ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Chenghan Ji,Hang Yu,Junhe Lu,Yi Ren,Lu Lv,Weiming Zhang
Adsorption as a desalination approach has the advantages of energy efficiency, low cost, and operational convenience, but its practical application is limited by low desalination capacity, consumption/disposal of strong acids/bases as regeneration reagents, and poor reusability. Herein, we synthesized a thermo-regenerable salt absorbent by grafting ethylenediaminetetraacetic acid (EDTA) onto a metal–organic framework (MOF), MOF-808-EDTA, which could rapidly adsorb NaCl within 30 min from saline water at 25 °C with a desalination capacity as high as 9.4 mmol/g. Moreover, the saturated adsorbent could be facilely regenerated in 80 °C water. Fourier transform infrared spectroscopy and derivative thermogravimetry revealed that temperature-regulated proton transfer between amino and carboxyl groups was the mechanism of thermo-regeneration. EDTA on MOF-808-EDTA appears in a zwitterionic state in water at room temperature, which allowed simultaneous adsorption of Na+ and Cl–. At elevated temperature, it returned to a nonionic state accompanied by the desorption of ions. A similar temperature-dependent adsorption–regeneration process was also observed for other salts, including LiCl, KCl, CaCl2, and MgCl2. Column experiments of brackish groundwater showed that 1 g of MOF-808-EDTA could produce ∼106 mL of fresh water (total dissolved solids < 600 mg/L) without significant capacity loss after 10 successive adsorption–regeneration cycles. This study is the first to propose an EDTA-based MOF for desalination and indicates the potential of MOF-808-EDTA as a green adsorbent for sustainable water desalination.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Ailin Li,Jian Xiong,Ye Liu,Liming Wang,Xiaohong Qin,Jianyong Yu
Solar vapor generation (SVG) has been considered as a promising approach to alleviate the water crisis. However, solar vapor generation from wastewater causes secondary pollution since the contaminants cannot be efficiently separated from the remained wastewater. Here we demonstrate a novel fiber-intercepting-particle structured MOF fabric by integrating spraying process with electrospinning technique for simultaneous solar vapor generation and organic pollutant adsorption. The fabrication strategy not only maintains the inherent pore structure of ZIF-67 particles, but also enables photothermal functionalization of the nanofiber scaffold, offering distinct advantages over the commonly used co-electrospinning and surface decoration methods. As a result, the prepared fiber-intercepting-particle structured MOF fabrics achieve a high solar absorption of 94.2%, fast evaporation rate of 1.50 kg m −2 h −1 and ultrahigh malachite green (MG) adsorption capacity of 198.1 mg g −1 under one sun. Furthermore, the contaminant removal efficiency of MG is as high as 99.9% with the assistance of solar irradiation. The structure design of MOF fabrics and SVG-enhanced adsorption strategy for water purification in this work will inspire the development of superior water treatment technology.
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CARBON
·
2021
·
IF 9.594
Fei Wu,Qiang Li,Zihao Liu,Tariq Shah,Mudasir Ahmad,Qiuyu Zhang,Baoliang Zhang
In recent years, carbon materials derived from metal-organic frameworks (MOFs) have attracted much attention in the field of microwave absorption. It is challenging to prepare composite absorbers with a controllable binary MOF-on-MOF heterostructure . Here, we construct two binary hybrid MOF heterostructures through selective assembly strategies, and realizes their conversion to magnetic porous carbon materials through a simple carbonization process . The special hybrid structure of hexagonal pyramid column and octahedron depends on the selective growth of the guest MOF on the specific crystal facet of the host MOF. The microwave absorbing properties of carbonized UIO-66@Co-doped MIL-88B (UM) and DUT-52@Co-doped MIL-88B (DM) are systematically studied. The selectively combined heterogeneous components endow the absorber with hierarchical pore structures , optimal impedance matching and excellent electromagnetic attenuation capabilities. The products carbonized at 700 °C (UM-700 and DM-700) exhibit superior microwave absorbing properties. It is worth noting that only with a matching thickness of 2 mm, the minimum reflection loss (RL min ) of DM-700 exceeds −65.2 dB, and the effective absorption bandwidth (EAB, RL < −10 dB) covers 4.8 GHz. This work might provide a new strategy for rational design of absorbers with exquisite MOF-on-MOF heterostructures.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
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IF 6.953
Shahrzad Zirak Hassan Kiadeh,Azadeh Ghaee,Mehdi Farokhi,Jhamak Nourmohammadi,Addie Bahi,Frank K. Ko
Pectin has been regarded as a drug carrier accelerating the healing process due to its bioactivities, abundance and lower cost of resources. However, a big challenge related to its practical application is its poor mechanical strength. In this study the modified Cu-based MOF containing Folic acid was synthesized and incorporated in the suitable pectin electrospun nanofibers which not only improved the copper ions release behavior but also made the fiber mat stronger, antibacterial and induce angiogenesis , fibroblast migration, and proliferation due to loaded copper ions and folic acid. The nanofibers composing of 75% pectin and 4000 kDa -PEO were chosen after morphological and mechanical characterization. Finally, the effect of MOF incorporation on the nanocomposite samples was characterized in terms of morphological, physiochemical and biological properties. The nanofibrous mats were evaluated by tensile testing, antibacterial and cytotoxicity. The release behavior of copper ions and folic acid was controlled and their burst release alleviated reducing cytotoxicity in vitro . It was found that the Young's moduli of the pectin nanofibers were improved to 19.13 MPa by the addition of Cu-based MOFs. Moreover, nanocomposite pectin nanofibers were found to be antibacterial and biocompatible. These results demonstrate that MOF-contained pectin nanofibers are promising for biomedical applications.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 41
·17671-17678
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IF 3.288
Saira Shams,Waqas Ahmad,Amjad Hussain Memon,Sumaira Shams,Yun Wei,Qipeng Yuan,Hao Liang
The objective of this study was to design a more effective antibacterial agent to overcome the problem of fast-growing bacterial resistance. The results showed that a Cu/H3BTC metal–organic framework (MOF) exhibited a notable antibacterial performance towards Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli), and could significantly disrupt the cell membrane, resulting in the discharge of cell constituents. In addition, morphological changes were elucidated using scanning electron microscopy (SEM). SEM photographs demonstrated noticeable and apparent changes in the morphology of bacterial cells, signifying cell damage that was further confirmed via confocal laser scanning microscopy (CLSM). Furthermore, the result of agarose gel electrophoresis (AGE) showed that Cu/H3BTC MOF could enter the bacterial cells by impairing cell membranes and inhibiting the synthesis of DNA. These findings indicated that the Cu/H3BTC MOF is a potent antimicrobial material that can be applied to hinder the growth of pathogenic microbes.
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高影响因子
CARBON
·
2020
·
IF 8.821
Qiao Zhao,Shouying Huang,Xiaoxue Han,Jiajia Chen,Junhu Wang,Alexandre Rykov,Yue Wang,Meiyan Wang,Jing Lv,Xinbin Ma
N-doped carbon materials as catalyst supports have shown great superiority because of rich porosity, tunable metal-support interaction and electronic promotion effect. Controllable fabrication of carbon materials with specific morphology and different configurations provides wider possibilities for applications in catalysis. Herein, N-doped carbon nanosheets (CNS) were successfully synthesized by using monoclinic ZIF-8 nanosheets as templates. Compared with commercial active carbon and cubic ZIF-8 particles-derived carbon particles , the derived CNS exhibit superior graphitization degree and electronic effect. Consequently, the promoted Fe carburization improved the intrinsic activity for Fe/CNS catalysts in FTS . Further investigation on pyrolysis temperature achieved tunable configuration and content of N dopant . XPS , Raman, Mössbauer spectroscopy , TEM, H 2 -TPR etc. were combined to elucidate the promotion effect of CNS on dispersion, electronic properties and formation of Fe carbides . By correlating the composition and structure to catalytic performance in FTS, we illustrated the significance of carbon materials in Fe supported catalysts.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Yuanyuan Guo,Qi Huang,Junyang Ding,Li Zhong,Ting-Ting Li,Yue Hu,Jinjie Qian,Shaoming Huang
The exploration and development of cost-effective and highly stable electrocatalysts with the highest possible energy efficiency remain a constant pursuit in the catalyst design and synthesis for electrocatalytic hydrogen evolution reaction (HER). In this work, a convenient approach is proposed to synthesize a type of ultrafine Mo 2 C nanoparticles in average sizes of 3–4 nm embedded in hierarchically porous N-doped carbon material calcined from bimetallic ZnMo-MI (MI = 2-methylimidazole) is obtained at 1000 °C, denoted as ZnMo-MI-1000 . First of all, the crystalline hybrid metal-organic framework of ZnMo-MI is fabricated from zeolitic imidazolate framework of Zn-MI precursors via solvothermal reaction, in which the conversion from Zn-MI to ZnMo-MI occurs gradually over time. After calcination , the as-obtained ZnMo-MI-1000 sample shows a satisfying HER performance with the small overpotential of 83.0 mV in 0.5 M H 2 SO 4 and 100.1 mV in 1.0 M KOH to reach a current density of 10 mA cm −2 , which is attributed to ultrasmall Mo 2 C, Mo and N-doped graphitic carbon matrix. The multiporous network of ZnMo-MI-1000 can provide continuous mass transportation with a minimal diffusion resistance that produce effective electrocatalytic kinetics in both acidic and alkaline media , which is utilized as a highly active and durable nonprecious metal electrocatalyst for HER.
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Materials Advances
·
2020
·Vol. 2
·期 2
·692-699
·
IF 0
Fangyuan Gai,Dongying Zhu,Yunhuan Wu,Xiaogang Zhao,Changhai Liang,Zhenguo Liu,Yunling Liu,Tonghua Wang
Striking a balance between the nitrogen content and pore texture of N-containing metal–organic framework (MOF)-derived carbon is a considerable challenge for high-performance CO2 capture. The high-temperature pyrolysis and activation facilitated well-developed pore structures but resulted in serious nitrogen loss of MOFs. In this work, we developed MOF (ZIF-8)-derived N-doped porous carbons (NPCs) by integrating ZIF-8 with pomelo peel via a co-carbonization and activation process to construct a high-performance CO2 adsorbent. The pomelo peel can effectively prevent the nitrogen loss from the ZIF-8 backbone via pre-melting and polymerization and simultaneously offer the ideal porosity and BET surface area during the co-carbonization and activation process. By tuning the ZIF-8 loading capacity and the activation temperature, the sample NPC-800-4 prepared at 800 °C possessed both ultrahigh surface area (∼1967 m2 g−1) and high N content (∼13.15 wt%). Particularly, the CO2 capacity of NPC-800-4 reached 5.51 mmol g−1 at 25 °C and 9.01 mmol g−1 at 0 °C under 1 bar due to its relatively high content of pyrrolic-N (N5 ∼ 61.2%) and pyridinic-N (N6 ∼ 16.5%), as well as the proper pore size distribution (0.64 nm). In addition, the TPD measurement and CO2 adsorption energy (Qst) of NPC-800-4 also suggested the high desorption activation temperature and energy, indicating a strong binding capacity toward CO2. Moreover, NPC-800-4 exhibited almost constant CO2 uptake in 8 consecutive adsorption–desorption cycles, indicating that the sample with great stability and recyclability would be easily adapted and recycled from industries. This co-carbonization and activation strategy to assembly MOFs with biomass would pave the way for enhancing CO2 capture of MOF-derived carbons.
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Scientific Reports
·
2020
·Vol. 10
·期 1
·1-10
·
IF 3.998
Yang Aili,Wang Zhijun,Zhu Yukuan
A novel composite MOF@cotton fibre (HCF) was prepared and characterized by FTIR, SEM, XPS and TGA. The effect of various parameters on the adsorption efficiency, such as the solution pH, contact time, initial U(VI) concentration and temperature, was studied. The maximal sorption capacity ( Q m ) is 241.28 mg g −1 at pH 3.0 for U(VI) according to the Langmuir isotherm adsorption model, and the kinetic and thermodynamic data reveal a relatively fast entropy-driven process (Δ H 0 = 13.47 kJ mol −1 and Δ S 0 = 75.47 J K −1 mol −1 ). The removal efficiency of U(VI) by HCF is comparable with that of pure cotton fibre and as-prepared MOF (noted as HST). However, the HST composite with cotton fibre significantly improved the treatment process of U(VI) from aqueous solutions in view of higher removal efficiency, lower cost and faster solid–liquid separation. Recycling experiments showed that HCF can be used up to five times with less than 10% efficiency loss.
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ACS Omega
·
2020
·
IF 2.87
Xing-Lin Yang,Yu-Sheng Ye,Zhi-Meng Wang,Zao-Hong Zhang,Yi-Lie Zhao,Fan Yang,Zong-Yuan Zhu,Tao Wei
Polyoxometalate (POM)-based metal–organic framework (MOF)-derived Co3O4/CoMoO4 nanohybrids were successfully fabricated by a facile solvothermal method combined with a calcination process, in which a Co-based MOF, that is, ZIF-67 acts as a template while a Keggin-type POM (H3PMo12O40) serves as a compositional modulator. The materials were characterized through scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS) mapping, and electrochemical measurements. When the Co3O4/CoMoO4 nanohybrids were applied as anode materials for lithium-ion batteries (LIBs), they display large lithium storage capacity (around 900 mAh g–1 at 0.1 A g–1) and high cycling stability, and they can also exhibit good rate performances. This work might shed some light on the POM-based MOF host–guest synthesis strategy for the preparation of polymetallic oxides for enhanced electrochemical energy storage and further applications.
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Advanced Healthcare Materials
·
2021
·Vol. 10
·期 6
·2001369
·
IF 9.933
Yiyuan Xue,Zhou Zhu,Xin Zhang,Junyu Chen,Xiao Yang,Xiaomeng Gao,Shu Zhang,Feng Luo,Jian Wang,Weifeng Zhao,Chao Huang,Xibo Pei,Qianbing Wan
Owing to the insufficient guidance of new bone formation in orthopedic and craniomaxillofacial surgery, construction of a guided bone regeneration membrane to support vascularized bone regeneration remains a challenge. Herein, an electrospun asymmetric double-layer polycaprolactone/collagen (PCL/Col) membrane modified by metal–organic framework (MOF) crystals is developed. The optimization of the PCL/Col weight ratio (1:1 and 1:1.5) enables the composite membrane with a balanced tensile strength (only fell by 49.9% in wet conditions) and a controlled degradation rate (completely degraded at 12 weeks). The MOF crystals can provide a pH-responsive release of Zn 2+ ions. In vitro experiments indicate that the barrier layer functions to prevent the infiltration of fibrous connective tissue. The MOF crystal layer functions to enhance osteogenesis and angiogenesis in vitro. Using a rat calvarial defect model, the MOF crystals exhibit a sign of osteoinductivity along with blood vessel formation after 8 weeks post-surgery. Strikingly, when assessed in a chick chorioallantoic membrane model, the MOF modified membrane demonstrates a significant angiogenic response, which can be envisaged as its outstanding merits over the commercially Col membrane. Therefore, the MOF crystals represent an exciting biomaterial option, with neovascularization capacity for bone tissue engineering and regenerative medicine.
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CHEMOSPHERE
·
2020
·
IF 5.778
Pengfei Huang,Jiawei Lei,Zhirong Sun,Xiang Hu
Antibiotic contamination has already been one of hazards to aquatic environment due to the abuse of antibiotics. Metal-organic frameworks (MOFs) are known as a kind of promising porous material for solving the environmental deterioration. In this article, the physicochemical and electrochemical properties of a series of porous copper oxide carbon materials (CuOx-C) synthesized by carbonizing Cu-BTC were compared. Due to the suitable carbonization temperature, CuOx-C-550 N, whose geometric structure was similar to Cu-BTC, possessed a multiscale pore structure containing many mesopores and partial macropores in accordance with the pore size distribution curves. More copper/copper oxides were introduced toimproving the electrochemical ability, evidence by XRD , XPS, CV and EIS characterization. Moreover, the degradation of ceftazidime (CAZ) through anodic oxidation was discussed. In AO/CuOx-C-550 N system, the effects of current, solution pH, initial CAZ concentration and Na 2 SO 4 concentration were analyzed. CAZ removal rate reached 100% within 20 min under the optimal condition and a good electrocatalytic ability with 90% CAZ removal after 20 runs indicated a good electrochemical stability of CuOx-C-550 N. Furthermore, the degradation mechanism and pathway of CAZ were proposed. The Cu(II)/Cu(I) oxidation-reduction couples on the anodic surface contribute to the efficiently selective degradation of cephalosporins for CuOx-C-550 N. Overall, this study shows a good method to design and prepare a new MOF derivative for the remediation of aquatic contamination.
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