JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Qipu Ma,Yuyao Zhang,Xiaoying Zhu,Baoliang Chen
Reducing the agglomeration of nano-catalysts to retain the active catalytic sites is crucial for the advanced oxidation processes (AOPs) of peroxymonosulfate activation in wastewater treatments . Herein, Co 3 O 4 hollow multi-shelled structures (HoMSs) were successfully prepared as the nanoreactors to reduce the agglomeration of nano-catalysts in catalytic reaction . Compared with single-shelled and double-shelled Co 3 O 4 HoMSs, triple-shelled Co 3 O 4 HoMSs (TS-Co 3 O 4 ) exhibited best catalytic performance and the carbamazepine (5 mg L −1 ) degradation reached 100% within 30 min. The hollow multi-shelled structures showed a significant role in reducing the agglomeration of catalysts. The value of hydrodynamic diameter/true particle size of TS-Co 3 O 4 was 1.58, which meant TS-Co 3 O 4 could be regarded as a single dispersion or two together in aqueous solution. The shells of TS-Co 3 O 4 supported each other and outer shells could protect the inner ones, hence the stability increased. Besides, the hollow cavity between shells reduced the mass diffusion resistance and increased the contact of reactants with active sites. Mechanism studies showed sulfate radicals (SO 4 •– ) played a leading role in the degradation of carbamazepine. This work provided an effective way to reduce the agglomeration and retain the active sites of cobalt-based catalysts in AOPs, so as to balance the conflict between the reactivity and stability of nano-catalysts.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Hefeng Yuan,Shumin Wang,Zizai Ma,Manab Kundu,Bin Tang,Jinping Li,Xiaoguang Wang
Developing earth abundant electrocatalyst is imperative to large-scale hydrogen production for transforming current fossil fuel-based economy into future renewable energy economy. In this paper, we report the synthesis of self-supported V O B-Co 3 O 4 /NF nanowire arrays directly grown on Ni foam, which can serve as a trifunctional catalyst for producing hydrogen and oxygen by electrolyzing water in alkaline media or producing hydrogen via hydrolyzing alkaline NaBH 4 solution. The engineered boron and oxygen defects in Co 3 O 4 nanowires prove to effectively modulate their electronic structure leading to the increased electrical conductivity and create a large quantity of electroactive sites. The resulting self-supported V O B-Co 3 O 4 /NF electrode delivers a current density of 50 mA cm −2 at overpotentials of 184 mV for hydrogen evolution reaction (HER) and 315 mV for oxygen evolution reaction (OER) in 1.0 M KOH with excellent stability and durability. The V O B-Co 3 O 4 /NF as both cathode and anode requires 1.67 V to achieve a current density of 10 mA cm −2 for overall water splitting reaction. Besides, V O B-Co 3 O 4 /NF presents much higher hydrogen generation rate (HGR) of 7055 mL min −1 g catalyst −1 with activation energy (E a ) of ca. 29.7 kJ mol −1 . for hydrolytic dehydrogenation of alkaline NaBH 4 solution, outperforming most of the reported non-noble metal-based catalysts and even precious metal catalysts.
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Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 30
·6459-6468
·
IF 5.344
Xiaodan Zhang,Yuwan Lu,Qiumeng Chen,Yuming Huang
A self-templated strategy was adopted to design hollow Co3O4/MO3 (M = Mo, W) mixed-metal oxides via the Mo or W doping of ZIF-67, and subsequent pyrolysis under an atmosphere of air at a low temperature of 450 °C. The hollow Co3O4/MO3 (M = Mo, W) mixed-metal oxides displayed tunable oxidase-like and peroxidase-like activities able to efficiently catalyze the oxidation of TMB to generate a deep blue color in the absence or presence of H2O2. Relative to that of the un-doped Co3O4, the oxidase mimic activity of the Mo-doped Co3O4 increased to 1.3 to 2.1-fold, while its peroxidase mimic activity increased to 7.1 to 19.9-fold, depending on different Mo doping amounts. The oxidase mimic activity of the W-doped Co3O4 increased to 2.1 to 2.3-fold, while its peroxidase mimic activity increased to 4.8 to 5.9-fold, depending on the different W doping amounts. The Mo- and W-doped Co3O4 nanohybrid exhibited both higher O2 and H2O2 activating capability, and their H2O2 activating capacity was superior to the O2 activating capability. Furthermore, the Mo- and W-doped Co3O4 nanohybrids exhibited similar O2 activating abilities, while the Mo-doped one displayed a higher H2O2 activating capability than the W-doped one. The discrepant peroxidase-like nature of Mo- and W-doped Co3O4 nanohybrids is likely attributed to their different catalytic mechanisms. The peroxidase-like activity of Mo-doped Co3O4 is highly related to the ˙OH free radical, while that of W-doped Co3O4 is likely ascribed to the electron transfer between TMB and H2O2. The Km values of Co3O4/MoO3 for TMB and H2O2 were 0.0352 mM and 0.134 mM, which were 3.2- and 1.9-fold lower than that of pure Co3O4, respectively. A Co3O4/MoO3-based colorimetric platform was developed for the determination of H2O2 in the 0.1–200 μM range, with a limit of detection of 0.08 μM (3σ). Based on the thiocholine (TCh) inhibition of the excellent peroxidase-like activity of Co3O4/MoO3 and the TCh generation via acetylcholinesterase (AChE) catalyzed hydrolysis of acetylthiocholine chloride (ATCh), the colorimetric platform was extended to screen AChE activity and its inhibitor.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 46
·65487-65498
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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.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Zhiwei Zhao,Junyu Fan,Xiaoyong Deng,Jie Liu
In this study, Co 3 O 4 quantum dots decorated phosphorus-doped g-C 3 N 4 nanosheets was synthesized though one-step thermal polymerization method using vitamin B12 (VB12) as precursor of cobalt and phosphorus mixed with melamine. The prepared photocatalysts were characterized by X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR), BET, transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (DRS), photoluminescence (PL) and electrochemical measurements. Appropriate amount of introduced VB12 can improve photocatalytic activities while excess caused inhibition. The sample with the weight ratio of VB12 in precursors at 1% exhibited the optimum photodegradation efficiency for metronidazole (MTZ), about 2 times as higher as the removal rate of pure g-C 3 N 4 . Several effects on the photocatalytic activity was also investigated and the results showed that enough dissolved oxygen and presence of Fe 3+ was found to promote MTZ photodegradation, while NO 3 − , Ca 2+ and HCO 3 − would inhibit it. Superoxide radical O 2 − was identified as the dominate active specie in photodegradation process and possible enhancement mechanism of introduced VB12 for photocatalytic activities was proposed. It was inferred that the synergistic effect of generated Co 3 O 4 quantum dots and P-doped g-C 3 N 4 , including increasing the separation efficiency of photo-inducted electrons and holes, inhibiting the recombination process of them and decreasing the band gap energy, could be the reason for the better photocatalytic activity. At last, MTZ degradation pathway in the photosystem was determined.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yudi Wang,Xinyi Shen,Sainan Sun,Xinyun Li,Jiayi Gao,Yifan Shao,Shi-Wen Lv,Yanqing Cong
Heterogeneous persulfate-based advanced oxidation processes (PS-AOPs) have been regarded as one of the most promising methods in the treatment of wastewater containing antibiotic. Herein, the Co 3 O 4 /NiO composite with built-in electric field is prepared. The existence of built-in electric field can reduce the interface resistance and accelerate the charge transfer, promoting the electron transfer between the Co 3 O 4 /NiO composite and peroxymonosulfate (PMS). Meanwhile, built-in electric field can induce the formation of electron-deficient and electron-rich active areas. With built-in electric field intervention, the activation pathway of PMS over Co 3 O 4 component with electron-deficient area of Co 3 O 4 /NiO is transformed from radical to 1 O 2 , while electron-rich area makes NiO component that has no ability can activate PMS producing SO 4 •− and OH • . As a result, the Co 3 O 4 /NiO composite can effectively activate PMS to realize the rapid degradation of tetracycline. More significantly, a micro reactor equipping with Co 3 O 4 /NiO composite not only displays high removal efficiency of total organic carbon (TOC), but also improves the biodegradability of wastewater containing antibiotic. In short, current work not only clarifies the role of built-in electric field in PMS activation, but also shares some valuable insights into the application of PS-AOPs in practical engineering.
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Sustainable Materials and Technologies
·
2024
·
IF 8.6
Lei Guo,Yan-He Chen,Li-Mei Xu,Xiao-Lu Chen,Jin-Qiu Shen,Jian-Yong Zhang,Zhen-Jiang Liu
Herein, a fern-like p-n heterojunction by anchoring Ni 3 Fe-LDH nanoplates onto Co 3 O 4 nanoneedles have been optionally constructed. Essentially, p-n heterojunction ensured to induce strong built-in electric field, and inherit interfacial electron redistribution. Based on their compatible and well-matched electronic band structures, a staggered type-II photo-generated electron/holes transfer pathway have been elaborated by density functional theory calculation (DFT), in situ irradiation X-ray photoelectron spectroscopy (XPS), and fluorescent decay. This band bending and charge migrating module conferred the architecture with strong redox ability, sufficient exciton dissociation, and admirable optoelectronic characteristics. Moreover, the heterostructure acquired broad absorption spectrum to exhibit outperforming photocatalytic effect. Totally, this electron redistribution at the hierarchical interface, a type-II scheme charge-transfer pathway and the oxygen defects would lead to high efficiency in solar light assisted N 2 reduction. Typically, Co@Ni 3 Fe-2 catalyst exhibited the highest NH 3 production rate of 16.15 μg h −1 mg cat. −1 and Faraday efficiency (FE) of 31.57% at −0.6 V vs. RHE in 0.1 M Na 2 SO 4 solution. Fortunately, with light exposure, the NH 3 production rate and FE could increase by 27.9% and 18.1% than that under dark. This work would provide a plausible attitude towards the design of high efficient photocatalyst for artificial photosynthesis with multi-functionalized coupling effect.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Xuesheng Wang,Yi Shao,Chunxia Yao,Liujuan Huang,Wei Song,Xianli Yang,Zhijie Zhang
The overuse of antibiotics has caused the emergence of drug-resistant bacteria and even superbugs, which makes it imperative to develop promising antibiotic-free alternatives. Herein, a multimodal antibacterial nanoplatform of two dimensional/two dimensional (2D/2D) mesoporous Co 3 O 4 /BiOCl nanocomposite is constructed, which possesses the effect of “kill three birds with one stone”: (1) the use of mesoporous Co 3 O 4 can enlarge the surface area of the nanocomposite and promote the adsorption of bacteria; (2) Co 3 O 4 displays remarkable full-spectrum absorption and photo-induced self-heating effect, which can raise the temperature of Co 3 O 4 /BiOCl and help to kill bacteria; (3) the p-type Co 3 O 4 and n -type BiOCl form a p-n heterojunction, which promotes the separation of photoelectrons and holes, thus producing more reactive oxygen species (ROS) for killing bacteria. The synergism of mesoporous structure, photothermal effect and photocatalytic ROS makes the developed Co 3 O 4 /BiOCl a promising antibacterial material, which shows outstanding antibacterial activity with an inhibition rate of nearly 100 % against Escherichia coli (E. coli) within 8 min. This work provides inspiration for designing multimodal synergistic nanoplatform for antibacterial applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Menglu Zhang,Yueping Bao,Li-an Hou,Xiaoqiang An,Yiran Chai,Chuyang Y. Tang,Yiqun Fan,Yu Yang
This study presents a novel Co 3 O 4 /g-C 3 N 4 functionalized ceramic membrane (Co-CN-M) for emerging contaminants removal by integrating visible-light photocatalysis and peroxymonosulfate oxidation. The membrane was fabricated via in-situ growth of ZIF-67 on g-C 3 N 4 -modified substrates followed by calcination. The Co-CN-M overcomes the conventional trade-off between reactivity and permeability, simultaneously achieving outstanding degradation efficiency ( k = 0.24 min −1 for bisphenol A) and ultrahigh water flux (724 L·m −2 ·h −1 ·bar −1 ). This exceptional performance stems from: (1) the p-n heterojunction at g-C 3 N 4 /Co 3 O 4 interface that enhances charge transfer and Co 2+ /Co 3+ cycling, promoting h + /O 2 ·− -dominated degradation; and (2) a unique honeycomb morphology that facilitates mass transfer via enhanced surface properties and internal nanochannels. Application viability was also demonstrated by excellent antifouling and self-cleaning properties (>70 % flux recovery) and stable long-term (96 h) operation in surface water with minimal cobalt leaching (<0.007 mg·L −1 ). This work offers valuable insights into metal-organic framework (MOF)-based functional membrane fabrication for effective water purification.
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Journal of Biomedical Nanotechnology
·
2022
·Vol. 18
·期 6
·1585-1595
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IF 3.641
Chen Ben-Qi,Yang Meng,Liao Wen-Chun,Li Zi-Ying,Chen Zhi-Xiong,Yang Yun-Hui,Yang Tong,Hu Rong
Developing a strategy for the determination of trace ochratoxin A (OTA) in food is very important to ensure food safety. Here, based on a tripod probe, an electrochemical aptasensing platform for detected OTA sensitively was designed, which used the 3D DNA walker by endonuclease Nb.BbvCI
powered and the nanozyme of porous Co3O4 nanodisks loaded Pt nanoparticles (Pt NPs@Co3O4) as a cascaded signal amplifying device. With OTA as a model target, the swing-arm probe of DNA walker was triggered. Next, probe on the magnetic beads was cleaved
and released by Nb.BbvCI to realize the first signal amplification. After that, the partial sequence of the released probe is well assembled with triple-strand DNA by strand reaction and the other sequence exposed as a capture probe was combined with the Pt NPs@Co3O4.
It can efficiently make the decomposition of H2O2, bring about significant current, and the signal was amplified again. The designed electrochemical aptasensor demonstrated outstanding detection linearity in the OTA concentration range of 1 pg/mL to 100 ng/mL, with a
detection limit of 0.194 pg/mL (S/N = 3), with excellent reproducibility and high specificity. It can be used to find OTA in food. This research supplies a potential split-new avenue for the sensitive detection of electrochemical aptasensor.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Zhichao Shang,Man Zhang,Jingjing Qu,Sanjith Udayakumar,Xintan Bai,Xiaohong Wang,Baojing Zhang,Jianzhong Wang,Farshid Pahlevani,Peizhong Feng
Chemical/electrochemical dealloying was applied to porous CoAl intermetallic (IMC) precursors synthesized via a rapid thermal explosion (TE) method, producing Co 3 O 4 (O V ) self-supported materials with rod-like, nano-flower, and honeycomb-like nanostructures. The investigation thoroughly explored the phase composition, exothermic behavior, precursor morphology, electrochemical characteristics of the dealloyed products, and the mechanism of oxygen vacancies that influence the performance of supercapacitors. The diffusion of intermediate phases governs the exothermic behavior and structural integrity of the CoAl IMC precursors, formatting a precursor with a porous material featuring a 3D microstructure. The effect of dealloying time, temperature and, applied potential on the nanostructure of the sample was examined, ultimately enabling the controlled synthesis of nano-flower Co 3 O 4 (O V ) in the dealloying process. The synthesized self-supported Co 3 O 4 (O V ) materials with a relatively high concentration of oxygen vacancies and a high specific surface area (36.69 m²/g). The materials showed high capacitance (11.25 F/cm 2 at 10 mA/cm 2 ) and exceptional cyclic stability (the decay rate per cycle is 0.013 % at 20 mA/cm 2 after 2000 cycles). DFT simulations demonstrated that the O V creates additional unsaturated coordination sites, enhancing the storage capacity by facilitating ion insertion and extraction, thus significantly boosting the specific capacity.
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Journal of Cleaner Production
·
2022
·
IF 11.072
Yuntai Xi,Fang Dong,Zhongying Ji,Zhicheng Tang,Jiyi Zhang
The shortcomings of Co-based powder catalysts such as amorphous susceptibility to loss and high influence by pressure drop have become the key factors affecting their catalytic activity. In this paper, two methods were proposed to prepare novel monolithic Co 3 O 4 /SiO 2 catalysts by 3D direct ink writing (DIW) technology: (1) one-step method of printing the active component with supports, (2) two-step method of printing the support first, and then loading the active components. The results showed that the monolithic catalyst prepared by the two-step method possessed more abundant Co 3+ and lattice oxygen (O latt ) species than the one-step method, which jointly promoted the catalytic conversion of toluene. However, the catalyst printed by the one-step method had a stronger interaction between the active component and the support, showing better thermal stability and water resistance. In addition, the SiO 2 support (the calcined product after SiO 2 ink printing) enhances the activity, stability, compression resistance, while the N–SiO 2 support (the calcined product after SiO 2 precursor ink printing) can effectively prevent blockage of the pore structure by the binder and increase physical properties such as pore volume and specific surface area of Co 3 O 4 /SiO 2 catalyst.
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