Advanced Composites and Hybrid Materials
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2021
·Vol. 5
·期 1
·91-103
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IF 5.693
Zhu Tengyang,Zhao Xiaoxu,Yi Ming,Xu Sheng,Wang Yan
To eliminate the interfacial defects between polymeric matrix and inorganic fillers in hybrid membranes, various strategies have been proposed by modifying membrane materials or optimizing membrane formation process. In this work, a ternary cross-linked PVA-APTES-ZIF-90 (PVA, poly(vinyl alcohol); APTES, 3-aminopropyltriethoxysilane; ZIF-90, zeolitic imidazolate framework-90) membrane was developed to eliminate interfacial defects between PVA and ZIF-90 for enhanced ethanol dehydration performance, where APTES served as a covalently linked bridge to cross-link PVA and ZIF-90 simultaneously. The morphologies and physicochemical properties of the resultant membranes were characterized by various characterization techniques. Moreover, we also explored the effects of [ZIF-90]/[APTES] mole ratio and [ZIF-90]/[APTES] loading on the separation performance of the trinity membranes. The results indicated that ZIF-90 particles showed better dispersion and compatibility in PVA-APTES-ZIF-90 trinity membranes than in PVA/ZIF-90 hybrid membrane, attributed to the ternary cross-linking among PVA, APTES, and ZIF-90. Compared with pristine PVA membrane, PVA-APTES-ZIF-90 trinity membranes showed stronger anti-swelling and mechanical properties, as well as more excellent separation performance, which resulted from the incorporation of cross-linker APTES and ZIF-90 particles. The separation factor of the optimal PVA-APTES-ZIF-90 trinity membrane was improved by 215.4%, up to 552, accompanied by a total flux of 82 g/m 2 h. Ternary cross-linking among cross-linker, inorganic filler, and polymeric chain is therefore believed to be a feasible strategy in preparing polymeric-based hybrid membranes with high separation performance. Graphical abstract Summary: A novel ternary cross-linked hybrid membrane with APTES as co-cross-linkers of ZIF-90 and PVA for efficient ethanol dehydration
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JOURNAL OF ELECTRONIC MATERIALS
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2021
·Vol. 50
·期 5
·2831-2839
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IF 1.938
Nie Jiajin,Li Zhitong,Shi Guifei,Wang Jing,Yao Shaowei
Fe-zeolitic imidazolate framework (ZIF)@C (Fe-ZIF wrapped by carbon) anode material has been manufactured. It has porous nanostructure, which can effectively shorten the distance of lithium ion transmission, thus achieving excellent rate performance, and can also reduce the volume expansion in the charging and discharging process, thus reducing the attenuation of capacity. The external carbon coating avoids direct contact between Fe-ZIF and the electrolyte, inhibits decomposition of the electrolyte, and impedes formation of the solid electrolyte interphase (SEI) film, thus obtaining higher reversible capacity in the cycling process. At a current density of 100 mA/g, Fe-ZIF@C achieves a high discharge capacity of 719 mAh/g after 100 cycles. This research shows that Fe-ZIF@C has potential for use as an anode material for lithium-ion batteries.
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BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2021
·Vol. 44
·期 6
·1309-1319
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IF 3.21
Guo Feng,Xu Zhonghao,Zhang Wendong,Wang Tongxin,Di Xiaoxuan,Zhang Qian,Zhu Zihan
Enzymes immobilized in metal–organic frameworks (MOFs) have attracted great attention as a promising hybrid material. In the study, a novel biomimetic mineralization encapsulation process for a highly stable and easily reusable catalase (CAT)@ZIF-8 composite has been designed. This immobilization process provides a high enzyme loading of 70 wt %. The CAT@ZIF-8 composites exhibited a much lower K m value and better enzyme activity than those of free CAT, exhibiting good stability against enzymatic hydrolysis and protein denaturation under harsh conditions. The inhibitory effects of pesticides such as pH, temperature, solvent (i.e., methanol, dimethyl sulfoxide and tetrahydrofuran) and storage at room temperature (6 months) on the activity of free and immobilized catalase enzyme were investigated. The CAT@MOF composites also exhibited excellent reusability, an obvious advantage for treating a wastewater from food processing. The CAT@MOF developed is promising for the efficient removal of H 2 O 2 under harsh conditions.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Qian Zhou,Bo Jin,Ping Zhao,Shijin Chu,Rufang Peng
Radioactive pollution is extremely harmful to humans and the environment and is difficult to manage. Therefore, finding an economical and efficient adsorbent for the treatment of uranium-contaminated wastewater is urgent. A composite carbon aerogel (CNQDs/rGO) was prepared by a simple one-step hydrothermal method by using CNQDs and graphene oxide as monomers. The ZIF-67 crystal was directly deposited on the template (expressed as CNQDs/rGO/ZIF-67 carbon aerogel (CGZCA)). The combination of CNQDs and graphene can not only graft some target groups (–OH, –COOH, and –NH-) onto the surface of 3D graphene carbon aerogels to promote adsorption, but also transform the zeta potential of rGO/ZIF-67 from positive to negative, which is more conducive to the adsorption process. The material observed by SEM and TEM shows that ZIF-67 and CNQDs are distributed on the carbon aerogel. The relationship of the adsorption of CGZCA to UO 2 2+ with contact time and initial concentration is examined. Results show that the adsorption of UO 2 2+ follows a pseudo-second-order kinetic model (R 2 = 0.999), and is consistent with the Langmuir adsorption isotherm model (R 2 = 0.991). The adsorption mechanism of the prepared adsorbent to UO 2 2+ is studied by XPS. Various parameters are studied in detail in the static adsorption experiment, and the removal of uranyl by adsorbents in different water bodies is simulated. In addition, dynamic adsorption behavior and adsorption effect of CGZCA on UO 2 2+ are investigated, which provides an appropriate reference basis for practical applications. Results show that the prepared ternary composite carbon aerogel is expected to be used in the extraction of uranium in wastewater and large-scale industrial production applications.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Huan Yang,Shuai Hu,Hui Zhao,Xiaofei Luo,Yi Liu,Chengfei Deng,Yulan Yu,Tianding Hu,Shaoyun Shan,Yunfei Zhi,Hongying Su,Lihong Jiang
Efficient removal of antibiotics from aqueous solution is of fundamental importance due to the increasingly severe antibiotic-related pollution. Herein, a high-performance Fe-ZIF-8-500 adsorbent was synthesized by Fe-doping strategy and subsequent activation with high-temperature. In order to evaluate the feasibility of Fe-ZIF-8-500 as an adsorbent for tetracycline (TC) removal, the adsorption properties of Fe-ZIF-8-500 were systematically explored. The results showed that the Fe-ZIF-8-500 exhibited ultrahigh adsorption capacity for TC with a record-high value of 867 mg g -1 . Additionally, the adsorption kinetics and isotherms for TC onto the Fe-ZIF-8-500 can be well-fitted by the pseudo-second-order kinetics model and the Freundlich model, respectively. The ultrahigh adsorption capacity of Fe-ZIF-8-500 can be explained by the synergistic effect of multi-affinities, i.e., surface complexation, electrostatic attraction, π-π interaction and hydrogen bonding. After being used for four cycles the adsorption capacity of Fe-ZIF-8-500 remains a high level, demonstrating its outstanding reusability. The ultrahigh adsorption capacity, excellent reusability, satisfactory water stability and easy-preparation nature of Fe-ZIF-8-500 highlight its bright prospect for removing tetracycline pollutant from wastewater.
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Journal of Physical Chemistry C
·
2021
·
IF 4.126
Pengfei Yao,Jing Cao,Xue Gong,Ce Han,Mingbo Ruan,Ping Song,Weilin Xu
The development of catalysts free of platinum-group metals with a high performance for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells is a grand challenge. Herein, we report zeolitic imidazolate framework-8-based Co, N, and S tridoped carbon frameworks (Co–N–S CFs) with high ORR catalytic activity and remarkable durability in an alkaline medium. Results indicate that the high ORR performance of the Co–N–S CFs could be attributed to the unique 3D structure of carbon frames, the synergistic effect among Co, N, and S, and its high electron conductivity. It is also found that the N and S doped heteroatoms can anchor Co atoms by forming CoNx and CoSx active sites for a highly efficient ORR. The results obtained here can help in the design and understanding of the cost-effective highly active Pt-free electrocatalysts.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
·
IF 6.953
Jie Zheng,Bingzhi Li,Yuan Ji,Yin Chen,Xun Lv,Xing Zhang,Robert J. Linhardt
Natural active polysaccharides are attracting increased attention from pharmaceutical industries for their valuable biological activities. However, the application of polysaccharides has been restricted due to their relatively large molecular weight, complex structure, and instability. Metal-organic frameworks (MOFs) have emerged to help deliver cargo to specific locations, achieving the objectives of eliminating the potential damage to the body, protecting the drugs, and improving therapeutic effectiveness. Here, a pH-responsive zeolitic imidazolate framework (ZIF-8) was synthesized to encapsulated three sulfated polysaccharides (heparin, fucan sulfate, fucosylated chondroitin sulfate) and a non-sulfated polysaccharide, hyaluronic acid. The resulting [email protected] biocomposites showed differences in terms of morphology, particle size, encapsulation, and release efficiency. These biocomposites retained antithrombotic activity and the framework ZIF-8 effectively protected these polysaccharides from degradation and prolonged shelf-life of the anticoagulants from the unfavorable environment.
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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.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Daile Zhang,Jianghua Zhang,Mingdi Pan,Yun Wang,Ting Sun
Electrochemical deposition is a facile technique to fabricate metal organic frameworks (MOFs) based materials in a short reaction time under mild conditions. In this work, novel necklace-like zeolitic imidazole framework@multiwalled carbon nanotubes (ZIF-8@MWCNTs) composite was synthesized by electrochemical method for the first time and then used as precursor for subsequent carbonization and acid treatment. The resultant porous carbon material (C-ZIF-8@MWCNTs) maintained the necklace-like structure with a high surface area of 1063.2 m 2 g −1 . When used as electrode material for supercapacitor , the C-ZIF-8@MWCNTs demonstrated a high specific capacitance of 259.2 F g −1 at the current density of 0.5 A g −1 . Further, the capacitance retention could reach 92% after 5000 cycles under the current density of 15 A g −1 . Due to the large specific surface area of the porous carbon derived from ZIF-8 and the intrinsic high conductivity, the C-ZIF-8@MWCNTs displayed good rate ability and cycle performance. The current work can expand the method to synthesize functional MOFs-based materials for advanced applications.
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JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Caijiao Yu,Yueyao Liang,Wenjuan Xue,Zhengqing Zhang,Xuemeng Jia,Hongliang Huang,Zhihua Qiao,Donghai Mei,Chongli Zhong
Metal-organic framework (MOF) membranes have significant potential for use in efficient gas separation. However, fabricating polymer substrate-supported ultra-thin MOF membranes with no defects remains a challenge. Herein, we proposed an in situ interface self-repair strategy for fabricating ultra-thin and defect-free ZIF-67 membranes for the first time. This was realized by preparing a polyvinyl alcohol (PVA)-Co 2+ interfacial layer containing a Co 2+ ion layer and a PVA-Co 2+ complex layer. The PVA-Co 2+ interfacial layer released Co 2+ ions and acted as a metal source to form ZIF-67 membranes by reducing the coordination rate of Co 2+ ions with 2-methylimidazole. The embedded Co 2+ ions functioned as anchor sites for the nucleation of ZIF-67 membrane assisted by the interface-enhanced deprotonation of 2-methylimidazole. Especially, the slow release of Co 2+ ions from the PVA-Co 2+ interfacial layer facilitated self-repair of defects to form a continuous and dense MOF layer. ZIF-67 membranes, 80-280 nm thick, were successfully synthesized and demonstrated unprecedented CO 2 permeance and good CO 2 /N 2 selectivity. This work provides a promising strategy for the fabrication of ultra-thin and defect-free MOF membranes on polymeric support layers for use in practical applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Zhenggang Wang,Jianwei Yuan,Renhao Li,Haipeng Zhu,Jingui Duan,Yanan Guo,Gongping Liu,Wanqin Jin
Compared with traditional separation methods, membrane-based technology shows advantages in energy efficiency for natural gas purification. To overcome the performance trade-off of conventional polymeric membranes, in this study, ZIF-301 MOF was employed as novel filler to fabricate 6FDA-DAM polyimide mixed-matrix membranes (MMMs) for CO 2 /CH 4 separation. A solvent exchange approach was proposed to remove the high-boiling-point solvent used for fabricating the MMMs. The microstructures and physico-chemical properties of the ZIF-301 fillers and ZIF-301/6FDA-DAM MMMs were characterized by SEM, EDX, XRD, IR, TGA, DSC and high-pressure sorption isotherms. The CO 2 /CH 4 transport properties through the MMMs were evaluated by permeation measurement at various feed pressures and analyzed by solution-diffusion model. The results showed that the incorporation of ZIF-301 into 6FDA-DAM enhanced both the CO 2 permeability and CO 2 /CH 4 selectivity, attributing to the preferential CO 2 sorption and aperture molecular sieving effect of the ZIF-301 filler. The MMM with optimal ZIF-301 loading of 20 wt% exhibited CO 2 permeability of 891 barrer and CO 2 /CH 4 of 29.3 that surpassed the 2008 Robeson upper-bound, suggesting that ZIF-301 based membrane could be a potential candidate for natural gas purification.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 6
·3095-3101
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IF 3.288
Yilin Yin,Jingchao Liu,Zengnan Wu,Ting Zhang,Zenghe Li
As one of the most essential semiconductors, ZnO has been widely used for solar cells, photocatalysis, environmental remediation, etc. Doping and morphology control of ZnO can significantly improve the efficiency of its photocatalytic performance. Tetracycline hydrochloride (TC) is widely used in medical and veterinary fields. Its excess use harms the environment and human health. Herein, we have successfully prepared Cu2O-doped ZnO with a porous structure by calcination using ZIF-8 as the precursor. After exposure to visible light (λ >420 nm) for 75 min, these photocatalysts exhibited a reasonable TC degradation rate (∼83.6%). Compared with ZnO, the Cu2O-doped ZnO introduces a p–n heterojunction and increases oxygen vacancies, which reduces the band gap and electron–hole recombination. Therefore, the photocatalytic efficiency for TC and PEC performance have been improved.
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