COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Xiaoqing Wang,Shiyao Jin,Yangdong Cui,Jing Zhang,Hongjing Lu,Yujie Ren,Guoxin Du,Junhe Ji,Jionghui Li,Chunhua Xiong
A series of Co 3 O 4 @C-N (N = 1, 2, 3) composite photocatalysts were prepared by simple agitation and pyrolysis for degradation of organic dyes. The hollow macroscopic spherical structure of Co 3 O 4 @C-2 was constructed by adjusting the pyrolysis time. Compared with pure Co 3 O 4 , the carbon composite Co 3 O 4 @C-2 significantly enhanced light absorption in the UV and visible range, improved the electron transport efficiency and prevented the necessary photoexcited electron-hole pair recombination. Hence, the photocatalytic degradation rate of methylene blue (MB, 20 mg/L) reached 100% in 120 min under UV–vis light irradiation . Under the coupling of Co 3 O 4 and graphitized carbon, Co 3 O 4 @C-2 obtained high structural stability, good reusability and low biotoxicity. Scavenging experiments and ESR test showed that •O 2- radical was the active species for MB removal. After six cycles of tests, the photocatalytic efficiency of Co 3 O 4 @C-2 remained at 90.42%. The macroscopic spherical structure Co 3 O 4 @C-2 effectively avoids the problem of dispersion and recovery of powder catalyst, which also paves a path for the designing of candidate commercial photocatalyst with high efficiency and low consumption.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Tao Wen,Yang Feng,Yuqiang Bi,Liang Xu,Changping Guo
In this work, nano Co 3 O 4 /C composite catalyst was in-situ synthesized on sponge by high-temperature calcination , and as a catalyst for the thermal decomposition of AP. SEM, EDS , XRD and BET analyses showed that the prepared samples were evenly distributed and nano-sized Co 3 O 4 /C composites. Moreover, the catalytic effect of the nanocomposite catalyst on the thermal decomposition of AP was studied by DSC and TG. The influence of different factors on the thermal decomposition performance of AP were studied. The results indicated that when the Co 3 O 4 /C composite catalyst content was 5 wt%, the high-temperature decomposition (HTD) peak of AP was reduced from 430.1 to 319.0 ℃ and the activation energy from 237.5 down to 81.1 kJ mol −1 . In addition, the possible catalytic mechanism was also briefly discussed. Therefore, all the results indicated that the 3D porous nano Co 3 O 4 /C composite catalyst demonstrated excellent catalytic performance for the thermal decomposition of AP.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xiaoqing Wang,Jing Zhang,Rui Wang,Yujie Ren,Shiyao Jin,Shimin Wang,Hongjing Lu,Yongjiang Wang,Junzi Zhao,Chunhua Xiong
We present a strategy for the modification of an ion-exchange resin (D113) as an inexpensive carbon source to obtain a macrospherical photocatalyst precursor that can be transformed into a stable all-solid-state Z-scheme heterojunction catalyst (denoted Bi 2 O 3 -Co 3 O 4 @C). X-ray diffractometry and Fourier transform infrared and Raman spectroscopy measurements confirmed the presence of highly graphitized carbon in the complex. Significantly, the cost of the as-prepared material was only 1/200 of that of commercial carbon nanotubes and 1/80 of that of graphene oxide . Aided by the organic carbon source, Bi 2 O 3 -Co 3 O 4 @C showed an enhanced light absorption, hindered electron–hole recombination, and an enhanced photocurrent response. Under simulated solar irradiation, Bi 2 O 3 -Co 3 O 4 @C (20 mg/L) showed degradation efficiencies of 100%, 47.52%, 94.28%, and 100% for methylene blue, rhodamine B, tetracycline, and Cr(VI), respectively, after 120 min. Herein, the highest turnover frequency (TOF) obtained under irradiation was 2.5 h −1 for Cr(VI). Further, the degradation efficiency for methylene blue trihydrate remained 91.46% after five cycles, indicating significantly higher stability than that of a catalyst prepared without graphitic carbon. The optimized band structure and photocatalytic mechanism of Bi 2 O 3 -Co 3 O 4 @C were determined based on ultraviolet-visible measurements and plane-wave density functional theory calculations in VASP. The findings of this study indicate the promise of the Bi 2 O 3 -Co 3 O 4 @C macrospheres for industrial applications based on their photocatalytic performance, high stability, low cost, and suitable particle size.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2023
·Vol. 136
·期 1
·13-22
·
IF 1.8
Tian Lu,He Jie-Xin,Huang Xin-Yang,Feng Yang,Lu Yue-Wen,Wang Rui-Hao,Wang Qian,Guo Chang-Ping
Herein, nano-Co 3 O 4 /C composite catalyst was successfully synthesized by calcination of cobalt alginate (CA) film, which was prepared by ion exchange method. The morphology and structure of the films and calcined samples were characterized. It was found that the thickness of the film produced by Co 2+ substituted Na + was 20 μm, and the surface and side of the film were smooth and uniform. After the calcination of CA film at 400 °C, Co 3 O 4 nanoparticles grown in situ were loaded onto the carbonized alginate skeleton. The results of the thermal analysis showed that the higher the content of catalyst, the more obvious the catalytic effect on AP. Compared with pure AP, the exothermic peak temperature with 3 wt% nano-Co 3 O 4 /C composite catalysts decreased by 103.1 °C, demonstrating the catalytic effect on the nano-Co 3 O 4 /C. The nanocomposite catalyst could be synthesized quickly and in large quantities in this way, which had certain theoretical and practical value for improving the combustion behavior of AP-based composite solid propellants. Graphical abstract Based on inspiring by biomaterial, we have designed and prepared a nano-Co 3 O 4 /C composite catalyst by a facile ionic crosslinking solidification method, which effectively enhanced the thermal decomposition of the ammonium perchlorate.
研究领域:
材料科学
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推进剂化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yuanzhong Li,Liling Li,Yufa Feng,Huize Wang,Jinyun Liao,Jianwei Ren,Weiyou Zhou,Mingyang He,Hao Li
Engineering and fabricating cost-effective and high-performing bifunctional catalysts for ammonia borane (AB) hydrolysis and methanolysis is paramount for their commercial availability. A series of rattle-structured CuO/Co 3 O 4 @C microsphere bifunctional catalysts for AB hydrolysis and methanolysis were produced using a simple hard template etching approach. The CuO/Co 3 O 4 @C-4 (4 refers to designed the mole ratio of Cu/Co) exhibits the best activity with TOF of 18.8 and 26.8 mol H2 ·mol cat -1 ·min −1 for AB hydrolysis and methanolysis, respectively. It is discovered that the excellent performance is mainly attributed to its unique rattle structure and the synergetic effect between Co 3 O 4 and CuO . Kinetic isotope effect (KIE) experiments and infrared spectroscopy were applied to investigate AB hydrolysis and methanolysis reaction mechanisms. A suggested mechanism for AB methanolysis on rattle-structured CuO/Co 3 O 4 @C-4 is proposed based on the experiment results. This work could provide useful guidance for the construction of high-performance bifunctional catalysts for AB hydrolysis and methanolysis for hydrogen production.
研究领域:
材料科学
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催化化学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 46
·65487-65498
·
IF 4.223
Zhou
Jiacheng,Shen Qicheng,Yang Jie,Tariq Muhammad,Sun Wei,Cao Limei,Yang Ji
Co 3 O 4 is a promising Hg 0 removal catalyst for industrial application. Operating temperature and low sulfur resistance are two of the main problems that hinder its industrial application in Hg 0 removal. Herein, a metal-organic framework (Co-BDC) was introduced as a sacrificial template to obtain the catalyst nano-sized Co 3 O 4 @C by calcination. Part of the organic ligands is carbonized during the calcination. Carbon wrapped Co 3 O 4 and reduced metal agglomeration. The optimal Hg 0 removal temperature of the existing cobalt oxide catalysts was always around 150 °C, but H 2 -TPR showed that the oxygen atoms on the Co 3 O 4 @C were more active than those on Co 3 O 4 , causing the Hg 0 removal temperature window of Co 3 O 4 @C to shift to lower temperatures. The Hg 0 removal efficiency of Co 3 O 4 @C could reach almost 100% even at 25 °C. In the meanwhile, Co 3 O 4 @C also showed a strong SO 2 resistance at ambient temperature. Experimental results and characterization proved that SO 2 did not compete with Hg 0 on the surface of Co 3 O 4 at low temperatures. On the contrary, it participated in the oxidation of Hg 0 . This is a great improvement for Co 3 O 4 catalyst in Hg 0 removal. It reduces the restrictions on the application of Co 3 O 4 in Hg 0 removal. Co 3 O 4 @C shows considerable potential as an Hg 0 removal catalyst.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 58
·30573-30578
·
IF 3.708
Jun Wang,Bing Gao,Long Zhang,Rui Li,Jinpeng Shen,Zhiqiang Qiao,Guangcheng Yang,Fude Nie
Two-dimensional Co3O4 nanostructures with porous architectures are experiencing rapid development in functional material fields for their unique structures and properties. Porous Co3O4–C hybrid nanosheet (NS) arrays grown directly on various conducting substrates are synthesized by a controlled method for the first time via a facile hydrothermal synthesis approach in combination with heat treatment. These NS arrays reveal uniform hexagonal morphology and have combined properties of quasi-single-crystallinity and a pore network inside the architecture. A four-step formation mechanism is proposed to understand the growth process of nanosheet arrays grown on the substrate based on the change of morphology. Both the concentration of Co2+ and poly(vinylpyrrolidone) (PVP) play key roles in the formation of NS arrays. When tested as an anode material in lithium-ion batteries, the porous Co3O4–C hybrid NS arrays exhibit improved electrochemical properties of cyclic performance and high coulombic efficiency compared with the commercial Co3O4 and Co3O4/carbon nanocomposites. This approach, porous Co3O4–C NS arrays grown directly on different substrates (wafer, foam, alloy net, foil, especially flexible carbon cloth), provides an efficient route to produce NS arrays to meet the demand for diversity, and may be extended to synthesize other transition metal oxide materials for other applications.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Huixian Zhou,Hui Zhong,Yiqing Zeng,Yutang Kang,Bin Chen,Shuanglu Ma,Yifan Li,Yu Zhang,Shasha Feng,Zhaoxiang Zhong,Weihong Xing
The strategy of constructing catalytic membrane has a significant influence on its structure and performance. In this work, Co 3 O 4 -C x @SiO 2 nanofiber membranes (NFMs) were fabricated by an in-situ growth–pyrolysis–oxidation strategy. The Co 3 O 4 -C x catalyst derived from ZIF-67 was wrapped around nanofibers, which helps to maintain a stable membrane structure, then suppressing the reduction of gas permeability. Among the Co 3 O 4 -C x catalyst, the carbon skeleton can prevent the agglomeration of Co 3 O 4 nanoparticles, obtaining an ultra-fine Co 3 O 4 nanoparticles with high dispersibility, redox property and surface area. The obtained Co 3 O 4 -C 300 @SiO 2 NFM exhibits outstanding ammonia selective catalytic reduction (NH 3 -SCR) denitrification activity (T 90 = 225 °C at a GHSV of 77,000 h −1 ). The effect of catalyst loading on PM 2.5 filtration performance of SiO 2 NFM was also tested. Co 3 O 4 -C 300 @SiO 2 NFM has higher filtration efficiency (99.99%) than SiO 2 NFM at a lower pressure drop of 58 Pa, which suggests that catalyst loading via our method can improve the filtration performance of SiO 2 NFM. This work might provide a universal strategy for the design and preparation of highly efficient catalytic membrane.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2019
·
IF 3.25
Weiwei Qiu,Hidekazu Tanaka,Feng Gao,Qingxiang Wang,Mingqiang Huang
Porous nanododecahedron of Co 3 O 4 /C has been synthesized by calcination of the ZIF-67 in air at 400 °C and then be used as electrode material for fabricating a highly sensitive and low overpotential sensor of nitrite ion (NO 2 − ). The structure and morphology characterization show that ZIF-67 behaves as an ideal sacrificial template for preparing Co 3 O 4 /C with regular shape. The two components of Co 3 O 4 and carbon are uniformly distributed in the composite. Electrochemical analysis shows that the excellent electrocatalysis performance toward the oxidation of NO 2 − is based on the synergy of Co 3 O 4 and carbon in the nanocomposite. At NO 2 − concentration from 2 nM to 8 mM, a fast response time within 3 s is revealed and 1.21 nM of detection limit is achieved. The sensor is also reliable to analysis of NO 2 − existed in the real samples of soil leaching liquid and macrophage supernate.
研究领域:
材料科学
·
电化学
·
纳米技术
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xiyu Wang,Ying Lu,Gunel Imanova,Sridhar Komarneni,Jianfeng Ma
Antibiotics have garnered global attention as a pressing concern due to their wide spread discharge to the environment and resulting significant threats to both human health and the environment. The Sulfate Radical-based Advanced Oxidation Processes (SR-AOPs) technique has already been verified as an effective process for pollutant degradation. Herein, FeS 2 @Co 3 O 4 -C composites, utilizing ZIF-67-derived Co 3 O 4 -C as the substrate material, were fabricated using a single-step solvothermal technique for the degradation of tetracycline (TC) by activated peroxymonosulfate (PMS) in combination with visible light irradiation. In the FeS 2 @Co 3 O 4 -C/PMS/Vis system, the FeS 2 @Co 3 O 4 -C showed better activation performance than the single chemical activation system or photocatalytic system, with 97.2 % TC removed in 20 min. The FeS 2 @Co 3 O 4 -C composite material was thoroughly investigated employing X-ray diffraction (XRD) for analyzing its crystal structure, transmission electron microscopy (TEM) for detailed structural insights, scanning electron microscopy (SEM) for morphological examination, and X-ray photoelectron spectroscopy (XPS) for the elemental valence states. The quenching experiments, along with EPR test, revealed that the primary active oxygen species consisted of 1 O 2 , O 2 ·- , and h + . The results presented here suggest the impressive stability and recyclability of FeS 2 @Co 3 O 4 -C making it a potential candidate as an efficient catalyst for initiating the activation of PMS in degrading persistent organic pollutants present in water.
研究领域:
环境科学
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2022
·Vol. 52
·期 11
·1607-1616
·
IF 2.925
Zhang Yi,Zhang Liwen,Gong Tingcui,Li Tianhao,Li Xuenuan,Feng Jun,Tang Tingfan,Cheng Hao
Due to the highly porous structure, metal organic framework (MOF)-derived materials are extensively applied in the field of electroanalysis. In this experiment, an effective electrochemical sensing based on Co 3 O 4 /C-derived ZIF-67 MOF had been constructed for ultrasensitive determination of quercetin at trace level. The resultant Co 3 O 4 /C porous polyhedron of morphology and nanostructure were carefully examined using transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Brunauer–Emmett–Teller (BET) techniques. Differential pulse anodic stripping voltammetry (DPV) method was adopted to analyze quercetin under the optimized conditions. The DPV response of Co 3 O 4 /C film-coated glass carbon electrode (Co 3 O 4 /C/GCE) for quercetin determination was achieved a long linearity ranging from 0.5 to 30 µM, achieving high sensitivity about 1.830 × 10 − 6 A cm − 2 µM − 1 , and the detection limit was calculated to be 0.022 µM (S/N = 3). Besides, the fabricated Co 3 O 4 /C/GCE displayed excellent selectivity, desirable repeatability, and good reproducibility. More importantly, the proposed sensor exhibited satisfactory recovery ranges and accuracy for the determination of trace quercetin in human urine and serum samples, which will make it as an alternative advantageous choice for practical on-site determination. Graphical abstract
The porous Co 3 O 4 /C polyhedron derived by ZIF-67 MOF was successfully synthesized.
The as-synthesized material was employed to prepare chemically modified electrode
for ultrasensitive determination of quercetin. Then the Co 3 O 4 /C-modified glass carbon electrode is displayed good sensitivity and accuracy toward quercetin in urine and
serum samples.
研究领域:
电化学
·
材料科学
·
分析化学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 9
·1571
·
IF 5.719
Hao Gong,Shiguang Bie,Jian Zhang,Xianbin Ke,Xiaoxing Wang,Jianquan Liang,Nian Wu,Qichang Zhang,Chuanxian Luo,Yanmin Jia
The Co3O4electrode is a very promising material owing to its ultrahigh capacitance. Nevertheless, the electrochemical performance of Co3O4-based supercapacitors is practically confined by the limited active sites and poor conductivity of Co3O4. Herein, we provide a facile synthetic strategy of tightly anchoring Co3O4nanosheets to a carbon fiber conductive cloth (Co3O4@C) using the zeolitic imidazolate framework-67 (ZIF-67) sacrificial template via in situ impregnation and the pyrolysis method. Benefiting from the enhancement of conductivity and the increase in active sites, the binder-free porous Co3O4@C supercapacitor electrodes possess typical pseudocapacitance characteristics, with an acceptable specific capacitance of ~251 F/g at 1 A/g and long-term cycling stability (90% after cycling 5000 times at 3 A/g). Moreover, the asymmetric and flexible supercapacitor composed of Co3O4@C and activated carbon is further assembled, and it can drive the red LED for 6 min.Keywords:ZIF-67;Co3O4nanosheet;in situ growth;Co3O4@C;supercapacitor
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）