JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Yuanshuai Li,Yuting Wang,Liyan He,Lezu Meng,Haijun Lu,Xiaoli Li
In this work, a novel poly(4-vinylpyridine)-functionalized magnetic Al-MOF (Al-MOF-Fe 3 O 4 @P4VP) was synthesized successfully as an adsorbent for the adsorption of naproxen from aqueous solution. The resulting adsorbent was characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, vibrating sample magnetometer (VSM), BET surface area and X-ray photoelectron spectroscopy (XPS). Al-MOF-Fe 3 O 4 @P4VP had high surface area (123.68 m 2 /g), porous structure, rough surface and magnetic property. The maximum adsorption capacity of Al-MOF-Fe 3 O 4 @P4VP for naproxen could reach up to 31.67 mg/g and the adsorption process was well described by the Freundlich isotherm. The adsorption rate of naproxen on Al-MOF-Fe 3 O 4 @P4VP was very fast and the kinetics could be well modeled by the pseudo-second-order model. The adsorbent exhibited good adsorption ability even after ten adsorption-desorption cycles. Al-MOF-Fe 3 O 4 @P4VP had the characteristics of high removal efficiency, fast adsorption speed, good reusability and easy separation, making it a novel environment-friendly and effective magnetic nanomaterial in adsorbing naproxen from wastewater.
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ANALYST
·
2019
·Vol. 144
·期 22
·6617-6624
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IF 4.019
Jie Gao,Yingxu Chen,Weihao Ji,Zhonghong Gao,Jingdong Zhang
A composite of CdS nanoparticles and a europium metal organic framework (Eu-MOF) (CdS/Eu-MOF) was synthesized. The unique properties of MOFs help to improve the photoelectrochemical (PEC) properties of CdS by reducing charge carrier recombination and utilizing a broader spectrum for light harvesting. Under visible light illumination, the photocurrent of the CdS/Eu-MOF composite modified electrode was about 2.5-fold higher than that of the CdS modified electrode. When an ampicillin (AMP)-binding aptamer was immobilized on the CdS/Eu-MOF modified electrode as a recognition element, a self-powered PEC aptasensor exhibiting a specific photocurrent response to AMP was constructed. Several experimental conditions such as the ratio of CdS to MOF, the coating amount of the CdS/Eu-MOF suspension and the concentration of the aptamer were studied. Under optimum conditions, the photocurrent of the developed sensor was linearly related to the logarithm AMP concentration in the range of 1 × 10−10 to 2 × 10−7 M, with a detection limit (3S/N) of 9.3 × 10−11 M. Moreover, this sensor exhibited excellent selectivity, good repeatability and desirable stability. It was successfully applied to the detection of AMP in lake water and milk samples.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Aijuan Xie,Jie Zhang,Xiang Tao,Jianghui Zhang,Bingyan Wei,Wenhao Peng,Yuwei Tao,Shiping Luo
Nickel-based metal organic framework materials were first prepared by hydrothermal method and used as the precursor. Ni/nitrogen-carbon (Ni–N–C), Ni@NiO–N–C and NiO–N–C mixtures derived from metal organic skeleton were successfully prepared by controlling the heat treatment conditions and applied in the electrocatalytic oxygen evolution reaction (OER). Through a series of research of OER catalytic performance, OER process kinetics, and stability, the as-prepared Ni @ NiO/N–C nanowires (NW) (250 °C) with core-shell structure showed the most prominent activity. Compared with other derived mixed materials, the oxygen evolution overpotential was 390 mV at the current density of 10 mA cm −2 , and the Tafel slope was 100 mV dec −1 . Moreover, the material showed excellent stability without significant decrease of activity after a long time of testing. The detail study regarding the formation and evolution of Ni/NiO NWs is of considerable value and may offer prospects for developing highly active electrocatalysts in electrochemical energy devices.
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RSC Advances
·
2019
·Vol. 9
·期 70
·40845-40854
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IF 3.049
Saira Shams,Waqas Ahmad,Amjad Hussain Memon,Yun Wei,Qipeng Yuan,Hao Liang
Herein, we report an effectual method for designing a novel form of nanozyme laccase mimic namely Cu/H3BTC, using copper ions and 1,3,5-benzene tricarboxylic acid (1,3,5-H3BTC). This Cu-based metal–organic framework (MOF) was synthesized through a simple procedure of mixing of two usual reagents at room temperature. Amido Black 10B (AB-10B) was chosen as a model dye for degradation consequences. Results showed that Cu/H3BTC MOF revealed significantly higher catalytic efficacy under certain conditions like high pH, extreme temperature and high salt conditions and it has long-term storage stability, which can lead to a significant decline in catalytic activity of laccase. In addition, the degradation of AB-10B was up to 60% after ten cycles, showing good recyclability of Cu/H3BTC MOF. The UV-visible spectral changes clearly showed that Cu/H3BTC MOF is an effective laccase mimic for the degradation of azo dye AB-10B, which was degraded more easily within the time duration of 60 min. The Cu/H3BTC MOF also possessed fundamental activities like laccase with regard to oxidation of the phenolic compounds. Moreover, a technique for the quantitative detection of epinephrine by Cu/H3BTC MOF was established. These findings help to understand the laccase-like reactivity and provide a basis for the future design and application of metal-based catalysts.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2019
·Vol. 166
·期 16
·B1681
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IF 3.12
Dandan Song,Lili Wang,Yuning Qu,Bing Wang,Yanting Li,Xueli Miao,Yuying Yang,Cunpeng Duan
Constructing a reasonable electrode material structure is significant for the sensitivity and selectivity of glucose detection. Herein, in this paper, the three-dimensional (3D) hierarchically layered double hydroxides (CC@CCH MOF LDH) is prepared by using carbon cloth (CC) as the conductive base, cobalt carbonate nanorod (CCH) as the guiding template and metal organic framework (MOF) as the sacrifice template. This unique 3D hierarchical structure facilitates the rapid transfer of ions and the reversible redox reaction. Moreover, the electrochemical tests confirm that the material has excellent electrocatalytic oxidation activity in alkaline solution. The amperometric detection results reveal that CC@CCH MOF LDH electrode material possesses better selectivity, higher sensitivity (4310 μA·mM−1·cm−2), fast amperometric response (<6 s), wide linear range (0.001-2 mM) and low detection limit (110 nM) under the optimal conditions, which is expected to be a high performance enzyme-free glucose sensor.
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ACS Sustainable Chemistry & Engineering
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2019
·
IF 6.97
Chunyu Li,Chao Wu,Baoquan Zhang
Blending porous inorganic fillers into polymers to fabricate mixed matrix membranes (MMMs) is an efficient method to acquire good-quality membranes for CO2 separation and purification. The poor interface coupling between bulky filling particles and polymer phase in MMMs results in reduced mechanical strengths with low separation performances. The novel two-dimensional (2D) and ultrathin α-Ni(im)2 nanosheets with high aspect ratios are herein synthesized and blended with Pebax MH 1657 to prepare MMMs. The larger contacting area and strong hydrogen bonding between α-Ni(im)2 nanosheets and Pebax improve their compatibility to form defect-free MMMs. The ultrathin α-Ni(im)2 nanosheets in MMMs can effectively enhance CO2/CH4 selectivity based on molecular sieving. With the addition of 2 wt % of α-Ni(im)2 nanosheets, the as-prepared MMMs exhibit CO2/CH4 selectivity up to 33.4 with a permeability of 100.6 Barrer. Compared with pure Pebax membrane, the separation selectivity shows a 72% increase with no significant change in CO2 permeability.
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Energy Technology
·
2019
·Vol. 7
·期 6
·1900018
·
IF 3.163
Jianhua Yu,Xiaolei Gao,Zhenxing Cui,Yu Jiao,Qian Zhang,Hongzhou Dong,Liyan Yu,Lifeng Dong
Recently, binary transition metal oxides, phosphates, and sulfides have attracted wide attention due to their potential applications in supercapacitors. The emergence of metal-organic frameworks (MOFs) provides new opportunities for the synthesis and investigation of porous binary metal compounds with similar microstructures. Herein, binary metal oxide (NiCo-O) tubular structures are derived from NiCo-MOF-74 via a facile annealing process, and then phosphate (NiCo-P) and sulfide (NiCo-S) structures are obtained from NiCo-O by heat treatment and solvothermal process, respectively. Among the three derivatives, NiCo-S with nanosheet structures has the highest specific capacitance of 930.4 F g −1 at a current density of 1 A g −1 and an excellent rate capability with a retention of ≈80% at 10 A g −1 . The long-term cycling performance of NiCo-S is superior with 70.5% retention after 10 000 cycles. The hybrid supercapacitor device with NiCo-S and activated carbon as positive and negative electrodes delivers a high energy density of 22.6 W h kg −1 at a power density of 800 W kg −1 . The excellent performance of NiCo-S can be attributed to its nanosheet structure, which increases the specific surface area and electroactive sites.
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CHEMOSPHERE
·
2019
·
IF 5.108
Zifen Luo,Hongyi Chen,Shichuan Wu,Cao Yang,Jianhua Cheng
Aluminum-based metal-organic framework/sodium alginate-chitosan (Al-MOF/SA-CS) composite beads were synthesized and employed as an adsorbent for the removal of bisphenol A (BPA). Several methods, including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), nitrogen adsorption-desorption isotherms and X-ray photoelectron spectroscopy (XPS), were used to characterize the prepared adsorbents. Results demonstrated that the introduction of CS could change the porosity of the beads and the obtained Al-MOF/SA-CS composite beads possessed higher surface area and total pore volume comparing with the beads without CS. Batch experiments were carried out to explore the adsorption performance and the results displayed that the enhanced adsorption capacity was achieved by Al-MOF/SA-CS beads compared to the Al-MOF/SA ones. It is also found from the fitting results that the adsorption process fitted well with the pseudo-second-order kinetics model and followed the Freundlich isotherm model. Importantly, the composite beads could be easily recycled and regenerated by methanol and the adsorption efficiency still maintained as high as 96% even after five cycles. Furthermore, it can be inferred from the experimental results that the π-π stacking, hydrogen bonding and cation-π interaction could be the primary adsorption mechanisms. Considering the high adsorption properties, good water stability, especially easy separation, and excellent recyclability , Al-MOF/SA-CS composite beads could be a promising adsorbent for the removal of BPA from contaminated water .
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Suhang Xun,Yan Xu,Jingjing He,Deli Jiang,Rong Yang,Di Li,Min Chen
Developing highly efficient and earth-abundant electrocatalysts for water oxidation is highly desirable for sustainable energy conversion applications. In this work, we designed and constructed a novel integrated ternary hybrid composed of CoO/Co 3 O 4 (CoO x ) nanoparticles supported on CoMoO 4 nanorods (CoO x /CoMoO 4 ) through a hydrothermal treatment of ZIF-67/CoMoO 4 followed by a thermal annealing. Benefiting from the enlarged surface areas, more active sites and fast charge transfer kinetics resulted from the interface between CoO x and CMO, the CoO x /CMO electrocatalyst manifests the excellent oxygen evolution reaction (OER) catalytic performance with a low overpotential of 253 mV at the current density of 10 mA cm −2 and high long-term durability, which is superior to those of most previously reported Co- or Mo-based oxides electrocatalysts. This work not only provides a highly efficient catalyst for OER but also sheds light on the fabrication of ternary Co-based hybrid electrocatalyst by using ZIF-67 as a precursor.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 33
·期 5
·e4865
·
IF 3.259
Chao Duan,Chaoran Liu,Xin Meng,Wanli Lu,Yonghao Ni
In this work, we prepared high-performance and recyclable nanocatalysts that consist of small and well-dispersed silver nanoparticles (Ag NPs) immobilized onto Cu- based metal–organic framework (MOF-199 s) supported by carboxymethylated cellulose fibers (CCFs). The as-prepared green nanohybrid catalysts, namely Ag NPs@ MOF-199 s/CCFs, were characterized using SEM, TEM, XRD and FT-IR techniques. The catalytic performances showed that Ag NPs@ MOF-199 s/CCFs catalysts exhibited a very high catalytic efficiency towards the reduction of 4-nitrophenol to 4-aminophenol. The enhanced catalytic performances are attributed to the improved dispersity, small particles of Ag NPs stabilized by the MOF-199 s, and the porous catalyst structures. The introduction of cellulose fiber further facilitates the reuse and sustainability of the nanohybrid catalysts, showing a stable and high reusability (more than 91% of catalytic activity) even after five runs.
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BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Li Dai,Yueyuan Li,Yaoguang Wang,Xiliang Luo,Dong Wei,Rui Feng,Tao Yan,Xiang Ren,Bin Du,Qin Wei
A sandwich-type electrochemical immunosensor for prostate-specific antigen (PSA) detection was constructed. In this sensing platform, palladium nanoparticles (Pd NPs) loaded electroactive amino-zeolitic imidazolate framework-67 (Pd/NH 2 -ZIF-67) nanocomposite is utilized as a novel redox mediator . Pd NPs, as the labeling signal molecule, owns good biocompatibility and excellent catalytic performance. Meanwhile, the electroactive ZIF-67 with lamellar structures serves not only as a carrier of Pd NPs but also as a synergistic catalyst of palladium to decompose H 2 O 2 . Amperometric method is used to determine the current signal generated on the electrode surface , which is conducive to achieve the quantitative determination of PSA. Under optimum conditions, the proposed immunosensor shows a wide detection range from 100 fg mL –1 to 50 ng mL –1 with a low detection limit of 0.03 pg mL –1 , featuring favorable selectivity, repeatability and stability. This proposed immunosensor is expected to be a powerful tool for realizing quantitative detection of PSA and other biomarkers in actural sample analysis.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Wen Zhang,An Bu,Qingyuan Ji,Luofu Min,Song Zhao,Yuxin Wang,Jing Chen
We report a class of pKa-directed, precise incorporation of phosphonate ligands into a zirconium-based metal–organic framework (Zr-MOF), MOF-808, via ligand exchange. By replacing of formate ligands with methylphosphonic acid (MPA), ethanephosphonic acid (EPA), and vinylphosphonic acid (VPA), whose pKa values are slightly higher than that of the benzenetricarboxylic acid (BTC) linker in MOF-808, daughter MOFs can be synthesized without controlling the stoichiometric amounts of added MPA. The methylphosphonate MOFs (808-MPAs) demonstrate high porosities, with only small changes in the pore diameter and specific surface area when compared with the parent MOF-808. PXRD patterns and structure refinements indicate the expansion of the lattice for all MOFs after decorating with methylphosphonate ligands. The XPS spectra reveal a charge redistribution of the Zr6 node after ligand exchange. FTIR and 31P MAS NMR spectra, combined with DFT calculation, suggest that the methylphosphonate ligand is connected to the Zr6 node as CH3P(O)(OZr)(OH) species with an accessible acidic P–OH group. Besides, 808-MPAs demonstrate excellent chemical stability in concentrated HCl, concentrated HNO3, hot water, and 0.2 mol/L trifluoroacetic acid solutions. Impressively, 808-MPAs show ultrafast adsorption performance for uranyl ions using the ion-exchange property of P–OH sites in their cavity environment, with an equilibrium time of 10 min, much quicker than the previous adsorbents. The present study demonstrates a series of important proof-of-concept examples of the pKa-directed Zr-MOFs with tunable phosphonate-terminated ligands, which can extend to other phosphonate-functionalized Zr-based framework platforms in the near future.
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