CRYSTAL GROWTH & DESIGN
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2025
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IF 3.4
Aerzigu Xukeer,Jin Li
The ternary nanocomposite ZnO/MnO2/g-C3N4 was synthesized for room-temperature ammonia gas detection. Incorporation of g-C3N4 into the ZnO/MnO2 heterostructure significantly improved the composite’s sensing sensitivity at ambient conditions. g-C3N4 facilitated electron migration across the heterojunction interface, boosting conductivity, and provided abundant adsorption sites for ammonia molecules due to its layered structure. The ZnO/MnO2/g-C3N4 composite material exhibits outstanding ammonia sensing performance, with its detection sensitivity being 2.4 times that of the ZnO/MnO2 system. Notably, this material demonstrates rapid response and recovery characteristics, with recorded times of 7.3 and 1.6 s, respectively, thereby optimizing its functional performance and expanding its range of operational applications. The study found that the optimal doping ratio of ZnO/MnO2/g-C3N4 can effectively enhance the material’s specific surface area and electron mobility, thus improving its ammonia adsorption capacity and optimizing the sensor’s response and recovery characteristics. The synthesis employed a sequential two-step strategy: initial formation of a ZnO/MnO2 heterostructure followed by g-C3N4 integration. This approach effectively mitigated limitations of pure ZnO, including sluggish desorption kinetics and low response magnitude. Density functional theory (DFT) computations were employed to elucidate the atomic-level sensing mechanism, revealing significant charge redistribution at the ZnO/MnO2/g-C3N4 heterojunction interfaces upon ammonia adsorption.
研究领域:
材料科学
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传感器技术
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纳米材料
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表面化学
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气体传感
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DOI
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 11
·1-11
·
IF 5.3
Huang Ziyu,Yang Guangwei,Deng Qiuling,Zhang Xuhui,Wei Xiaoping,Li Jianping
Methidathion (MTDT), a common organophosphorus pesticide with high insecticidal activity, is widely used for pest control. However, the misuse of MTDT leads to widespread residues and endangers human health. Therefore, it is crucial to develop a simple and highly sensitive method for the detection of MTDT residues. Herein, ZIF-90/MnO 2 /g-C 3 N 4 /Fe 3 O 4 composite particles were synthesized: The MnO 2 nanosheets could absorb the energy of the excited g-C 3 N 4 to quench the ECL of g-C 3 N 4 while ZIF-90 acted as a mimetic enzyme to catalyze the formation of thiocholine from MTDT. The thiocholine caused the reduction of MnO 2 to Mn 2+ , restoring the ECL signal of g-C 3 N 4 . Combined with molecular imprinting technique, an electrochemiluminescence sensor was constructed for the determination of MTDT. The determination range was 1.00 × 10 –9 ~ 7.00 × 10 –7 g/L, and the detection limit was 6.58 × 10 –10 g/L. Structurally similar organophosphorus pesticides showed no cross-reactivity. The method has high sensitivity and specificity, and has been successfully applied to the determination of MTDT residue in fruits with recoveries in the range 93.75% ~ 102.37%. Graphical abstract
研究领域:
分析化学
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环境科学
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农药检测
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DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2026
·
IF 10.4
Wenjing Liu,Linchun Nie,Dejing Meng,Rui Yang,Haobo Yang,Shuwen Cao,Jianzhi Wang,Qingxiang Zhou
Dispersed loading of MnO 2 on g-C 3 N 4 resulted in enhanced oxidase-like activity. • MnO 2 @g-C 3 N 4 nanozyme exhibited excellent selectivity to carbaryl • Target nanozyme showed good anti-interference ability • Smartphone-assisted visual detection achieved good sensitivity and reliability. In present work, MnO 2 @g-C 3 N 4 nanozyme was synthesized via a calcination-hydrothermal two-step method to achieve enhanced oxidase-like activity based on the conception of electron transfer regulation and effectively loading for avoiding agglomeration to expose more active sites. Herein, g-C 3 N 4 served as a dispersing substrate for MnO 2 with oxidase-like activity and regulating the interfacial electron transfer, and their synergistical catalytic effect accelerated the conversion of dissolved oxygen to superoxide anion radicals (•O 2 − ), which oxidized 3,3′,5,5′-tetramethylbenzidine (TMB) to blue products. Carbaryl can be adsorbed on g-C 3 N 4 surface through π-π stacking interactions, while its carbamate group can be bound to the active centers of MnO 2 . By Lineweaver-Burk plot method, the steady-state kinetic analysis showed that carbaryl had a mixed inhibitory effect on electron transfer and the production of superoxide anion radical (•O 2 − ). Based on this principle, a smartphone-based colorimetric sensor was constructed for carbaryl detection, which exhibited a linear response in the range of 6.3–210.2 μM, with a detection limit of 3.79 μM and a quantitation limit of 12.64 μM. The method achieved satisfactory recoveries (94.3–107.5%) for spiked fruit peel samples and owned great application prospect.
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DOI
PubMed
高影响因子
DESALINATION
·
2023
·
IF 9.9
Xueying Gao,Zhenzhen Fu,Yanfei Sun,Dewei Wang,Xiaoxuan Wang,Zishan Hou,Jinrui Wang,Xia Liu,Shiyu Wang,Shuyun Yao,Huiying Zhang,Shuyuan Li,Zheng Tang,Weijie Fu,Kaiqi Nie,Jiangzhou Xie,Zhiyu Yang,Yi-Ming Yan
While MnO 2 has been identified as a potent agent in the desalination process , its efficacy is significantly impeded by its inherent poor electrical conductivity and substantial ion diffusion barriers . By orchestrating an interfacial electron bridge within the MnO 2 /g-C 3 N 4 heterostructure , reinforced through N p z -Mn d z 2 orbital hybridization, we have managed to significantly boost both SAC and SAR in the HCDI process. The reinforced N p z -Mn d z 2 orbital hybridization triggers a substantial electron transition from g-C 3 N 4 to MnO 2 , culminating in a high Mn d z 2 electron occupancy. Further analysis reveals the formation of a Mn N chemical bond at the MnO 2 /g-C 3 N 4 interface, operating as an essential electron transfer bridge from g-C 3 N 4 to MnO 2 . This process concurrently initiates a rise in the Mn d z 2 orbital energy level, equipping the Mn d z 2 electron with superior redox activity. With these enhancements, the manufactured MnO 2 /g-C 3 N 4 exhibits exemplary performance, boasting an improved SAC of 68 mg g −1 and SAR of 3.6 mg g −1 min −1 with a decreased energy consumption of 0.7224 kWh kg −1 at 1.2 V. This innovative work offers an unconventional roadmap for activating electron redox activity and thereby accelerating charge transfer in transition metal oxides .
研究领域:
材料科学
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环境科学
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电化学
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水处理
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产品关联
DOI
高影响因子
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