SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Xiulan Weng,Huijing Ma,Gary Owens,Zuliang Chen
Recently, bimetallic Fe-Pd nanoparticles were integrated with metal organic frameworks (MOFs) to produce a new composite catalyst with significant potential for organic contaminant removal due to enhanced adsorption and reduction. Here, 85.9 % of 2,4-dichlorophenol (2,4-DCP) was successfully removed from aqueous solution within 120 min when using a zinc-based zeolitic imidazolate framework (ZIF-8) embedded with Fe-Pd (Fe-Pd@ZIF-8). In comparison only 77.4 and 48.3 % was removed when using ZIF-8 or Fe-Pd alone. Thus, to better understand the function of composite components (ZIF-8 and Fe-Pd) in the removal of 2,4-DCP, and the specific removal mechanism involved, Fe-Pd@ZIF-8 was characterized before and after exposure to 2,4-DCP. This comparison revealed that 2,4-DCP was adsorbed onto the surface of the composite during exposure. Moreover, while ZIF-8 maintained stability following the removal of 2,4-DCP, Fe 0 was partially oxidized and Pd functioned as a catalyst in the removal process. Furthermore, kinetic studies demonstrated that the initial adsorption of 2,4-DCP conformed to a pseudo-second-order model and the subsequent reduction conformed to a pseudo-first-order model, whereas isothermal adsorption best fit the Freundlich adsorption model. This observation suggested that removal mechanism of 2,4-DCP involved both adsorption and dechlorination. Finally, Fe-Pd@ZIF-8 was applied to practically remove 2,4-DCP from wastewater, showing a 74.4 % removal efficiency which indicated that the composite was a potential new nanomaterial for practically removing organic contaminants from wastewater.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaoya Xu,Chengli Jiao,Xinxin Li,Xiaoqian Zhang,Lun Shu,Ge Su,Minghua Huang,Heqing Jiang
Metal-organic framework (MOF) membranes have emerged as promising candidates for hydrogen separation, but the fabrication of defect-free and flexible MOF membranes is still challenging. Here, we propose a thermally induced in-situ growth strategy to develop flexible membranes consisting of amorphous Zn-2-methylimidazole complex (a-Zn-MeIM) and crystalline zeolitic imidazolate framework-8 (c-ZIF-8) on polysulfone substrate, denoted as amorphous Zn-MeIM/crystalline ZIF-8 (a-Zn-MeIM/c-ZIF-8) membranes. During the thermal treatment of pre-sprayed mixture containing a-Zn-MeIM on the top surface of polysulfone substrate, a-Zn-MeIM is converted to c-ZIF-8. Similar coordination environments featured with Zn 2+ -2-methylimidazolate coordination configurations between flexible a-Zn-MeIM and rigid c-ZIF-8 provides enhanced interfacial compatibility, effectively eliminating cracks and grain boundary defects. Benefitting from both the flexibility of amorphous phase and well-defined pore structure of crystalline phase, the resulting a-Zn-MeIM/c-ZIF-8 membranes show flexibility and preferential diffusion of H 2 molecules. The membrane structure can be modulated by adjusting c-ZIF-8 concentration of sprayed colloid and thermal treatment temperature. The optimized a-Zn-MeIM/c-ZIF-8 3.75 membrane with flexibility exhibits a H 2 /CH 4 mixed separation selectivity up to 96.9 at 90°C. Additionally, a-Zn-MeIM/c-ZIF-8 3.75 membrane with an area of 644 cm 2 has been prepared, promoting the practical applications of MOF membranes with good processability.
研究领域:
材料科学
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化学工程
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膜技术
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2020
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IF 8.758
Hexiang Sun,Zachary Magnuson,Wenwen He,Weijie Zhang,Harsh Vardhan,Xiaolong Han,Gaohong He,Shengqian Ma
The desulfurization property of conventional mixed matrix membranes (MMMs) cannot meet the necessary demand due to particles aggregation and interface defects. Here, we put forward a layer-by-layer (LBL) approach to make a novel PEG@ZIF-8/poly(vinylidene difluoride)(PVDF) composite membrane for pervaporation desulfurization. In this way, a ZIF-8 layer is covered on the surface of the PVDF porous membrane via an in situ growth method. Then, a PEG layer is covered on the ZIF-8 layer by a casting method. Compared with pristine PEG membranes, the separation performance of the ZIF-8@PEG/PVDF nanocomposite membrane increased significantly. This can be attributed to the homogeneous ZIF-8 particle layer and better compatibility between the poly(ethylene glycol) (PEG) matrix and ZIF-8 particles. The membrane achieves a maximum total flux of 3.08 kg·m–2·h–1 at the third in situ growth cycles of ZIF-8 particles and a maximum sulfur enrichment factor of 7.6 at the sixth in situ growth cycles of ZIF-8 particles.
研究领域:
化学工程
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材料科学
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环境工程
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产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2024
·
IF 5.3
Xing Li,Jun Wang,Wanzhen Li,Feiyang Xu,Yuan Gao,Ting Cui,Kai Yang,Weiwei Zhang,Fei Ge,Yugui Tao
Tumors pose a significant threat to human well-being, presenting substantial risks to lives. Conventional approaches to cancer treatment exhibit limited efficacy in eliminating the disease, leading to undesirable outcomes and an increased likelihood of disease relapse. The application of chemotherapy and photothermal therapy has recently shown an increasing trend, owing to their limited negative effects and exceptional specificity. Chemotherapy can potentially induce a rapid reduction in tumors during initial treatment. However, it carries the risk of inducing drug resistance, ultimately contributing to tumor recurrence. Combination therapy offers more advantages, than single chemotherapy. Photothermotherapy and photodynamic therapy have gained significant public interest as innovative approaches to medical treatment. Nonetheless, gold nanorods demonstrate notable potential as exceptional photothermal agents in photothermal therapy. An acidic microenvironment is commonly found in tumors. With this factor considered, a tumor-specific cleavable material is used to encapsulate the drug for facilitating controlled release exclusively within the tumor microenvironment. The combination of dequalinium chloride and artesunate increases its selectivity toward mitochondria, enhancing its effectiveness as a chemotherapy agent. The gold nanorods were successfully employed to encapsulate the drug with ZIF-8, enabling precise transportation to the tumor location while preserving its stability. The therapeutic effectiveness of the treatment on mouse models with NCI-H1299 tumors was highly satisfactory, also demonstrating high biological safety, revealing its potential capabilities in cancer therapy. It provides a research basis for nanomaterials to inhibit tumors.
研究领域:
肿瘤学
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纳米医学
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药理学
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产品关联
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
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2016
·Vol. 40
·期 4
·954-961
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IF 2.741
Yilin Li,Tao Bao,Zilin Chen
In this work, we developed a capillary column modified with zeolitic imidazolate framework-8 as a novel stationary phase for open-tubular capillary electrochromatography. To immobilize zeolitic imidazolate framework-8 onto the inner surface of silica capillary, a bio-inspired polydopamine functionalization was used to functionalize the capillary surface with polydopamine. First, a polydopamine layer was assembled inside the capillary. Second, due to noncovalent adsorption and covalent reaction ability, polydopamine could attract and anchor zeolitic imidazolate framework-8 onto the inner surface of capillary. It has been demonstrated that zeolitic imidazolate framework-8 was successfully grafted on the inner wall of the capillary by scanning electron microscopy, and Fourier transform infrared spectroscopy. The electro-osmotic flow characteristics of capillaries were also investigated by varying the pH value and acetonitrile content of mobile phase. The zeolitic imidazolate framework-8 coating not only increased the phase ratio of open-tubular column, but also improved the interactions between tested analytes and the stationary phase. Three groups of isomers including acidic, basic, and neutral compounds were well separated on the zeolitic imidazolate framework-8 bonded column, with theoretic plate numbers up to 1.9 × 10 5 N for catechol. The repeatability of the prepared columns was also studied, and the relative standard deviations for intra- and interday runs were less than 5%.
研究领域:
分析化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
·
IF 3.171
Shuai Fan,Huiyuan Cheng,Manman Feng,Xuemei Wu,Zihao Fan,Dongwei Pan,Gaohong He
The conversion of CO 2 electrocatalytic hydrogenation into energy-rich fuel is considered to be the most effective way to carbon recycle. Nitrogen-doping carbonized ZIF-8 is proposed as carrier of the earth-rich Sn catalyst to overcome the limit of electron transfer and CO 2 adsorption capacity of Sn. Hierarchically porous structure of Sn doped carbonized ZIF-8 is controlled by hydrothermal and carbonization conditions, which induces much higher specific surface area than that of the commercial Sn nanoparticle (1003.174 vs. 7.410 m 2 ·g −1 ). The shift of nitrogen peaks in X-ray Photoelectron Spectroscopy spectra indicates interaction between ZIF-8 and Sn, which induces the shift of electron cloud from Sn to the chemical nitrogen to enhance conductivity and regulate electron transfer from catalyst to CO 2 . Lower mass transfer resistance and Warburg resistance are investigated through EIS, which significantly improves the catalytic activity for CO 2 reduction reaction (CO 2 RR). Onset potential of the reaction is reduced from −0.74 V to less than −0.54 V vs. RHE. The total Faraday efficiency of HCOOH and CO reaches 68.9% at −1.14 V vs. RHE, which is much higher than that of the commercial Sn (45.0%) and some other Sn-based catalyst reported in the literature.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
·
IF 3.171
Pascal Habimana,Yanjun Jiang,Jing Gao,Jean Bernard Ndayambaje,Osama M. Darwesh,Jean Pierre Mwizerwa,Xiaobing Zheng,Li Ma
The continuous use of chemical dyes in various industries, and their discharge into industrial effluents, results in severe problems to human life and water pollution. Laccases have the ability to decolorize dyes and toxic chemicals in industrial effluents as green biocatalysts. Their possible industrial applications have been limited by poor reusability, low stability, and loss of free laccase action. In this research, laccase was immobilized on zeolitic imidazolate framework coated multi-walled carbon nanotubes (Laccase@ZIF-8@MWCNTs) via metal affinity adsorption to develop an easy separable and stable enzyme. The optimum reaction conditions for immobilized laccase are at a pH of 3.0 and a temperature of 60 °C. The immobilized laccase was enhanced in storage and thermal stability. The results indicated that Laccase@ZIF-8@MWCNTs still maintained 68% of its original activity after 10 times of repeated use. Most importantly, the biocatalytic system was applied for decolorization of different dyes (20 mg·L −1 ) without a mediator, and up to 97.4% for Eriochrome black T and 95.6% Acid red 88 was achieved in 25 min. Biocatalysts with these properties may be used in a variety of environmental and industrial applications.
研究领域:
环境科学
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生物技术
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2023
·
IF 3.3
Yongmin Chen,Shulan Pu,Dongying Wang,Yongchao Zhang,Guojiang Wan,Qiang Zhao,Yan Sun
Zeolitic imidazolate framework-8 (ZIF-8) was coupled with AgBr using a facile deposition–precipitation method to synthesize AgBr@ZIF-8 composites. The photocatalytic activity of prepared photocatalysts was evaluated by the degradation of Rhodamine B (RhB). As expected, the photocatalytic activity of the AgBr@ZIF-8 photocatalysts was superior to that of ZIF-8 and AgBr. Among the AgBr@ZIF-8 photocatalysts, AgBr@ZIF-8 with a ZIF-8 loading of 5 wt% exhibited the highest photocatalytic efficiency of 99.5 % within 15 min. The remarkable photocatalytic activity of the AgBr@ZIF-8 composites was attributed to the heterojunction between ZIF-8 and AgBr, which reduced the recombination rate of electron-hole pairs, thereby enhancing the photocatalytic efficiency of the catalysts. According to the trapping experiment, superoxide radicals (•O 2 - ) and holes (h + ) were certified as the main species in the efficient removal of RhB.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiaming Wang,Minxin Shi,Yuanyuan Qin,Yuhua Huang,Xiancai Li,Xiaohua Cao
The enrichment and recovery of low concentration rare earth ions from wastewater resources has become an important research direction to achieve high quality utilization of rare earth resources. In this experiment, graphitic carbon nitride was used as the substrate, which was firstly compounded with Fe 3 O 4 to become magnetic graphitic carbon nitride material by alcohol heat method, and then in situ compounded with ZIF-8 in aqueous phase at room temperature to form the composite g-C 3 N 4 /Fe 3 O 4 @ZIF-8. Finally, the composite was characterized. The adsorption performance of g-C 3 N 4 /Fe 3 O 4 @ZIF-8 and the control g-C 3 N 4 /Fe 3 O 4 and ZIF-8 for La(III) under various conditions was investigated by adsorption experiment. In addition, the types and mechanism of La(III) adsorption were discussed by kinetic, isothermal adsorption line and thermodynamic modeling studies. Finally, the stability performance and reusability of the composite were evaluated by regeneration experiments. The result show that g-C 3 N 4 /Fe 3 O 4 @ZIF-8 has good adsorption performance on lanthanide ions. g-C 3 N 4 /Fe 3 O 4 @ZIF-8 reached adsorption equilibrium at about 20 min. When pH is 6 and the solid–liquid ratio of adsorbent is 0.25 g/L, the adsorption amount was 176.68 mg/g. g-C 3 N 4 /Fe 3 O 4 @ZIF-8 had good selectivity for lanthanum(III), and it retains 81 % of initial adsorption performance after five times of reuse.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2020
·Vol. 26
·期 35
·7918-7922
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IF 4.857
Yichen Zhou,Mingmin Jia,Xiongfei Zhang,Jianfeng Yao
Graphical Filling the voids : Etched ZIF-8 (ZIF-8-E) crystals permeated by open through pores of size about 100 nm have been introduced into a polyethersulfone membrane matrix. The resulting material shows enhanced CO 2 /N 2 separation performance (see scheme). Zeolite ZIF-8 has been etched with acid to form microporous ZIF-8-E crystals. These were then introduced into a polyethersulfone (PES) membrane matrix to enhance its CO 2 /N 2 separation performance. Open through pores of size about 100 nm formed in the ZIF-8 crystals allow the ingrowth of polyethersulfone chains, ensuring a reduction in the number of nonselective voids, thereby achieving better interaction between ZIF-8-E and PES. As a result, the CO 2 /N 2 separation performance of the ZIF-8-E/PES membrane increased significantly, showing a CO 2 permeability of 15.7 Barrer and a CO 2 /N 2 ideal selectivity of 6.5.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Changhai Fan,Zhengwang Xia,Haiqian Lian,Luogang Wu,Eryue Song,Jingxian Hua,Li Shen,Rujing Hou,Yichang Pan,Weihong Xing
The ZIF-8 membrane has emerged as a promising candidate for C 3 H 6 /C 3 H 8 separation. However, the feasibility of ZIF-8 membranes for applications has rarely been investigated with gas provided directly by the industry sector. Herein, the C 3 H 6 /C 3 H 8 mixture collected from the backend of the Hydrogen Peroxide to Propylene Oxide (HPPO) process was applied as feed gas to examine the separation performance of tubular ZIF-8 membranes. The membranes exhibited excellent separation performance and long-term stability under 9 bar and 50 °C. Noticeably, upon scaling up to a membrane area of 452.16 cm 2 by connecting six three-channel modules in series (multi-step membrane), its separation performance satisfied the C 3 H 6 circulation requirements during the HPPO process (purity ≥97.5 % and recovery rate ≥85 %). Furthermore, a simulation of membrane operation under industrial working conditions (22 bar and 56.3 °C) was performed. By fixing the separation factor at 15, a minimum membrane area of 800 m 2 met the requirements at the cost of membrane permeance with 120 GPU. The corresponding economic calculation indicated a maximum of 91.8 % annual capital cost saving compared with the distillation process, paving the way for the practical application of membranes.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Da Teng,Wenxiang Zheng,Lei Wu,Ghulam Murtaza,Zihui Meng,Lili Qiu
Formaldehyde and other harmful gases cause environmental pollution and threaten human health. Environment-friendly coatings is an effective strategy to address these environmental and health concerns. In this study, a large-scale amorphous photonic crystals (APC) based on modified ZIF-8 (H xh -ZIF-8) with photocatalytic degradation of formaldehyde and tunable structural color were designed for eco-friendly coatings by programmable smart manufacturing. As APC unit, H xh -ZIF-8 nanoparticles with controllable diameters were synthesized utilizing solvothermal method and the −N = C = O group was introduced with thermal oxidation. The results of photocatalytic degradation revealed that H 5h -ZIF-8, through thermal oxidation, exhibited a formaldehyde degradation rate 9.8 times than that of ZIF-8. The main reactive components in photocatalysis were holes (h + ) and superoxide radicals ( · O 2 – ), showcasing both stability and reproducibility. The color and brightness of the APC were adjusted by tuning the H xh -ZIF-8 diameter. The angle-independent APC ranging from red to purple were fabricated with 177, 165 and 235 nm H xh -ZIF-8 nanoparticles in various proportions with programmable smart manufacturing. In this study, a large-scale ZIF-8-based APC was designed with programmable smart manufacturing for environment-friendly coating, which combined environmental protection technology with structural color, and paved a new strategy for the development of multifunctional materials in air quality management.
研究领域:
材料科学
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环境科学
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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）