CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 101
·期 3
·1591-1601
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IF 2.5
Renjie Deng,Yao Tian,Huajie Liu,Weiwei Yan
This work presents a novel heterogeneous catalytic system for the preparation of para -nitrotoluene ( p -NT) with nitrogen dioxide (NO 2 ) as a nitrating agent in the presence of oxygen (O 2 ). By applying dealuminated Hβ zeolite treated with oxalic acid (Hβ-Ox) as a catalyst, p -NT can be obtained with high conversion (90.5%) and selectivity (72.6%). In addition, it can be recycled at least five times without a significant decrease in catalytic activity. This result demonstrates that the catalyst has high efficiency, good stability, and regenerability. Meanwhile, the characteristics of pristine Hβ and different dealuminated Hβ zeolites modified with organic and inorganic acids were systematic contrastive studied using X-ray diffraction (XRD), nitrogen (N 2 ) adsorption-desorption, Fourier-transform infrared (FT-IR), scanning electron microscope (SEM), temperature-programed desorption of ammonia (NH 3 -TPD), pyridine adsorption infrared (Py-FT-IR), and solid state 27 Al nuclear magnetic resonance ( 27 Al MAS-NMR). Finally, the higher conversion and para -selectivity over Hβ-Ox also give a reasonable explanation in this paper.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Binbin Shao,Yufan Chen,Deli Wu,Chaomeng Dai,Yalei Zhang
Structural Fe(II/III) hydroxides on the shell of nano-zerovalent iron (nZVI) are reactive sites for As(III) adsorption. Well-controlled structural Fe(II) hydroxides (SFH) is prepared to serve for As(III) removal in present study. With oxygen As(III) removal by SFH occurred efficiently but the removal efficiency was greatly reduced under anoxic conditions. The mineral transformation from SFH to lepidocrocite probably contributed to the robust removal efficiency of As(III). It is found that Cu(II), Cr(VI) and NO 2 − in aqueous solution could act as oxidants and promote the mineral transformation of SFH. A more efficient As(III) removal was therefore observed without oxygen. The removal efficiency decreased in the order O 2 /SFH ≈ Cu(II)/SFH > Cr(VI)/SFH ≈ NO 2 − /SFH at near neutral pH. The removal efficiency was less dependent on the initial pH for O 2 /SFH and Cu(II)/SFH systems than Cr(VI)/SFH and NO 2 − /SFH systems. Distribution of As on solid phases was able to describe the removal mechanism of As(III), and the results showed that the mineral transformation promoted the precipitation process and inhibited outer-sphere complexation, thus leading to enhanced As removal. With Cu(II), Cr(VI) and NO 2 − , the generation of oxidants from SFH transformation drove As(III) oxidation, and contributed to total As removal.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Yumeng Liu,Jinniu Zhang,Gang Li,Jia Liu,Qingfei Liang,Hongjun Wang,Yuanyuan Zhu,Jianzhi Gao,Hongbing Lu
In 2 O 3 –ZnO nanotubes were prepared by a solvent thermal method using electrospun indium nitrate–polyvinyl pyrrolidone [In(NO 3 ) 3 –PVP] nanofibers as a sacrificial template. The sensing properties toward NO 2 of this kind of new emerging sensing material were explored. Compared with as-electrospun In 2 O 3 nanofibers, the In 2 O 3 –ZnO composite nanotubes exhibited higher responses and better selectivity to NO 2 . The response of the In 2 O 3 –ZnO nanotubes to 500 ppb NO 2 at room temperature (RT, 25 °C) under UV irradiation was as high as to 32.73, which was 3.33 times higher than that of the In 2 O 3 nanofibers. Moreover, even under a high relative humidity of 80%, the RT NO 2 response of the In 2 O 3 –ZnO composite nanotubes can still reach up to 3.50–500 ppb. The enhanced NO 2 sensing characteristics were mainly ascribed to the formation of In 2 O 3 –ZnO n–n heterojunctions , the enhanced light absorption, and the increased oxygen vacancy proportion. The results suggested that In 2 O 3 –ZnO nanotubes had good potential for the selective and sensitive detection of ppb-level NO 2 at RT.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Yunshi Liu,Rui Wang,Tong Zhang,Sen Liu,Teng Fei
The development of NO 2 gas sensors is of great importance for air quality monitoring and human health. In this work, In 2 O 3 and zeolitic imidazolate framework-8 (ZIF-8) heterostructures were synthesized and designed as efficient sensing materials for NO 2 detection. The ZIF-8 nanocrystals were uniformly deposited on In 2 O 3 nanofibers (NFs) by using a self-template strategy, where In 2 O 3 /ZnO NFs act as the source of Zn 2+ for the formation of ZIF-8 and as the template. By tuning the amount of Zn 2+ in the composite NFs, different morphologies from In 2 O 3 NFs with minimal ZIF-8 loading to an In 2 O 3 /ZIF-8 core-shell complex were obtained. The optimized In 2 O 3 /ZIF-8 NFs show a remarkably high response to 1 ppm NO 2 (R g /R a = 16.4) and enhanced humidity resistance due to the hydrophobicity of ZIF-8 in comparison with those of the pristine In 2 O 3 NF sensor (R g /R a = 4.9) at 140 °C. The gas sensing mechanism of In 2 O 3 /ZIF-8, which is based on electron transduction, surface chemistry, and the functional interface between the loaded ZIF-8 and In 2 O 3 matrix, was proposed. Additionally, the large number of pores, which were formed by the in situ conversion of ZnO grains in the matrix, ensures that all parts of the In 2 O 3 NFs are accessible to gases. This facile strategy paves the way for the design of metal oxide/MOF complex architectures with tunable metal centers for various applications, including gas sensing.
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SENSORS AND ACTUATORS A-PHYSICAL
·
2026
·
IF 5.1
Ruojin Zhang,Yuhang Du,Longyu Ren,Jiliang Yuan,Mengmeng Xie,Zhaohui Liu,Xiuze Li,Jieqiang Wang,Hongyan Xu
High-performance sensors for toxic gases have been the goal of research in the industry. In this study, In 2 O 3 nanorods were grown on ceramic tubes using a hydrothermal method, and a series of gradient annealing temperatures were set to obtain different samples through annealing in air atmosphere. Among them, In 2 O 3 annealed at 400 °C (In 2 O 3 -400) showed the highest oxygen vacancies and chemical adsorbed oxygen ratio. The gas sensing performance test demonstrated that In 2 O 3 -400 exhibited excellent sensitivity to NO 2 at room temperature, its response was 4.58 at 500 ppb and 146.58 at 50 ppm. Density functional theory (DFT) analysis was used to study the adsorption mechanism of nitrogen dioxide on pure In 2 O 3 and In 2 O 3 with V O materials, showing that the existence of oxygen vacancies enhanced the adsorption capacity of In 2 O 3 for NO 2 , and the DFT calculation results were in accordance with the experimental data. This study determined the optimal annealing process conditions, providing theoretical and experimental support for the development of high-performance room-temperature In 2 O 3 -based NO 2 gas sensing devices.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Guiting Wang,Jiahui Fan,Ying Xie,Menghan Yu,Kun Li,Xu Guo,Jingfeng Wu,Keying Shi,Kai Pan
The fabrication of high-performance gas-sensitive materials with enhanced moisture resistance is an important research topic. In this work, monodisperse Y-type CoO hierarchical nanostructures with a branch length of about 16 nm have been prepared, and then uniformly dispersed on the surface of reduced oxide graphene (rGO) by hot injection method. The composite exhibited a rapid response to NO 2 at room temperature. The optimal response was about 40–100 ppm NO 2 , the response time was 620 s to 10 ppm NO 2 and the detection limit was 0.01 ppm. It was due to the combination of more NO 2 adsorption active sites of Y-type CoO and faster carrier transfer of rGO. Even at high relative humidity (RH) conditions of 80%, the sensor still retained a high response value of about 90% of that measured at the normal RH (25%). The effective wrapping of stearate ligands inhibited the entrance of water vapor molecules, which could effectively improve the hydrophobic properties of the composite and resulted in enhanced moisture resistance. It may provide a new path for improved NO 2 detection with enhanced moisture resistance at room temperature.
研究领域:
材料科学
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纳米技术
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气体传感
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环境监测
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化学传感器
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Yongjing Guo,Hangshuo Feng,Qiuni Zhao,Juntao Mu,Qi Ran,Dongyang Li,Jian Luo,Yi Xia,Ming Hou,Li Yang,Shenghui Guo
Two-dimensional tin sulfide (SnS 2 ) shows great promise as a NO 2 gas-sensing material due to its large specific surface area and suitable band structure, yet its selectivity and detection limit remain inadequate. Herein, PdS/SnS 2 composite with PdS nanoparticle inlaid in lettuce-like structure SnS 2 was synthesized via a facile microwave-assisted method for room-temperature NO 2 detection. The optimized PdS/SnS 2 composite exhibits that the response value to 5 ppm NO 2 reached 2560% at room temperature under 50% relative humidity, which is approximately 10.7 times that of pristine SnS 2 (238%). Importantly, its experimental limit of detection (LOD) for NO 2 is as low as 800 ppt, while the theoretical LOD is below 164 ppt. Furthermore, it also shows outstanding reversibility and repeatability (RSD < 5%), and high selectivity (response ratio > 40) against interfering gases. The enhanced sensing performance is attributed to the synergistic effect of the PdS/SnS 2 heterojunction and sulfur vacancies, which promotes NO 2 gas adsorption on the material surface and electron transport inside the material. This study provides a feasible strategy for designing high-precision and ultra-trace NO 2 sensors with ppt-level detection capabilities at room temperature.
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高影响因子
POLYMER
·
2026
·
IF 5.1
Huimin Chen,Xin Li,Wenjiang Li,Chenguang Li,Qiang Li,Dabin Liu,Binbin Wang
The limited stability and insufficient reactivity of small molecules toward NO 2 limit their ability to suppress the autocatalytic degradation of nitrocellulose (NC) under harsh conditions. The integration of rigid planar with twisted Tröger's base (TB) yields a thermally stable polymer designed for dual function: inherent microporosity enables rapid NO 2 physisorption, while abundant N-sites facilitate stable in-situ chemisorption at elevated temperatures. Among them, the biphenyl-based Tröger's base (BTA-TB) exhibits excellent NO 2 uptake (BTA-TB, 909.81 m 2 g −1 , 3.06 mmol g −1 ). With 3% BTA-TB, it reduces NO 2 release by 63.4 % in titration tests and extends the methyl violet color-change time by a factor of 2.35, outperforming pyrene-based TB (PTA-TB, 1120.51 m 2 g −1 , 2.99 mmol g −1 ) and Tetrakis(4-aminophenyl)-1,4-benzenediamine TB (TABA-TB, 28.25 m 2 g −1 , 2.74 mmol g −1 ). Characterization and calculations revealed that NO 2 preferentially fixes adjacent to the aromatic ring's tertiary amine. BTA-TB's high performance is attributed to its microporous structure, large surface area, reduced π-conjugation, and lower activation energy. These findings establish a design strategy for materials that simultaneously achieve physical adsorption and stable chemical immobilization of NO 2 and other gases.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Yongjing Guo,Hangshuo Feng,Qiuni Zhao,Shenghui Guo,Renminxi Ou,Shunping Zhang,Zaihua Duan,Yi Xia,Zhen Yuan,Ming Hou,Li Yang,Huiling Tai
A sulfur vacancy-rich PdS/MoS 2 hierarchical heterostructures were synthesized via in-situ microwave-assisted method. • A dual-sensitization mechanism of synergistic enhancement of sulfur vacancy and heterojunction was proposed. • A mobile monitoring system is developed for on-site NO 2 tracking, enabling excessive NO 2 concentration warning. Developing high-selectivity and high-sensitivity nitrogen dioxide (NO 2 ) gas sensors, and explaining the complex underlying sensitization mechanisms remain critical challenges. Herein, we propose a dual-sensitization mechanism of synergistic enhancement of sulfur vacancy and heterojunction at composite interface to develop a high-performance NO 2 gas sensor at room temperature. A novel sulfur vacancy-rich palladium sulfide (PdS) nanocluster is synthesized via a microwave-assisted method, and it is further in situ decorated on molybdenum disulfide (MoS 2 ) nanoflowers to construct hierarchical heterostructure. The high selectivity of PdS/MoS 2 gas sensor is verified via experiment and density functional theory calculation. The PdS/MoS 2 composite system shows the highest adsorption energy (−1.89 eV) to NO 2 among various interfering gases, which further decreases to −2.11 eV after introducing sulfur vacancies. Meanwhile, the proposed dual-sensitization mechanism is based on “targeted electron-reflux” effect resulting from the synergistic action of sulfur vacancies and the p-p heterojunction, which modulates the interfacial carrier migration behaviors. Furthermore, a mobile NO 2 monitoring system is developed for on-site NO 2 tracking, which is equipped with the PdS/MoS 2 gas sensor, universal serial bus module, and smart phone, enabling real-time monitoring and excessive NO 2 concentration warning. This work proposes a research approach for complicated gas sensing mechanism, and provides an avenue for portable and intelligent gas detection. Download: Download high-res image (162KB) Download: Download full-size image
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Fuqiang Zhao,Zhuangzhuang Ma,Peijin Zou,Jiale Zhang,Ziyao Wei,Lichao Jia
In complex practical environments, gas sensors with exceptional anti-interference capabilities are highly desirable. Nevertheless, developing metal oxide-based NO 2 gas sensors that maintain excellent humidity resistance at relatively low temperatures remains a significant challenge. In this work, Metal-organic framework-derived In 2 O 3 @MoS 2 heterojunctions were successfully fabricated, which demonstrate remarkable NO 2 sensing performance characterized by low operating temperature, high selectivity, and outstanding humidity tolerance. Significantly, at near room temperature, the sensor demonstrates negligible response fluctuation of only 1.03 % to 10 ppm NO 2 across a wide relative humidity (RH) range of 15 %-85 %. Even at 65 % RH conditions, it still achieves a low detection limitation of 50 ppb. Further analysis reveals that edge-terminated unsaturated sulfur (S) atoms are the key factor for the enhanced sensing performance. Both porous strueture and enhanced charge transfer are also conducive to the enhancement. These findings highlight the potential of In 2 O 3 @MoS 2 -based gas sensor as promising candidates for reliable NO 2 detection in high-humidity environments.
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高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 15
·155505
·
IF 3.874
Shengliang Zheng,Jianyong Sun,Juanyuan Hao,Quan Sun,Peng Wan,Yue Li,Xin Zhou,Ye Yuan,Xu Zhang,You Wang
Ever-increasing concerns over air quality and the newly emerged internet of things (IoT) for future environmental monitoring are stimulating the development of ultrasensitive room-temperature gas sensors, especially for nitrogen dioxide (NO2), one of the most harmful air pollution species released round-the-clock from power plants and vehicle exhausts. Herein, tin dioxide nanorods/ethylenediamine-modified reduced graphene oxide (SnO2/EDA-rGO) heterojunctions with selective adsorption and electronic structure modulation were engineered for highly sensitive and selective detection of NO2 at room temperature. The modified EDA groups not only enable selective adsorption to significantly enrich NO2 molecules around the interface but also realize a favorable modulation of SnO2/EDA-rGO electronic structure by increasing the Fermi level of rGO, through which the sensing performance of NO2 is synergistically enhanced. The response of the SnO2/EDA-rGO sensor toward 1 ppm NO2 reaches 282%, which exceeds the corresponding SnO2/rGO sensor by a factor of 2.8. It also exhibits a low detection limit down to 100 ppb, enhanced selectivity, and rapid response/recovery kinetics. This approach to designing a novel heterojunction with significantly enhanced chemical and electric effects may shed light on the future engineering of gas-sensing materials.
研究领域:
材料科学
·
环境科学
·
化学传感器
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高影响因子
TOPICS IN CATALYSIS
·
2026
·
IF 3.7
Wu Jundao,Huang Zeai,Zhang Fan,Liu Jiayi,He Yi,Hu Wei,Tang Xiao,Zairov Rustem,Sinyashin Oleg G.
The substantial presence of nitrogen oxides (NO and NO 2 ) in outdoor environments detrimentally impacts natural ecosystems and exerts significant influence on urban climates. Conventional NO x treatment methods frequently suffer from challenges such as harsh reaction conditions and high energy consumption. Consequently, the development of advanced photocatalytic systems to efficiently degrade NO x while minimizing the formation of toxic byproducts represents a critical challenge in environmental catalysis. In this study, a novel ternary composite material (5% Mo-CN/InP-NBOC) was constructed via hydrothermal synthesis and surface modification strategies, achieving 42% NO oxidation efficiency under visible light irradiation with a mere 0.9% NO 2 generation rate. This performance demonstrates efficient photocatalytic NO oxidation while effectively suppressing NO 2 production. Systematic characterization techniques, including XRD, TEM, and XPS, confirmed the successful integration of InP quantum dots (5–10 nm) and amorphous Mo-CN onto NBOC nanosheets, forming an intimate heterojunction structure. PL and ESR analyses revealed that Mo-CN enhances charge carrier separation and governs the NO oxidation process through the activation of dual free radical pathways (⋅O 2 − and ⋅OH). This work establishes a “quantum dot-primary catalyst-cocatalyst” ternary collaborative design paradigm, providing experimental evidence and theoretical models to address the challenges of synergistic optimization among activity, selectivity, and stability in photocatalytic NO x treatment.
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