Frontiers of Chemical Science and Engineering
·
2017
·Vol. 11
·期 2
·205-210
·
IF 1.712
Zhou Shenghui,You Kuiyi,Yi Zhengming,Liu Pingle,Luo He’an
Metal salts with highly electronegative cations have been used to effectively catalyze the liquid-phase nitration of benzene by NO 2 to nitrobenzene under solvent-free conditions. Several salts including FeCl 3 , ZrCl 4 , AlCl 3 , CuCl 2 , NiCl 2 , ZnCl 2 , MnCl 2 , Fe(NO 3 ) 3 ∙9H 2 O, Bi (NO 3 ) 3 ∙5H 2 O, Zr(NO 3 ) 4 ∙5H 2 O, Cu(NO 3 ) 2 ∙6H 2 O, Ni (NO 3 ) 2 ∙6H 2 O, Zn(NO 3 ) 2 ∙6H 2 O, Fe 2 (SO 4 ) 3 , and CuSO 4 were examined and anhydrous FeCl 3 exhibited the best catalytic performance under the optimal reaction conditions. The benzene conversion and selectivity to nitrobenzene were both over 99%. In addition, it was determined that the metal counterion and the presence of water hydrates in the salt affects the catalytic activity. This method is simple and efficient and may have potential industrial application prospects.
研究领域:
化学工程
·
催化化学
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高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Zhao Zhang,Song Zhou,Hongyuan Xi,Majed Shreka
A high nitrate concentration in scrubber water is a major factor that restricts ship applications of NOx wet absorption technology. In this paper, an absorption system (Na2SO3/NaHSO3) that can effectively improve NO2 absorption and reduce the concentrations of nitrate and nitrite was studied. Several factors that affect the NOx absorption efficiency and the concentrations of nitrate and nitrite were investigated in a bubble reactor by using Na2SO3 and Na2SO3/NaHSO3. In addition, the reaction mechanism for the process of NO2 absorption was deduced. The results illustrate that increases in S(IV) concentration and initial NO2 concentration could enhance the NOx absorption efficiency while increases in the NO/NO2 ratio and SO2 concentration decreased the NOx absorption efficiency. Moreover, the maximum NOx absorption efficiency was 97.8% at 0.15 mol/L S(IV) and 1400 ppm of NO2 when using the Na2SO3/NaHSO3 absorption system. The S(IV) concentration was the main factor affecting the NOx absorption efficiency and the concentrations of nitrate and nitrite. Increasing the SO2 concentration slightly affected the NOx absorption efficiency but was beneficial for decreasing the concentrations of nitrate and nitrite. The performance of the Na2SO3/NaHSO3 absorption system was better than that of Na2SO3 in the presence of oxygen. Furthermore, the minimum concentrations of nitrate and nitrite were 13.5 and 0 mg/L, respectively, in the Na2SO3/NaHSO3 absorption system for 1100 ppm of NO2 and 0.3 mol/L S(IV) and were much lower than current regulations for scrubber water. Finally, compared with other experimental results, the Na2SO3/NaHSO3 absorption system exhibits great potential for ship NOx wet absorption, and the addition of NaHSO3 plays a key role in decreasing the concentrations of nitrate and nitrite.
研究领域:
环境科学
·
化学工程
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高影响因子
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
·
化学传感器
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DOI
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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高影响因子
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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DOI
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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DOI
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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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Fenglin Li,Chu Cheng,Chaofan Tong,Yinliang Zhang,Rui Xu,Xiaoqing Jiang,Liangliang Tian,Jiawen Jian,Jihong Xia,Jie Zou
The use of NO 2 sensors is a significant measure for reducing NO 2 emissions from industrial plants and vehicles. The performance of these devices considerably depends on the morphology of sensing electrodes, which in turn is directly influenced by the particle size of the raw powder used for gas detection. In this study, the particle size distribution (PSD) of LaCrO 3 powder was optimized through adjustments to calcination temperature, and the influence of such optimization on the morphology of sensing electrodes was considered in the examination of sensing performance. The results indicated that the sensor (S300) fabricated with the optimally calcined powder exhibited the best performance, achieving a high sensitivity of 52.52 mV/decade and a low limit of detection of 16.5 ppb—advantages stemming from the optimized gas diffusion pathways and triple phase boundaries (TPBs) in the sensing electrodes. The sensor also exhibits excellent selectivity, repeatability, and long-term stability. Overall, the PSD-oriented method developed in this research serves as an effective strategy for designing mixed-potential sensors, showing promising applications in high-temperature exhaust gas monitoring.
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高影响因子
Food Analytical Methods
·
2022
·Vol. 16
·期 1
·71-82
·
IF 3.498
Wang Qingying,Chen Lianfang,Li Yongli,Yang Jing,Yang Rui,Yang Xiupei
In this work, a magnetic covalent organic framework (COF) named Fe 3 O 4 @TpPa-NO 2 was designed and synthesized by a solvothermal method employing 1,3,5-triformylphloroglucinol (Tp) and 2-nitro-p-phenylenediamine (Pa-NO 2 ) as the organic units. Fe 3 O 4 @TpPa-NO 2 was explored as an adsorbent for magnetic solid-phase extraction (MSPE) of four pyrethroid insecticides. Fe 3 O 4 @TpPa-NO 2 displayed excellent adsorption capacity in the adsorption test of pyrethroid insecticides. Taking bifenthrin as an example, the adsorption capacity reached 885 mg·g −1 . A sensitive method for the determination of pyrethroid pesticide residues was developed using high-performance liquid chromatography (HPLC) coupled with MSPE. The linearity of the proposed method has a correlation coefficient ( R 2 ) of 0.9992–0.9999 in the range of 15–1000 ng·mL −1 . Under optimal conditions, the limits of detection (LODs) and limits of quantification (LOQs) were 3.98–6.21 and 13.28–22.05 ng·mL −1 , respectively. Furthermore, satisfactory precision and accuracy were obtained with relative standard deviations (RSDs) of 2.58–3.42% and recoveries of 85.7–109.8%. The adsorption mechanism inferred that π-π interactions, hydrophobic interactions, and hydrogen bonding could promote the adsorption of pyrethroids. The developed MSPE-HPLC method has the advantages of rapidity, accuracy, sensitivity, recyclability, and good practical applicability.
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高影响因子
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