JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 12
·1-15
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IF 2.8
Song Xiaoxuan,Zhou Yi,He Wanhong,Chen Zhiyue,Xiao Yi,Huang Guihua,Feng Dujie,Zhang Jin
The development of efficient peroxymonosulfate (PMS) activated catalysts is important for the degradation and mineralization of organic pollutants. Metal-organic frameworks derived cobalt oxide modified cuprous oxide (Cu 2 O/Co 3 O 4 ) with carbon bone were constructed by driving a dual-precursors of zeolitic imidazolate framework (ZIF-67) and Cu 2 O, activating PMS for organic degradation. XRD, FT-IR, EDS analyses and XPS were used to demonstrate phase purity while SEM and HR-TEM were used to discover the shape of the synthesised material. EIS, transient current and LSV were used to enquire about the conductivity of the samples and change in current density accordingly. The degradation efficiency of Cu 2 O/Co 3 O 4 -10 for TC reached 89.8% within 60 min under dark conditions. Its activated degradation of oxytetracycline (OTC), levofloxacin (LEV) and ciprofloxacin (CIP) was 89.4%, 81.32% and 54.09%, respectively. Spherical cuprous oxide loaded on cubic cobalt oxide. Furthermore, the effective activation of PMS was achieved by increasing the electron donor capacity of Co and redox cycling of Cu. The single linear state of oxygen ( 1 O 2 ) produced by Cu 2 O/Co 3 O 4 is well adapted to H 2 PO 4 − and is active at pH = 7. Notably, Cu 2 O/Co 3 O 4 utilized hydrogen persulfate (HSO 5 − ) to generate superoxide radicals (·O 2 − ) and 1 O 2 in the PMS system by Co 3+ /Co 2+ and Cu 2+ /Cu + cyclic conversion. The strong interaction and electron transfer between Cu 2 O/Co 3 O 4 and PMS and the synergistic effect of the bimetallic oxide redox cycle accelerated improved the catalytic activity. In conclusion, this study provides a new perspective that is conducive to improving the practical application of sulfate radical-based advanced oxidation processes (SR-AOPs).
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CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Limin Hu,Guangshan Zhang,Qiao Wang,Yanlong Sun,Meng Liu,Peng Wang
A novel Co 3 O 4 -Bi 2 O 3 catalyst was synthesized by a microwave-assisted co-precipitation method and systematically characterized with multifarious techniques to investigate its crystallinity, morphology and chemical state of Co 3 O 4 -Bi 2 O 3 . The catalytic activity of Co 3 O 4 -Bi 2 O 3 in peroxymonosulfate (PMS) activation was assessed through bisphenol A (BPA) degradation. The results indicated that the catalyst synthesized by microwave irradiation and calcination treatment of 200 °C exhibited good stability, high catalytic activity and mineralization percentage of BPA degradation under a broad pH range in the Co 3 O 4 -Bi 2 O 3 /PMS system. The BPA degradation in aqueous solution of 20 mg·L −1 reached almost 100% within 30 min by using 0.3 g·L −1 of catalyst and [PMS]/[BPA] = 5 at pH ranging from 3.0–9.0. The activation energy ( E a = 50.59 kJ·mol −1 ) was calculated under different reaction temperatures, indicating that the catalytic reaction occurred easily in the Co 3 O 4 -Bi 2 O 3 /PMS/BPA system. According to the characterizations of catalyst, as well as the dissolving and trapping studies, it was illustrated that BPA molecules were degraded mainly by the surface-bound SO4 − radicals. At the same time, the increase of cobalt (III) content was caused by the catalytic reaction between PMS and cobalt (II) on the surface of catalyst. Overall, the study could lay groundwork toward the catalyst-activated peroxymonosulfate-based oxidation system in wastewater treatment.
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DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Xiaowei Liu,Konghu Tian,Chao Zhang,Jing Wang,Yufei Li,Lixin Xu,Chulgyu Jhun,Liang Zhang
This study obtained cobalt nitrate (Co 3 O 4 )/carbon fibers (CF) composites with a core-shell structure using in situ Co 3 O 4 growth on lightweight and flexible hydrophilic CF through a hydrothermal synthesis method and simple heat treatment to improve the attenuation of microwaves and their absorption properties. The urea content was adjusted to tune the needle-like morphology of Co 3 O 4 . The results showed that sample S3 had excellent microwave absorption (MA) performance with a minimum reflection loss ( RL min ) of −61.55 dB at a thickness of 4.75 mm. However, the thickness corresponding to the maximum effective absorption bandwidth (EAB, RL<-10 dB) of 4.72 GHz was only 1.88 mm, covering almost the entire Ku band. CF, as the core of structures, significantly impact microwave reflection. However, the Co 3 O 4 shell coating dominated the dielectric loss of the Co 3 O 4 /CF composite, and its MA performance improved with the refinement of the Co 3 O 4 structures. This study provided a practical solution for preparing lightweight and efficient transition metal oxide and carbon-based MA composites.
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Catalysts
·
2024
·Vol. 14
·期 7
·397
·
IF 3.8
Yuxuan Zhang,Ruibo Wei,Lin Yang,Jinming Ge,Feiyang Hu,Tingting Zhang,Fangyin Lu,Haiwang Wang,Jian Qi
The low-temperature oxidation of methane gas in coal mine exhaust gas is important for reducing the greenhouse effect and protecting the environment. Unfortunately, the carbon–hydrogen bonds in methane molecules are highly stable, requiring higher reaction temperatures to achieve effective catalytic oxidation. However, metal oxide-based catalysts face the problem of easy sintering and the deactivation of active components at high temperatures, which is an important challenge that catalysts need to overcome in practical applications. In this work, a series of Mn-Co3O4active components were grown in situ on ZSM-5 zeolite with mesoporous pore structures treated with an alkaline solution via a hydrothermal synthesis method. Due to the presence of polyethylene glycol as a structure-directing agent, manganese can be uniformly doped into the Co3O4lattice. The large specific surface area of ZSM-5 zeolite allows the active component Mn-Co3O4to be uniformly dispersed, effectively preventing the sintering and growth of active component particles during the catalytic reaction process. It is worth mentioning that the Mn-Co3O4/meso-ZSM-5-6.67 catalyst has a methane conversion rate of up to 90% at a space velocity of 36,000 mL·g−1·h−1and a reaction temperature of 363 °C. This is mainly due to the mesoporous ZSM-5 carrier with a high specific surface area, which is conducive to the adsorption and mass transfer of reaction molecules. The active component has an abundance of oxygen vacancies, which is conducive to the activation of reaction molecules and enhances its catalytic activity, which is even higher than that of noble metal-based catalysts. The new ideas for the preparation of metal oxide-based low-temperature methane oxidation catalysts proposed in this work are expected to provide new solutions for low-temperature methane oxidation reactions and promote technological progress in related fields.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Cui Zhang,Saiyu Dong,Zhaoli Liu,Nairu Liu,Xi Zhang,Jie Dong,Xueping Zhou,Yirong Guo,Jianxiang Wu
Immunochromatographic test strip (ITS) has been widely employed for point-of-care diagnoses. However, how to significantly enhance the analytical sensitivity of device-free ITS remains a challenge. Here, we synthesized a Cu single-atom anchored Co 3 O 4 (CuSA/Co 3 O 4 ) nanozyme that possesses ultrahigh peroxidase-mimicking catalytic activity owing to d -band center upshift mediated by Cu single-atom. Molecular orbital analysis demonstrated that d orbitals in CuSA/Co 3 O 4 have stronger orbital hybridization affinity than Co 3 O 4 to H 2 O 2 ′s π* orbitals. This reinforces hydroxyl radical ( OH) production and provides a stronger catalytic colorimetric signal, which is beneficial for improving the sensitivity of ITS. Moreover, we applied the CuSA/Co 3 O 4 to ITS as a signal reporter for monitoring Xanthomonas oryzae pv. oryzicola (Xoc) , the pathogen of rice bacterial leaf streak. The visual limit of detection (LOD) of the developed CuSA/Co 3 O 4 -based ITS was as low as 6.4 × 10 2 CFU mL −1 , which is 25-fold more sensitive than the traditional Au nanoparticles (AuNP)-based ITS. Taken together, this work demonstrates the great potential of CuSA/Co 3 O 4 nanocomposite as a signal reporter to improve the sensitivity of ITS for on-site Xoc detection.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Wenming Ding,Yan Hai,Xiaoman Li,Yang Yang,Shengbo Yuan,Li Zhang,Min Luo
Defect engineering offers a powerful approach to tune the local surface microstructure, electron band structure and chemistry of photo- and electro-catalysts, to thereby enhancing their performance in nitrogen reduction reaction (NRR) and electrocatalytic nitrate reduction to ammonia (NO 3 - RR). The present study has successfully synthesized cobalt-rich vacancy (V Co ) Co 3 O 4 through a two-step method, allowing for controlled manipulation of the concentration of cobalt vacancies through heat treatment. The impact of varying concentrations of cobalt vacancies on the performance of photocatalytic nitrogen reduction reaction and electrocatalytic nitrate ammonia production was investigated. Remarkably, the catalysts heat-treated at 500 °C, exhibited a significantly enhanced photocatalytic nitrogen fixation performance with a rate of 67.5 μmol·g -1 ·h -1 . The catalysts heat-treated at 300 °C, exhibited an ammonia yield of 339.05 mmol·g -1 ·h -1 at -1.1 V (vs. RHE), while achieving a maximum Faraday efficiency of 84.3 % at -0.9 V (vs. RHE). The enhanced activity can be attributed to the presence of cobalt vacancies, which synergistically modulate both the structural and electronic properties. This dual functionality of cobalt-rich vacancy Co 3 O 4 not only underscores its potential as a highly efficient photocatalyst for NRR and an electrocatalyst for NO 3 - RR but also highlights the intricate interplay between defect engineering, microstructural tuning, and electronic structure in promoting diverse catalytic activities. Our findings not only advance the fundamental understanding of defect-induced enhancements but also pave the way for the rational design of multifunctional catalysts capable of excelling in both photo- and electro-catalytic applications.
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APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Chao Gao,Guoqiang Zhao,Xiaochao Zuo,Huaming Yang
Cobalt-based materials exhibit great premises for activating peroxymonosulfate (PMS) toward water remediation. Generally, active Co species are anchored on the surface of supports to improve the utilization efficiency, yet the stability of the catalyst is difficult to resolve due to the weak interaction between the active species and the support. Herein, a molten salt method is employed to reinforce the interfacial interaction between Co 3 O 4 and montmorillonite (Mt) support. The use of molten Na 3 PO 4 can mitigate the dehydroxylation process of Mt, and thus the electronic structure of Co 3 O 4 NPs can be regulated by the surface hydroxyl species more efficiently. Consequently, the prepared Co 3 O 4 /Mt displays an enhanced Co II /Co III ratio, and the degradation of tetracycline (TC) could reach 99% in 7 min by the PMS-based advanced oxidation process . Meanwhile, the TC removal efficiency can still reach 96% after 8 cycles, and the Co ion leaching is over 10 times lower as compared with the catalyst prepared not using the molten salt. This study highlights the significance of the molten salt method for enhancing the strong interfacial interaction, which is crucial to regulating the nature of supported catalysts, and provide satisfactory Co-based catalyst for PMS activation toward TC degradation.
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Science China-Materials
·
2024
·
IF 6.8
Liu Haibing,Qiu Yanbin,Gan Wenxiu,Zhuang Guoxin,Chen Fei-Fei,Yang Chengkai,Yu Yan
Regulating charge transfer and reaction pathways are effective strategies for boosting photocatalytic CO 2 reduction. Herein, Co 3 O 4 /ZrO 2 mesoporous octahedrons are synthesized through facile pyrolysis of UIO-66@ZIF-67 core/shell octahedrons. The as-obtained Co 3 O 4 /ZrO 2 mesoporous octahedrons are assembled by highly dispersive and small-sized nanoparticles, with 13 nm average particle size and 5.8 nm pore width, leading to a high specific surface area of 43.11 m 2 g −1 . Benefiting from active-site engineering, the charge-transfer kinetics and CO 2 adsorption are successfully enhanced. In addition, density functional theory calculations reveal that ZrO 2 tailors the reaction pathway of CO 2 reduction by promoting CO 2 activation to *CO 2 and intermediate formation (*COOH and *CO), as well as decreasing the energy barrier of the rate-limiting step (*CO→CO). Thus, the Co 3 O 4 /ZrO 2 mesoporous octahedrons afford a turnover frequency of 28.82 h −1 , 16.95-fold larger than pure Co 3 O 4 .
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Scientific Reports
·
2018
·Vol. 8
·期 1
·1-10
·
IF 4.122
Lin Zhichao,Qiao Xiuwen
Coral reef has a unique dendritic structure with large specific surface area, rich pore structure, so that it can be attached to a large number of zooxanthellae for gas exchange. Coral reef ecosystems are also known as underwater rainforests. Inspired by this biological structure, we designed and fabricated coral-like Co 3 O 4 decorated N-doped carbon particles (Co 3 O 4 /N-CP). The obtained Co 3 O 4 /N-CP-900 catalyst shows efficient ORR electrocatalytic performances in an alkaline medium with a positive onset and half-wave potentials of 0.97 and 0.90 V (vs. RHE), as well as a high diffusion-limited current density (5.50 mA cm −2 ) comparable to that of a Pt/C catalyst (5.15 mA cm −2 ). It also displays better stability and methanol tolerance than commercial Pt/C. In addition, the Co 3 O 4 /N-CP-900 electrode has a high specific capacitance of 316.2 F g −1 in 6 M KOH, as well as good rate capabilities and excellent cycle performance. These results are due to large surface area, narrow pore size distribution, high density electrochemical energy conversion and storage activity centers. This method presented here offers an effective path for the development of high performance multi-functional carbon-based materials for ORR and supercapacitor applications.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 25
·期 5
·4656-4666
·
IF 2.741
Hu Limin,Zhang Guangshan,Liu Meng,Wang Qiao,Wang Peng
In this work, Co 3 O 4 -Bi 2 O 3 was successfully synthesized using a microwave-assisted method [Co 3 O 4 -Bi 2 O 3 (MW)] and employed as a peroxymonosulfate (PMS) activator for bisphenol A removal. A reference catalyst was prepared using the same preparation conditions but different heating mode and labeled as Co 3 O 4 -Bi 2 O 3 (CH). The series of Co 3 O 4 -Bi 2 O 3 was characterized using XRD, SEM, and N 2 adsorption to detect their crystallinity, morphology, and surface area, among others. Results indicated that both microwave and calcination significantly affected the characteristic and catalytic activity of the catalyst. Moreover, the microwave-irradiated catalyst calcined at 300 °C showed higher catalytic activity and mineralization percentage for BPA degradation than the conventionally heated catalyst calcined at the same temperature. Microwave temperature and microwave time of the proposed microwave-assisted method were also investigated. Compared with other catalysts, the present catalyst showed considerably superior preparation time and degradation efficiency. This study broadens a new horizon for advanced oxidation process using a PMS activator.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jun Wang,Bo Zheng,Zhiqiang Qiao,Jin Chen,Liyuan Zhang,Long Zhang,Zhaoqian Li,Xingquan Zhang,Guangcheng Yang
High energy density and rapid reactivity are the future trend for nano-energetic materials. Energetic performance of nano-energetic materials depends on the interfacial diffusion and mass transfer during the reacted process. However, the development of desired structure to significantly enhance reactivity still remains challenging. Here we focused on the design and preparation of 3D porous hollow Co 3 O 4 micro-spheres, in which gas-blowing agents (air) and maximize interfacial interactions were introduced to enhance mass transport and reduce the diffusion distance between the oxidizer and fuel (Aluminum). The 3D hierarchical Co 3 O 4 /Al based nano-energetic materials show a low-onset decomposition temperature (423 °C), and high heat output (3118 J g −1 ) resulting from porous and hollow nano-structure of Co 3 O 4 micro-spheres. Furthermore, 3D hierarchical Co 3 O 4 /Al arrays were directly fabricated on the silicon substrate, which was fully compatible with silicon-based microelectromechanical systems to achieve functional nanoenergetics-on-a-chip. This approach provides a simple and efficient way to fabricate 3D ordered nano-energetic arrays with superior reactivity and the potential on the application in micro-energetic devices.
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CHEMOSPHERE
·
2018
·
IF 4.427
Ruixia Yuan,Lin Hu,Peng Yu,Huaiyuan Wang,Zhaohui Wang,Jingyun Fang
Cobalt-based heterogeneous catalyst has been recognized as one of most efficient activators for peroxymonosulfate (PMS) decomposition, but usually suffers from the poor stability and difficulty to recover and reuse. Here easily recyclable cobalt oxide (Co 3 O 4 ) nanowires and nanoflowers grown on nickel foam (NF) are fabricated by a hydrothermal and calcination method. The prepared 3D Co 3 O 4 /NF catalyst is characterized and applied as a heterogeneous catalyst for PMS activation to generate sulfate radicals for decomposition of Acid Orange 7 (AO7). The results show that the AO7 degradation rate increases with cobalt loading and PMS dosage, but decreases with the increase of solution pH. The Co 3 O 4 /NF catalyst using 2 mM Co(NO 3 ) 2 ·6H 2 O as cobalt source exhibits highest activity, and almost complete decolorization could be achieved within 30 min. The diverse effects of coexisting anions (SO 4 2− , HCO 3 − , NO 3 − and Cl − ) on AO7 degradation are observed and explained. After 10 consecutive runs, excellent catalytic reactivity of the catalyst remains while the level of leached cobalt during the catalyst usage is much lower than the maximum allowable concentration in drinking and natural water. More importantly, the macroscopic Co 3 O 4 /NF catalyst shows advantage of easy recycling after application compared to traditional catalysts. It is believed that the as-prepared Co 3 O 4 /NF is promising to be an effective and green heterogeneous catalyst for PMS activation to degrade organic pollutants for environmental application.
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