ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Zheng Lian,Guojun Li,Shule Zhang,Weihua Ma,Qin Zhong
An innovative strategy to control nitrogen oxide emission from flue gas was developed using the wet flue gas denitrification technology. The use of cyclodextrin (CD) as an additive facilitated NO2 absorption by the sulfite absorbent. Compared with absorption by a sulfite solution (59.12%), the instantaneous absorption efficiencies employing CD improved to 94.57%. Moreover, 48 h of continuous absorption indicated cyclic utilization of CD. The favorable role of CD was ascribed to facilitating the limiting step for the entire NO2 absorption–dissolution process which included both water solubility and gas–liquid mass transfer. Furthermore, we propose a potential mechanism of CD/sulfite mixed solution absorbing NO2, among which the favorable role of the additive is related to its amphiphilic behavior toward gas and liquid phases. Additionally, a kinetic model describing the rates of gas–liquid transfer and macro absorption was established based on various operating conditions. This model explains the absorption improvement in the kinetic aspect and provides theoretical guidance for practical applications.
研究领域:
环境科学
·
化学工程
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Inorganics
·
2026
·Vol. 14
·期 8
·203
·
IF 3.4
Jingxian Gongye,Jian Hou,Guohao Yin,Minbo Lan,Hongli Zhao
Nitrite (NO2−), a widely used food additive, may pose health risks when consumed in excess, making the development of highly sensitive, rapid, and portable detection methods of great importance. Electrochemical methods have been widely applied to NO2−detection because of their simplicity, low cost, and fast response. In this work, based upon a portable potentiostat (xenSTAT), a NO2−electrochemical sensor has been successfully developed and combined with the modification of PtCu nanospheres on flower-like Mo2C (denoted as PtCu/Mo2C) on screen-printed electrodes (SPEs). Owing to the excellent electrochemical activity and catalytic capability of PtCu/Mo2C, the proposed electrochemical sensor exhibited a wide linear range (10–1000 µM), high sensitivity (0.0229 µA µM−1) and a low detection limit (0.98 µM). Moreover, the sensor was successfully applied for detecting nitrites in sausages and milk, showing also good recovery.
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ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Zhihua Ying,Yi Zhong,Yan Liu,Wenjun Yan
Background Nitrogen dioxide (NO 2 ) is a hazardous atmospheric pollutant, driving demand for highly sensitive and reliable monitoring sensors. A significant challenge in this field is enhancing the performance of metal-oxide-based gas sensors, particularly their response and operating temperature. Current materials often exhibit insufficient sensitivity at room temperature, limiting their practical application. This work addresses the problem of developing a high-performance NO 2 gas sensor that operates effectively at room temperature. Results We present a novel WO 3 /InWO 4 heterojunction sensor that demonstrates dramatically enhanced NO 2 sensing under UV activation. The key result is a response value of 116.03 to 3 ppm NO 2 at room temperature, which is 3.55 times higher than that of a pure InWO 4 sensor. The composite sensor showed a response time of 68 s and a recovery time of 43 s, representing a slight increase and decrease, respectively, compared to the pure material. This performance is attributed to the synergistic effects of the constructed heterojunction, which promotes charge separation, alongside optimized oxygen vacancy concentration and UV light activation. The method was comprehensively validated through material characterization and gas-sensing tests, confirming that this composite structure effectively improves surface reactions with NO 2 molecules. Significance This study conclusively demonstrates that the WO 3 /InWO 4 heterojunction strategy is highly effective for NO 2 sensing. The significance lies in achieving exceptional sensor response at room temperature, providing a valuable pathway for developing low-power, high-performance gas sensing devices.
研究领域:
材料科学
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传感器技术
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无机化学
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环境监测
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半导体物理
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表面科学
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PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Jiami Ma,Zhixin Hu,Weihong Guo,Cheng Ni,Pan Li,Bosheng Chen,Songhua Chen,Jinlong Wang,Yanbing Guo
Ground−level ozone (O 3 ) pollution poses a significant threat to both ecosystem sustainability and human health. The catalytic decomposition of O 3 presents as a promising technology to address the issues of O 3 pollution. This study undertook the synthesis of various functionalized metal−organic framework (MOF) catalysts ( i.e., X-MIL-53(Fe) (X = H, NH 2 , NO 3 )) to delve into the influence of ligand functional groups on skeletal structure and catalytic efficacy, particularly focusing on unraveling the mechanism of O 3 catalytic decomposition under humid conditions. NH 2 -MIL-53(Fe) catalyst achieved complete O 3 decomposition under ambient temperature and high humidity conditions (RH=75 %), exhibiting a reaction rates (mol·m −2 ·s −1 ) 129 and 10.5 times greater than that of MIL-53(Fe) and NO 2 -MIL-53(Fe). The NH 2 group promotes electron flow within the backbone towards the hydroxyl group (OH) linked to Fe atom. In humid O 3 , H 2 O molecules augment the interaction between O 3 and NH 2 -MIL-53(Fe), and OH is converted to·O 2 − after deprotonation, promoting O 3 decomposition. Additionally, leveraging three−dimensional (3D) printing technology, a monolithic catalyst for O 3 decomposition was prepared for application. This study not only advances understanding of the mechanisms underlying O 3 decomposition but also offers practical solutions for addressing O 3 pollution at humid conditions.
研究领域:
环境科学
·
材料科学
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PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2026
·
IF 5.2
Xi Lu,Baijin Wang,Ziyang Cui,Kaicaiayi Kelimu,Lu Wang,Lijuan Wang
Enhancing gas diffusion and interfacial accessibility in organic semiconductor films is essential for achieving high-performance nitrogen dioxide (NO 2 ) sensing at low concentration levels. This study presents a strategy for enhancing the nitrogen dioxide (NO 2 ) sensing performance of α-hexathiophene (α-6T) and Copper (II) Phthalocyanine (CuPc) organic semiconductor films by introducing a porous polystyrene (PS) structure onto SiO 2 substrates by solution spin-coating. The influence of PS concentration on the morphology and gas-sensing response characteristics was investigated. At an optimal PS concentration of 7 mg/mL, the sensitivity of the sensors was enhanced, and the theoretical limit of detection (LOD) was reduced. The PS/CuPc sensor achieved a sensitivity of 270.96%/ppm and a theoretical LOD as low as 299 ppb. We attribute this performance enhancement to the PS structure increasing the specific surface area of the organic semiconductor film, thereby promoting the diffusion and desorption of gas molecules within the semiconductor film. This work provides a reliable preparation method and mechanistic insights for developing gas sensors with low detection limits.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Mingyang Gao,Bohang Zhang,Yutian Ma,Xinyuan Du,Chunxue Zhai,Zhiyong Zhang,Wu Zhao
Simultaneous monitoring of temperature and gas concentration is crucial in many practical scenarios, as these two parameters are often strongly coupled. However, conventional sensing platforms typically rely on multiple single-function sensors, increasing system complexity and limiting their applicability. In this work, we first develop a rigid multi-wall carbon nanotubes (MWCNTs)‑indium selenide (InSe) sensor with excellent dual-mode temperature and nitrogen dioxide (NO 2 ) sensing capabilities, achieving high thermal sensitivity and ppb-level gas detection. Building on this foundation, a wearable version of the sensor is fabricated, enabling robust performance under mechanical deformation. Finally, the flexible device is integrated into a compact system featuring two independent sensing channels, real-time display, and threshold-triggered alarms. This study demonstrates a simple yet powerful strategy to realize multifunctional environmental sensing with a single sensor unit and highlights its strong potential for next-generation wearable electronics and intelligent environmental monitoring.
研究领域:
材料科学
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传感器与仪器
·
可穿戴电子
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环境监测
·
纳米技术
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jinyong Hu,Jiawei Zhang,Xing Liu,Hongyu Zhang,Xiong-Xiong Xue,Yong Zhang
The efficient monitoring of toxic nitrogen dioxide (NO 2 ) reveals a great practical significance in terms of environmental protection and human health. Tin disulfide (SnS 2 ) has recently presented bright application prospects for the NO 2 detection owing to its unique physiochemical properties. Unfortunately, the pristine SnS 2 -based gas sensor suffers from inferior selectivity to NO 2 since the emerging cross-response over interfering gases (especially to NH 3 ) at room temperature. Herein, a room-temperature-operated gas-sensitive device based on Au nanoparticles decorated SnS 2 nanosheet was proposed for the highly selective detection towards NO 2 by exploiting visible-light modulation. Benefited from the electronic sensitization and chemical sensitization of Au nanoparticles, the Au/SnS 2 gas sensor presented a visibly enhanced response toward 1 ppm NO 2 compared with pristine SnS 2 gas sensor, while its selectivity to NO 2 over NH 3 only increased by 35%. Further, through effectively modulating the adsorption and reaction behavior of gas molecules by introducing visible-light excitation, the Au/SnS 2 gas sensor manifested an excellent selectivity with 130% gain in detecting 1 ppm NO 2 at room temperature, endowed the robust repeatability and reliable long-term stability. This work thus demonstrates that the visible-light modulation can serve as a promising technique for exploiting highly selective gas-sensitive devices operating at room temperature.
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Chemosensors
·
2023
·Vol. 11
·期 5
·289
·
IF 4.2
Ji Zhang,Fangfang Zhang,Xu Li,Qingji Wang
With increasingly serious environmental problems caused by the improvement in people’s living standards, the number of cars has increased sharply in recent years, which directly leads to the continuous increase in the concentration of NO2in the air. NO2is a common toxic and irritant gas, which is harmful to both the human body and the environment. Therefore, this research focuses on NO2detection and is committed to developing high-performance, low detection limit NO2sensors. In this study, flower-like Au-loaded In2O3was successfully fabricated using the hydrothermal method and the wet impregnation method. The morphological features and chemical compositions of the as-prepared samples were characterized using SEM, TEM, XRD and XPS. A variety of sensors were fabricated and the gas-sensing properties of sensors were investigated. The results indicate that the sensor based on 0.5 mol% Au/In2O3shows a response value of 1624 to 1 ppm NO2at 100 °C, which is 14 times that based on pure In2O3. Meanwhile, the detection limit of the sensor based on 0.5 mol% Au/In2O3for NO2is 10 ppb, and the response value is 10.4. In addition, the sensor based on 0.5 mol% Au/In2O3also has high selectivity to NO2among CO, CO2, H2, CH4, NH3, SO2and H2S. Finally, the sensitization mechanism of Au/In2O3was discussed, and the reasons for improving the performance of the sensor were analyzed. The above results and analysis demonstrate that the gas-sensing attributes of the sensor based on 0.5 mol% Au/In2O3to NO2improved remarkably; at the same time, it has been proved that the composite material has extensive potential in practical applications.Keywords:NO2sensor;flower-like;Au-loaded In2O3;low detection limit;high selectivity
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Yunpeng Wang,Yue Niu,Ruiting Hao,Jing Zhou,Meng Guo,Ying Liu,Wenbo Liu,Yanwei Chang,Hao Li,Yao Wang,Guofu Zhou
Structure nanocrystallization dramatically enhances the specific surface area and is one of the most popular methods for preparing high-performance gas sensing materials. However, most of the preparation methods are suffering high-cost and long time-consuming. This work synthesized Cu 2 ZnSnS 4 (CZTS), a cost-effective and stable direct-bandgap semiconductor with cauliflower-like morphology by facile solution drop coating and low-temperature annealing. The morphology and gas sensing performance of CZTS films could be modulated by controlling the annealing time. The gas sensors showed a significant response toward ppb-level NO 2 (1.287 toward 50 ppb) with a short response, recovery time, and high selectivity at room temperature (25 °C). It is worth mentioning that the limit of detection is 50 ppb, which is the first report on the ppb-level detection ability of CZTS-based NO 2 gas sensors. The enhanced sensitivity of the cauliflower-like CZTS nanocrystal-based gas sensor can be ascribed to the small grain size, large specific surface area for effective gas diffusion, and excellent conductivity of the spherical packed structure.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 48
·期 3
·1254-1263
·
IF 3.3
Ziyang Cui,Lu Wang,Yangyang Zhu,Yiqun Zhang,Li Juan Wang
Here, the facile strategy of preparing filamentous copper phthalocyanine (CuPc) based gas sensors using a solution method was studied. Electrical and gas sensitive properties of filamentous CuPc films transistors were studied in detail. The filamentous CuPc films had a three-dimensional and porous structure, the gas analytes could interact more effectively with the gas sensitive layers, and the efficiency of charge carrier conversion into conductive channel increased, thus improving the sensing performance of the sensors. The relative responsivities of 75 mg mL−1 filamentous CuPc films sensors to 20 ppm NO2 gas were 32797%. The response rate was 80%. The sensitivity was 1492%/ppm. The LOD was 0.3 ppm. The successful preparation of filamentous CuPc films and their application in sensors lay a foundation for the future application of phthalocyanine materials in the field of flexible sensing.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Yuanmeng Tian,Ming Kong,Zeyu Tao,Chen Yang,Shanshan Shang,Qinfen Gu,Daniel C.W. Tsang,Liangchun Li,Jin Shang
One promising method for mitigating low-temperature and low-concentration NO 2 pollution is selective adsorption using porous solid materials. However, the corrosive nature of NO 2 renders the development of an adsorbent with high and cyclable NO 2 uptake a formidable challenge. Herein, we attempted to address this challenge by developing a microporous covalent triazine framework (CTF) as effective adsorbents for NO 2 capture, achieving unprecedented high cyclable capacity enabled by simultaneous high adsorbent stability and moderate adsorption affinity via tuning specific binding sites. Using dynamic column breakthrough experiments, we demonstrated that the pristine CTF exhibited a high NO 2 adsorption capacity (dry: 3.83 mmol/g; wet: 5.26 mmol/g) overtaking most reported solid adsorbents, thanks to abundant active sites (e.g., nitrogen/carbon/triazine rings). Post-synthesis converted the surface nitrogen to protonated nitrogen site and further to transition metal site affording more effective binding sites that allows for moderately strong adsorption, resulting in elevated NO 2 adsorption capacity (dry: 6.11 mmol/g; wet: 8.97 mmol/g) and a highest reversible NO 2 adsorption (retaining 91 % and 64 % at dry and wet conditions after five cycles, respectively), as illustrated by our mechanistic study using in situ DRIFTS and DFT calculations. This work affords not only promising adsorbents for real-world applications in mitigating NO 2 pollution, but also a strategy of developing robust adsorbents with desired affinity generally applicable to adsorptive capture of corrosive and toxic gases.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Fuqiang Guo,Cheng Feng,Zheng Zhang,Lili Zhang,Chang Xu,Congting Zhang,Shuang Lin,Huanxing Wu,Baohua Zhang,Aersi Tabusi,Yineng Huang
In this paper, the Ti 3 C 2 T x /CuO nanocomposites were successfully prepared by an environment-friendly and simple hydrothermal method . The synthetics are evaluated using a series of characterization techniques, such as XRD , SEM, TEM , XPS , FTIR, UV–vis, and BET techniques. The results show that Ti 3 C 2 T x /CuO nanocomposites are mesoporous and have a higher specific surface area than Ti 3 C 2 T x , confirming the presence of more gas adsorption/diffusion regions. Furthermore, the Ti 3 C 2 T x with the introduction of CuO has rich oxygen vacancies and adsorbed oxygen. In particular, the response of Ti 3 C 2 T x /CuO sensor (56.99%) is 5 times higher than that of Ti 3 C 2 T x (11.17%) sensor to 50 ppm NO 2 at room temperature (RT). Especially, the Ti 3 C 2 T x /CuO sensor exhibits ultra-fast response/recovery time (16.6/31.3 s to 20 ppm NO 2 ), great reversibility , outstanding selectivity to NO 2 , and desirable long-term stability (over 40 days). The enhanced gas sensing performance may be attributed to the formation of hybrid heterojunctions between CuO and Ti 3 C 2 T x that provide carrier migration channels to hasten the redox reaction . At the same time, Ti 3 C 2 T x /CuO possesses more oxygen vacancies and adsorbed oxygen than Ti 3 C 2 T x , which will reduce the required energy for gas adsorption to further enhance the gas sensing performance. Hopefully, the above improved gas sensing performance indicators modified with CuO are expected to become the advantage of constructing Ti 3 C 2 T x -based sensor, which will be put into commercial NO 2 detection in the future.
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