NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 8
·3745-3757
·
IF 3.3
Litao Jia,Pei Yu,Ying Dong,Yonglei Xing,Juan Peng,Gang Ni,Xiaoyong Jin
The decomposition efficiency of refractory organic pollutants depends strongly on the characteristics of the photoanode semiconductors in the photoelectrocatalytic (PEC) process. The selection of superior materials with excellent PEC efficiency is a challenge in the practical application of PEC oxidation technology. Herein, a novel S-Co3O4/Bi2WO6 heterojunction photoanode was fabricated using a simple hydrothermal procedure. Compared with Bi2WO6 nanoflowers, the as-prepared S-Co3O4/Bi2WO6 photoanode had a large electroactive surface area, low charge transfer resistance, strong light absorption ability, and high separation efficiency for induced photogenerated electron/hole pairs (e−/h+). This relies on the fact that S doping not only controls the morphology of Co3O4 but also changes its intrinsic electronic structure to improve the interlayer polarization. Notably, the Z-scheme heterojunction formed by the combination of S-Co3O4 and Bi2WO6 not only enhances the e−/h+ separation efficiency but also results in a stronger redox ability than that of pure Bi2WO6. In addition, reactive species trapping experiments and electron spin resonance tests demonstrated that the S-Co3O4/Bi2WO6 photoanode plays a dominant role in the degradation of tetracycline (TC) by ˙O2− and ˙OH radicals. Therefore, the prepared S-Co3O4/Bi2WO6 photoanode exhibits better PEC performance than Co3O4, S-Co3O4 and Bi2WO6 in the degradation of TC. The optimized S-Co3O4/Bi2WO6 composite showed a degradation rate of 87.4% in 30 mg L−1 TC solution. This work provides a new strategy for the construction of efficient photoelectroanodes.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhihui Wei,Jie Li,Lixia Yang,Siyu Liu,Haicheng Li,Mingxia Lu,Tiantian Ying,Yan Luo,Kexin Li,Zhenglin Chen,Xiuping Zhang,Shenglian Luo
Degradation of halogenated organic compounds using the electro-reduction process is a promising approach for advanced water treatment. In this work, antiferromagnetic Co 3 O 4 nanoparticles were first loaded on a uniform anodic porous TiO 2 surface through a hydrothermal strategy, then subjected to an electrochemical reduction, which transform from nanoparticle-shape to interconnected nanoflakes. Compared with the pristine Co 3 O 4 nanoparticles, the morphologically transformed Co 3 O 4 cathode features a porous interface with amorphous Co(OH) 2 and CoOOH shell, which favors the generation of abundant •OH radicals along with lower overpotential for reducing H + to H*. On account of the plentiful radicals and self-supporting nature, the resulting Co 3 O 4 cathode retains high activity for efficiently degrading Thiamphenicol in water, even after 10 h run, demonstrating remarkable durability. Moreover, it is adaptable in a wide pH window of 3 to 10, and effectual when the initial Thiamphenicol concentration increases from 0.5 to 50 mg/L regardless of the water background (tap water, lake water, or river water). This study delivers a profound cognition about the dynamic behaviors of Co 3 O 4 -based electrocatalysts applied in eliminating halogenated antibiotics.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS
·
2022
·Vol. 22
·期 24
·9730
·
IF 3.847
Nguyen Thi Dieu Thuy,Xiaochan Wang,Guo Zhao,Tingyu Liang,Zaihan Zou
In this study, a screen-printed electrode (SPE) modified with cobalt oxide nanoparticles (Co3O4NPs) was used to create an all-solid-state ion-selective electrode used as a potentiometric ion sensor for determining nitrate ion (NO3−) concentrations in aquaculture water. The effects of the Co3O4NPs on the characterization parameters of the solid-contact nitrate ion-selective electrodes (SC-NO3−-ISEs) were investigated. The morphology, physical properties and analytical performance of the proposed NO3−-ion selective membrane (ISM)/Co3O4NPs/SPEs were studied by X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), transmission electron microscopy (TEM), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), potentiometric measurements, and potentiometric water layer tests. Once all conditions were optimized, it was confirmed that the screen-printed electrochemical sensor had high potential stability, anti-interference performance, good reproducibility, and no water layer formation between the selective membrane and the working electrode. The developed NO3−-ISM/Co3O4NPs/SPE showed a Nernstian slope of −56.78 mV/decade for NO3−detection with a wide range of 10−7–10−2M and a quick response time of 5.7 s. The sensors were successfully used to measure NO3−concentrations in aquaculture water. Therefore, the electrodes have potential for use in aquaponic nutrient solution applications with precise detection of NO3−in a complicated matrix and can easily be used to monitor other ions in aquaculture water.Keywords:screen-printed electrodes;ion-selective electrode;all-solid-state electrode;nitrate ion detection;cobalt oxide
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Dan Xu,Jianfeng Li,Boyang Li,Huacheng Zhao,Hanghang Zhu,Jinfang Kou,Fengwei Zhang,Zhengping Dong,Jiantai Ma
The sustainable catalytic transformation of alcohols to high value-added fine chemicals is a significant and challenging research topic. Herein, a set of nitrogen-doped carbon encapsulated Co-based catalysts (Co-Co 3 O 4 @NC-T) were prepared by using low-cost dicyandiamide, glyoxal and cobalt nitrate as precursors. The obtained catalysts were utilized for the selective oxidation of alcohols to high value-added esters and carboxylic acids with air as the oxygen source and displayed wide applicability for the oxidation of both aromatic and aliphatic alcohols. Based on the controlled experiments, the protective effect of N-doped carbon structure and the synergistic effect between Co core and Co 3 O 4 species guaranteed the high reaction conversion and selectivity. Benefitting from heterogeneity and magnetism of the catalyst, it can be easily recycled and reused for long-term stability. Reasonable mechanisms of selective oxidation reaction were proposed through EPR analysis and controlled experiments. The present work provides a facile strategy for potential large-scale preparation of heterogeneous catalyst for sustainable and green catalytic transformations.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2022
·
IF 8.91
Tong Zhu,Jinping Jiang,Jisheng Wang,Zhening Zhang,Jiao Zhang,Jing Chang
A magnetic FeCo 2 O 4 /Co 3 O 4 nanocomposite was successfully synthesized by a facile hydrothermal method as an efficient activator for persulfate (PS) activation to degrade tetracycline (TC) in an aqueous solution. TC removal and mineralization efficiencies reached up to 91.63% and 43.57% in 120 min in the FCC-3/PS system, respectively. The mixed-valence of Fe/Co in the nanocomposite catalyst was beneficial for electrons transfer between Co and Fe elements and enhanced the redox circulation of Fe and Co in between divalent and trivalent. Surficial analysis and phosphate adsorption test confirmed the existence of –OH groups on the surfaces of FeCo 2 O 4 /Co 3 O 4 nanocomposite. Fe/Co redox and surficial hydroxyl in the catalyst played significant roles in the TC potentiation degradation, which was contributed by the plenty of adsorbed –OH groups and excellent dispersity of FeCo 2 O 4 in the FeCo 2 O 4 /Co 3 O 4 composite. The sulfate radicals were major species followed by the hydroxyl radicals , and the surficial adsorbed hydroxyl made great contributions to radical generation. The cycling test and intermediate toxicity analysis indicated that the nanocomposite was considered stable and practicable in water treatment . This work demonstrated that the FeCo 2 O 4 /Co 3 O 4 nanocomposite was an effective and environ-friendly catalyst towards PS activation for removing organic pollutants from water.
✓ 已验证
产品关联
DOI
PubMed
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.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Yujie Ma,Mingshi Deng,Xuefeng Wang,Xinghua Gao,Haixiang Song,Yongheng Zhu,Lingyan Feng,Yuan Zhang
A type I nitroreductase-mimicking nanocatalyst based on 2H–MoS 2 /Co 3 O 4 nanohybrids for trace nitroaromatic compounds detection is reported in this work. For the preparation of nanocatalyst, ultrathin Co 3 O 4 nanoflakes array was in-situ grown onto 2H–MoS 2 nanosheets forming three-dimensional (3D) nanohybrid with large specific surface area as well as abundant active sites. The as-prepared nanocatalyst shows a specific affinity as well as high catalytic activity towards nitroaromatic compounds. Given the favorable nitroreductase-mimicking catalytic activity of 2H–MoS 2 /Co 3 O 4 nanohybrid, a sensitive and efficient electrochemical microsensor has been constructed for the detection of 2, 4, 6-trinitrotoluene (TNT). Under optimized conditions, the microsensor displayed sensitive response from μM to pM levels with a limit of detection (LOD) of 1 pM. We further employed photoelectron spectroscopy (XPS) analysis and high-performance liquid chromatography tandem mass spectrometry (HPLC-MS/MS) method to identify the nitroreductase-mimicking mechanism of 2H–MoS 2 /Co 3 O 4 nanohybrids towards 2, 4, 6- TNT. It was found that the abundant oxygen vacancies in ultrathin Co 3 O 4 nanoflakes played an essential role in determining its catalytic performance. Moreover, the developed MoS 2 /Co 3 O 4 nanozyme has a lower Michaelis-Menten constant (k m ) than that of nature nitroreductase demonstrating a good enzymatic affinity towards its substrates, and further generating a high catalytic activity. This research not only proposed a new type of nanozyme, but also developed a portable electrochemical microsensor for the detection of 2, 4, 6-TNT.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Jiang Zhao,Caidong Zheng,Jing Gao,Jiahao Gui,Licheng Deng,Yanyan Wang,Rongqing Xu
Developing flexible and wearable enzyme-free biosensors for detecting glucose is indispensable for preliminary diabetes diagnosis and human healthcare monitoring. Herein, an innovative flexible Co 3 O 4 nanoparticles uniformly embedded in 3D porous laser-induced graphene (Co 3 O 4 NPs-LIG) electrode is fabricated by a new one-step laser direct writing carbonization technique. The hybrid electrode featuring the remarkable synergistic effect on account of the excellently conductive LIG and multiple high activation sites of Co 3 O 4 NPs can enhance charge transfer, thereby boosting glucose sensing performance. Benefit from the dramatic properties, the proposed flexible non-enzymatic glucose biosensor exhibits a prominent glucose sensitivity of 214 μA mM –1 cm –2 , an extremely low limit of detection of 0.41 μM, a wide linear detection of 1 μM to −9 mM, and a fast response time within 0.49 s. Additionally, impressive repeatability, favorable stability, and great selectivity are achieved in the detection of glucose concentration . Finally, a possible sensing mechanism of the glucose biosensor is also discussed based on the First principles. This study provides a novel and facile strategy for constructing heterostructure of transition metal oxide NPs embedded in LIG, which serves to develop flexible and wearable highly sensitive enzyme-free biosensors for detecting glucose in the near future.
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 151
·期 12
·3437-3450
·
IF 3.186
Bao Er-Peng,Dong Ruichen,Zhang Shuoqing,Li Huan,Zhang Weiguo,Zou Jijun,Xu Qiang
The photocatalysis is a very promising technique to address the serious issues of environmental pollution. Among the common photocatalysts, the graphitic carbon nitride (g-C 3 N 4 ) is widely used for the photodegradation of organic pollutants due to its proper band structure. To further improve the photocatalytic performance of g-C 3 N 4 , a novel composite photocatalyst of Co 3 O 4 /PT-C 3 N 4 has been prepared by using a one-pot calcination method, in which cobalt tetroxide (Co 3 O 4 ) nanoparticles as the cocatalyst are introduced on the surface of rectangular hollow g-C 3 N 4 substrate (PT-Co 3 O 4 ). As a result, the obtained composite photocatalyst (Co3O 4 /PT-C 3 N 4 ) delivers an excellent photodegradation performance for diesel oil under a simulated sunlight, which can improve the separation efficiency of the photo-induced electron–hole pairs. The Co 3 O 4 /PT-C 3 N 4 composite photocatalyst exhibits a high degradation efficiency of 96.27% after 2 h of visible light, which is much higher than that of the PT-C 3 N 4 photocatalyst. Moreover, the composite photocatalyst can still maintain a high photodegradation efficiency after 10 cycles, exhibiting an excellent cyclic stability. The photo-induced carriers generated by the Co 3 O 4 /PT-C 3 N 4 composite photocatalyst follow the Z-scheme heterojunction transfer mechanism. This work gives a fresh idea for the exploration of new high-performance photocatalyst for the treatment of organic environmental pollutants. Graphical Abstract
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Mingjie Sun,Shuai Guo,Ziling Wang,Lu Zou,Bo Chi,Jian Pu,Jian Li
It is crucial to design effective cathode catalysts for high performance of Li–O 2 batteries (LOBs). Herein, porous LaCo 0.6 Ni 0.4 O 3 nanofibers decorated with ultrafine Co 3 O 4 nanoparticles (Co 3 O 4 @LCN NFs) are designed and employed as cathode catalyst for LOBs. The X-ray photoelectron spectroscopy measurement results suggested that uniform dispreading of Co 3 O 4 nanoparticles on LCN NFs surface could largely increase the surface chemisorbed oxygen, resulting in enhanced catalytic activity. Furthermore, with the assistance of Co 3 O 4 nanoparticles, Co 3 O 4 @LCN NFs can significantly facilitate O 2 adsorption and diffusion, Li 2 O 2 nucleation/decomposition and the formation of tiny sheet-like Li 2 O 2 , thereby achieving a low charge overpotential. A high specific capacity of 11,288 mA h g −1 , a low charge voltage plateau of 3.72 V at first cycle and excellent cycle stability of 116 cycles at 1000 mA g −1 are obtained for LOBs with Co 3 O 4 @LCN NFs.
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2020
·Vol. 5
·期 1
·259-267
·
IF 6.788
Hang Yang,Hui Sun,Xiaochen Fan,Xiaozhong Wang,Qingfeng Yang,Xiaoyong Lai
Rational design and preparation of advanced electrocatalysts for the oxygen evolution reaction (OER) are highly desirable, where various strategies have been applied to enhance the electrocatalytic activities, such as developing nanostructures, facet control, and creating oxygen vacancies. Herein, we have successfully integrated multiple strategies into one catalytic system for further enhancing the OER performance. A series of hollow Co3O4 dodecahedrons with controlled crystal orientation and oxygen vacancies were prepared by using ZIF-67 as a precursor and adjusting the atmosphere during calcination. Hollow Co3O4 dodecahedrons with both controlled exposure of the (111) facets and high content of oxygen vacancies showed an excellent OER performance with an overpotential of 307 mV at 10 mA cm−2 and a Tafel slope as low as 55 mV dec−1 and significantly superior to its counterpart with low content of oxygen vacancies or a broken Co3O4 dodecahedron being ground and losing the preferred facets of (111). The excellent OER performance should be attributed to the unique hollow structure and the effective control of the (111) facets and oxygen vacancies, which allows for more highly active sites and enhanced conductivity.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Meimei Wang,Yunke Cui,Hongyang Cao,Ping Wei,Chen Chen,Xiuyan Li,Juan Xu,Guoping Sheng
In this study, zeolitic imidazolate framework-67 (ZIF-67) derived Co 3 O 4 /NiCo 2 O 4 double-shelled nanocages (DSNCs) were fabricated and utilized as catalysts to activate peroxydisulfate (PDS) for bisphenol A (BPA) degradation. The results showed that Co 3 O 4 /NiCo 2 O 4 DSNCs exhibited superior BPA degradation performance over Co 3 O 4 NCs and NiCo 2 O 4 NCs. PDS combined with the interfaces of both the Co 3 O 4 inner shell and NiCo 2 O 4 outer shell to form complex, inducing the nonradical oxidation of BPA by electron abstraction. The double-shelled hollow structure helped to increase the instantaneous concentration of reactants in the void space of Co 3 O 4 /NiCo 2 O 4 DSNCs, thus promoting the decomposition of BPA. The Co 3 O 4 /NiCo 2 O 4 DSNCs had high selectivity for BPA degradation and were resistant to halogens and background organic matter in wastewater. Our work indicated that metal-organic framework (MOF)-derived nanomaterials with a hollow structure have a promising application prospect for persulfate-based advanced oxidation technology.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）