SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Yongjiao Sun,Jun Li,Yuchen Hou,Bingliang Wang,Wendong Zhang,Koichi Suematsu,Lin Chen,Jie Hu
Electrically conductive metal-organic frameworks (EC-MOFs) exhibit significant potential application as sensing materials for chemical resistance gas sensors. Herein, we developed a flexible gas sensor based on Ni 3 (HITP) 2 nanosheets co-functionalized with noble metal nanoparticles (NPs) and WS 2 quantum dots (QDs) for NO 2 detection at room temperature. The gas sensing performance was regulated by optimizing the metal species and loading ratios of WS 2 QDs. The measured results revealed that Au NPs and 2 mol% WS 2 achieved the most effective enhancement for NO 2 sensing performance. Therefore, Au NPs was selected to optimize WS 2 -2/Ni 3 (HITP) 2 sensor for further improving the sensing properties. A unique hierarchical structure based on gas sensor (Au 3 @WS 2 -2/Ni 3 (HITP) 2 sensor) enables high response (14.73 % to 5 ppm NO 2 ), rapid response/recovery time (97 s/110 s), good selectivity, anti-humidity, repeatability, long-term stability as well as flexibility at room temperature. Furthermore, density functional theory (DFT) and band theory were employed to comprehend adsorption energies and the electronic structures at atomic scale, elucidating the intrinsic correlation between NO 2 adsorption behavior and Ni 3 (HITP) 2 surface and the sensitization mechanism of heterostructures. These findings provide novel insights for designing high-performance NO 2 gas sensors worked at room temperature and guidance for EC-MOFs sensing mechanism.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 13
·13602-13618
·
IF 2.914
Yue Huifang,Lu Pei,Su Wei,Xing Yi,Li Rui,Wang Jiaqing
To optimize the simultaneous removal of NO x and Hg 0 , a series of Cu a Ce b Zr c O 3 /γ-Al 2 O 3 catalysts prepared by the impregnation method were explored and their physical and chemical properties were analyzed by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis, X-ray photoelectron spectroscopy (XPS), NH 3 -temperature-programmed desorption (NH 3 -TPD), H 2 -temperature-programmed reduction (H 2 -TPR), in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFT), and Fourier transform infrared spectroscopy (FT-IR). The results showed that 15% Cu 1.4 Ce 0.55 Zr 0.25 O 3 /γ-Al 2 O 3 resulted in the highest conversion efficiency for the simultaneous removal of NO x (93%) and Hg 0 (85%) at low temperatures (200 to 300 °C). Meanwhile, 15% Cu 1.4 Ce 0.55 Zr 0.25 O 3 /γ-Al 2 O 3 showed good stability and resistance to SO 2 and H 2 O, which is due to its low crystallinity, good textural performance, and strong redox ability. According to the TPD, TPR, and XPS results, the strong acidic character of 15% Cu 1.4 Ce 0.55 Zr 0.25 O 3 /γ-Al 2 O 3 promoted the removal of NO x and Hg 0 . The synergistic effect between CuO and CeO 2 in 15% Cu 1.4 Ce 0.55 Zr 0.25 O 3 /γ-Al 2 O 3 can increase the mobility of chemically adsorbed oxygen and activates lattice oxygen, leading to an excellent performance. The DRIFT results showed that NH 3 , NH 4 + , nitrate, and nitrite participated in the selective catalytic reduction (SCR) reaction. On the basis of our experimental results, Hg 0 and NO x removal mechanisms were proposed as Hg (ad) + O* → HgO (ad) and 2NH 3 /NH 4 + (ad) + NO 2 /NO 3 − (ad) + NO→2N 2 + 3H 2 O/2H + , respectively.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ting Huang,Yunyi Ge,Xiao Zhang,Boxiong Shen,Feng Shen
Water poisoning of catalysts presents a significant practical challenge in the removal of pollutants from coal-fired flue gas. Herein, a highly water-resistance Mn catalyst, with a structure of hollow spheres (NS) assembled by nanosheets and modified by inorganic siloxane was developed. The hydrophobic catalyst (Mn-Si 0.06 /NS) showed a 50% increase in VOC removal efficiency compared to Mn/Al 2 O 3 when exposed to wet flue gas containing 10 vol% water vapor. Strikingly, Mn-Si 0.06 /NS exhibited robust SO 2 resistance, especially under flue gas with high water vapor content. Mechanistic results shows that the enhanced water resistance of catalyst resulted from the synergy between morphological structure and the inorganic siloxane modification. DRIFTS and XPS analyses showed that the catalyst effectively prevented the water poisoning effect, which involves lattice oxygen consumption and transformation. The ability of catalyst to utilize oxygen under wet flue gas was also confirmed by product analysis, which revealed a clear preference for the oxidation reaction path of o-xylene compared with Mn/Al 2 O 3 . Molecular dynamics (MD) simulations show the dynamic scenario of VOC and water vapor adsorption on the catalysts and provide an intuitive picture of the catalysts' water resistance.
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JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 11.3
Dehua Wang,Qixi Duan,Hai Sun,Jiahao Li,Zhenyu Zhu,Zhaolong Fang,Yanxing Yang,Yong Yang
MXene-based materials have received increasing attention in gas sensing due to their excellent electrical conductivity and favorable surface properties. However, their practical applications are severely limited by low sensitivity, limited selectivity and poor stability. In this study, a robust sandwich-like 2D/0D/2D MXene@TiO 2 /ZnIn 2 S 4 ternary integrated heterojunction is designed and constructed. The architecture effectively promotes charge transfer across multiple heterointerfaces (metal/semiconductor interface, semiconductor/semiconductor interface), enabling highly sensitive and selective detection of volatile organic compounds, particularly triethylamine. The MXene@TiO 2 /ZnIn 2 S 4 ternary integrated heterojunction exhibits a high response value of ∼48 (R a /R g ) toward 100 ppm triethylamine at 300 °C, along with excellent selectivity, fast response/recovery, low limit of detection (697.2 ppb), remarkable humidity tolerance and long-term stability over 110 days. It is found the efficient multi-interface charge transport channel and enhanced gas adsorption/oxidation characteristics of the MXene@TiO 2 /ZnIn 2 S 4 ternary integrated heterojunction contribute to the excellent gas sensing performance. Moreover, the construction of sandwich-like 2D/0D/2D hierarchical open structure not only greatly promotes the diffusion of gas molecules, but also enhances the stability of pristine MXene. This work not only offers a novel strategy to enhance the performance of MXene-based gas sensing materials, but also provides significant insight into charge transport mechanisms at muti-interfaces in resistive-type gas sensors.
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JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Jinlong Li,Weiqi Zhang,Qiang Ma,Qian Xu,Olivia Barron,Khadijeh Hooshyari,Huaneng Su
Catalyst layer (CL) is the key factor of affecting the performance of proton exchange membrane fuel cells (PEMFCs). Herein, a facile and universal strategy is proposed to in situ grow Pt nanowires (Pt-NWs) on a dual microporous layer (MPL) as a novel CL for PEMFCs application . The dual MPL is composed of hydrophobic layer and hydrophilic layer, where the former facilitates mass transport and the latter favors the in-situ growth of Pt-NWs. During the whole preparation, only formic acid is used as reducing agent, no surfactants or templates are involved. The as-prepared Pt-NWs are uniformly grown on the surface of carbon particles to form a unique CL. The effect of dual MPL structure on PEMFCs performance is investigated, by which an optimal carbon powder content ratio (4:1) between hydrophobic layer and hydrophilic layer is determined. The single cell tests reveal that the Pt-specific power of the resultant MEA with 0.108 mg cm −2 Pt-NWs is up to 7.23 W mg −1 , about twice higher than that for commercial Pt/C MEA with 0.2 mg cm −2 Pt loading. Furthermore, the resulted GDE shows enhanced durability compared to commercial one, indicating the good potential of in-situ prepared Pt-NWs electrode for practical PEMFC applications.
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ACS ES&T Engineering
·
2026
·
IF 6.3
Rihong Xiao,Yili Zhang,Wei Yang,Daorong Sun,Changxin Luo,Xiangzheng Cui,Zhuo Xiong,Junying Zhang,Yongchun Zhao
Modified magnetospheres (MAG) as a regenerable adsorbent offer a promising alternative to conventional activated carbon injection (ACI) for mercury removal from flue gas. However, large-scale application faces challenges in achieving uniform flue gas dispersion and in high-value recovery of desorbed mercury vapor from spent MAG rich in mercury. In this study, a dual strategy combining swirl injection and value-added HgSe recovery was developed. The swirl injection model was validated at a 315 MW coal-fired power plant, reducing mercury in flue gas to 0.035 μg/m3, with swirl pressure identified as a key factor. An in situ selenium-based recovery agent (I–Se/SiO2) selectively stabilized desorbed Hg0, and DFT calculations indicated that it had significantly higher selectivity toward Hg0 than HgCl2 under flue gas conditions. Continuous field operation achieved 100% mercury recovery as pure HgSe (99.97%) with superior optical properties. Economic analysis showed that system investment and operating costs were only 32% and 19% of those for ACI, with a payback period under one year. This work establishes a new paradigm integrating end-of-pipe mercury abatement with resource recovery in coal-fired power plants.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·124054
·
IF 7.5
Yuhan Guo,Zebiao Jiang,Yu Zheng,Bohan Xiao,Yunxia Zhao
This study evaluates the CO₂ capture performance and multiscale mechanisms of three tertiary amine–promoter blends: DEEA + PZ, DMEA + PZ, and DEEA + AMP. Spectroscopic characterization at 12 vol% CO₂ identified dominant reaction pathways, while cyclic performance was evaluated under simulated gas-fired power plant flue gas conditions (4 vol% CO₂, 95 °C regeneration). DMEA + PZ achieves a cyclic working capacity of 8.49 g CO₂/kg solvent—1.92 times that of the 30 wt% MEA benchmark—with a 48% reduction in relative regeneration energy consumption. In situ Raman and quantitative ¹H qNMR analyses show that all three systems operate predominantly via the bicarbonate pathway, with the PZ-carbamate decomposition rate considerably higher for DMEA + PZ (∼22%) than for DEEA + PZ (∼17%). AMP forms no detectable carbamate, relying exclusively on the bicarbonate pathway and exhibiting a discernible solvent volatilization trend. DFT calculations reveal that the stronger basicity of DEEA, arising from the inductive effect of its ethyl groups, yields higher absorption capacity but greater regeneration energy, whereas the narrower HOMO–LUMO gap of PZ enables rapid nucleophilic kinetics and the steric shielding of AMP precludes stable carbamate formation. Classical MD simulations show that compact PZ diffuses considerably faster than the sterically encumbered tertiary amines, while AMP-containing systems exhibit restricted diffusion; RDF analyses indicate steric shielding between the N centers of the main amine and promoter, with –OH-mediated hydrogen-bonding networks providing potential proton relay pathways. These insights offer a theoretical foundation for designing blended amine solvents for low-partial-pressure, waste-heat-driven CCUS applications.
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ADVANCED MATERIALS
·
2026
·
IF 29.1
Quan Gao,Kexin Tan,Jiannan Qi,Yudong Li,Jiaxiao Wang,Guanjie Wang,Sooncheol Kwon,Qianhui Wei,Feng Wei,Zhongwu Wang,Yongxu Hu,Xiaosong Chen,Liqiang Li,Wenping Hu
Flexible gas sensors based on organic semiconductors (OSCs) show great promise for diverse applications, yet their practical application is hindered by the limited operational and shelf stability of OSC-based gas sensors over a wide temperature range. Herein, we developed a universal grain boundary pinning strategy to cooperatively optimize the aggregate state stability, sensitivity, and selectivity of the ultrathin OSC film. By incorporating multi-functional Au nanoclusters into the OSC layer, the thermally activated molecular motion and grain boundary migration can be inhibited by the cooperative effect of strain-balancing and dipole–π interactions. Consequently, the NH 3 sensor based on 5 nm ultrathin film exhibits record stability over an extended shelf period (tested shelf life of one-year, theoretical shelf life of 14.8 years) and across a wide temperature range (RT-100°C on polymer substrate, RT-180°C on SiO 2 substrate). The grain boundary pinning strategy is demonstrated to be universal across multiple OSC systems, underscoring its potential to enable robust, high-performance flexible gas sensors for widespread commercialization.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Shi-Kai Shen,Hui-Ye Jiang,Yu-Ying Xin,Qi Guo,Ya-Nan Li,Zhao-Peng Deng,Ying-Ming Xu,Xin-Lei Cui,Li-Hua Huo,Shan Gao
The development of MoO 3 -based sensors for rapid and sensitive detection of chemical warfare agent analogues (2-chloroethyl ethyl sulfide, 2-CEES) remains a great challenging due to the lack of specific report. Herein, discarded wheat straw (WS) was selected as self-sacrificial template. Through simple impregnation with ammonium molybdate solution followed by pyrolysis at 550 o C in air atmosphere, the 550 o C calcined MoO 3 (labeled as MoO 3 -550) biomimetic tubes formed by nanosheet cross-linking were successfully obtained. It exhibits three-level mesoporous distribution, relatively narrow bandgap and large specific surface area. The presence of low valence Mo(V) facilitates the formation of abundant oxygen vacancy (V O ) defects. The synergistic effect of these structural advantages promotes the rapid gas molecule migration and increases the content of reactive oxygen species at the surface. Consequently, the as-prepared MoO 3 semiconductor achieves rapid and selective detection of 2-CEES vapor at relatively low power consumption for the first time. At a low operating temperature of 133 o C, the MoO 3 -550 sensor exhibits a response value of 72.5 to 50 ppm 2-CEES vapor, which is 3.5 times higher than 650 o C calcined MoO 3 (labeled as MoO 3 -650) and 2.5 times higher than template-free MoO 3 (labeled as MoO 3 -TF). This performance also surpasses all previously reported resistive 2-CEES sensors. It also exhibits fast response rate, ppb level detection limit, reversible reproducibility and good stability. Furthermore, multiple techniques were employed to analyze its sensing mechanism toward trace amounts of 2-CEES.
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WATER RESEARCH
·
2026
·
IF 12.8
Haonan Liu,Keyu Wang,Yiqian Liu,Qiang Yang
Produced water from gas fields, under conditions of high emulsification, elevated salinity, and the coexistence of various interfacial active components, exhibits pronounced stability and poses significant challenges for treatment. Conventional physical separation techniques often fail to achieve effective demulsification and deep oil removal. Addressing this engineering bottleneck, the present study focuses on produced water from the western Sichuan gas field, conducting a systematic investigation into demulsification regulation, interfacial destabilization mechanisms, and the validation of particle coalescence-based oil removal processes.Initially, by examining the dynamic evolution of zeta potential, turbidity, interfacial tension, droplet size, and ion concentration during the alkaline conditioning of produced water, the study employs DLVO theory to quantitatively analyze the interaction potential between oil droplets and applies Gibbs adsorption theory to characterize interfacial film rigidity. The findings confirm that the rapid destabilization process is triggered by the precipitation and extraction of divalent ions, revealing a key mechanism whereby Ca²⁺ and Mg²⁺ enhance interfacial film rigidity through cross-linking with surfactants, thereby significantly reinforcing emulsion stability.Building on these insights, a synergistic purification strategy—“alkaline precipitation-induced destabilization coupled with randomly packed particle coalescence”—is proposed. Subsequent coalescence experiments demonstrate that an appropriately structured fiber bed can markedly reduce petroleum pollutant concentrations in the destabilized produced water. Pilot-scale validation shows that, with a bed thickness of 120 cm, pH maintained between 10.4 and 11, and a treatment capacity of 2–5 m³/h, the effluent oil content can be reduced to below 1 mg/L. The proposed integrated process offers notable advantages in reducing chemical dependency and enhancing system compactness, providing a scalable engineering solution for the efficient purification of highly emulsified gas field produced water.
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LANGMUIR
·
2025
·
IF 3.9
Yuchuan Qian,Tianhong Xu,Haiyuan Yao,Guangchun Song,Yuxing Li,Wuchang Wang,Xinran Yu,Zheng Xu
Flow blockage caused by hydrate deposition in deep-water–oil and gas pipelines seriously affects the safety of energy transmission. The structural stability of hydrates has a direct influence on the assessment of the development of hydrate deposition in pipelines, and the situation under hydrate-inhibitor-containing conditions may be more complicated. The effect of inhibitors on the structural stability of hydrate deposition under the action of flow scouring has not yet been clarified. The present study was based on the process of hydrate formation transformation under kinetic inhibitor-containing pectin conditions. The “concentration effect” of the pectin system causes the hydrate particle morphology to change from acicular to punctate. For the first time, the evolution model of microscopic fracture in the hydrate bed under the action of flow scouring in the high-mass transfer region was clarified. It was determined by microscopic dynamic data that there was reformation and filling of hydrate particles between the flow scouring fracture as well as growth and extension behavior, and a chain initiation-induced nucleation effect of hydrate particles was proposed. It was further found that pectin weakened the cohesion of hydrate particles, but when the pectin concentration was 0.25 wt %, there was an abnormal increase in cohesion. Enhanced mass transfer due to structural destabilization of the hydrate layer may be responsible for the continued formation and transformation of pectin system hydrates at low shear rates. This study shows for the first time the correlation between inhibitor concentration and hydrate conversion from the perspective of structural stability of hydrate beds and provides a theoretical basis for the engineering application of green inhibitors.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Ziyang Chen,Long Liang,Huan Yuan,Huan Liu,Peng Wu,Mingli Fu,Junliang Wu,Peirong Chen,Yongcai Qiu,Daiqi Ye,Limin Chen
Strong metal-support interaction (SMSI) is regarded as one of the most important concepts in heterogeneous catalysis; however, few researches are focused on SMSI regulating the support structure, properties and their roles on the catalytic performance. Herein, anatase TiO 2 {001} nanosheets pretreated in different atmosphere were used to load Pt for reverse water gas shift reaction. The Pt/N-doped TiO 2 catalysts exhibited significantly superior catalytic performance. The investigation demonstrated that defects and doped-N enhance the Pt dispersion while Pt and SMSI in turn promote defects regeneration during activation in H 2 . During reaction, surface defects enable CO 2 activation to generate active intermediates which easily decompose into CO. Furthermore, the small Pt particles and SMSI facilitate H 2 dissociative adsorption and spillover to replenish both surface defects and bulk Ti 3+ . Besides, a novel reaction route has been observed that the stable bulk Ti 3+ in N-doped TiO 2 migrate and transform to surface defects, enhancing catalytic performance.
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