JOURNAL OF SOLID STATE CHEMISTRY
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2022
·
IF 3.656
Yuping Li,Ping Xiang,Haotian Chen,Yuan Zhou
The discharge of dye wastewater threatens the ecology and biological health. Adsorption technology is the preferred treatment method and absorbent is core. In this study, a high-performance ZIF-8@ZIF-67 adsorbent was synthesized by epitaxial growth . XRD and TEM demonstrated the successful synthesis of the core-shell ZIF-8@ZIF-67 and BET showed that the specific surface area, pore volume and diameter of ZIF-8@ZIF-67 were 1518.75 m 2 /g, 0.65 cm 3 /g and 1.71 nm, respectively, with microporous being the predominant. The optimum adsorption conditions for the adsorption of Direct Blue-86 by ZIF-8@ZIF-67 were an initial concentration of 150 mg/g, a ZIF-8@ZIF-67 dosage of 5 mg, and a pH of 8, and the adsorption capacity at this condition was 301.69 mg/g. The mechanism of adsorption on Direct Blue-86 has been speculated to be electrostatic interaction , hydrogen bonding , Lewis acid-base interaction, π-π stacking and coordination. The kinetics of adsorption of Reactive Yellow and Congo Red in the two-component system were both consistent with the pseudo-second-order kinetic models , with chemisorption being the rate-controlling step and the adsorption rates of Reactive Yellow and Congo Red were both higher than that of one-component system. Meanwhile, they were more consistent with the Langmuir monolayer adsorption models, with maximum adsorption capacities of 261.10 mg/g and 291.55 mg/g, respectively, a decrease of 56.66% and 54.52% compared to that in the one-component system.
研究领域:
环境科学
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化学工程
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材料科学
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DOI
高影响因子
ACS Catalysis
·
2024
·
IF 11.3
Decun Luo,Chun-Ran Chang,Zhun Hu
In this study, tetrabutylammonium bromide (TBAB) with a cationic radius of 4.94 Å was encapsulated in ZIF-8 with a pore size of 3.4 Å by a one-step method. The TBAB@ZIF-8 catalyst showed superior catalytic activity on the reaction of CO2 with propylene oxide (PO) than TBAB and the zeolitic imidazolate framework, respectively, showing a synergistic effect. The synergist effect was related with the compensation effect between the adsorption of CO2 and the loop-opening of PO, where ZIF-8 provided the active sites for CO2 adsorption and Br– in TBAB promoted the opening of the loop of PO. The catalytic performance of TBAB@ZIF-8 illustrated a volcano curve with the increase of the TBAB content. The addition of TBAB could have resulted in a positive effect on the loop-opening of PO. However, excessive TBAB hindered mass transfer and reduced the CO2 adsorption of ZIF-8, which was certified by the CO2 adsorption test. Diffuse reflectance infrared Fourier transform spectroscopy results showed that TBAB@ZIF-8 catalysts proceed in a new reaction pathway and that the rate-determining step of the reaction was the opening of the loop of PO. These results provided a guideline for the development of immobilization of homogeneous catalysts for CO2 fixation.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yu Zhu,Qinyun Xv,Dan Wang,Bingxin Sun,Yujia Wang,Zhiguo Han,Yongbo Gou,Jiayu Liu,Bingdong Li
The overuse of norfloxacin (NOR) has attracted wide attention because of the persistence and bio-accumulate in ecosystems and the negative impacts on human health. To solve the environmental issue, BiOI/TiO 2 p-n heterojunctions have been developed and decorated with a porous ZIF-8 to obtain novel hollow BiOI/TiO 2 /ZIF-8 heterojunctions, which were further characterized by XRD, SEM, HRTEM , XPS , BET, UV–vis DRS, photoluminescence , ESR , photocurrent and EIS analyses. The BiOI/TiO 2 /ZIF-8 heterojunctions exhibited evidently improved photocatalytic performance compared with pristine BiOI , TiO 2 and BiOI/TiO 2 composites under visible light irradiation. ZIF-8 plays a key role in both the enhancement of adsorption and the photocatalytic activity in NOR removal. ·O 2 - and ·OH radicals were the two dominating active species in the photocatalytic process according to the trapping experiments. In 2-BTZ system, large specific surface area, highly effective charge carrier migration with inhibiting recombination, more negative CB and positive VB to generate more active ·O 2 - and ·OH species resulted in superior photocatalytic activity. This work provides a new idea to design a kind of photocatalytic heterostructure with more active species for potential application in the field of environmental treatment.
研究领域:
环境科学
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材料科学
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光催化技术
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DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
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2019
·Vol. 38
·期 6
·638-643
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IF 2.804
Yang Xuan-He,Yao Yan-Qing,Huang Mu-Hua,Chai Chun-Peng
A bulk Poly(vinyl alcohol)/ZIF-8 (PVA/ZIF-8) porous composite with aligned porous structure was prepared by ice-templating method. The microstructure of PVA/ZIF-8 porous composites was characterized by scanning electron microscopy (SEM). The results showed that the composites had regular pore structure and ZIF-8 nanoparticles were evenly distributed on the skeleton of PVA. X-ray diffraction (XRD) test results showed that the crystalline structure of ZIF-8 was well preserved in the composites. The specific surface area of the composite was characterized by nitrogen adsorption/desorption test. The specific surface area of the composite was up to 1160 m 2 ·g t1 . PVA/ZIF-8 porous composites could also support a certain weight with almost no volume shrinkage. The carbon dioxide adsorption quantity of the composite was up to 11.3 cm 3 ·g t1 , proving that PVA/ZIF-8 porous composite has a good application prospect in the field of carbon dioxide adsorption.
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
JOURNAL OF SOLID STATE CHEMISTRY
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2022
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IF 3.656
Chenyang Qi,Jiang Li,Yayun Shi,Bowen Zhang,Tongdan Chen,Chen Wang,Qihang Liu,Xiaowei Yang
Ion sieving is essential for biological systems and membrane-based applications. At present, metal-organic framework (MOF) membranes are of great interest for use in ion separation, but it remains a great challenge to design high quality MOF membranes with a simple preparation process and desirable ion selectivity. Herein we fabricate a MOF composite membrane , containing highly penetrated ZIF-8 channels. The ZIF-8 channels are the dominant pathways for ion transport and display a good Li + /Mg 2+ sieving performance (Li + /Mg 2+ = 6.1). The simulation reveals that the Li + /Mg 2+ selectivity is associated with the significant disparity of transport energy barrier between them, which is caused by the different extent of ion dehydration in angstrom-scale ZIF-8 channels. This work provides an effective strategy to develop ionic sieving membranes based on penetrating MOF channels for lithium extraction.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF POROUS MATERIALS
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2015
·Vol. 22
·期 5
·1195-1203
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IF 1.108
Wu Qigang,Xu Rong,Li Jing,Zhang Qi,Zhong Jing,Huang Weiqiu,Gu Xuehong
The compact ZIF-69 membranes have been prepared by seeded growth method for the recovery of gasoline vapor which is a major challenge in the petrochemical industry. The membrane performances for separating N 2 /n-alkane mixtures at various operating conditions (e.g. trans-membrane pressure difference, operating temperature, feed concentration, and stage cut) were systematically investigated. The highest separation factor was 2.60 with the corresponding permeance of 5.02 × 10 −8 mol/(m 2 s Pa) for the N 2 /n-C 6 H 14 model mixtures. Moreover, the effects of n-alkane components (n-C 5 H 12 , n-C 6 H 14 , and n-C 7 H 16 ) on the separation performances were studied, and the separation factors followed α (N 2 /n-C 7 H 16 ) > α (N 2 /n-C 6 H 14 ) > α (N 2 /n-C 5 H 12 ), due to the different adsorption capacities of n-alkanes on ZIF-69 materials. The present work demonstrates that the ZIF-69 membrane is a highly promising candidate for the application in gasoline vapor recovery.
研究领域:
材料科学
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化学工程
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环境工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2023
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IF 9.5
Junhao Liu,Jinshi Yu,Xiaoyan Wang,Meng Cheng,Shuangqing Sun,Songqing Hu,Chunling Li,Zhikun Wang
Metal–nitrogen–carbon (M–N–C) catalysts obtained from zeolitic imidazolate frameworks (ZIFs) have great potential in the oxygen reduction reaction (ORR). Herein, based on the same three-dimensional (3D) topological structure of ZIF-67 and ZIF-8, ZIF-67 is grown on the ZIF-8 surface by the epitaxial growth method, and ZIF-8 is used as a sacrificial template to obtain a Co-embedded layered porous carbon nanocage (CoPCN) electrocatalyst. Meanwhile, the self-sacrificing template effectively improves the specific surface area of the porous structure and reduces the depletion of active sites. The CoPCN shows a high half-wave potential of 0.885 V and superior stability as well as excellent methanol resistance. Theoretical calculations demonstrate that the Co–N1–C2 sites of CoPCN effectively reduce the energy barrier of ORR. In addition, a zinc–air battery (ZAB) based on the CoPCN exhibits excellent peak power density (90 mW cm–2) and superior cycle performance. This work presents a novel idea in the design of ZIF precursor systems to synthesize efficient ORR catalysts.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Shiyang Li,Longdou Tu,Yeqiang Lu,Mingjie Lin,Junmei Ma,Chaojie Bai,Congjie Gao,Lixin Xue
A novel strategy was developed to build high-performance thin film composite (TFC) total heat exchange membranes (THEMs) by in situ growing ZIF-8 crystalline micro-leaves (ZIF-L) from Polyethyleneimine (PEI) coated on polysulfone (PSF) ultra-filtration substrates. It was found that flexible PEI polymeric chains could tightly cross-link and seal large masses of ZIF-L micro-leaves (ZIF/PEI wt. ratio up to 18.5) to thwart CO 2 permeation, on top of PSF substrate. Such PEI cross-linking could also effectively open up the internal channels of ZIF-L micro-leaves to enhance moisture permeance and latent heat recovery without trading off CO 2 gas barring property. ZIF-L in varied shapes protruded into the air stream could provide ultra-rough surfaces with increased surface area for improved total energy recovery efficiency. Optimized PEI/ZIF-L TFC THEMs showed ultra-low CO 2 permeance of 0.5–8 GPU and ultra-high total heat recovery rates of 68–74%.
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
NEW JOURNAL OF CHEMISTRY
·
2025
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IF 2.5
Zhile Xiong,Yuewen Chen,Weidong Xie,Jiali Huang,Xiaoli Zhang,Xiya Zhang,Hai Liu
The electrocatalytic reduction of CO2 using renewable electricity offers a sustainable approach for the production of valuable chemicals. However, this process is often hindered by low catalytic activity and poor selectivity. In this study, we have developed a novel electrocatalyst that integrates ZIF-8-regulated ZnO interfaces, undercoordinated surface sites, and mesoporous nanostructures. This design enabled the ZnO/ZIF-8 catalyst to achieve excellent CO2 conversion performance, with a CO2 Faraday efficiency of more than 91% over the potential range of -1.0 V to -1.6 V and a high current density compared to reversible hydrogen electrodes. At the optimal potential of -1.4 V, the CO Faraday efficiency reaches 95.57%, accompanied by a current density of -8.16 mA/cm2. The porous nature and superior CO2 adsorption ability of the ZIF-8 shell layer foster an optimal setting for CO2 conversion while enhancing the exposure of active sites. Additionally, the synergistic coupling of ZnO and ZIF-8 interfaces fine-tunes the electronic structure of the active sites, thereby enhancing CO2RR efficiency.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Catalysts
·
2021
·Vol. 11
·期 8
·934
·
IF 4.146
Yong Cheng,Xiuxiu Wang,Yu Mei,Dan Wang,Changchun Ji
Considering the photocatalytic performance of CDs, ZnO, and the unique porous nanostructure and stability of ZIF-8, we prepared ZnCDs/ZnO@ZIF-8 zeolite composites. The resultant material represented an enhanced ability for the photodegradation of TC compared with that of ZnCDs and ZnO. The photocatalytic degradation efficiency reached over 85%. The catalytic activity of the composites was maintained after four cycles. The experimental result indicated that ⋅O2radical was the active species in the reaction.Keywords:carbon dots;zeolite composites;photocatalytic;tetracycline
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2016
·Vol. 3
·期 24
·1600725
·
IF 3.365
Xiu Dai,Yu Cao,Xiaowei Shi,Xinlong Wang
In this study, the nanoparticles of metal–organic framework ZIF-8 are incorporated into the poly(lactic acid) (PLA) to prepare the nanocomposite electrospun membrane. The diameter and the surface roughness of the fibers can be successfully controlled by increasing the content of ZIF-8 in the membranes. The prepared PLA/ZIF-8 membranes have increased oil wettability and significantly improved mechanical property compared with pure PLA membrane. The tensile strength, stain at break of PLA/ZIF-8 membrane with 0.5 wt% ZIF-8 are increased to 5.02 MPa and 88.81% compared to 2.77 MPa and 57.89% for pure PLA membranes, respectively. The PLA/ZIF-8 membranes are proved to be good candidate for oil/water separation with high efficiency because of the fast oil wetting ability, the roughness of fibers, and the adsorption effect of the porous ZIF-8 nanoparticles.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2022
·Vol. 9
·期 15
·e202200438
·
IF 4.782
Beibei Yang,Mengjiao Shao,Yufeng Xu,Yanyan Du,Hualing Yang,Duan Bin,Baohong Liu,Hongbin Lu
Graphical A novel electrochemical sensor based on core-shell ZIF-8@ZIF-67-derived Co nanoparticles/N-doped carbon nanotube polyhedron composites has been designed for the efficient determination of antibiotic drug chloramphenicol. In this work, we developed a highly selective detector towards the antibiotic drug chloramphenicol (CAP) using Co nanoparticle, which are grown in situ on N-doped carbon nanotube polyhedra (Co@NCNP), which are obtained by a pyrolysis strategy derived from core-shell ZIF-8@ZIF-67. Physical characterization verified that metal-organic framework (MOFs)-derived Co@NCNP nanocomposites present a nanotube structure on their mesoporous polyhedron surface. As a result, the as-prepared Co@NCNP can be used as a sensitive electrochemical sensor for chloramphenicol detection, and the modified electrode is also studied by electrochemical methods such as electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and differential pulse voltammetry (DPV). When compared with single ZIF-67-derived electrode, the Co@NCNP displays a higher electrocatalytic activity in the presence of chloramphenicol. Moreover, an excellent performance with a linear response range of 5–268.83 μM and a low detection limit of 0.5 μM (S/N=3) is observed for the Co@NCNP modified electrode. Finally, the fabricated chloramphenicol sensor achieves a good anti-interference ability, stability, excellent repeatability, and remarkable reproducibility. The sensor also could be applied in human serum to determine of chloramphenicol with a satisfactory result.
研究领域:
材料科学
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电化学
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分析化学
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纳米技术
✓ 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）