INORGANIC CHEMISTRY COMMUNICATIONS
·
2019
·
IF 1.795
Tursunjan Aydan,Chao Yang,Yang Xu,Tongtong Yuan,Min Zhang,Hui Li,Xueming Liu,Xintai Su,Jide Wang
A Hybrid magnetic composite material Fe 3 O 4 @Cu x O y /C (where, x = 1–2; y = 0–1) was prepared via pyrolysis of FeOOH decorated Cu 3 (BTC) 2 (where, BTC = 1, 3, 5-benzenetricarboxylic acid) as a precursor. The obtained products was successfully applied to reduction reaction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) as a catalyst. Compared with other reported materials, Fe 3 O 4 @Cu x O y /C exhibits high catalytic activity with excellent recyclability.
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Chang Liu,Peng Wang,Xueke Liu,Xiaotong Yi,Zhiqiang Zhou,Donghui Liu
Multifunctional material for simultaneous pollutants removal and nutrient release is a novel, economical, and sustainable strategy to reuse agricultural wastewater and improve crop growth. Herein, we synthesized a multifunctional porous carbon by using β-cyclodextrin MOF (β-CD MOF) both as precursor and potassium source. The obtained carbon material (β-CD MOF-NPC) was equipped with microporous structure, large surface areas, and rich potassium element content, as determined by comprehensive characterization results. The batch adsorption experiments indicated β-CD MOF-NPC possessed efficient adsorptive removal ability of four amide herbicides from water, which might be through π–π interaction, hydrogen bonding, and electrostatic interaction. Besides, the β-CD MOF-NPC could effectively contribute to the growth of rice seedlings cultured in herbicide-contaminated wastewater by simultaneous adsorption of herbicides and release of potassium ions in the pot experiments. This study indicated β-CD MOF-NPC integrated the function of adsorbent and fertilizer, which is a promising material for sustainable and economical agriculture.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Cheng Cheng,Jiangtao Xu,Wei Gao,Shouxiang Jiang,Ronghui Guo
Metal-organic frameworks (MOFs) show promise and potential in energy storage but have limited applications due to their poor conductivity. In this work, a flexible fabric electrode is constructed with a sphere-flake-sphere structure formed by a nick-metal-framework (Ni-MOF) and reduced graphene oxide (RGO). The sphere-flake-sphere structure improves the conductivity and enhances the electrochemical performance of flexible RGO/Ni-MOF/metallic fabric electrodes (RNMEs). The areal capacitance of the RNME samples can reach 260 mF/cm 2 at a current density of 4 mA/cm 2 . The areal capacitance of RNME samples shows a good cycle stability after undergoing 2000 charging/discharging cycles. The all-solid-state asymmetric fabric supercapacitor (AAFSC) based on this hybrid and PPy fabric electrode shows excellent electrochemical energy-storage performance, with an areal capacitance of 95 mF/cm 2 , a power density of 3.07 mW/cm 2 , and an energy density of 7.72 μWh/cm 2 . The areal capacitance of AAFSC can keep over 70% of original areal capacitance after 1500 charging/discharging cycles. This flexible AAFSC shows a promise and potential for wearable textile electronics.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Mingyan Chen,Jie Chen,Yucheng Liu,Jie Liu,Lingli Li,Bing Yang,Lili Ma
A new type of metal organic framework GO/Ni-MOF-199 was synthesized using the solvothermal method in combination with different amounts of graphene oxide (0%, 0.5%, 1.75% and 5%) in order to remove thiophene from model oil. The adsorption desulfurization performance was tested by removing thiophene from the n-octane/thiophene model oil. The thermal stability of composites is improved by modification. Adsorption capacity of MOF-199 was enhanced by doping Ni 2+ and graphene oxide (GO) with appropriate content. Bimetallic ions combine with the oxygen-containing function of GO to form a stronger synergistic effect. The synthesized samples are characterized using XRD , SEM, FTIR, BET, and TGA methods. By using the appropriate characterization methods, it is shown that an excessive GO content will damage the structures of the composites. The investigation’s results demonstrated that the maximum adsorption capacity of 1.75% GO/Ni-MOF-199 reached 50.38 mgS/g MOF at 35 ℃, and a v (oil) /m (absorbent) ratio of 150 ml/g occurred after 3.5 h of adsorption. Furthermore, the 1.75% GO/Ni-MOF-199 composites could be reused at least four times. The pseudo-second-order dynamic model and Langmuir model are more suitable to represent how the GO/Ni-MOF-199 materials adsorb thiophene from the model oil.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Ji Ying Long,Zhi Shuo Yan,Yun Gong,Jian Hua Lin
Based on a meta-organic framework (MOF) formulated as [Co 4 (phen) 4 Cl 8 ] (phen = 1, 10-phenanthroline) as precursor, Cl/O doped C/CoO material (C/CoO-200) was synthesized by a one-step calcining method at a low temperature of 200 °C. In C/CoO-200, CoO nanoparticles with an average size of 25 nm were linked by carbon matrix into particles with the diameter of 200 nm ∼ 1 μm. The sample possessed a very low atomic percentage of CoO (CoO: 1.9%; C: 86.8%) due to the large amount of carbon from the organic ligand, phen in the precursor. However, it still exhibited a large specific capacitance of 1052 F g −1 at 0.5 A g −1 in 2 M KOH electrolyte with a 79.6% capacitance retention at 10 A g −1 . After successive etched in acid, Cl/O doped carbon nanoparticles were obtained. C-300 was composed by individual nanoparticles with size of 100–500 nm, it showed a specific capacitance of 207 and 164 F g −1 in 2 M KOH at a current density of 0.5 and 1 A g −1 , respectively, which was comparable to the commercial activated carbon (AC) (199 and 179 F g −1 for AC at 0.5 and 1 A g −1 , respectively). An asymmetric supercapacitor based on the positive electrode of C/CoO-200 and the negative electrode of C-300 exhibited a stable performance with a 61% retention of specific capacitance after 10,000 charging-discharging cycles at 1.5 A g −1 .
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CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Chao Xia,Caiyan Yu,Mengmeng Cao,Jinfeng Xia,Danyu Jiang,Guohong Zhou,Dafeng Zhang,Huili Li
In this work, a new Eu and Tb co-doped luminescent compound based on MOF-5, [Zn 4 O(BDC) 3 ], (named as compound 1 ) was successfully synthesized. The structure and morphology characterizations demonstrate that the initial framework of MOF-5 is retained well after co-doping Eu and Tb. The systematic investigations of photoluminescence behaviors reveal that the heat-treated compound 1 (called as compound 1a ) can be utilized as a multi-channel readout luminescent thermometer in emission intensity ratio, decay time ratio, and luminescence color. It simultaneously exhibits the excellent repetitiveness and reversibility under high temperature region from 303 to 473 K. The relative sensitivity of 1.8%/K at 473 K is much higher than the best one of 1.19%/K previously reported for the mixed-lanthanide MOF Tb 0.8 Eu 0.2 BPDA. Until now, such a ratiometric luminescent thermometer with a high sensitivity at the temperature as high as 473 K has been rarely explored.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 45
·期 3
·1263-1279
·
IF 1.674
Feng Sheng,Wang Runbai,Feng Shanshan,Zhang Zhihui,Mao Lebao
A novel ternary complex photocatalyst (UiO-66/ g -C 3 N 4 /Ag) was fabricated by chemical protonation coating and photodeposition and its physicochemical parameters, crystal morphology, and electrochemical properties characterized using a series of techniques. Proper addition of g -C 3 N 4 and Ag effectively enhanced the separation and mobility of photoinduced charge and improved the visible-light absorption and thereby the catalytic performance. Degradation experiments on target contaminants such as Rhodamine B (RhB) dye and 2,4-dichlorophenoxyacetic acid (2,4- d ) showed that the photocatalytic ability of UiO-66/ g -C 3 N 4 /Ag(15) was greatly increased compared with the parent material. Moreover, the composite could be regenerated by a simple ethanol washing process and exhibited stability and high reusability over six cycles. Finally, experiments on trapping of active species revealed that superoxide radicals (·O
− 2
), holes (h + ), and hydroxyl radicals (·OH) were primarily responsible for the photodegradation of RhB and 2,4- d .
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ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 29
·期 6
·1807418
·
IF 13.325
Changsheng Cao,Dong-Dong Ma,Qiang Xu,Xin-Tao Wu,Qi-Long Zhu
Herein, the authors report, for the first time, the semisacrificial template growth of a self-supporting metal–organic framework (MOF) nanocomposite electrode composed of ultrasmall iron-rich Fe(Ni)-MOF cluster-decorated ultrathin Ni-rich Ni(Fe)-MOF nanosheets from the NiFe alloy foam, in which the Fe(Ni)-MOF clusters are uniform with a particle size of 2–5 nm, while the thickness of the Ni(Fe)-MOF nanosheets is only about 1.56 nm. When directly used as a self-supported working electrode for the oxygen evolution reaction (OER), it can afford an impressive electrocatalytic performance with required overpotentials of 227 and 253 mV to achieve current densities of 10 and 100 mA cm −2 , respectively, much outperforming the benchmark of RuO 2 and most state-of-the-art noble-metal-free catalysts. Characterizations demonstrated that the combination of the unique nanostructure of the catalyst and the strong coupling effect between Ni and Fe active sites should be responsible for its excellent OER performance. Remarkably, when coupled with a Pt electrode in an overall water splitting system, they only needed 1.537 V to achieve a current density of 10 mA cm −2 . The facile and economical methodology represents a new way to design and prepare high-performance self-supporting MOF electrocatalysts for highly efficient electrochemical processes.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Houxiao Wu,Yongwei Chen,Daofei Lv,Renfeng Shi,Yang Chen,Zhong Li,Qibin Xia
The purification of ethylene (C 2 H 4 ) from the cracking gas ethane/ethylene mixture (1:15, v / v ) is a typical energy-intensive process in the chemical industry. As an alternative, adsorptive separation with much lower energy consumption and operational cost has attracted escalating attention. In this work, we reported an interesting C 2 H 6 -trapping adsorbent, In-soc-MOF-1, an indium-based metal-organic framework exhibiting the preferential adsorption of C 2 H 6 over C 2 H 4 . Single-component adsorption isotherms showed that the C 2 H 6 adsorption capacities were higher than those of C 2 H 4 under measured temperatures (288, 298 and 308 K). For example, the uptakes of C 2 H 6 and C 2 H 4 were 4.04 and 3.72 mmol/g at 298 K and 100 kPa, respectively. The calculated IAST selectivity of C 2 H 6 /C 2 H 4 (1:15) on In-soc-MOF-1 was in the range of 1.4–4.8. Moreover, the dynamic separation performance of In-soc-MOF-1 toward the C 2 H 6 /C 2 H 4 binary mixture was evaluated by the breakthrough experiments, the result of which suggests that In-soc-MOF-1 could achieve efficient separation by trapping the impurity C 2 H 6 molecules out of the C 2 H 6 /C 2 H 4 binary mixture. Notably, In-soc-MOF-1 not only showed good water and moisture stability but also exhibited excellent recyclability, where negligible decrease in C 2 H 6 adsorption capacity was observed during five cycles of adsorption-desorption tests. These properties suggest that In-soc-MOF-1, as a C 2 H 6 -trapping adsorbent, could be considered as a potential candidate in the practical application of separating the cracking gas mixture.
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CRYSTENGCOMM
·
2018
·Vol. 21
·期 1
·165-171
·
IF 3.304
Yongwei Chen,Houxiao Wu,Qiangqiang Xiao,Daofei Lv,Feier Li,Zhong Li,Qibin Xia
Given the fact that solvothermal synthesis is the most common synthetic method to obtain metal–organic frameworks (MOFs) on a gram scale, it still remains a great challenge to produce MOFs in a scalable and sustainable synthetic process. In this work, we develop a facile and rapid synthesis of copper-based MOF-505 by the exploitation of layered (Zn,Cu) hydroxy double salt as the intermediate for efficient MOF-505 crystallization at room temperature, in which [(Zn,Cu)(OH)NO3] is synthesized by reacting ZnO with Cu(NO3)2. Under an optimized reaction time of 25 min, MOF-505-25 exhibits a Brunauer–Emmett–Teller (BET) surface area of 1076 m2 g−1 and the pore size is narrowly distributed at 5.9 and 8.0 Å. With respect to CO2 adsorption and separation performance, MOF-505-25 shows a moderate CO2 uptake of 3.51 mmol g−1 at 298 K and 100 kPa and high CO2/CH4 and CO2/N2 adsorption selectivities of 7 and 29. Particularly, the formation of MOF-505 can be completed within a short reaction time (less than 30 min) whilst maintaining high quality. This facile and rapid room temperature synthetic procedure would pave the way for promoting the development of MOF materials large-scale production with minimizing the energy input.
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Advanced Energy Materials
·
2018
·Vol. 8
·期 19
·1800013
·
IF 21.875
Hui Zhang,Wenqi Zhao,Mingchu Zou,Yunsong Wang,Yijun Chen,Lu Xu,Huaisheng Wu,Anyuan Cao
Metal-organic frameworks (MOFs) hybridized with a conductive matrix could potentially serve as a sulfur host for lithium-sulfur (Li-S) battery electrodes; so far most of the previously studied hybrid structures are in the powder form or thin compact films. This study reports 3D porous MOF@carbon nanotube (CNT) networks by grafting MOFs with tailored particle size uniformly throughout a CNT sponge skeleton. Growing larger-size MOF particles to entrap the conductive CNT network yields a mutually embedded structure with high stability, and after sulfur encapsulation, it shows an initial discharge capacity of ≈1380 mA h g −1 (at 0.1 C) and excellent cycling stability with a very low fading rate. Furthermore, owing to the 3D porous network that is suitable for enhanced sulfur loading, a remarkable areal capacity of ≈11 mA h cm −2 (at 0.1 C) is obtained, which is much higher than other MOF-based hybrid electrodes. The mutually embedded MOF@CNTs with simultaneously high specific capacity, areal capacity, and cycling stability represent an advanced candidate for developing high-performance Li-S batteries and other energy storage systems.
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RSC Advances
·
2015
·Vol. 6
·期 5
·3671-3679
·
IF 3.84
Aoning Wang,Yingjie Zhou,Zhoulu Wang,Miao Chen,Luyi Sun,Xiang Liu
A UiO-66-type metal–organic framework (MOF) fabricated with titanium was successfully prepared via a facial modified post-grafting method. The as-prepared samples were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), ultraviolet-visible adsorption spectroscopy (UV-vis), and photoluminescence spectroscopy (PL) techniques. The introduction of titanium enhanced the optical properties of UiO-66 via the formation of oxo-bridged hetero-Zr–Ti clusters, but led to a sacrifice in crystallinity. The removal of methylene blue (MB) over these samples could be attributed to the dual function of the adsorption and photo-degradation mechanisms. The highest MB removal efficiency of 87.1% was achieved over UiO-66(1.25Ti) under simulated sun-light irradiation.
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