MICROPOROUS AND MESOPOROUS MATERIALS
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2019
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IF 4.182
Chen Yuan,Pengfei Cheng,Jing Li,Xianlu Gao,Xingsen Gao,Xin Wang,Mingliang Jin,Richard Nötzel,Guofu Zhou,Zhang Zhang,Junming Liu
Zeolite imidazolate frameworks (ZIFs) are a novel kind of zeolite materials with regular porous network structures, belonging to mental-organic frameworks (MOFs). Thanks to their high porosity and large specific surface area , ZIFs could have potential applications in the field of photocatalysis . In this paper, visible light responsive photocatalyst of ZIF-67 was synthesized by a one-step hydrothermal method under a mild condition. We explored three organic dyes in aqueous solutions were degraded under visible light irradiation . And corresponding photocatalytic performances of ZIF-67 with controllable synthetic conditions were evaluated systematically. It was found that ZIF-67(9 h) had the highest degradation efficiency. Besides, the ZIF-67(9 h) were heated in Ar can maintain their crystal structure and microporous form, but exposed more sites to improve photocatalytic activity with partial bond breakage . More than 75% methyl orange (MO), 85% methyl blue (MB) and 54% Rhodamine B (RhB) can be degraded with a 0.5 g L −1 ZIF-67(9 h)(Ar) under visible light irradiation. Moreover, the ZIF-67(9 h)(Ar) demonstrates a strong pH changing tolerance in both acid and alkaline aqueous solutions, the degradations can be well performed in a wide pH range from 3.0 to 11.0.
研究领域:
材料科学
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光催化
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环境化学
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纳米材料
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化学工程
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ACS Applied Materials & Interfaces
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2025
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IF 8.2
Yanfang Li,Lifang Wang,Tanlai Yu,Guangming Wen,Xiuzhi Tang,Weichun Chang,Qifeng Li,Junwei Wang
A series of porous Co-doped porous carbon absorbers (SC/CoC) with favorable microwave absorption performance were synthesized originating from a coal hydrogasification semicoke (SC)/Zeolitic Imidazolate Framework (ZIF-67) precursor by a facile static reaction and subsequent pyrolysis approach. SC acts as an external carbon source to avoid structural instability and poor impedance matching characteristics inherent in ZIF-67. The influence of annealing temperature on the microstructure, graphitization degree, electromagnetic parameters, and the microwave absorption (MA) capabilities of SC/CoC composites was systematically investigated. The results demonstrated that the annealing temperature critically influenced the MA performance. When the absorber filling ratio is 30 wt %, the SC/CoC-800 composite exhibits the best MA performance with the minimum reflection loss (RLmin) of −40.89 dB at a thickness of 2.0 mm an effective absorption bandwidth of 4.58 GHz at 1.6 mm in thickness compared with its counterparts. The synergistic effects of conductive loss (porous carbon framework), magnetic loss (Co nanoparticles), polarization loss (dipoles and multiple heterointerfaces), and multiple scattering (pores) endowed the composites with favorable MA performances. This work not only proposes a scalable methodology for fabricating high-performance microwave absorbers but also establishes a sustainable approach to utilize industrial byproduct SC as value-added electromagnetic functional materials.
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IONICS
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2023
·Vol. 29
·期 5
·1741-1749
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IF 2.8
Xiong Qiming,Li Xiongzhuang,Zhou Mulan,Chen Rentian,Sun Cheng,Zhou Yanyan,Wang Sijia,Qiu Xiangyun,Song Meijia,Wei Tao
Nickel cobalt layered double hydroxide (NiCo-LDH) nanosheets have attracted much interests in lithium-ion batteries (LIBs) because of its high capacity and low cost. However, the low cycling stability limits their practical applications. Herein, we introduce a simple one-pot hydrothermal method to fabricate a novel flower-shaped Zif-67@NiCo-LDH heterostructure as the anode materials. The structures, morphology, and compositions of the materials were studied by XRD, SEM, TEM, XPS, EDX, and Raman spectra. Electrochemical tests were also conducted. The Zif-67@NiCo-LDH simultaneously inherited the cycling stability of Zif-67 and the high capacity of NiCo-LDH, which effectively improves the conductivity and structural integrity under the synergistic effect of the flower-shaped heterostructures and compositions and showed a good electrochemical performance. This work might enable the future design of heterostructures materials with layered double hydroxide for many other energy-storage technologies.
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ANALYTICA CHIMICA ACTA
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2022
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IF 6.911
Shan Xu,Peifang Chen,Xichi Lin,Imran Mahmood Khan,Xiaoyuan Ma,Zhouping Wang
Histamine is a significant biomarker to assess the freshness of fish products. In this study, a novel MOF-based SERS sensor for histamine determination was synthesized by wrapping PVP-capped Au nanoflowers with a ZIF-67 shell (Au [email protected] ). The highly branched Au NFs core exhibited a strong electromagnetic field enhancement effect and provided an ultra-sensitive SERS fingerprint spectrum, while ZIF-67 shell was the contributor to enrich the target and stabilize the substrate. The morphology of the core-shell structures can be easily controlled by the concentrations of the capping agent PVP and MOF precursor Co ion . Consequently, 4-MBA pre-grafted on the optimized SERS substrate can act as the Raman internal standard (IS) to eliminate signal fluctuations through standardizing all spectra against its peak at 1074 cm −1 . Moreover, as the specific receptor for histamine molecules, 4-MBA helped reach the low detection sensitivity, where the SERS intensity ratio, I 1172 /I 1074 presented a good linear relationship towards the histamine concentrations (10 −3 -10 −7 M) with the LOD of 0.87 × 10 −7 M (R 2 = 0.9930). Furthermore, the application in monitoring fish spoilage process demonstrated the feasibility and reliability of the developed sensor. This work provided a facile strategy to construct MOF-based SERS substrate as a potential platform for the shelf-life prediction of fish products.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 47
·期 2
·798-811
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IF 3.925
Zhenlu Liu,Jing Xu,Zhenjin Mao,Haochen Wang,Zezhong Li
Photocatalysis is an essential branch in chemical catalysis research, in which the coupling of semiconductors to promote hydrogen production is one of the hot spots of photocatalysis. In recent decades, people's research on semiconductor materials has become perfect. Many studies have shown that coupling semiconductor-like materials such as MOFs with traditional semiconductor materials can often significantly improve photocatalysis. ZIF-67 and ZIF-67-L (Leaf) were embedded in Ni5Al4O11·18H2O using an in situ growth method. Nanoflower-hexagonal sheet and nanoflower-leaf hydrogen production systems were constructed, respectively. The results show that both systems have good hydrogen production capacity. ZIF-67 has a better specific surface area and microporous structure, so the hydrogen production performance of the hexagonal sheet structure under nanoflowers is the best, reaching 1629.3 μmol g−1 h−1.
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Journal of Energy Storage
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2023
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IF 9.4
Jiongfan Wang,Xin Chen,Lingling Chen,Xinyu Li,Jianrong Xiao
The shuttle effect of polysulfide and slow reaction kinetics has hindered the commercialization of lithium–sulfur batteries. Here, metal organic framework (MOF)-derived nitrogen-doped carbon was used as templates, and the continuous interspersed filamentary network structure of multi-walled carbon nanotubes (MWCNT) was used as a modifier to synthesize Co-NC@MWCNT. The exposure of Co-MOF with a high density of catalytic sites in the pores effectively improves the sulfur stability capacity of the composite and inhibits the shuttle effect. The outermost layer of coated MWCNTs and the intermediate layer of N-doped porous carbon effectively protected the Co 2+ active site of the dodecahedral configuration from easy deactivation and agglomeration. The prepared Co-NC@MWCNT composite had an initial discharge capacity of 1240 mA h g −1 (0.1C), it maintained a low decay rate of 0.054 % after 1000 cycles (0.5C). The graphite-like layer gap and multilayer tube structure of the networked MWCNT can effectively mitigate volume expansion during charging and discharging and provide Li + transport channels to improve electrical conductivity . Moreover, the energy storage devices developed as part of this work have excellent electrochemical properties and have a noteworthy industrial potential.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Yan Shang,Jing Xu,Yue Ma,Zezhong Li,Qian Li
Photocatalytic hydrogen production was a potential strategy to solve energy shortage and environmental pollution. One of the valuable research directions for improving photocatalytic efficiency was to prepare catalysts in an efficient and low-cost way. Lamellar Sm 2 WO 6 and dodecahedron Zeolitic Imidazolate Framework-67 (ZIF-67) have been prepared successfully based on morphology control. Sm 2 WO 6 /ZIF-67 was prepared by a novel in situ growth scheme, which was confirmed by crystal structure, morphology and elemental composition analysis . The close interaction between Sm 2 WO 6 and ZIF-67 was confirmed by photoelectrochemical measurements. Based on the design of band structure , the S-type heterojunction was constructed. The research results of this paper provided a reference for exploring non-noble metal composite materials and demonstrated great potential in photocatalytic.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Dong Wang,Yumeng Wang,Xuefen Wang
In this work, a thorn ball-like three-dimensional (3D) heterostructured ZIF-67@α-MnO 2 catalyst consisting of ZIF-67 nanocages impaled by α-MnO 2 nanorods were robustly embedded in polyacrylonitrile nanofibers by electrospinning technique for highly efficient removal of low-molecular-weight pollutants (LMWPs, like dyes and antibiotics) from wastewater. Benefiting from abundant active sites and enhanced charge transfer abilities provided by ZIF-67@α-MnO 2 nanoparticles, the optimal ZIF-67@α-MnO 2 nanofibrous membranes (NFMs) showed a significant response towards acid fuchsin (AF) in terms of comparable adsorption capacity (2495 mg/g) and impressive catalytic activity (degradation degree of 99 % AF within 20 min). In addition, the resultant membranes possessed satisfactory versatile catalytic activity toward tetracycline (95.3 %), norfloxacin (98.4 %) and doxycycline hyclate (89.2 %). Besides, the resultant membranes had high permeability of 1302 L·m − 2 ·h − 1 driven by gravity and could efficiently treat 370.5 L·m − 2 AF (20 ppm), which was significantly higher than that of pure ZIF-67 NFMs (141.8 L·m − 2 ). The successful fabricating of such membrane with extraordinary adsorption and catalytic performance provided a promising approach for high-performance catalytic membranes.
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Polymers
·
2022
·Vol. 14
·期 11
·2204
·
IF 4.967
Yi Qian,Wenyuan Su,Long Li,Rongmin Zhao,Haoyan Fu,Jiayin Li,Peidong Zhang,Qingjie Guo,Jingjing Ma
In this work, a novel three-dimensional (3D) hollow nickel-cobalt layered double hydroxide (NiCo-LDH) was synthesized using zeolitic imidazole framework-67 (ZIF-67) as a template, and then utilized to functionalize molybdenum disulfide (NiCo-LDH/MoS2) via electrostatic force. Flame retardant thermoplastic polyurethane (TPU) composites were prepared by the melt blending method. Compared to pure TPU, NiCo-LDH/MoS2filled TPU composite was endowed with a decrease of 30.9% and 55.7% of the peak heat release rate (PHRR) and the peak smoke production rate (PSPR), respectively. Furthermore, the addition of NiCo-LDH/MoS2can significantly improve the thermal stability and char yield of the TPU composite. The catalytic carbonization effect and dilution effect of NiCo-LDH, and the barrier effect of MoS2nanosheets enable TPU composites with excellent flame retardancy and toxic gas suppression ability.Keywords:layered double hydroxide;molybdenum disulfide;thermoplastic polyurethane;flame retardancy
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Xuan Wu,Dedong Sun,Hongchao Ma,Chun Ma,Xinxin Zhang,Jun Hao
In this research, a novel magnetically recoverable composite catalyst, CuFe 2 O 4 @ZIF-67, was synthesized. CuFe 2 O 4 @ZIF-67 composite catalyst was applied to degrade methylene blue (MB) in water by activating peroxymonosulfate (PMS). The results showed that the degradation rate of MB (20 mg/L) reached 98.9% in 30 min in the 0.2-CuFe 2 O 4 @ZIF-67 (75 mg/L) + PMS (125 mg/L) system. Both electron paramagnetic resonance (EPR) studies and radical quenching experiments revealed that SO 4 − •, •OH, 1 O 2 and •O 2 − were involved in the degradation of MB. We proposed a catalytic mechanism of PMS activation by CuFe 2 O 4 @ZIF-67. With the synergistic effect of Co 3+ /Co 2+ , Fe 3+ /Fe 2+ and Cu 2+ /Cu + redox cycles, it can keep its outstanding catalytic activity. Recycling tests showed that the removal rate of MB can still be maintained above 85%, indicating that CuFe 2 O 4 @ZIF-67 has good reusability. In general, owing to its reusability and excellent catalytic activity, the CuFe 2 O 4 @ZIF-67 composite catalyst has a good application prospect in water pollution control.
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JOURNAL OF SOLID STATE CHEMISTRY
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2022
·
IF 3.656
Ying Yan,Zijian Wang,Ting Ding,Huiping Zhang
Co 3 O 4 catalysts supported on paper-like stainless steel fibers (PSSF) were prepared by MOFs-templated (M) method and applied for catalytic combustion of isopropanol. Physicochemical properties of the as-synthesized Co 3 O 4 catalysts were investigated by SEM, EDS mapping, TEM, XRD , BET, XPS and H 2 -TPR, respectively. Characterization results of SEM and TEM shown that Co 3 O 4 (M)-350 and Co 3 O 4 (M)-400 still remained the dodecahedron shape of the ZIF-67 precursor and possessed porous structures. The XPS results shown that the ratio of Co 3+ /Co 2+ and O c /O c + O a + O l firstly increased and then decreased with the increase of calcination temperature. Among the as-synthesized catalysts, Co 3 O 4 (M)-400 exhibited the highest activity for the catalytic combustion of isopropanol with the T 50 and T 90 values of 258 °C and 281 °C, respectively, which was associated with high BET surface area, high amount of Co 3+ species and abundant surface chemisorbed oxygen. Moreover, Co 3 O 4 (M)-400 was employed as a structured catalyst for isopropanol combustion, the catalytic kinetics were studied based on different feed concentration, bed height and GHSV. The experimental results indicated that the T 50 and T 90 of isopropanol combustion over Co 3 O 4 (M)-400 with the bed height of 2 cm were increased slightly as the GHSV and feed concentration of isopropanol increased.
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Petroleum Science
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2022
·
IF 4.757
Yu-Ming Li,Zi-Ye Liu,Qi-Yang Zhang,Ya-Jun Wang,Guo-Qing Cui,Zhen Zhao,Chun-Ming Xu,Gui-Yuan Jiang
Propylene is a significant basic material for petrochemicals such as polypropylene, propylene oxide, etc. With abundant propane supply from shale gas, propane dehydrogenation (PDH) becomes extensively attractive as an on-purpose propylene production route in recent years. Nitrogen-doped carbon (NC) nanopolyhedra supported cobalt catalysts were synthesized in one-step of ZIF-67 pyrolysis and investigated further in PDH. XPS, TEM and N 2 adsorption-desorption were used to study the influence of carbonization temperature on as-prepared NC supported cobalt catalysts. The temperature is found to affect the cobalt phase and nitrogen species of the catalysts. And the positive correlation was established between Co 0 proportion and space time yield of propylene, indicating that the modulation of carbonization temperature could be important for catalytic performance.
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