INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Xinxin Zhang,Shiyang Cheng,Wei Zhang,Cai Zhang,Nicholas E. Drewett,Xiyang Wang,Dong Wang,Seung Jo Yoo,Jin-Gyu Kim,Weitao Zheng
Ag/Pr6O11 catalysts supported by either Pr6O11 nanorods (Pr6O11-NRs) or nanoparticles (Pr6O11-NPs) were prepared by conventional incipient wetness impregnation. The nanocomposite of Ag/Pr6O11-NRs demonstrated a higher catalytic activity for CO oxidation than Ag/Pr6O11-NPs at lower temperatures. This improved performance may be ascribed to the mesoporous features and resultant oxygen vacancies of the Pr6O11 nanorods support, as well as the large surface area and homogeneous loading of Ag species. As a result, 98.7 and 100% CO conversions were achieved at 210 and 240 °C for Ag/Pr6O11-NRs, while Ag/Pr6O11-NPs require a temperature of 320 °C to obtain the 100% CO conversion rate. These findings reveal that Pr6O11-NRs is the preferable support, comparative to Pr6O11-NPs, for Ag/Pr6O11 catalysts, for CO oxidation.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 9
·5793-5806
·
IF 4.186
Sheng Wu,Quan Liu,Mikhail G. Brik,Puxian Xiong,Dong Wang,Guoxing Zhang,Yan Chen
Developing environment-friendly dual-emission phosphors of both blue–cyan and deep-red lights is desirable for the utilized indoor plant lighting research. Notably, the naked 6s and 6p Bi 3+ ions are sensitive to the lattice sites, which emit from Ultraviolet (UV) to red lights in various crystal compounds. Meanwhile, the 2 E → 4 A 2g transition of Mn 4+ ions promises its deep-red light emissions, which satisfies the demand for specific wavelength lights for plants growth. Hence, a Bi 3+ /Mn 4+ co-doped Sr 2 LaGaO 5 : Bi 3+ , Mn 4+ (SLGO:Bi 3+ :Mn 4+ ) phosphor was finally synthesized. The phase, micromorphology and luminescent properties were systematically evaluated. Upon excitation at 350 nm light, dual emissions of both blue–cyan (470 nm) and deep-red (718 nm) lights were observed. Besides, due to the pronounced photoluminescence (PL) spectral overlap between Bi 3+ and Mn 4+ ions, a potential energy transfer process from Bi 3+ to Mn 4+ ions was confirmed. The relative PL intensities between Bi 3+ and Mn 4+ ions can be tuned just by adjusting the Mn 4+ ion concentration. Besides, Li + co-doping has been evidenced to improve the deep-red emissions (718 nm) of SLGO:0.005Mn 4+ due to charge compensation and rationally designed lattice distortion, together with the improved thermal stability. Finally, the emissions of SLGO:Bi 3+ , Mn 4+ , Li + phosphor suit properly with the absorption of the four fundamental pigments for plant growth, indicating that the prepared phosphorescent materials may have a prospect in plant light-emitting diodes lighting.
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Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2024
·
IF 2.1
KeJian Xu,XiangYun Zhao,JiaFu Yu,QinYa Nong,Hao Qian
Poly(acrylonitrile-co-styrene) microspheres are utilized in several applications due to their superior mechanical properties, excellent chemical stability, and tunable surface modification. In this work, poly(acrylonitrile-co-styrene) microspheres were synthesized in ethyl acetate usingreflux precipitation polymerization. The average particle size and morphology of microspheres were carefully measured to investigate the responding influencing factors. In the growth process of these microspheres, the average particle size of poly(AN-co-St) microspheres changed a little after 180 min. However, the yield of the microspheres continued to increase until 420 min. The properties of the solvents had a significant impact on both the average particle size and the morphology of the poly(AN-co-St) microspheres. The concentrations of the initiator and the cross-linker have minimal effect on the average particle size of poly(AN-co-St) microspheres. By controlling the monomer content at 25 wt%, the yield of these microspheres could reach 82%. The method is straightforward to operate andthe prepared microspheres exhibithigh sphericity and uniformity. As a result, it shows great promise for thepreparation of submicron poly(AN-co-St) microspheres.
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Catalysts
·
2024
·Vol. 14
·期 9
·578
·
IF 3.8
Yanmin Zhang,Yu Liu,Rui Zhao,Bin Lu,Xuan Wang,Hengshan Qiu
Copper-based catalysts are widely applied in catalytic CO conversion. Despite their importance in determining catalytic performance, the interaction of CO with different copper states has often been the subject of debate. Herein, we discuss the preparation of four different CuOxstates (namely, fully oxidized and reduced (O-573 and R-573, respectively) and 800 and 1000 K annealed (A-800 and A-1000, respectively)) through in situ treatments, comparing CO adsorption behaviors with vacuum-transmission IR spectroscopy. CO only weakly adsorbed on the A-1000 and R-573 surfaces, whereas it led to the creation of trace amounts of surface oxygen vacancies over the O-573 surface, providing adsorption sites for the subsequent CO. Meanwhile, the produced CO2re-adsorbed on the catalyst to form carbonate species. The reduction process was notably promoted over A-800 due to the presence of abundant surface oxygen vacancies, demonstrating the key role of Cuδ+in oxygen vacancies, rather than merely its chemical state, in dominating the interaction of CO with CuOx.
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JOURNAL OF MOLECULAR RECOGNITION
·
2019
·Vol. 33
·期 3
·e2820
·
IF 1.919
Jiajia Han,Longfei Miao,Yonghai Song
Co-Co 3 O 4 /carbon nanotube/carbon foam (Co-Co 3 O 4 /CNT/CF) nanocomposites were prepared by soaking melamine foam into a solution of Co(NO 3 ) 2 ·6H 2 O, followed by calcination in N 2 and air in sequence. The obtained Co-Co 3 O 4 /CNT/CF nanocomposites were characterized with scanning electron microscopy and cyclic voltammetry. It was found that Co 3 O 4 nanoparticles were grown on the external of CF successfully, while CNTs were grown on the surfaces of CF in a large amount, which further improved the electrical conductivity of the. The prepared Co-Co 3 O 4 /CNT/CF nanocomposites were then used to construct nonenzymatic sensor to detect glucose in alkaline solution. The sensor showed detection range from 1.2 μM to 2.29 mM with a detection limit of 0.4 μM (S/ N =3) and a high sensitivity of 637.5 μA −1 cm −2 . The developed sensor also showed an instant response, favorable reproducibility, and high selectivity. The results attest that Co-Co 3 O 4 /CNT/CF composites have great potential in the development of nonenzymatic sensors for glucose.
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RSC Advances
·
2019
·Vol. 9
·期 44
·25677-25689
·
IF 3.049
Renjie Gu,Xuelei Li,Kunpeng Cheng,Lixiong Wen
A micro-impinging stream reactor (MISR) consisting of a commercial T-junction and steel capillaries, which is of intensified micromixing efficiency as compared with traditional stirred reactors (STR), was applied for the preparation of Co and Al co-doped Ni(OH)2 nanocomposites and their modification with reduced graphene oxide (RGO). The co-precipitation preparation process was conducted under precisely controlled proportions and concentrations of reactants in the MISR. Therefore, element analysis showed a higher uniform distribution of metal ions within the nanocomposites obtained through the MISR. The structural characterization and electrochemical measurements also showed that the MISR-prepared metal-doped nanocomposites were of more uniform dispersion and superior electrochemical performance than those prepared with STR. In addition, by modifying with RGO in the MISR, the electrochemical performance of Co and Al co-doped Ni(OH)2 nanocomposites could be further improved. The Co and Al co-doped Ni(OH)2/RGO prepared under optimal conditions achieved an ultrahigh specific capacitance of 2389.5 F g−1 at the current density of 1 A g−1 and displayed an excellent cycling stability with 83.7% retention of the initial capacitance after 1000 charge/discharge cycles in 6 M KOH aqueous solution.
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PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Shuang Liu,Chao Liu,Hejiao Zhang,Weizhen Zhang,Wei Ding,Huaili Zheng,Hong Li
The sulfite (S(IV))-based advanced oxidation process (AOP) has emerged as an appealing alternative to the traditional persulfate-based AOP for the elimination of organic contaminants from diverse water matrices. In this work, a silica reinforced ZIF-67(Co) catalyst (CZS) is fabricated, characterized and tested in the activation of S(IV) for the sulfamethoxazole (SMX) degradation. The prepared CZS demonstrates superior stability and catalytic ability for the degradation of SMX compared to ZIF-67(Co) across a broad pH range. Unlike the conventional radical-dominated oxidation systems, the CZS/S(IV) system for SMX degradation operates through a non-radical mechanism, featuring high-valent Co(IV) and singlet oxygen ( 1 O 2 ) as the predominated reactive species. The hydroxylated Co species exposed on the CZS surface is identified as the pivotal active site, realizing the S(IV) activation through a complexation-electron transfer process, resulting in the production of various reactive intermediates. Co(II) undergoes the conversion to Co(IV) by generated HSO 5 − , and 1 O 2 predominantly originates from the intermediate SO 4 •− . Profiting from the highly selective oxidation capacities of Co(IV) and 1 O 2 , the established oxidative system demonstrates a remarkable interference resistance and exhibits an exceptional decontamination performance under real-world water conditions. In short, this work provides a sustainable S(IV)-based oxidation strategy for environmental remediation via non-radical mechanism.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yang Wang,Lei Zhang
In order to eliminate multiple coexisting pollutants in environmental wastewater, a magnetic three-dimensional hierarchical porous flower-like N, Co-doped graphitic carbon nano-polyhedra decorated NiCo-layered double oxides (N-Co@C/NiCo-LDOs) adsorption material was synthesized, which consisted of two-dimensional LDOs nanosheets with functionalized surfaces (N, Co-doped graphitic carbon loaded on both sides of NiCo-LDOs nanosheets). The adsorption properties of N-Co@C/NiCo-LDOs for five types of typical pollutants (cationic dyes: rhodamine b, methylene blue ; pesticides: ethofenprox, bifenthrin ; anionic dyes: methyl orange, congo red; inorganic cations : Cr 2+ , Cd 2+ , Pb 2+ , Zn 2+ , inorganic anions : Cr 2 O 7 2− , AsO 3 3− ) were investigated systematically in single and coexisting systems. Combined with the results of FTIR and zeta potential , the adsorption mechanism was discussed. By virtue of its hierarchical porous architecture and the combined effect of functionalized surfaces and LODs supporter, the as-prepared N-Co@C/NiCo-LDOs demonstrates excellent adsorption performance towards five types of typical pollutants with fast adsorption rate, high adsorption capacity and good co-adsorption performance. More importantly, the N-Co@C/NiCo-LDOs showed satisfactory removal efficiency, stability and reusability in model wastewater. The broad-spectrum, rapid, easily separable, and reusable adsorption properties make N-Co@C/NiCo-LDOs promising for highly efficient wastewater treatments . This work also provides a feasible way for the preparation of adsorption materials for the treatment of complex wastewater systems.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Guocui Cai,Helong Jiang,Fangyi Chu,Xiangcun Li,Xiaobin Jiang,Xiao Wu,Gaohong He,Yan Dai
Here, the conventionally disordered Co(OH)F filaments are rearranged to form highly-ordered flower-like Co(OH)F architectures in a conductive membrane substrate. The important findings contribute to designing delicate nanostructures and improving the catalytic activity of advanced materials for energy applications. The hierarchically porous CNT@NC membrane with CNT as the core and N -doped carbon as the crosslinking shell is scalably designed firstly for strengthening the transport of Li + and electrons in the electrode, providing an ultrahigh porosity for growing flower-like Co(OH)F on both surfaces and interior of the membrane, as well as offering electrons for the redox reactions through the roots of the Co(OH)F flowers. Furthermore, the ordered Co(OH)F bundles with divergent and open-ended structures provide the catalyst with the broad reaction interface and active sites for polysulfides (LiPSs) anchoring and catalytic conversion at a low energy barrier, significantly facilitating the diffusion of ions and electrolyte in the catalyst, and thus effectively alleviating the shuttle effect. Owing to the synergistic effect between the conductive membrane substrate and the grown Co(OH)F catalyst, the Co(OH)F-CNT@NC cathode generates a high reversible capacity and excellent long-term cycling performance (622 mAh·g −1 at 1C after 600 cycles). Conclusively, the proposed facile strategy provides insights regarding the design of novel cathode materials for high-areal-capacity Li–S batteries.
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yueli Liu,Luxia Shao,Lingling Ding,Xueyi Chen,Yunan Bao,Wen Chen
Single-atom catalysts (SACs) are prone to agglomeration or migration during catalytic processes, making the development of highly dispersible SACs greatly essential for the performance of photocatalytic CO2 reduction. Herein, cobalt-containing keto-enamine covalent organic frameworks (COFs) (Co/TpPa-1) are successfully in situ synthesized by utilizing the interlayer nitrogen atom coordinated with metallic cobalt, which is used to effectively prevent the agglomeration of monometallic atoms to ensure the homogeneous dispersion of SACs in the resulting metalized COFs. In the photocatalytic CO2 reduction, the Co/TpPa-1 composite exhibits significantly enhanced performance compared to the TpPa-1 COFs. The CO yield of 0.05 mM Co/TpPa-1 composite is approximately 414.5 μmol g–1 h–1, representing a two-order-of-magnitude improvement over the TpPa-1 COF catalyst (approximately 4.15 μmol g–1 h–1). Moreover, the 0.05 mM Co/TpPa-1 composite shows 99.45% selectivity for CO and good stability, maintaining a over 97% CO2 reduction rate after four cycles. The reason lies in the fact that the interaction between monatomic Co and TpPa-1 COFs enhances visible light absorption and extends the lifetime of the photogenerated carriers by promoting electron transfer through the loaded monatomic Co. This work provides a new idea for the catalyst synthesis with high performance and high selectivity.
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PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2026
·
IF 4.1
Liang Zhiqi,Cheng Li,Zha Qichun,Chen Lin,Yan Wenting,Jiang Dan,Wu Zhouling
Hydrogen peroxide (H₂O₂), a key reactive oxygen species (ROS) in vivo, plays an important role in host immune defense against pathogen invasion. Abnormal H 2 O 2 levels are associated with various diseases; therefore, accurate and real-time detection of H 2 O 2 is of considerable biomedical relevance. In this study, a composite material consisting of Co,N co-doped porous carbon nanocages (Co,N-PC) and carbon nanotubes (CNTs) was fabricated and exhibited superior electrocatalytic performance toward H 2 O 2 reduction compared with Co,N-PC without CNTs. The synergistic interaction between CNTs and Co,N-PC enhanced the electrical conductivity and electrochemically active surface area of Co,N-PC@CNTs, thereby improving its electrocatalytic activity and non-enzymatic electrochemical sensing performance toward H 2 O 2 . Under optimal conditions, the Co,N-PC@CNTs-modified rotating disk electrode (RDE) exhibited a wide linear concentration range of 0.005–9.5 mM, a high sensitivity of 460.245 μA·mM −1 ·cm −2 , and a low detection limit of 0.060 μM (S/N = 3). Its overall analytical performance surpassed that of the state-of-the-art ZIF-67-derived carbon sensors reported in the literature. Density functional theory (DFT) calculations demonstrated that the introduction of CNTs in conjunction with Co,N-PC effectively modulated the electronic structure and optimized the d-band center, thereby reducing the Gibbs free energy of the rate-determining step, lowering the reaction energy barrier, and accelerating the reaction kinetics. In addition, the sensor exhibited a measurable electrochemical response to H 2 O 2 associated with PMA-stimulated HT29 cells. Therefore, the Co,N-PC@CNTs/RDE sensor provides a promising platform for sensitive H 2 O 2 detection, with potential applications in biological, food, and environmental analysis. Graphical abstract
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Molecular Catalysis
·
2023
·
IF 4.6
Zizheng Zhu,Hongyan Zhang,Wen Guo,Hao Zhou,Yilin Zhou,Wenjie Liang,Maoshuai He,Wenxian Wei,Tingting Yu,Hong Zhao,Tao Yang
The highly efficient catalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are of great significance for electrochemical water splitting. Direct transforming nickel foam (NF) into nickel-based catalysts attracts extensive attention because of its excellent stability and high conductivity. However, the catalytic performances of this kind of catalyst are still far from expected. Herein, we report a series of Ni oxides co-modulated by Mo, V and M ( M =Mn, Fe, Co, Cu) as efficient catalysts for water splitting, which are directly prepared through a simple NF-transformation method. Especially, a MoVNi catalyst displays a low Tafel slope of 68 mV/dec and a small overpotential of 76 mV at 10 mA/cm 2 for HER in 1.0 M KOH solution. The OER performances of MoVNi can be greatly enhanced by M introduction. For example, Fe-MoVNi only requires 374 mV to achieve 100 mA/cm 2 and shows no declination in a-20 h stability test at 100 mA/cm 2 in 1.0 M KOH media. Such performances outperform the recently reported best-performing Ni oxides catalysts in an alkaline environment. The excellent catalytic performances suggest great promise in practical applications.
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