FOOD CHEMISTRY
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2020
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IF 6.306
Hai-Long Jiang,Quan-Bin Fu,Ming-Lin Wang,Jin-Ming Lin,Ru-Song Zhao
In this study, a novel porous composite (Fe 3 O 4 @TAPB-COF@ZIF-8) consisting of metal–organic and covalent organic frameworks was developed and applied to the magnetic solid-phase extraction (MSPE) of bisphenols. The extraction parameters such as the extraction time, solution pH, amounts of adsorbent, and ionic strength were investigated to obtain the best extraction conditions. By optimizing the MSPE, a convenient and sensitive analytical method was established in combination with high-performance liquid chromatography. The method achieved low detection limits (0.04–0.05 ng mL −1 ), wide linear range (0.25–1000 ng mL −1 ), good repeatability (1.20–4.30%), good reproducibility (1.34–4.03%), and satisfactory recoveries of four functional beverages (66.2–116.6%).
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ENVIRONMENTAL RESEARCH
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2020
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IF 5.715
Qingshan Fu,Lei Zhang,Haifei Zhang,Xuedan Chen,Mingtian Li,Min Gong
Various nanoporous particles, nanofibers have been employed for adsorptive removal of dyes from wastewater. However, these nanomaterials are difficult in separation from solution, generally by centrifugation or filtration. These processes are tedious and will limit the upscale applications. Herein, a hierarchically porous carbon monolith has been fabricated on grounds of ice and metal organic framework (MOF) templating method. The prepared carbonaceous monolith exhibited abundant ice-templated macropores , MOF-templated micropores and mesopores, and a high BET (Brunauer-Emmett-Teller) special surface area (530 m 2 g −1 ). The monolith achieved an MB (methylene blue) adsorption capacity of 95.82 mg g −1 (10 mg adsorbent/5 mL aqueous dye solution) and a theoretic maximum value of 179.86 mg g −1 by the Langmuir model. Compared with MB, the adsorption capacity for MO (methyl orange) was lower. Several adsorption kinetics and isotherms models were used for analysis of adsorptive data, and the results demonstrated the adsorption of MB and MO on the porous carbon monolith is a spontaneous endothermic physisorption process, which was mainly controlled by electrostatic reaction. Importantly, the monolith could be easily picked up using tweezers and used for recycling tests. After four cycles, the 94% of the initial adsorption capacity for MB can be retained.
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OPTICAL MATERIALS
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2020
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IF 2.779
Meini Wu,Yixi Zhuang,Jianbin Liu,Wenwei Chen,Xinya Li,Rong-Jun Xie
Bacillus anthracis is an extremely dangerous bacterium with high morbidity and mortality. It is thus of great importance to detect Bacillus anthracis or its major biomarker 2,6-pyridine dicarboxylic acid (DPA) in a rapid and sensitive way. Althought metal-organic frameworks (MOFs) have found great applications in catalysis and sensing; nevertheless, there are only a few fluorescent MOFs can be used in DAP detections, and the key factors determining the detection sensitivity is not clear yet. In this study, we successfully synthesized a novel nano-sized dual-emitting lanthanide MOF, namely Eu/Tb(BTC), for the high-sensitivity DPA detection. The synthesized Eu/Tb(BTC) showed a remarkable sensitivity, excellent selectivity , and a high accuracy. Through comprehensive characterizations of the microstructure, luminescence properties, and sensing performance of products with different Eu/Tb ratios, the unique capability as a sensitive fluorescent probe (limit of detection 1087 nM) for selectively detecting DPA was demonstrated. More importantly, a possible route to control the sensitivity of detection by controlling the original energy transfer efficiency between Eu 3+ and Tb 3+ was revealed. This work not only provides an excellent nano-probe for qualitative and quantitative detection of biomarker of Bacillus anthracis, but also reveals an important rule for improving the sensitivity of sensing systems.
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NATURE MATERIALS
·
2020
·Vol. 19
·期 5
·552-558
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IF 38.663
Bi Sheng,Banda Harish,Chen Ming,Niu Liang,Chen Mingyu,Wu Taizheng,Wang Jiasheng,Wang Runxi,Feng Jiamao,Chen Tianyang,Dincă Mircea,Kornyshev Alexei A.,Feng Guang
We performed constant-potential molecular dynamics simulations to analyse the double-layer structure and capacitive performance of supercapacitors composed of conductive metal–organic framework (MOF) electrodes and ionic liquids. The molecular modelling clarifies how ions transport and reside inside polarized porous MOFs, and then predicts the corresponding potential-dependent capacitance in characteristic shapes. The transmission line model was adopted to characterize the charging dynamics, which further allowed evaluation of the capacitive performance of this class of supercapacitors at the macroscale from the simulation-obtained data at the nanoscale. These ‘computational microscopy’ results were supported by macroscopic electrochemical measurements. Such a combined nanoscale-to-macroscale investigation demonstrates the potential of MOF supercapacitors for achieving unprecedentedly high volumetric energy and power densities. It gives molecular insights into preferred structures of MOFs for accomplishing consistent performance with optimal energy–power balance, providing a blueprint for future characterization and design of these new supercapacitor systems.
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Journal of the Taiwan Institute of Chemical Engineers
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2021
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IF 5.876
Wenbo Liu,Jiabin Zhou,Dan Liu,Su Liu,Xianjie Liu,Shuang Xiao,Choujing Feng,Changhong Leng
Background The combination of Fenton catalyst and photocatalyst will lead to the decrease in light absorption on the photocatalyst, and it is difficult for Fe 3+ to be converted into Fe 2+ on the Fenton catalyst, resulting in poor Fenton-like process and photocatalysis effect. Preparing catalysts containing oxygen vacancies (OVs) can simultaneously increase the light absorption and the cycle of Fe(Ⅲ) to Fe(Ⅱ) to improve the catalytic efficiency of Fenton-like process and photocatalysis. Methods A mesoporous H-MIL53 with OV was constructed by ligand selective pyrolysis. The formation mechanism of H-MIL-53 vacancy was analyzed by XPS, EPR, FTIR and TG. Significant findings XPS, EPR, FTIR and TG showed that calcination caused the fracture of Fe-O bond resulted in OV and coordinative unsaturated Fe site. H-MIL-53 showed higher degradation efficiency of tetracycline hydrochloride (93%) and high recycling performance. The electron-rich OV could activate the dissolved oxygen to produce •O 2 − through phot-introduced electrons, while the electron-poor iron site can activate H 2 O 2 to produce •OH. These results provide a new direction for the construction of metal-organic framework (MOF) containing OV for application in Fenton-like process and photocatalysis.
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RSC Advances
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2021
·Vol. 11
·期 47
·29527-29536
·
IF 3.361
Lian Sun,Quanchao Gu,Honglei Wang,Jinshan Yu,Xingui Zhou
A high-temperature proton exchange membrane was fabricated based on polyvinylidene fluoride (PVDF) and polyvinylpyrrolidone (PVP) blend polymer nanofibers. Using electrospinning method, abundant small ionic clusters can be formed and agglomerated on membrane surface, which would facilitate the proton conductivity. To further enhance the conductivity, phosphoric acid (PA) retention as well as mechanical strength, sulfamic acid (SA)-doped metal–organic framework MIL-101 was incorporated into PVP-PVDF blend nanofiber membranes. As a result, the anhydrous proton conductivity of the composite SA/MIL101@PVP-PVDF membrane reached 0.237 S cm−1 at 160 °C at a moderate acid doping level (ADL) of 12.7. The construction of long-range conducting network by electrospinning method combined with hot-pressing and the synergistic effect between PVP-PVDF, SA/MIL-101 and PA all contribute to the proton conducting behaviors of this composite membrane.
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Frontiers in Cell and Developmental Biology
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2021
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IF 6.684
Wang Meng,Liu Haoyu,Zhang Xu,Zhao Wenbo,Lin Xiaoyan,Zhang Fei,Li Danyang,Xu Chengpeng,Xie Fei,Wu Zhen,Yang Qibing,Li Xiangzhi
Hypoxia-inducible factor-1α (HIF-1α) promotes oncogenesis in hepatocellular carcinoma and is functionally linked to cell proliferation, chemoresistance, metastasis and angiogenesis. It has been confirmed that the low expression level of Males absent on the first (MOF) in hepatocellular carcinoma leads to poor prognosis of patients. However, potential regulatory mechanisms of MOF in response to hypoxia remain elusive. Our results demonstrate that MOF expression is negatively associated with HIF-1α expression in hepatocellular carcinoma tissues and in response to chloride-mimicked hypoxia in hepatocellular carcinoma cell lines. MOF regulates HIF-1α mRNA expression and also directly binds to HIF-1α to mediate HIF-1α N-terminal lysine acetylation, ubiquitination and degradation, with downstream effects on MDR1 levels. Functional inactivation of MOF enhances HIF-1α stability and causes cell tolerance to hypoxia that is insensitive to histone deacetylase inhibitor treatment. Dysfunction of MOF in hepatocellular carcinoma cells also results in chemoresistance to trichostatin A, sorafenib and 5-fluorouracil via HIF-1α. Our results suggest that MOF regulates hypoxia tolerance and drug resistance in hepatocellular carcinoma cells by modulating both HIF-1α mRNA expression and N-terminal acetylation of HIF-1α, providing molecular insight into MOF-dependent oncogenic function of hepatocellular carcinoma cells.
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CHEMICAL PHYSICS LETTERS
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2021
·
IF 2.328
Hao Liu,Yayun Zhao,Chen Zhou,Bin Mu,Liang Chen
A reliable strategy of Zr-based metal–organic framework (Zr-fum-fcu-MOF) was successfully achieved by microwave-assisted synthesis. Well-shaped and octahedral Zr-fum-fcu-MOF particles were obtained at 100 °C for 1.0 h with 150 equivalents of FA per ZrOCl 2 ·8H 2 O. A clear difference for the adsorption behavior of iso -C 4 H 10 (1.11 mmol/g) and n-C 4 H 10 (3.56 mmol/g) was observed at 25 °C and 1.0 bar. Moreover, 3.16 mmol/g CO 2 uptake was also obtained at 0 °C and 1.0 bar while the adsorption capacity of CH 4 and N 2 is 0.85 mmol/g and 0.21 mmol/g, respectively. This indicates that Zr-fum-fcu-MOF is a promising candidate for CO 2 capture.
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Journal of Chemistry
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2021
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IF 2.506
Renjie Zhou,Gui Chen,Yuejun Ouyang,Hairui Ni,Nonglin Zhou,Bailin Xiang
Using MOF-5 as a template, the porous carbon (MDPC-600) possessing high specific surface area was obtained after carbonization and acid washing. After MDPC-600 was loaded with Cu ions, the catalyst Cu/MDPC-600 was acquired by heat treatment under nitrogen atmosphere. The catalyst was characterized by X-ray powder diffraction (XRD), N2 physical adsorption (BET), field emission electron microscope (SEM), energy spectrum, and transmission electron microscope (TEM). The results show that the Cu/MDPC-600 catalyst prepared by using MOF-5 as the template has a very high specific surface area, and Cu is uniformly supported on the carrier. The catalytic hydrogen peroxide oxidation reaction of phenol hydroxylation was investigated and exhibits better catalytic activity and stability in the phenol hydroxylation reaction. The catalytic effect was best when the reaction temperature was 80°C, the reaction time was 2 h, and the amount of catalyst was 0.05 g. The conversion rate of phenol was 47.6%; the yield and selectivity of catechol were 37.8% and 79.4%, respectively. The activity of the catalyst changes little after three cycles of use.
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Journal of Chemistry
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2021
·
IF 2.506
Qiuyun Zhang,Xianju Yang,Jiali Yao,Jingsong Cheng
The impregnation of phosphotungstic acid (HPW) with porous cobalt-cerium oxide (HPW@CoCeO) has been prepared by pyrolysis of CoCe-MOF and used for the production of methyl oleate from oleic acid and methanol. FTIR, XRD, SEM, TEM, N2 adsorption/desorption, and NH3-TPD were characterized for the prepared composites. Simultaneously, the effects of reaction time, substrate molar ratio, temperature, and catalyst loading on catalytic activity were highlighted, and the conversion of 67.2% was reached after 4 h at 60°C. Importantly, HPW@CoCeO was reusabe and reused more than eight times, and the oleic acid conversion could be maintained at 61.8% without significant activity loss. Thus, the HPW@CoCeO composite could be used as acid catalysts for sustainable energy production.
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APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Ya-yun Li,Qiuming Zou,Zhangjian Li,Dong Xie,Yuan Niu,Jizhao Zou,Xierong Zeng,Junfeng Huang
Bimetallic electrocatalysers have attracted dramatic attentions in recent years owing to their unique electronic configuration, charge transfer efficiency and synergistic effect. Ni-Fe based alloys are considerable as one of the most promising materials with superior electrocatalytic performance since the outstanding oxygen reaction activity of iron and the strong capability of nickel. Herein, Ni-Fe MOF derived Ni-Fe alloys embedded graphitic carbon electrocatalyst is synthesized as bifunctional oxygen electrocatalyst with hierarchical porous structure and superior oxygen reaction electrocatalytic performance. The onset potential and the half-wave potential of Ni 0.6 Fe 0.4 CM in oxygen reaction are 0.88 V and 0.75 V, respectively, which are superior than those of commercial Pt/C. Furthermore, a low overpotential of 320 mV at 10 mA/ cm 2 is obtained in oxygen evolution reaction, which is well consistent with that of commercial RuO 2 . In the meantime, excellent long-term stability and anti-methanol ability endow Ni 0.6 Fe 0.4 CM exhibiting brilliant electrocatalytic performance as commercial Pt/C and RuO 2 . The assembled Zn-air battery exhibits smaller voltage gap (0.76 V) than that for commercial Pt/C and RuO 2 , and it has remarkable stability around 170 cycles in the discharge–charge test. These results summarize the merits of bimetallic electrocatalysers for bifunction electrochemical performance and promote the development of electrocatalytic applications.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Shiqi Wang,Wenyi Huo,Feng Fang,Zonghan Xie,Jian Ku Shang,Jianqing Jiang
Recently, high entropy alloy (HEA) based materials have been vigorously explored as viable catalysts in water electrolysis for their unique properties. However, the synthesis of efficient and robust high entropy catalysts remains a challenge. Here a facile and scalable approach is reported to synthesize advanced HEA (CoNiCuMnAl)/C nanoparticles from the polymetallic Metal–organic framework (MOF). The novel core-shell nanoarchitectures feature face-centered cubic HEA wrapped in ultra-thin carbon shell. The optimized catalyst (deposited upon Ni foam) boosted alkaline Oxygen evolution reaction (OER) (in 1.0 M KOH) with an ultralow overpotential of 215 mV at 10 mA/cm 2 (also by a low Tafel slope of 35.6 mV dec −1 ). The enhanced performance is closely tied to surface reconstruction (i.e., formation of oxyhydroxide catalytic active species) and the high entropy effect, revealed by Fourier-transformed alternating current voltammetry (FTACV) and in-situ Raman spectrum analysis, in conjunction with Density Functional Theory (DFT) computations. Furthermore, the new design showed excellent long-term OER stability with negligible decay through 30 h testing (under 200 mA cm −2 ). The present work demonstrates the feasibility and advantage of utilizing highly efficient and durable high entropy alloys for catalyzing electrochemical water splitting process.
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