CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Yaqian Pang,Junpeng Zhou,Xiaoli Yang,Yeqing Lan,Cheng Chen
In this study, the Co 3 O 4 -SnO 2 composite derived from bimetallic oxalates was rationally fabricated and utilized as a catalyst for peroxymonosulfate (PMS) activation towards the destruction of chloramphenicol (CAP). The physicochemical properties of the Co 3 O 4 -SnO 2 were systematically characterized to discover the relationship between its structure and catalytic performance. SnO 2 as a cocatalyst with high conductivity and stability immensely improved the activity of Co 3 O 4 in the Co 3 O 4 -SnO 2 composite. Approximately 98% of CAP (10 mg/L) was eliminated by the Co 3 O 4 -SnO 2 (0.1 g/L) activated PMS (1.0 mmol/L) at initial pH 7 within 20 min. The rationally designed Co 3 O 4 -SnO 2 composite exhibited higher catalytic activity than Co 3 O 4 , SnO 2 , and other cobalt-based bimetallic oxides (such as Co-Fe, Co-Mn, and Co-Cu) in the PMS activation for the CAP degradation. The synergistic effect of Co 3 O 4 and SnO 2 endowed the Co 3 O 4 -SnO 2 composite with higher conductivity and more electron transfer, which was proved by the electrochemical tests. The presence of SO 4 •− , • OH, O 2 •− , and 1 O 2 during the CAP degradation was testified by both quenching experiments and electron paramagnetic resonance (EPR) spectroscopy. In addition, the catalytic mechanism and degradation pathways were further proposed via the characterization of X-ray photoelectron spectroscopy (XPS) and the identification of transformation products, respectively. This work provides a new insight into the preparation of novel catalysts and their application in wastewater treatment.
研究领域:
环境科学
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催化材料
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DOI
高影响因子
ENVIRONMENTAL RESEARCH
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2020
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IF 5.715
Li Liu,Yunong Li,Wei Li,Ruixue Zhong,Yeqing Lan,Jing Guo
Co 3 O 4 –SnO 2 /rice straw biochar (RSBC) was prepared for the first time via calcining oxalate precipitation precursor dispersed on the surface of RSBC and used as a catalyst for activating PMS to degrade sulfisoxazole (SIZ). The results demonstrated that Co 3 O 4 –SnO 2 /RSBC possessed much better catalytic performance than Co 3 O 4 , Co 3 O 4 –SnO 2 , Co 3 O 4 /RSBC, and SnO 2 /RSBC, which is ascribed to the synergy of Co 3 O 4 , SnO 2 and RSBC. Approximately 98% of SIZ (50 mg/L) was decomposed by PMS (1 mmol/L) activated with Co 3 O 4 –SnO 2 /RSBC (0.1 g/L) within 5 min. The optimal degradation efficiency of SIZ was realized at the initial pH 9. Co 3 O 4 –SnO 2 /RSBC also displayed remarkable stability and reusability, and the degradation rate of SIZ maintained over 90% even after the fifth recycle run. The electron paramagnetic resonance (EPR) technique and quenching experiments proved singlet oxygen ( 1 O 2 ) to be the main reactive oxygen species (ROS) responsible for the SIZ decomposition in the Co 3 O 4 –SnO 2 /RSBC/PMS system. On the basis of the characterization analysis, the identification of the ROS and the SIZ degradation products , the possible mechanism and pathways of the SIZ degradation by a combination of PMS and Co 3 O 4 –SnO 2 /RSBC were further proposed. This study provides not only a new insight into non-radical mechanism for the heterogeneous activating PMS over Co 3 O 4 –SnO 2 /RSBC to degrade organic pollutants but also an eco-friendly synthetic route for exploring novel and efficient catalysts.
研究领域:
环境科学
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催化化学
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Wanjing Wang,Jianbiao Xian,Jin Li,Mengfang Yu,Qiutian Duan,Chung Ming Leung,Min Zeng,Xingsen Gao
In this work, Co 3 O 4 /SnO 2 heterojunctions were proposed and fabricated by single-nozzle electrospinning. Interestingly, novel yolk-shell nanofibers could be formed in a proper doped content of Co 3 O 4 . The gas sensing properties of sensors based on Co 3 O 4 /SnO 2 yolk-shell nanofibers were evaluated, and a superior response of ∼216–100 ppm acetone at 350 °C was obtained. Additionally, Our sensors have an ultrafast response time of ∼0.62 s, demonstrating remarkable selectivity for acetone and excellent stability for both humidity and long-term use. These exceptional performances are attributed to the synergistic effect of nano-heterojunctions that enhance the effective interfacial area , as well as the unique yolk-shell structure of SnO 2 /Co 3 O 4 , which increases gas transport channels. Our results demonstrate that constructing Co 3 O 4 /SnO 2 yolk-shell nanofibers is an effective strategy for achieving high-performance acetone gas detection.
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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DOI
高影响因子
MICROCHEMICAL JOURNAL
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2026
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IF 5.2
Muhammad Javed Liaqat,Shahid Hussain,Jahirul Islam,Mohammed Mujahid Alam,Rajesh Kumar Manavalan,Xiangzhao Zhang,Junlin Liu,Guanjun Qiao,Guiwu Liu
Preparation of Co 3 O 4 -SnO 2 heterostructures via hydrothermal method. • Peculiar morphology with abundant active sites and wide surface area. • Enhanced gas response (R g /R a ) of 92.8 with excellent sensitivity. • Excellent response is attributed to rapid charge transfer across p-n heterojunction. The recent development of p-n heterojunction sensors has attracted significant interest in gas sensing applications due to their excellent charge transfer, more active sites, and lower operating temperatures. In this research, Co 3 O 4 -SnO 2 heterostructured composite has been developed and investigated as a highly selective sensor for nitrogen dioxide (NO 2 ). The gas sensing results demonstrated a remarkable response of 92.8 to 100 ppm NO 2 at the optimal operating temperature of 200 °C. The sensor was tested over a wide temperature range (50–300 °C), demonstrating exceptional performance, remarkable repeatability, and consistent baseline recovery. The Co 3 O 4 -SnO 2 heterostructure has excellent long-term stability and consistently reliable detection across varying humidity conditions. The sensor's enhanced sensitivity to NO 2 was validated with selectivity tests for other interfering gases. An improved method revealing the NO 2 sensing approach is proposed, supported by density functional theory calculations to investigate the diffusion efficiency of investigated gases at Co 3 O 4 -SnO 2 heterostructures. The results indicated that Co 3 O 4 -SnO 2 heterostructures are an excellent option for practical NO 2 detection under different environmental conditions. Download: Download high-res image (400KB) Download: Download full-size image
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2020
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IF 3.83
Yanling Li,Shengchang Wang,Junke Wu,Jinfu Ma,Lihua Cui,Hui Lu,Zhilin Sheng
We successfully synthesized a novel core-shell hybrid metal oxide via a simple one-step hydrothermal method without annealing. This composite of Co 3 O 4 particles covered with SnO 2 –SnO (Co 3 O 4 @SnO 2 –SnO) predicted better performance compared to pure Co 3 O 4 , which strongly depends on the synthetic temperature. The Co 3 O 4 @SnO 2 –SnO prepared at a temperature of 250 °C (labeled Co 3 O 4 @SnO 2 –SnO-250) exhibited an outstanding specific capacitance of 325 F g −1 under the current density of 1 A g −1 , which was much higher than those of Co 3 O 4 (12.6 F g −1 ) and other composites. Additionally, the sample also exhibited good cycle stability performance with a retention rate of 100% after 5000 cycles at a current density of 5 A g −1 . Through X-ray photoelectron spectroscopy analysis, the presumed mechanism was that Sn-O x decreases the surface electron densities of Co 3 O 4 , which is beneficial to OH − adsorption and specific capacitance improvement, and the synthetic temperature had a strong impact on the microstructure and thus on the surface electron densities. The most. obvious finding to emerge from this study is that the specific capacitance can be improved through adjusting the surface electron densities of transition metal oxides .
研究领域:
材料科学
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能源存储
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2025
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IF 2.5
Jiaxuan Wei,Yue Hou,Zhaodi Zhang,Shuangshuang He,Yufei Li,Yuanzhen Zhou,Kangkang Wang,Zhen Wang,Yuan Dang
The combination of photoelectrocatalysis and persulfate-based advanced oxidation processes (AOPs) offers a promising strategy for in-situ ROS generation in environmental remediation. In this study, a light-assisted electrocatalytic system using Co3O4-SnO2/NF as the cathode was developed. Applying a low current suppressed the recombination of photogenerated charges, facilitating continuous hole (h+) generation to activate PMS and produce ROS, enabling efficient degradation of tetracycline (TC). Under optimized conditions, the system exhibited excellent pH tolerance, maintaining a high degradation efficiency (92%-100%) across a wide pH range from 3 to 11, significantly outperforming traditional Fenton-like systems limited to acidic conditions. Furthermore, the light irradiation introduction increased the TOC removal rate of TC by 20% compared to the single electrocatalytic activation system. It enhanced TOC removal rated addressed the importance of the external light radiation during the mineralization of TC. Quenching and EPR analysis confirmed that 1O2, SO4·-, and h+ were the dominant ROS. Their efficient production was attributed to the Co3O4-SnO2 heterojunction, which promoted charge separation and accelerated electron transfer in the Co redox cycle. This research holds significant importance in the field of light-assisted electrocatalytic activation of PMS to enhance the generation of ROS for efficient pollutant degradation.
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DOI
高影响因子
危险品化学品经营许可证（带存储）