CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Ping Guo,Xuyang An,Xinxin He,Yinhua Hu,Jia Zhang
NO 2 is a prevalent atmospheric pollutant known to cause significant harm to both the environment and human health. In practical applications, the development of NO 2 sensors capable of functioning over a wide humidity range with high sensitivity and stability is crucial. Here, the Pt-decoration multi-scale three-dimensional Bi 2 S 3 nanoflower structure assembled by one-dimensional nanorods and two-dimensional reticulated nanomeshes was constructed by integrating the geometrical and electronic effects. The Pt/Bi 2 S 3 based sensors exhibit a high response of 3.92 and rapid response/recovery times of 15 s/136 s to 1 ppm NO 2 at room temperature. Furthermore, the Pt/Bi 2 S 3 based sensors show excellent selectivity and stability across a wide range of humidity levels (10 %-90 %RH). Finally, a portable NO 2 detector was designed for data acquisition and wireless transmission to enable real-time gas detection and hazard warning. Our study presents a multi-scale structure for sensitive materials design and practical application of high-performance NO 2 sensors operated in a wide humidity range at room temperature.
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高影响因子
CRYSTENGCOMM
·
2015
·Vol. 17
·期 11
·2376-2388
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IF 4.034
Xiang-Sheng Zhai,Wen-Gang Zhu,Wei Xu,Ya-Jing Huang,Yue-Qing Zheng
Four new 3D uranyl complexes, [(UO2)2(H2O)(ipa)2]·9H2O (1), [(UO2)2(H2O)(nip)2]·H2O·Et3NH (2), [(UO2)2(H2O)(aip)2]·Et3NH (3) and [(UO2)(hip)]2·17H2O (4) (H2ipa = isophthalic acid, H2nip = 5-nitroisophthalic acid, H2aip = 5-aminoisophthalic acid, H2hip = 5-hydroxyisophthalic acid, Et3N = triethylamine), were hydrothermally synthesized. Structural analyses reveal that compounds 1–4 consist of pentagonal bipyramidal uranyl monomers bridged via acid inkers to form a structural motif, [(UO2)2L2], serving as the foundation of the 3D framework. Two structural motifs adopt different arrangement modes to connect to two types of chains. For 1–3, uranium atoms and carboxyl groups being from two types of chains respectively are coordinated to build similar 3D frameworks, while for 4, one type of chain links to the 3D architecture by the bond of the uranium atoms and –OH of the 5-hydroxyisophthalic acid ligand. The different guest molecules and structure assemblies displayed by the four compounds are a function of the variation of substituent groups of 5-X-1,3-benzenedicarboxylic acid (X = –H, –NO2, –NH2, –OH). Furthermore, the photocatalytic properties of 2 and 4 for degradation of rhodamine-B (RhB) upon xenon lamp irradiation have been examined. Elemental analysis, infrared spectroscopy, DRS and luminescence properties were also discussed.
研究领域:
无机化学
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配位化学
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材料科学
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物理化学
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环境化学
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Junxue Liu,Wenyan Ma,Yufei Wang,Qinfen Gu,Qinhe Pan,Siyu Zong,Minghao Qin,Jiyang Li
Monitoring of gallic acid (GA) in food and biothiols in humans is crucial for body health. Nanozyme-mediated colorimetric strategy for evaluating them has been widely applied nowadays, however, the inferior efficient and susceptible single-signal recognition limit its further application. Herein, a sensitive biosensor was first constructed for bimodal detection of GA and biothiols based on CDs@MIL-53(Fe)-NO 2 , prepared through a facile and time-saving microwave treatment. Benefiting from the excellent fluorescent and electron transfer properties of CDs, CDs@MIL-53(Fe)-NO 2 exhibited significant enhanced blue fluorescence and oxidase-like activity, which could oxide colorless 3,3′,5,5′-tetramethylbenzidine without H 2 O 2 , and the blue product could quench the fluorescence of composite. The dual-mode assay based on such bifunctional nanozyme showed an extremely sensitivity towards GA/ l -cysteine/homocysteine with the detection limit of 62/65/124 nM and 17/16/27 nM in colorimetric/fluorescent modes, respectively. The practicability in real samples and portability based on a smartphone of the analysis has been investigated with reliable results.
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高影响因子
FOOD CONTROL
·
2021
·
IF 5.548
Weixia Yang,Jinmeng Wang,Yong Han,Xueli Luo,Wenzhi Tang,Tianli Yue,Zhonghong Li
Pb(II), a highly toxic heavy metals that targets the human nervous system, has contaminated water and food in recent years. The nanomaterial of Metal–organic frameworks (MOFs) possesses superior removal performances. However, their practical application is limited by their nature of fine powdery. Herein, we developed robust MOFs film without the adding of polymer in MOFs ink and the modification of the substrate, which was achieved by choosing appropriate substrate of gelatin hydrogel with functional groups and simple thermal-treatment after coating UiO-66-NO 2 onto gelatin hydrogel. The volatilization of the UiO-66-NO 2 dispersant ethyl acetate promotes the rearrangement and dense accumulation of UiO-66-NO 2 crystals to form a dense UiO-66-NO 2 film. During the following thermal-treatment process, –COOH of UiO-66-NO 2 and –NH 2 of gelatin chemically reacted to establish the stable composites of UiO-66-NO 2 film and gelatin hydrogel. The results of batch adsorption experiments demonstrate that adsorption behaviors of the as-synthesized gelatin/UiO-66-NO 2 film composite hydrogels can be explained by the pseudo-second-order kinetic model and the Langmuir isotherm model, stating that this adsorption process involves with a chemical monolayer adsorption. Besides, gelatin/UiO-66-NO 2 film composite hydrogels own satisfactory removal efficiency for Pb(II) in apple juice, and the adsorption process has little impairment on the quality of apple juice. These results suggest that MOFs film is suitable for water decontamination and food safety control fields.
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Reaction Kinetics Mechanisms and Catalysis
·
2024
·
IF 1.7
Yan Jiaqi,Fu Weiwen,You Kuiyi,Zhao Fangfang,Luo He’an
A solvent-free, acid-free, and efficient strategy was developed for the selective preparation of 4-nitro-o-xylene (4-NOX) from the catalytic nitration of o-xylene with NO 2 mediated O 2 over BiCl 3 immobilized silicic acid catalyst (BiCl 3 -SA). The results indicated that the Lewis acid BiCl 3 -SA conjoined NO 2 –O 2 as a composite system synergistically promotes o-xylene conversion and 4-NOX selectivity. Under optimal conditions, 52.4% of o-xylene conversion with 68.4% 4-NOX selectivity was obtained at 35 °C. The characterization demonstrated that the highly dispersed metal Bi species form stable chemical bonds with the SA surface, which can effectively inhibit the loss of metal species and generate abundant acid sites. The developed catalyst is not only inexpensive but also has excellent stability and catalytic performance. Furthermore, a plausible mechanism for the catalytic nitration of o-xylene using NO 2 as a nitration agent over BiCl 3 -SA was proposed. This work provides an eco-friendly and practical protocol for improving desirable 4-NOX selectivity and reducing the discharge of acidic wastewater, with potential application prospects. Graphical abstract
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高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 39
·15111-15120
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IF 4.569
Jiao Wang,Linlin Zhang,Yuanyuan Wang,Yongjian Niu,Dong Fang,Qingxiao Su,Cheng Wang
Electrocatalytic nitrate reduction offers a sustainable route to ammonia synthesis and wastewater treatment. However, the nitrate-to-ammonia conversion remains inefficient due to the sluggish kinetics and diverse side reactions. Herein, well-faceted CuNi nanocrystals with Ni-rich surfaces and favorable d-band centres were synthesized with the assistance of γ-cyclodextrin via a solvothermal process. When used as catalysts for nitrate electroreduction, they delivered an ammonia yield of 1.374 mmol h−1 mg−1 (0.5496 mmol h−1 cm−2) at −0.3 V with the faradaic efficiency and selectivity reaching 94.5% and 65.0%, respectively, surpassing pure Cu or Ni nanocrystals and most reported catalysts. Such excellent performances originated from the optimal geometric and electronic structures and special element distribution, which optimized the adsorption behaviors and accelerated the reaction kinetics. A NO3−–NO2−–NH3 pathway was proposed with the chemical process following the initial electron transfer process as the rate-determining step. This work sheds light on the design of efficient catalysts to achieve carbon neutrality through simultaneous geometric and electronic structure modulation.
研究领域:
材料科学
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催化
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环境化学
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电化学
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PubMed
高影响因子
ACS Sensors
·
2025
·
IF 9.1
Xiao Ma,Rong Tan,Hong Chen,Jiawei Zhang,Lei Ge,Tingting Zhao,Xinyu Wang,Kaikai Yuan,Hairui Fang,Dong Wang
Nitrogen dioxide (NO2), the main component of pollutants in atmospheric environments, causes and exacerbates respiratory diseases, especially during outdoor sports even at the 100 ppb level. Currently, environmental gas detection still faces challenges such as high detection limits, low SNR, and low sensitivity. A NO2 sensor based on In(OH)3-α-Fe2O3–ZnO was prepared using a hydrothermal method, featuring an ultralow detection limit of 82 ppt, an exceptionally high SNR of 574,000, and an ultrahigh sensitivity of 252.25 mV/ppm (100 ppb to 1 ppm). And this sensor exhibits excellent response, selectivity, and repeatability. These excellent sensing characteristics come from the adsorbed oxygen on the surface of the material with the formation of n–n heterojunctions. Additionally, a low-power, portable, and cost-effective environmental monitoring system (named Smart Breath Sentinel (SBS)) was designed to intelligently upgrade ordinary masks. SBS enables real-time wireless environmental gas monitoring with integrated humidity compensation to ensure accurate measurements in high-humidity environments. SBS has already been tested in multiple environments, and the test results have proven the feasibility of SBS. This sensor based on In(OH)3-α-Fe2O3–ZnO demonstrates significant potential for applications aimed at enhancing human safety.
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