,Zhenlong Zhao,Lihua Jia,Xiangfeng Guo,Rui Yang,Qingfang Deng,Desheng Zhang
Nitric oxides emission, especially nitrogen dioxide (NO 2 ), has aroused a series of environment and ecological problems and damaged human health, it is of great significance to monitor the NO 2 concentration in the atmosphere. However, developing the real-time NO 2 sensors remains challenge due to high working temperature, limited sensitivity at the low temperature and poor selectivity. Hence, we designed and synthesized the SnO 2 -M-O V - T sensors through thermal treating the Sn metal organic frameworks (Sn-MOF), and the prepared SnO 2 -M-O V - T sensors exhibits the excellent sensing performance under a low operating temperature. The response value of SnO 2 -M-O V -300 sensor for NO 2 could reach 11677 at 120 °C, that is 100 times than pristine SnO 2 , and the response value of 170 was also achieved even at the low temperature of 50 °C. In addition, the SnO 2 -M-O V -300 sensor also showed the good cyclicity and stability for NO 2 detection. Density functional theory results show that both the oxygen vacancy and Sn atom act as the adsorption and active sites during the process of NO 2 gas sensing, yet the role of oxygen vacancy prefers the adsorption and charge transfer for NO 2 than of Sn atom. The high-performance SnO 2 -M-O V - T gas sensors display a broad application prospect in the real-time monitoring NO 2 industrial field.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Jiang Haotian,Zhang Jie,Wei Li
Superior gas sensing properties may be obtained by forming suitable metal/semiconductor nanocomposites. In this work, gold (Au) was utilized to form composite nanofibers with tin oxide (SnO 2 ) to detect nitric oxide (NO) gas. Au/SnO 2 composite nanofibers were synthesized through a facile electrospinning and annealing treatment. Various techniques, including XRD, SEM, TEM, UV–vis, XPS, and BET, were used to characterize these Au/SnO 2 heterostructures. The characterization results demonstrate that Au exists in the form of metallic clusters even at an extremely low concentration of 0.1 at% and, it can provide more active sites and chemisorbed oxygen species due to its spillover effect. The gas sensing results show that the Au/SnO 2 composite nanofibers exhibit excellent sensing performance to NO at 130 °C. Specifically, the composite nanofiber with 0.1 at% Au shows an ultrahigh response of 183 (resistance ratio) to 100 ppb NO gas at 130 °C. The sensor exhibits good selectivity, repeatability, and long-term stability. These remarkable sensing properties indicate that Au/SnO 2 composite nanofibers have promising applications to some demanding fields such as detecting NO from human exhaled breath.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jing Bai,Chenxu Qiu,Yanhui Wang,Qianqian Zhu,Zheng Yan,Chun Chang,Pan Li,Dongyang Li
Separating CO 2 from flue gas through hydrate method owns many advantages, including easy operation, environmental friendliness, low-energy consumption during the process, and the potential for water recycling in the reaction. This study investigated the effects of cyclopentane (CP, 5.0 vol%), methionine (L-Met, 0.2 wt%), and alkyl polyglucosides (APG) with various carbon chain lengths as additives on the kinetics of flue gas hydrate generation in a simulated power plant environment, with a focus on gas separation efficiency. Key parameters, including impinging strength ( β ), feed pressure, initial temperature, and APG carbon chain length, were systematically investigated to optimize the hydrate formation process. The results reveal that gas consumption ( Δ n H ), average reaction rate ( R H ), and CO 2 capture rate ( S.Fr. (CO 2 )) initially increases with β , reaching a peak before decreasing, while the CO 2 separation factor ( S.F. (CO 2 )) consistently increased. Higher feed pressures and lower initial temperatures enhanced gas consumption, thereby accelerating the hydrate formation and improving separation efficiency. Additionally, the optimal APG carbon chain length significantly enhanced both the kinetics of hydrate formation and gas separation efficiency. Specifically, under conditions of 6 MPa, 275.15 K, and β = 0.13, the CP+L-Met+APG0814 system achieved a maximum Δ n H of 0.509 mol, an R H of 0.102 mol/h, and a S.F. (CO 2 ) of 82.4 %, demonstrating the potential for improved CO 2 capture in hydrate-based separation processes.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2025
·Vol. 19
·期 12
·1-11
·
IF 4.5
Pan Chunhong,Wang Biao,Mao Jinman,Li Mengjia,Wang Huimin,Chen Wenyi,Gao Feng,Hu Guoping,Fan Xiaolei,Huang Feng
Reverse water-gas shift reaction represents a strategic pathway for CO 2 utilization. Despite its potential, reverse water-gas shift reaction via conventional thermal-catalysis faces several challenges, including low equilibrium conversion rates due to thermodynamic constraints, high energy consumption, and insufficient product selectivity. Here, this study demonstrates an evident synergetic effect between plasma and Ag/ZnO, on enhancing reverse water-gas shift reaction. The plasma catalytic system achieved significantly improved performance with a remarkable CO 2 conversion rate of 76.5%, a high CO selectivity of 96.8% and a CO yield of 74.1%, along with an energy efficiency as high as 0.19 mmol·kJ −1 , surpassing the plasma alone system and ZnO catalytic systems. Results from X-ray photoelectron spectroscopy and Auger electron spectroscopy confirm the presence of electronic metal-support interactions between Ag and ZnO, which facilitates the formation of electron-deficient Ag sites and partially reduced ZnO x species. These reactive sites, along with oxygen vacancies created during reduction treatment, enhance the adsorption and activation of H 2 and CO 2 , offering a dominant plasma-assisted surface reaction pathway for the improved reverse water-gas shift reaction. These findings underscore the crucial role of electronic metal-support interactions in manipulating surface environments to facilitate efficient plasma-assisted catalytic reactions, with significant implications for the rational design of catalysts capable of converting CO 2 efficiently under mild conditions.
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