JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
·
IF 6.76
Xiaomi Meng,Lin Yang,Wenju Jiang,Lu Yao
In this study, a N-functionalized porous carbon derived from ZIF-8 (NFPC) was prepared and applied for the gaseous acetone and toluene adsorption removal. The NFPC perfectly inherited the morphology of parent ZIF-8, posed a high specific surface area (S BET = 1228 m 2 ·g −1 ), be rich in surface nitrogen functional groups, and resulting in a good dynamic adsorption of the VOCs. The NFPC-1000 exhibited the best adsorption performance of low concentration acetone and toluene, with equilibrium adsorption capacity of 203.4 and 297.1 mg·g −1 at 25 °C respectively. The acetone and toluene adsorption were spontaneously and exothermic, given the negative values of free energy (ΔG) and enthalpy (ΔH). The difference of acetone and toluene adsorption on NFPC attributed to the affinity difference (boiling point, polarity and molecular diameter), the nitrogen-containing functional groups (pyridinic-N) and the cation-π bonding. Therefore, the NFPC was found to be more favorable for aromatic compounds adsorption, the toluene adsorption of NFPC-1000 only decreased 5.3% after 6 cycles reuse, while its adsorption capacity of acetone lost more than 60%.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2020
·Vol. 46
·期 6
·2951-2967
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IF 2.262
Zheng Wei,Feng Sheng,Shao Cong,Zhu Guiliang,Ni Ziqiu,Sun Jiajia,Huang Xianglin
A novel binary photocatalytic composite (BiOI/ZIF-8) was successfully constructed by solvothermal method. Its crystal morphology, chemical state of the elements and electrochemical properties were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy and photoluminescence analysis. Appropriate ZIF-8 doping enhanced the separation and utilization of photogenerated electrons, promoted the capture of contaminants and rapidly produces active species, thereby accelerating the photocatalytic degradation of contaminants. Degradation experiments on BPA showed that the photocatalytic property of BiOI/ZIF-8 (0.5) was significantly improved compared with the parent material. BiOI/ZIF-8 (0.5) showed the highest reaction rate constant (0.06061 min −1 ), 9.2 times that of BiOI (0.00659 min −1 ) and 23.3 times that of ZIF-8 (0.0026 min −1 ). In addition, five cycle tests showed that BiOI/ZIF-8 was highly efficient in recycling and stability. Through capture experiments, superoxide free radicals ·OH, h − and ·O 2 − play an important role in degrading BPA, among which superoxide free radicals h + play a major role.
研究领域:
材料科学
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环境科学
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光催化技术
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Wenji Zheng,Rui Ding,Kai Yang,Yan Dai,Xiaoming Yan,Gaohong He
Poly (ether- block -amide) (Pebax) based mixed matrix membranes (MMMs) were prepared by using size-tunable ZIF-8 nanoparticles as fillers. ZIF-8 nanoparticles with sizes of 40, 60, 90 and 110 nm (ZIF-8-40, ZIF-8-60, ZIF-8-90 and ZIF-8-110) were synthesized in microemulsion by controlling the ratio of Zn 2+ to Hmim (1:16, 1:8, 1:5, 1:2). And they were distributed uniformly in Pebax matrix without obvious agglomerations and defects at the loading of 0–20 wt.%, which was confirmed by field-emission scanning electron microscopy (FE-SEM). The incorporation of ZIF-8 resulted in a significant improvement in CO 2 permeability and the CO 2 /N 2 selectivity increased with the BET surface area of ZIF-8 increasing. The enhanced permeability is attributed to an improvement in the free volume of the polymer induced by larger sized ZIF-8, while the increased selectivity results from the high specific surface area of large sized ZIF-8, which can provide more active sites for CO 2 capture and great mass transfer resistance for N 2 . At 5 wt.% loading of ZIF-8-90, the MMM presents the best separation performance with CO 2 permeability of 99.7 Barrer and CO 2 /N 2 selectivity of 59.6, both of which are increased by about 25% by comparison to the pure Pebax membrane. The present study provides an effective way to obtain size-controlled ZIF-8 fillers and high separation performances of Pebax based MMMs.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2018
·
IF 5.116
Baokai Ma,Ling-Zhi Cheong,Xinchu Weng,Chin-Ping Tan,Cai Shen
Organophosphorus pesticides especially p -nitrophenyl pesticides (methyl parathion) have neurotoxic effects and it is a difficult to remove organophosphorus pesticides residues from contaminated water. Present work has developed a sensitive, direct and rapid lipase@ZIF-8/chitosan/glassy carbon electrode (GCE) and lipase@amine-modified ZIF-8(An-ZIF-8)/chitosan/GCE biosensors for detection of methyl parathion . ZIF-8 and An-ZIF-8 nanoparticles which are a type of metal-organic frameworks with large surface area and high porosity have been facilely prepared under mild biocompatible conditions and used as lipase immobilization matrixes in the biosensors. The optimized lipase@ZIF-8/chitosan/GCE and lipase@An-ZIF-8/chitosan/GCE biosensors can detect methyl parathion with a wide linear range, good repeatability, recovery and limit of detection as low as 0.28 μM. The as-prepared biosensors can be stored in 0.05 M PBS (pH 7) at 4 °C and reused for at least 20 days with a retainment of at least 80% of its initial response to methyl parathion. This indicated that both ZIF-8/chitosan and An-ZIF-8/chitosan are suitable for immobilization of lipase that favors generation of p -nitrophenol from methyl parathion; and subsequent electrochemical oxidation and electron transfer of the p -nitrophenol.
研究领域:
分析化学
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环境科学
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毒理学
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产品关联
DOI
高影响因子
CHEMIE INGENIEUR TECHNIK
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2021
·
IF 1.672
Luxi Lyu,Houxiao Wu,Libo Li,Yanying Wei,Haihui Wang
Metal-organic frameworks (MOFs) show great potential for adsorption separation. However, MOFs' flexibility may influence their adsorption behaviors. Here, for the first time we prepare ZIF-8 powder dominated with stiffened ZIF-8_Cm phase under an external E-field. By comparison, we find that the flexibility of ZIF-8 has little influence in equilibrium-based separation behavior for C 3 H 6 /C 3 H 8 . However, the stiffened ZIF-8 formed in E-field presents an obviously decreased diffusion rate for C 3 H 8 , whose C 3 H 6 /C 3 H 8 kinetic-based separation factor is around 2.5 times higher than that of the traditional ZIF-8 powder.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 38
·期 6
·1349-1355
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IF 2.726
Xiao Meng,Qi Wenqian,Jia Shuanghui,Pang Mengting,Shi Fengcheng,Mao Hui
Significant concerns have been raised over the removal of antibiotics, such as tetracyclines(TC) in aquatic environments. Herein, we synthesized a new type of heterogeneous catalyst by supporting Fe 0 nanopartciles(FeNPs) onto carbon coated ZIF-8 (C@ZIF-8). The carbon layer formed by glucose was beneficial to maintain the morphology and porous structure of ZIF-8, which can also appropriately improve the hydrophobicity of ZIF-8 for enriching the TC. The as-prepared FeNPs-C@ZIF-8 catalyst featured an extreme large specific surface area(1122.16 m 2 /g), and the supported FeNPs with an average diameter of 6.13 nm exhibited a high dispersity on the supporting matrix of C@ZIF-8. For the removal of tetracycline, the large specific surface area of FeNPs-C@ZIF-8 allowed for an easy access of tetracycline to the FeNPs, while the highly dispersed FeNPs served as actived sites for the efficient degradation of tetracycline. A synergistic effect between adsorption and catalytic degradation of FeNPs(5%, mass fraction)-C@ZIF-8 was proven to be responsible for the high-performance removal of tetracycline with the removal efficiency high up to 93.02% at pH 5, 25 °C. The FeNPs-C@ZIF-8 was capable of recycling after activation with supplementary Fe 0 , which still maintained a high removal efficiency of 75.52% in the 5th cycle within 20 min.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CARBON
·
2023
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IF 10.9
Xue Wang,Liying Zhang,Enjie Ding,Xinhui Cao,Chuyang Luo,Liqian Huang
The design and preparation of excellent microwave absorbing materials is of great importance facing increasingly negative effects of electromagnetic (EM) wave radiation and interference. Combining metal-organic frameworks (MOFs) with one-dimensional (1D) carbon nanofibers is a valuable approach to improve microwave absorption performance . Herein, C/zinc oxide (ZnO) nanofiber composites were synthesized using the seed-assisted in situ electrospinning method , with the precursor being a zinc-based zeolitic imidazolate framework (ZIF-8). The unique porous structure and the heterointerfaces formed between C and ZnO facilitated the scattering and multiple reflections of microwaves. On account of the combination of interfacial polarization loss, dipole polarization loss and conduction loss , the C/ZnO nanofiber composites exhibited outstanding microwave absorption performance. The minimum reflection loss ( RL min ) of −58 dB at 7.5 GHz as well as an effective absorption bandwidth ( EAB ) of 6.5 GHz was achieved. This work provides an innovative methodology for developing highly efficient microwave absorbing materials using a combination of carbon materials and MOF nanoparticles .
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
PETROLEUM CHEMISTRY
·
2024
·Vol. 64
·期 2
·297-308
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IF 1.3
Han Yating,Xia Xia,Peng Zexuan,Xiao Yang
Abstract To address the limitations of the existing catalytic hydrogenation and sulfuric acid sulfonation intended to remove aromatic hydrocarbons from liquid paraffin oils, the adsorption method was chosen for the adsorptive separation of phenanthrene, a typical aromatic hydrocarbon, from liquid paraffin oils. A zeolite imidazolate framework-8 (ZIF-8) precursor was firstly prepared, and then ZIF-8-derived porous carbon (ZDPC) adsorbents were obtained using different temperatures of carbonization of the precursor under nitrogen atmosphere; these adsorbents were then used for the adsorption and separation of phenanthrene from liquid paraffin oils. The experiment showed that the maximum specific surface area of a ZDPC adsorbent could reach 1458 m 2 /g at 900°C. However, the total pore volume and adsorption capacity of ZDPC porous carbon were maximal at the carbonization temperature of 800°C (1.59 cm 3 /g and 931 mg/g, respectively). The obtained results showed that an increase in the specific surface area of the adsorbent did not necessarily enhance the adsorption performance. However, compared with the specific surface area of the adsorbent, its adsorption performance is improved in the case of larger pore structures. Therefore, the pore structure of the adsorbent has a very important influence on the adsorption performance. The results of kinetic and thermodynamic studies showed that the pseudo-second-order model could better explain the adsorption process of ZDPC on phenanthrene, while the intra-particle diffusion model revealed that the adsorption mechanism represented a continuous three-stage process.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jie Song,Lijun Chen,Yingnan Zhou,Zhiwen Yuan,Yuhua Niu,Zhiqiang Wei
With the rapid development of industrialization, the removal of heavy metal ions and small organic molecules from wastewater has triggered a hot debate. ZIF-8 was grown on a sodium alginate backbone using an in situ growth technique, the core-shell P-SMG@ZIF-8 was synthesized. It was also characterized by FTIR, XRD, SEM, UV–Vis and XPS, and the optimal conditions and mechanism of adsorption were explored. At pH 2.0, a contact time of 200 min, and 298 K, removal of Cu(II) and Ph up to 80.2 %, 65.6 % by P-SMG@ZIF-8, adsorption behavior consistent with Langmuir model for pseudo-secondary rates, the saturated adsorption of Cu(II) and Ph could reach up to 83.5812 mg/g and 78.1779 mg/g, respectively. And the adsorbed P-SMG@ZIF-8 is easy to separate and reusable, which is a cost-effective and efficient natural product-based adsorption material.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Li Yin,Zhenguo Liu,Yufu Yang,Yang Guo,Guanying Zhang,Fangyuan Gai,Yuhui Ao,jieran Liu,Bingjing Xin,Yunling Liu
Organic dyes pollution of contaminated water is posing serious environmental crisis. In this work, the robust absorbent of organic dyes has been proposed by using carboxyl-modified carbon fiber (CF) cloths as scaffolds to structure ZIF-8 powder with specific shape (area: 10 × 10 cm 2 and thickness: 2 mm). The grinding ZnO and 2-methylimidazole powder was deposited on –COOH groups functionalized CF-cloth via an in situ non-solvent synthesis process without using binder. This as-synthesized robust absorbent was assembled layer-by-layer with four folds of ZIF-8 layers by inserting three folds of CF (3k, T300) between ZIF-8 layers. The surface microstructure of ZIF-8 and robust absorbent has been investigated and compared by X-ray diffraction. The techniques including Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS), and X-ray photoelectron spectroscopy (XPS) have been proposed to confirm the interfacial adhesion and surface modification of CF cloths layers in robust adsorbent. Moreover, compared to ZIF-8, CF-ZIF-8 composite exhibited improved thermal stability by the thermal gravimetric (TG) analysis. The CF-ZIF-8 composite exhibited two types of adsorption curves by using UV absorption spectra , which could discriminate six kinds of organic dyes by charge effect. The UV absorption of MB(Methylene Blue), CV(Crystal Violet) and TB(Toluidine Blue) dropped dramatically and exhibited only 4.5%, while the UV absorption of RB19 (Reactive Blue 19), RhB (Rhodamine B) and MO (Methyl Orange) exhibited 58.2%, 58.3% and 70.0% of original absorption intensity after conducted adsorption processes of 700 min, respectively. The as-synthesized robust adsorbent would be easily adapted and recycled from wasted water of real industry fields, which may attract more attentions to build the bridge between MOFs powder materials to carbon fiber cloth for real use.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhiqiang Guo,Hongli Wang,Liang Wang,Bin Zhao,Yiran Qian,Hongwei Zhang
Pharmaceuticals and personal care products (PPCPs) are universally detected in natural waters, posing potential risks to drinking water safety. Nanofiltration (NF) is an advanced technology for water purification; however, its removals of PPCPs are unsatisfying, especially for hydrophobic species. In this study, the 3D architecture of nanomaterials were used to manipulate the performance the polyamide (PA) thin-film nanocomposite (TFN) membrane. In-situ addition of polyethyleneimine (PEI) successfully induced the assembly of ZIF-8 nanocrystals into star-shaped clusters (ZIF-8-PEI) due to the coordination between PEI and Zn 2+ . Together with the improved hydrophilicity, these ZIF-8-PEI clusters became excellent scaffolds for water drop retention after discretely loading onto the porous substrate. The conical protrusions of the ZIF-8-PEI clusters supported the defect-free PA film produced by the interfacial polymerization (IP), leaving big interfacial cavities underneath. These cavities worked as gutters for water transport, and the water permeance of the optimal TFN was 79% higher than that of the pristine thin-film composite (TFC) membrane. Moreover, the water impregnated cavities markedly alleviated the hydrophobic interaction between the PA film and hydrophobic PPCPs, impeding the transport of PPCPs across the membrane. Our results demonstrated the importance of the 3D architecture of nanofillers for the improving membrane performance.
研究领域:
水处理
·
膜科学
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环境工程
·
材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhenda Liang,Haiqing Wang,Kena Zhang,Ge Ma,Lishan Zhu,Li Zhou,Bing Yan
Low-cost MnO 2 has been vigorously investigated in the field of catalysis. However, high amount of MnO 2 usually needs to be used in the disinfection process owing to their low photocatalytic activity. In this work, modification of MnO 2 with zeolitic imidazole framework-8 (ZIF-8) for improving the photocatalytic bactericidal performance was explored for the first time. Specifically, MnO 2 /ZIF-8 exhibited complete inactivation of multi-drug resistant Escherichia coli ( E. coli) at a low concentration (3.24 μg/mL) with simulated solar irradiation. The 1 O 2 rather than O 2 − or OH was identified as the major reactive species for the bacterial inactivation. Mechanistic studies indicated that the superior bactericidal property of MnO 2 /ZIF-8 than the pristine material could be ascribed to the increased surface oxygen vacancies (OVs) amount and an inhibited electron and hole recombination. This study provides a novel type of photocatalyst for antibacterial application and may shed light on designing MnO 2 based low-cost nanocomposites with photocatalytic bactericidal capability for the practical water disinfection treatment.
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）