MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Wei Xu,Jichao Wang,Pan Zhang,Nikom Klomkliang,Somboon Chaemchuen,Francis Verpoort
A facile growth of microporous ZIFs , such a s ZIF-67, ZIF-8 into mesoporous alumina to obtain hierarchical micro/mesoporous ZIFs@Al 2 O 3 is achieved. Several analysis techniques, such as powder-XRD, SEM, ICP, and gas adsorption , etc. are applied to characterize the composite materials. The use of a surfactant is the critical parameter to functionalize and assist the nano-crystal ZIFs growth in meso -Al 2 O 3 . To obtain a high crystal density ZIF-growth in meso-Al 2 O 3 different parameters are tuned such as the surfactant (type and concentration), precursor concentration of ZIFs, and synthesis cycle of the composite material. The synthesis strategy is applicable for any ZIFs to be hybridized on supporting media such as m eso -Al 2 O 3 . Furthermore, the application of ZIF-67@Al 2 O 3 as a catalyst is examined and shows a high performance and recyclability for applications such as the Knoevenagel condensation and CO 2 fixation reaction with epoxides. The highly active sites are distributed on a larger particle support (m eso -Al 2 O 3 ) is found to enhance the catalytic performance. Finally, the main advantage of the composite material is the straightforward handling compared to the use of bulk phases MOFs as a catalyst.
研究领域:
材料科学
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催化化学
·
纳米技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Jiaming Shen,Yang Li,Chaohai Wang,Rui Luo,Jiansheng Li,Xiuyun Sun,Jinyou Shen,Weiqing Han,Lianjun Wang
Desalination performance of capacitive deionization (CDI), a promising deionization technology, depends significantly upon the compositions and internal structures of electrode materials . Herein, hollow ZIFs-derived nanoporous carbons (HZCs) were prepared via chemical etching method and subsequent pyrolysis . Particularly, the tannic acid as an etching agent was employed to tailor hollow structure. The resultant HZCs possess high surface area, wide pore size distribution , obvious hollow cavity and high nitrogen content. Moreover, HZCs electrodes exhibited a significantly improved CDI performance over the solid ZIFs-derived nanoporous carbons (SZCs) electrodes. The improved electrosorption rate and capacity (15.31 mg g -1 at 1.2 V) of HZCs electrode imply that hollow structure facilitates the transportation for both ions and mass on CDI process. Besides, the further cycle experiment exhibits a great regeneration stability of HZCs electrode over 20 adsorption-desorption cycles. All these results indicate that HZCs should be a promising candidate for CDI application.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2019
·
IF 6.035
Hao Zhang,Wuxiang Zhang,Jiaming Shen,Yang Li,Xin Yan,Junwen Qi,Xiuyun Sun,Jinyou Shen,Weiqing Han,Lianjun Wang,Jiansheng Li
Desalination performance of hybrid capacitive deionization (HCDI) intensively depends on the electrode materials with redox activity and capacitance ability. Herein, Ag-doped hollow ZIFs-derived nanoporous carbon (Ag/ZCs) was employed as an anode material by the pyrolysis of Ag-doped hollow ZIFs precursor, which was fabricated by in situ tannic acid (TA) etching/reduction strategy. Provably, TA serves as not only an etchant for tailoring ZIFs structure, but also a reductant for Ag nanoparticles formation. The obtained Ag/ZCs possesses unique hollow cavities and high redox activity. As expected, the HCDI system with Ag/ZCs electrode exhibits excellent deionization capacity of 29.18 mg g −1 in 500 mg L −1 NaCl solution at 1.2 V, which is much higher than that of conventional carbon-based CDI system. Moreover, desirable regeneration stability of the Ag/ZCs HCDI was well maintained after 20 cycle experiments. The results demonstrate that Ag/ZCs is a potential anode material for HCDI applications.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 18
·8912-8918
·
IF 3.925
Qianqian Hu,Guoning Chen,Lu Wang,Xia Cui,Chun Chang,Qiang Fu
Sarcosine is an important biomarker in the diagnosis of prostate cancer. It is essential to explore a method that detects sarcosine in biological samples quickly and accurately for the early screening and diagnosis of prostate cancer. Considering the high catalytic efficiency and good selectivity of enzymes, there is potential for establishing enzymatic methods for the determination of sarcosine. However, the poor stability, high economic consumption, and challenging recyclability of free enzymes limit their use. Here, sarcosine oxidase was immobilized to improve its stability. The properties of the immobilized enzyme, including the morphology and stability, were characterized. Then, the enzymatic reaction between the immobilized enzyme and the substrate sarcosine was employed to establish a fluorescence method with a linear range from 0.1563 to 10.00 μg mL−1, a LOD of 0.04 μg mL−1, and a recovery of 84.7–104.0%. It has been proved that sarcosine can be detected using the established method with short time consumption, high specificity, and low cost, and which is easy to operate and is affordable for many laboratories and community-level medical institutions. These results demonstrate that this method shows potential for practical applications in the diagnosis of prostate cancer.
研究领域:
生物化学
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医学诊断
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材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2024
·
IF 5.4
Ruth Antwi-Baah,Mirabel Ewura Esi Acquah,Malcom Frimpong Dapaah,Xiaoqin Chen,Joojo Walker,Heyang Liu
Instigating oxidative stress is a crucial aspect of antibacterial therapy. Yet, its behavior is poorly understood in the context of zeolitic imidazolate frameworks (ZIFs) – a group of highly promising antibacterial agents. To address this gap, a series of ZIF@Ce6 particles were synthesized to investigate the impact of particle shape, size, and metal ion type on oxidative stress and bactericidal activity. For the first time, the interplay between the physicochemical properties and antibacterial activities of different ZIF@Ce6 particles is demonstrated, while unearthing their oxidative stress strategy in photodynamic therapy. Notably, the incorporation of chlorin e6 (Ce6), combined with light irradiation, amplified the bactericidal effect of the ZIFs and achieved a rare minimum inhibition concentration (MIC) of 12.5 µgmL -1 for ZIF-8. We discovered that singlet oxygen ( 1 O 2 ) production varies with particle shape and size, while photodynamic activity reshuffles the antibacterial performance sequence from pristine to modified ZIF-8. Interestingly, reactive oxygen species (ROS) accumulation and glutathione depletion tests revealed that oxidative stress in pristine ZIF-8 is predominantly induced by ROS, whereas both ROS and glutathione contribute to the oxidative stress in ZIF@Ce6 and pristine ZIF-67. When bacteria are preincubated with the antioxidant N-acetyl cysteine, the bactericidal activity of ZIF@Ce6 increases while the activity of pristine ZIF-8 is reduced and that of ZIF-67 remains unchanged. This study deepens our understanding of the antibacterial properties of ZIFs and their oxidative stress paths, paving way for the fabrication of ZIF-based materials with enriched and targeted antibacterial properties.
研究领域:
微生物学
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材料科学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xiaoqian Li,Dechao Wang,Hailong Ning,Yangyang Xin,Zhongjie He,Fangfang Su,Yudeng Wang,Jing Zhang,Hongni Wang,Liwei Qian,Yaping Zheng,Dongdong Yao,Mingtao Li
Porous liquids (PLs), as a novel liquid sorbent with permanent porosity, still present challenges such as high viscosity and melting temperatures. Herein, an efficient electrostatic repulsion strategy is proposed to engineer zeolitic imidazolate frameworks (ZIFs) type III PLs employing ZIF-8- g -BPEI nanoparticle stability dispersed into BPEI. The viscosity and melting temperatures of ZIF-8- g -BPEI PLs could be tailored via control particle size, grafting polymer, and concentration of porous nanoparticles . The existence of BPEI on the surface of ZIF-8- g -BPEI facilitates the stable dispersion of ZIFs nanoparticles in BPEI via the electrostatic repulsion as well as enhances CO 2 adsorption capacity of PLs. Moreover, the CO 2 adsorption amount of ZIF-8- g -BPEI-30 PLs is 6.5 times high than that of neat BPEI, suggesting the permanent free volume of ZIFs is retained in their corresponding PLs. Benefiting from the branched structure of BPEI grafted onto the outer surface of ZIFs , ZIF-8- g -BPEI-10 PLs remain liquified down to -71.1 °C, together with viscosity as 1.7 Pa·s −1 at 25 °C. Therefore, the electrostatic repulsion strategy opens an effective avenue to prepare novel liquid materials and shows numerous potential applications in gas adsorption and separation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2024
·Vol. 102
·期 10
·3532-3549
·
IF 1.6
Wen Jiang,Shifeng Miao,Yujie Yang,Yu Long
This research endeavour aims to investigate the adsorptive separation of the branched chain (BCAA) and aromatic amino acids (AAA). Based on the different molecular sizes of BCAA and AAA, zeolitic imidazolate frameworks (ZIFs) with different pore structures were prepared by regulating the size of imidazole ligands. The structure and pore shape were characterized by Fourier transform infrared spectroscopy (FT-IR), x-ray diffraction (XRD), scanning electron microscope (SEM), and BET surface area (BET). The results indicated the successful synthesis of ZIF-[Co(mIm) 2 ], ZIF-[Co(eIm) 2 ], and ZIF-[Co(pIm) 2 ] with pore size distribution of 7.821, 6.943, and 9.394 Å, and particle size of these ZIFs was approximately 4 μm. ZIF-[Co(eIm) 2 ] was chosen as the optimal ZIFs for the separation of BCAA and AAA. The adsorption experiment was evaluated in the respective single and binary systems. The corresponding data in a single system demonstrated that ZIF-[Co(eIm) 2 ] showed good adsorption performance for BCAA and poor for AAA. Furthermore, the adsorption behaviour under experimental conditions conformed well to the pseudo-second-order kinetic model and Langmuir isotherm. ZIF-[Co(eIm) 2 ] had great separation ability for BCAA/AAA in their binary system. Finally, regeneration studies further manifested that ZIF-[Co(eIm) 2 ] exhibited fine reusability performance with adsorption efficiencies still higher than 70% after five cycles. This study exhibits a novel path for the design of adsorbents for efficient separation of BCAA/AAA.
研究领域:
生物化学
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材料科学
·
分离技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Weihao Zhu,Yuanfeng Wu,Guiyun Yi,Xiaoxiao Su,Qiangsheng Pan,Shengbin Shi,Olayinka Oderinde,Guomin Xiao,Chuanxiang Zhang,Yulong Zhang
The present work is aimed at studying the synergistic catalysis of the bimetal ZIFs containing Co and Zn metal ions prepared by solvothermal method in the degradation of organic pollutants under ambient conditions. The bimetal mixed ZIFs were further characterized by some techniques such as XRD, SEM, TG-DTG, XPS, UV–vis, ESR, and N 2 -adsorption. Interestingly, the sample prepared with equal metal ions (1Zn:1Co) showed the highest catalytic performance for methylene blue (MB) degradation (94.10 %). This may be associated with the interaction between cobalt and zinc within the adjacent lattice, which make the MB molecule to be easily adsorbed and degraded on empty electron orbit. Furthermore, the highest degradation of MB was achieved with 98.83 % under the optimized conditions (catalyst weight of 50 mg, pH of 5, 3 h, 30 °C). Besides, the various substrates such as methyl orange, indole, rofloxacin, methyl blue, and tetracycline were also investigated under the same conditions. Additionally, the DFT calculation results suggested the more orbital distribution (LUMO, HOMO) of ZIF(1Zn:1Co) can result to more electrons being easily captured, and generate more radicals via electron transfer. Finally, the photocatalytic degradation of MB is consistent with the first law of kinetics, and the activation energy is 26.797 KJ/mol in the presence of ZIF(1Zn:1Co).
研究领域:
环境科学
·
材料科学
·
计算化学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Xiangyu Shan,Juan Lu,Qian Wu,Chao Li,Huiling Li,Shuning Yang,Li Tian
In this paper, a novel and simple electrochemiluminescent sensor of CQDs based on ZIFs electrospun carbon fiber was constructed for the detection of malathion. Carbon quantum dots (CQDs) was obtained by pyrolysis of citric acid at high temperature. ZIFs electrospun carbon fiber (ENCF-67) prepared by electrospinning combined with high temperature calcination adsorbed Au NPs to obtain ENCF-67@Au. And the sensor of Nafion/ENCF-67@Au/CQDs/GCE was constructed by sequentially modified CQDs, ENCF-67@Au and Nafion on the electrode surfaces. ENCF-67@Au was used as the fixation material of CQDs and accelerator of system because ENCF-67 had the advantage of large specific surface area and porosity. Nafion/ENCF-67@Au/CQDs/GCE obtained sensitive and stable electrochemical luminescence signal in PBS containing S 2 O 8 2- . The addition of malathion enhanced the ECL signal of the sensor with a linear increase in the range of 1.0 × 10 -12 − 1.0 × 10 -7 M and the limit of detection 3.3 × 10 -13 M (S/N = 3). The sensor had good selectivity for malathion, which provided a simple and sensitive method for the detection of malathion in fruits and vegetables in real life and had potential applications.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Zelin Wu,Yupeng Wang,Zhaokun Xiong,Zhimin Ao,Shengyan Pu,Gang Yao,Bo Lai
A core-shell metal-organic framework encapsulated Fe 3 O 4 magnetic particles (Fe 3 O 4 @Zn/Co-ZIFs) was designed and synthesized successfully to activate peroxymonosulfate (PMS) for carbamazepine (CBZ) degradation. It exhibits superior catalytic performance since the unique interior structure and synergistic effect between ZIFs shell and Fe 3 O 4 core, achieving 100% removal of CBZ (5 mg/L) within 30 min. The outer wrapping structure of ZIF-8 can stabilize the ZIF-67 and Fe 3 O 4 under intricate reaction conditions to restrain the leaching of Co ions (as low as 0.067 mg/L). Further investigation found that both SO 4 – and OH contribute to the degradation of CBZ at initial stage, and SO 4 – gradually plays a pivotal role with the reaction time prolonging. The acceleration of electron transfer between Fe 3 O 4 and cobalt active sites of Zn/Co-ZIFs could induce the redox cycling of Co 2+ and Co 3+ . The possible degradation pathway was proposed by analyzing intermediates. This work extends the development of MOFs materials for environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Zhaoyang Qi,Songyu Li,Yaxin Cai,Rongkai Cui,Jie Chen,Changshen Ye,Ting Qiu
Methyl ethyl carbonate (EMC) is the primary raw material for the electrolyte of lithium-ion batteries. It is mainly prepared by the transesterification reaction of dimethyl carbonate (DMC) and EtOH. However, homogeneous alkaline catalysts such as sodium alcohol commonly used in industry are easy to deactivate and challenging to separate and recover. Therefore, the alkaline ionic liquid decorated zeolitic imidazolate frameworks (IL@ZIFs) heterogeneous catalysts were prepared using a simple method with DBU as an inducer. In the synthetic route of IL@ZIFs, the ligand of ZIFs can form an ionic liquid with DBU, and deprotonated ligands will rapidly coordinate with metal ions at room temperature. The DBU can also play the structural guidance and stabilizer, which is conducive to the rapid and effective preparation of ZIFs materials. Meanwhile, the DBU, which has a large molecular diameter, will be trapped in the pore cage and can combine with other protic materials (imidazole, triazole, 2-methylimidazole, phenol, etc.) to form alkaline ionic liquids. The prepared DBU-IL@ZIFs were used as heterogeneous catalysts for synthesizing EMC by transesterification reaction. The DBU-PO@ZIF-8 composite with phenol as anion has better catalytic activity. Under the appropriate reaction conditions, the yield of EMC can reach 55.7% with high selectivity of 94.7%. The catalytic mechanism of DBU-PO@ZIF-8 in the transesterification reaction was also explored and revealed.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Lifang Ge,Meizhen Gao,Xiaosheng Zhang,Jiang Wang,Qi Shi,Jinxiang Dong
The adsorption and separation of diols from dilute aqueous solution using hydrophobic materials is very challenging due to the strong diol–water hydrogen-bonding interactions. Herein, we screened hydrophobic zeolitic imidazolate frameworks (ZIFs) with chabazite (CHA) topology for separation of 2,3-butanediol (2,3-BDO) and 1,3-propanediol (1,3-PDO), which had junctional and hydrophobic traps matching the two end methyl groups of the 2,3-BDO molecule. Based on CHA-ZIFs with the same small-sized ligand 2-methylimidazole (mIm) and different large-sized ligand benzimidazole derivatives (RbIm), CHA-ZIFs with larger surface areas were obtained by the addition of excess small-sized ligand mIm in the synthesis process. We showed that all of the hydrophobic CHA-ZIFs preferentially adsorbed 2,3-BDO over 1,3-PDO by static batch adsorption and dynamic column adsorption experiments. But ZIF-301 and ZIF-300 with halogen groups exhibited better adsorptive separation performance for 2,3-BDO/1,3-PDO than ZIF-302 with methyl groups. For a typical ZIF-301, its adsorption capacity for 2,3-BDO was 116.4 mg·g –1 and selectivity for 2,3-BDO/1,3-PDO was 3.8 in dynamic column adsorption of the binary-component system (2,3-BDO/1,3-PDO: 50/50 g·L –1 ). Computational simulations revealed that 2,3-BDO preferentially adsorbed in a trap at the junction between the cha and d6r cages of CHA-ZIFs, meaning the strong host–guest interactions. Therefore, the hydrophobic CHA-ZIFs with a junctional trap were promising candidate materials for adsorbing 2,3-BDO, which also provided a new perspective for separating diols in dilute aqueous solutions.
研究领域:
材料科学
·
化学工程
✓ 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）