ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Jingwen Qian,Mingyi Yu,Zheng Lian,Shule Zhang,Qin Zhong
An innovative strategy in wet flue gas denitration technology was proposed to control nitrogen oxide emissions from cement kiln. Here the use of tetrabutylammonium bromide (TBAB) as an additive improved the absorption and utilization efficiency of sulfite absorbents for NO2. Compared with the sulfite solution, the stability time and absorption efficiency of adding TBAB were increased from 25 to 76 min and from 91.2 to 98.4%, respectively. Continuous absorption for 480 min indicated the feasibility of TBAB for repeated use. Moreover, we propose an antioxidant mechanism, including the capture of SO3•– by TBA+, and the reduction of SO3•– by Br–. The successive steps kept the sulfite from the cyclic depletion of the radical chain reaction of “Generate SO3•–-Introducing O2–Consuming SO32–” due to O2. A new application of TBAB in free radical trapping and antioxidant is given. Furthermore, a kinetic model describing the macroscopic absorption rate was developed based on different operating conditions.
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PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 8
·087505
·
IF 4.386
Lin Yang,Chunping Wu,Yiran Zhang,Bang Xiao,Anqi Jiao,Ke Li,Ting Chen,Reggie Zhan,He Lin
A mixed potential ammonia sensor using In2O3 sensing electrode was prepared, and its sensing performance was enhanced by adjusting particle size with calcination heating rate as well as the utilization of NiCo2O4 reference electrode. It was found that the sensor with a calcination heating rate of 2 °C min−1 had the best performance, with a sensitivity of −61.27 mV decade−1 at 525 °C, and the TEM results showed that the average particle size was 70.36 nm. Furthermore, the sensor exhibited good stability against oxygen concentration fluctuation. The results also indicated that the mixed potential has a linear relationship with the logarithm of NH3 concentration, suggesting that the ammonia sensors in this study conform to the mixed potential theory. To address the issue that most ammonia sensors are susceptible to NO2 interference, NiCo2O4 was used as reference electrode to replace the Pt reference electrode, which could greatly offset the response of NO2 and improve the sensors selectivity. In summary, the developed In2O3/YSZ/NiCo2O4 sensor exhibited a great potential for NH3 monitoring in SCR systems.
研究领域:
材料科学
·
电化学
·
环境监测
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RARE METALS
·
2026
·Vol. 45
·期 7
·e70439
·
IF 12.1
Jinyong Hu,Songming Dou,Xinyao Liu,Bohao Liu,Xiongxiong Xue,Yong Zhang
en This link goes to a English section zh This link goes to a Chinese section Light-activated gas sensors hold significant potential in environmental monitoring and smart Internet of Things (IoT) owing to their advantage in room temperature operation. Nevertheless, due to a narrow light absorption range, high photocarrier recombination rate, and weak redox activity of the sensing material, the performance enhancement of the current light-activated gas sensors is still impeded. Herein, a full-spectrum solar light–activated gas sensor is designed based on W 18 O 49 /Ag 2 S nanocomposites with an S-scheme heterostructure for the highly sensitive detection of NO 2 at room temperature. Under solar light illumination, the gas sensor exhibits a high response of 430.84% to 1 ppm NO 2 , which is over 11 times higher than that based on pristine W 18 O 49 or Ag 2 S components. Moreover, the sensor demonstrates excellent repeatability fast response/recovery times (5/3 s), low limit of detection (50 ppb), high selectivity, and satisfactory long-term stability. The enhanced sensing performance might arise from the broadened light-harvesting capability and the unique charge carrier transfer mechanism in the S-scheme heterostructure. A Bluetooth-enabled portable monitoring system is further developed to achieve real-time NO 2 monitoring and wireless visualization. This work provides theoretical insights and experimental validation for the effectiveness of S-scheme heterostructure in enhancing room-temperature gas-sensing performance, demonstrating the prospective application potential for IoT-related environmental monitoring. 摘要 en This link goes to a English section zh This link goes to a Chinese section 光激活气体传感器因其室温工作的优势 , 在环境监测和智能物联网 领域具有重要潜力。然而 , 由于传感材料的光吸收范围窄、光生载流子复合速率高以及氧化还原活性较弱 , 目前光激活气体传感器的性能提升仍受到阻碍。本研究设计了一种基于W 18 O 49 /Ag 2 S纳米复合材料的全光谱太阳光激活气体传感器 , 该材料具有S型异质结构 , 可在室温下高灵敏检测NO 2 。在太阳光照射下 , 该气体传感器对1 ppm NO 2 的响应高达430.84% , 是纯W 18 O 49 或Ag 2 S组分的11倍以上。此外 , 该传感器展现出优异的可重复性、快速的响应/恢复时间 ( 5/3 s ) 、低检测限 ( 50 ppb ) 、高选择性以及令人满意的长期稳定性。 理论分析表明传感性能的增益源于S型异质结构中拓宽的光捕获能力和独特的载流子传输机制。在此基础上, 进一步开发了一套蓝牙便携式监测系统 , 实现了NO 2 的实时监测和无线可视化。本研究为S型异质结构有效增强气体传感性能提供了理论指导 和实验验证 , 为发展面向物联网应用的高灵敏室温气体传感器提供了重要技术支撑。
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Jiajia Zheng,Mengmeng Gao,Sitong Feng,Zuorong Huang,Jiusheng Cai,Jing He,Lei Wu,Xishuang Liang,Qi Guo,Yongsen Yu,Fengmin Liu,Geyu Lu
An NO 2 fiber-optic sensor with integrated humidity compensation functionality was proposed. • Excellent NO 2 detection performance with a detection limit as low as 10 ppb. • SnO 2 /MoS 2 composite significantly enhances sensitivity. This study proposes an evanescent wave fiber-optic sensor based on an SMF-CLF-TCF-CLF-SMF interferometric structure and a SnO 2 /MoS 2 composite sensitive film, which responds to NO 2 concentration and environmental humidity through changes in transmitted light intensity and interference wavelength shift, respectively, exhibiting dual-parameter differential spectral response characteristics. The structure utilizes a coreless fiber for mode conversion and employs a Thin-core Fiber as the region for evanescent field excitation and sensitive material coating. SnO 2 and MoS 2 nanomaterials were synthesized via hydrothermal methods, and SnO 2 /MoS 2 composites with varying MoS 2 loading ratios were prepared using ultrasonic mixing. Under conditions of 25 ℃ and 20% RH, the SnO 2 /1.0 wt% MoS 2 sensor demonstrated optimal overall NO 2 sensing performance: achieving a sensitivity of 2.26 dB/dec over the 10–5000 ppb range—approximately 9 times higher than that of pure SnO 2 sensors—with a minimum detectable concentration of 10 ppb, response and recovery times of approximately 16 s and 12 s, respectively, and excellent long-term stability. Humidity experiments were independently conducted at 25 ℃; as relative humidity increased from 20% to 80%, the interference spectrum continuously shifted toward shorter wavelengths, reaching a maximum wavelength shift of 16.45 nm. Experimental results indicate that changes in NO 2 concentration primarily manifest as variations in transmitted light intensity, whereas humidity changes mainly result in shifts in the interference wavelength. This research provides an experimental foundation for high-sensitivity, ppb-level NO 2 fiber-optic detection at room temperature and dual-parameter sensing of both NO 2 and humidity. Download: Download high-res image (179KB) Download: Download full-size image
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 7.7
Yan Jiang,Yuying Xin,Hui Zhao,Xianfa Zhang,Ping Wang,Rui Gao,Yingming Xu,Shan Gao,Xiaoli Cheng,Lihua Huo
The reasonable design and preparation of high-performance sensing materials for detecting NO 2 is of importance to environmental conservation and public health. Herein, porous Zn-doped In 2 O 3 microtubes were fabricated by simple Zn(NO 3 ) 2 solution etching of In-MOF microrods, followed by calcination at 500 ℃ in air. The experiment has confirmed that appropriate amount of Zn introduced into In 2 O 3 can optimize electronic structure, increase the number of oxygen vacancy and efficiently improve NO 2 sensing property. In particular, compared with pristine In 2 O 3 , Zn-In 2 O 3 sensor exhibits excellent selectivity, high response, fast recovery speed (32 s) and lower limit of detection (LOD, 20 ppb) at room temperature. Meanwhile, the Zn-In 2 O 3 sensor also presents outstanding reproducibility, stability and humidity resistance. The excellent gas sensing property is traced to the construction of the hollow and porous structure and the synergistic optimization of Zn doping. This endeavor yields a simple strategy for the design of high-property gas sensing materials.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Yafei Guo,Changhai Li,Shouxiang Lu,Chuanwen Zhao
K 2 CO 3 supported on activated carbon (K 2 CO 3 /AC) shows promise as a potential candidate for removing low-concentration CO 2 from environmental control and life support systems (ECLSS). However, K 2 CO 3 /AC would suffer a decreased CO 2 sorption capacity due to sorbent deactivation in acid impurities such as SO 2 and NO 2 . To solve this problem, water vapor pretreatment, KOH addition and polyethyleneimine (PEI) modification were proposed as efficacious means for improving its CO 2 sorption capacity and mitigating the sorbent deactivation in these acid impurities. CO 2 sorption performances of the pretreated and modified sorbents were evaluated in a fixed-bed reactor under simulated ECLSS conditions of 20 °C, 1.0% CO 2 , 2.0% H 2 O, 30 ppm SO 2 , 20 ppm NO 2 and balanced N 2 . The mechanisms for sorbent deactivation inhibition by water vapor pretreatment, KOH addition and PEI modification were revealed by N 2 adsorption-desorption, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and Fourier transform infrared spectroscopy (FT-IR). Effects of water vapor pretreatment duration, KOH addition and PEI loading on sorbent deactivation inhibition performances were demonstrated. Furthermore, the long-term working stabilities of the pretreated and modified sorbents in impurities were evaluated. The results will provide fundamental support on practical application of K 2 CO 3 /AC for low-concentration CO 2 removal in ECLSS.
研究领域:
环境控制与生命支持系统
·
气体吸附
·
材料化学
·
空气净化技术
·
二氧化碳捕集
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2017
·Vol. 43
·期 7
·3961-3974
·
IF 1.369
Jiao Yinchun,Zhu Man,Deng Renjie,Jian Jian,Yin Yi,You Kuiyi
With the increase in environmental awareness, developing a highly efficient and environmentally benign nitration process has very important academic and applied industrial values in the synthesis of nitro-compounds. Towards this goal, we have developed an efficient and environmentally friendly approach for solvent-free liquid phase nitration of toluene by employing NO 2 as a nitrating agent and sulfated SO 4
2− /WO 3 as a catalyst replacing traditional nitric acid–sulfuric acid under mild conditions. The results indicate that SO 4
2− /WO 3 as an effective and eco-friendly catalyst exhibits excellent catalytic activity and reusability for the nitration of toluene with NO 2 . In addition, the possible pathway for liquid phase nitration of toluene with NO 2 over sulfated SO 4
2− /WO 3 catalyst was suggested. The present method makes this nitration process safe and environmentally friendly, and has the potential to enable a sustainable production of nitro-compounds from the liquid phase nitration of aromatic hydrocarbon with NO 2 in industrial applications.
研究领域:
催化化学
·
绿色化学
·
有机合成
·
环境友好工艺
·
工业化学
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高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2021
·
IF 3.995
Chao Chen,Haijian Li,Zhao Qin,Changjian Wang,Yi Xu,Zhihua Sun,Siyu Xu,Jianhua Yi,Fengqi Zhao
Hexanitro complex K 2 Ba[Ni(NO 2 ) 6 ] was prepared via the co-precipitation method, and its composition and morphology were characterized by XRD , SEM , XPS and FT-IR techniques. The catalytic performances of K 2 Ba[Ni(NO 2 ) 6 ] for CL-20, FOX-7 and TKX-50 thermolysis were also discussed and studied by using DSC and TG-DTG-MS. After K 2 Ba[Ni(NO 2 ) 6 ] were mixed with CL-20, the activation energy ( E a ) of thermolysis reaction was increased, while the heat release was greatly improved, and the transformation from NH 3 to NO occurred. It is attributed to that the decomposition products of K 2 Ba[Ni(NO 2 ) 6 ] have strong effects on the oxidation of the radicals and the electrons transfer . Besides, the thermolysis E a of FOX-7 by addition of the K 2 Ba[Ni(NO 2 ) 6 ] was increased by 81.03 kJ mol −1 , and the heat release was greatly increased. In addition to that the two-step separate thermolysis processes of pure FOX-7 was almost replaced by a one-step exothermic reaction for the FOX-7/K 2 Ba[Ni(NO 2 ) 6 ] mixture, which was due to that Ni 2+ cations could effectively increase the activity of amino groups in the FOX-7 thermolysis process. Finally, K 2 Ba[Ni(NO 2 ) 6 ] scarcely has the thermolysis catalytic activity of TKX-50 owing to the influence of metal cations on the decomposition of the hydroxylamine . Furtherly, the characteristics of ignition and flame propagation on the three energetic mixtures were strongly correlated to their thermolysis pathway and mechanism. The comparative study on the effects of K 2 Ba[Ni(NO 2 ) 6 ] to the CL-20, FOX-7 and TKX-50 thermolysis and ignition showed that the hexanitro complex has great significance on promoting the heat release efficiency of solid propellants for future study.
研究领域:
材料科学
·
化学动力学
·
含能材料
·
催化化学
·
热分析
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jing Hu,Chenming Yin,Shouxi Xu,Miao Cheng,Tao Wei,Qianqian Liu,Wanfei Li,Yun Ling,Yafei Zhang,Bo Liu
Highly-sensitive gas sensors operating at room temperature (RT) have been pursued by researchers due to their high security, energy saving and long-term stability. Herein, N-doped carbon nanosheets-incorporated zinc oxide (NCZ) was synthesized via solution calcination combined with hydrothermal method and utilized for ppb level detection of NO 2 at RT. Intriguingly, the construction of N-doped carbon nanosheets was accompanied by generation of ZnO nanoparticles, and then be transferred into mesoporous nanoplates. The as-synthesized NCZ(120)-300 nanocomposites demonstrated high sensitivity to 3 ppm NO 2 (|R g- R 0 |/R 0 =∼28.2), along with fast response/recovery (60 s/129 s) speed, excellent selectivity and cyclic stability. In particular, the morphology transition of ZnO greatly enhanced the RT NO 2 sensing performance of the as-prepared sensor. Meanwhile, the white light illumination further ameliorated the sensor’s properties involving ∼ 2.1 times enhancement of sensitivity and shorter recovery process (accelerated from 563 s to 129 s). These enhancements are ascribed to the heterostructure between ZnO nanoplates and N-doped carbon nanosheets, and the modulation of electron structure by photo-generated electron-hole pairs. In addition, the 2D N-doped carbon nanosheets and mesoporous ZnO nanoplates offer numerous active adsorption-sites, which improved the surface chemical activity of NCZ(120)-300.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Shanshan Shang,Chao Yang,Yuanmeng Tian,Zeyu Tao,Mallory Smith,Hongyan Zhang,Lin Zhang,Liangchun Li,Qinfen Gu,Hong-Cai Zhou,Yong Sik Ok,Jin Shang
Selective adsorption using porous materials is a promising approach to removing ambient nitrogen dioxide (NO 2 ). However, the highly reactive nature of NO 2 and the often-associated release of nitric oxide (NO) render a formidable challenge in developing effective and stable adsorbents. Here, we designed multivariate porphyrin-based metal–organic frameworks (MTV-PMOFs Al-PMOF(Ni x Co y )) featuring atomically dispersed Ni/Co dual-metal centers in the porphyrin ring as active adsorption sites, as robust adsorbents capable of synergistically boosting NO 2 adsorption capability and retaining the evolved NO. The introduction of the Ni/Co dual-metal sites in MTV-PMOFs greatly enhanced the NO x adsorption performance. Under dry conditions, Al-PMOF(Ni 1 Co 1 ) exhibited a NO 2 adsorption capacity of 3.66 mmol/g (100 ppm NO 2 in feed), among the highest under similar conditions, a high NO retention ability, and good regenrability (85%). Under wet conditions, its NO 2 removal capacity was further elevated by more than 50% (5.65 mmol/g). Moreover, the Ni/Co ratio in MTV-PMOFs dictates a structure–property relationship between the released amount of NO and adsorbed capacity of NO 2 . Such a corporative NO 2 and NO adsorption was for the first time established in MOFs. The material stability and potential economic value were also investigated to demonstrate the applicability of MTV-PMOFs as NO 2 adsorbents. This work provides new perspectives for the development of adsorption-based technology for mitigating ambient NO 2 pollution and managing other corrosive and toxic gases.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2020
·
IF 6.146
Pengfei Zhu,Xiaohe Yin,Xinhua Gao,Guohui Dong,Jingkun Xu,Chuanyi Wang
The controlled introduction of oxygen vacancies (OVs) in photocatalysts has been demonstrated to be an efficient approach for improving the separation of photogenerated charge carriers, and thus, for enhancing the photocatalytic performance of photocatalysts. In this study, a two-step calcination method where ZIF-8 was used as the precursor was explored for the synthesis of ZIF-8-derived ZnO nanoparticles with gradient distribution of OVs. Electron paramagnetic resonance measurements indicated that the concentration of OVs in the samples depended on the temperature treatment process. Ultraviolet–visible spectra supported that the two-step calcined samples presented excellent light-harvesting ability in the ultraviolet-to-visible light range. Moreover, it was determined that the two-step calcined samples presented superior photocatalytic performance for the removal of NO , and inhibited the generation of NO 2 . These properties could be attributed to the contribution of the OVs present in the two-step calcined samples to their photocatalytic performance. The electrons confined by the OVs could be transferred to O 2 to generate superoxide radicals, which could oxidize NO to the final product, nitrate. In particular, the NO removal efficiency of Z 350-400 (which was a sample first calcined at 350 °C for 2 h, then at 400 °C for 1 h) was 1.5 and 4.6 times higher than that of Z 400 (which was one-step directly calcined at 400 °C) and commercial ZnO, respectively. These findings suggested that OV-containing metal oxides that derived from metal-organic framework materials hold great promise as highly efficient photocatalysts for the removal of NO.
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ACS Sensors
·
2021
·
IF 7.711
Qiuni Zhao,Deming Sun,Si Wang,Zaihua Duan,Zhen Yuan,Guangfen Wei,Jian-Long Xu,Huiling Tai,Yadong Jiang
Titanium carbide (Ti3C2Tx) with a distinctive structure, abundant surface chemical groups, and good electrical conductivity has shown great potential in fabricating superior gas sensors, but several challenges, such as low response kinetics, poor reversibility, and serious baseline drift, still remain. In this work, γ-poly(l-glutamic acid) (γ-PGA) with a blocking effect is exploited to modify Ti3C2Tx, thereby stimulating the positive response behavior of Ti3C2Tx and improving its gas sensing performance. On account of the unique synergetic interaction between Ti3C2Tx and γ-PGA, the response of the flexible Ti3C2Tx/γ-PGA gas sensor to 50 ppm NO2has been improved to a large extent (average 1127.3%), which is 85 times that of Ti3C2Tx (only 13.2%). Moreover, the as-fabricated Ti3C2Tx/γ-PGA sensor not only exhibits a shorter response/recovery time (average 43.4/3 s) compared with the Ti3C2Tx-based sensor (∼18.5/18.3 min) but also shows good reversibility and repeatability (relative standard deviation (RSD) <1%) at room temperature within 50% relative humidity (RH). The improved gas sensing properties of the Ti3C2Tx/γ-PGA sensor can be attributed to the enhancement of effective adsorption and the blocking effect assisted by water molecules. Furthermore, the gas sensing response of the Ti3C2Tx/γ-PGA sensor is studied at different RHs, and humidity compensation of the sensor is carried out using the multiple regression method. This work demonstrates a novel strategy to enhance the gas sensing properties of Ti3C2Tx by γ-PGA modification and provides a new way to realize highly responsive gas detection at room temperature.
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高影响因子
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