Materials Today Energy
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2021
·
IF 7.311
Changchang Dong,Feng Wei,Jiadong Li,Qiao Lu,Xiaojun Han
The electrochemical ammonia synthesis under ambient conditions is a promising process instead of the energy-intensity Haber-Bosch process with the release of huge greenhouse gases. But it still faces sluggish catalytic kinetics owing to difficulty of N 2 adsorption and N≡N bond cleavage. Herein, the uniform ZrO 2 @C with octahedral structure is synthesized via two-step annealing treatment of UiO-66. The formation of ZrO 2 originates from Zr and O elements in UiO-66, and the grain size is confined by the produced carbon matrix from the carbonization of the organic ligand, resulting in more exposure of the active sites. ZrO 2 @C obtained at 650 °C presents excellent electrocatalytic nitrogen reduction performance with a NH 3 yield rate of 6.72 μg h −1 mg cat. −1 and a Faradaic efficiency of 2.68% at −0.6 V versus reversible hydrogen electrode (RHE). This work provides a strategy to design metal oxide@C from metal-organic frameworks for nitrogen fixation.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Peng Zhang,Yueyang Xu,Konglu Guo,Yan Yin,Jilong Wang,Yongping Zeng
Adsorption desulfurization represents an alternative technology for the effective removal of thiophenic compounds from fuels. Metal−organic frameworks have been the ideal candidates for the adsorptive desulfurization of fuel due to the high surface areas. Pristine UiO-66 is thought to be appropriate for the removal of small thiophenic compounds. This work developed a new type of hierarchical-pore (micro and mesopores) UiO-66 with a higher specific surface area and porosity for the removal of larger adsorbates using MOF-5 as the template. To enhance adsorption desulfurization performance, the Ag + -exchanged hierarchical-pore UiO-66 (HP-UiO-66-SO 3 Ag) with π-complexation was synthesized by the ion-exchange method. The HP-UiO-66-SO 3 Ag samples were characterized by FTIR, XRD, SEM, TEM, and N 2 adsorption–desorption isotherms. Compared with the original UiO-66, the HP-UiO-66-SO 3 Ag has a higher specific surface area, pore volume, and pore size. The static adsorption experiments showed that HP-UiO-66-SO 3 Ag had a high adsorption capacity for thiophene and benzothiophene . Moreover, the HP-UiO-66-SO 3 Ag sample still exhibits high adsorptive performance in the presence of toluene. The regeneration results show that about 90% of the initial adsorption capacity of HP-UiO-66-SO 3 Ag can be regenerated after four cycles.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2021
·Vol. 168
·期 5
·057526
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IF 4.316
Mengmeng Xu,Yuhua Dong,Jianbin Zheng
In this article, a core–shell CuPd@UiO-66-NH2 composite material was synthesized by a double-solvent reduction method, and an N2H4 electrochemical sensor based on CuPd@UiO-66-NH2 was constructed. The relationship between the morphology, type, composition, size of the sensor interface composite material and its electrocatalytic performance and sensor response performance was studied, and a new method for detecting N2H4 was established. The surface properties and composition of the materials were studied by transmission electron microscope(TEM),energy dispersive X-ray spectroscopy(EDX) and X-ray diffraction spectroscopy(XRD). The results showed that the synthesized CuPd@UiO-66-NH2 has a regular 3D structure, particle dispersion, and uniform particle size, the particle size is about 90 nm. Electrochemical performance studies showed the sensor is made into detecting N2H4 in a linear range of 0.25 μM ∼ 1.39 mM, with a sensitivity of 386.7 μA·mM−1·cm−2, and a detection limit of 0.08 μM(S/N = 3). Compared with other electrochemical sensors based on metal nanoparticles to detect N2H4, the new sensor exhibited a wider linear range; and its sensitivity was 3 times of that obtained by the Cu-BTC/OMC/GCE. So, the sensor can be used as a potential sensing material to detect hydrazine.
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CHEMICAL ENGINEERING JOURNAL
·
2020
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IF 10.652
Qiuzheng Du,Pu Wu,Yiyang Sun,Jingyi Zhang,Hua He
A simple and recyclable imprinted catalytic composite (ZnO@NH 2 -UiO-66, ZUM) was synthesized by postsynthetic modification method with tetracycline (TC) as molecular template. A series of ZUM-n composites with different NH 2 -UiO-66 dopants from 0.1 to 0.7 g had been prepared and compared. The characterization results showed that ZUM-1 possessed the advantages of uniform size, high surface area and wide absorption spectrum. Further research results indicated that ZUM-1 composite has the ability of selective adsorption and the higher photocatalytic degradation efficiency to TC without secondary pollution. Under visible light irradiation, the ZUM-1 could degrade 61.9% of TC within 30 min, which may relate to the inhibition effect of composite materials on electron-hole recombination. The degradation selectivity of ZUM-1 was investigated by comparing the degradation efficiency of TC, tetracycline hydrochloride and ciprofloxacin. The high degradation efficiency and selectivity of ZUM-1 were also confirmed in real samples. The stability experiments showed that the ZUM-1 possessed excellent recyclability and stability in the photocatalytic degradation process, and the recycled process was environmentally friendly. The mechanism of TC photodegradation by ZUM-1 was investigated by UV–vis spectra, photoelectrochemical and radical scavenger experiment. And the possible degradation products were analyzed by HPLC-MS. All in all, this method provided a simple and promising perspective for preparing visible-light-responsive molecular imprinting composites with high specificity and photocatalytic activity.
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Surfaces and Interfaces
·
2023
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IF 6.2
Ning Liu,Bin Hu,Kexin Tang,Tingyu Xia,Fei Li,Guixiang Quan,Xiaodong Zhang,Liang Tang
In the pursuit of restoring and preserving our planet's natural equilibrium, the development of photocatalytic agents with exceptional aptitude for CO 2 reduction stands as an essential undertaking, which would be greatly facilitated with the energy regeneration and environmental purification. Herein, a composite material HTiNbO 5 /UiO-66 (UTi) was amalgamated by a one-step solvothermal method. The resultant composite material exhibited remarkable improvement on the photoreduction efficiency of CO 2 reduction compared with pristine UiO-66 and HTiNbO 5 . Impressively, UTi composite with 3 wt% HTiNbO 5 (UTi-3) illustrated the highest CO 2 photoreducation activity to CO, the CO yield of UTi-3 was about 9.3 and 11.2 times higher than that of pure UiO-66 and HTiNbO 5 , respectively. The significantly improved photocatalytic performance could be ascribed to the enlargement of specific surface area, the improved visible-light absorption range and shrinkage of the energy band gap, which can increase photogenerated electron production to promote the reduction reaction of CO 2 to CO. The insights obtained from this study can guide the application of semiconductor composites in the field of CO 2 photocatalytic reduction, so as to design high efficiency photocatalysts .
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CELLULOSE
·
2019
·Vol. 26
·期 5
·3387-3399
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IF 3.917
Zhang Chuanjie,Tian Jiaxin,Rao Weida,Guo Bin,Fan Lingling,Xu Weilin,Xu Jie
Metal-organic frameworks (MOFs) are recently attracting more and more interests as supercapacitor electrode materials. However, their low conductivity largely thwarts their capacitance performance. Herein, fabric electrodes for flexible supercapacitors were successfully fabricated by depositing polypyrrole (PPy) nanotubes and Zr-based MOF (UiO-66) particles on cotton fabrics. The PPy nanotubes could serve as conductive connectors to bridge the UIO-66 particles due to their superior conductivity with one-dimensional structure. The conductivity of the PPy@UIO-66@cotton fabric electrode was increased to 14.29 S cm −1 . A specific capacitance of 565 F g −1 at a current density of 0.8 mA cm −2 was obtained for the PPy@UIO-66@cotton fabric electrode. In addition, the proposed fabric electrode exhibited good cycling stability with capacitance retention of 90% after 500 charge–discharge cycles and excellent rate capability. This study confirmed the combination of MOFs and PPy nanotubes has great application prospect in fabric-based flexible supercapacitors.
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Nanomaterials
·
2019
·Vol. 9
·期 9
·1283
·
IF 4.034
Hao Zhang,Xiaobo Shi,Jialiang Li,Parveen Kumar,Bo Liu
In this study, Zeolitic Imidazolate Framework-8 (ZIF-8)-loaded UiO-66-NH2was synthesized, characterized, and analyzed for its potential to efficiently remove dyes. The selective adsorption on ZIF-8-loaded UiO-66-NH2or its parent MOFs (UiO-66-NH2and ZIF-8) in the mixed dyes solution was explored, including anionic dye (methyl orange (MO)) and cationic dyes (methylene blue (MB) and rhodamine B (RhB)). ZIF-8-loaded UiO-66-NH2displayed much better selectivity to MB than its parent MOFs. Adsorption capacity of ZIF-8-loaded UiO-66-NH2(173 mg/g) toward MB was found to be 215% higher than UiO-66-NH2(55 mg/g). A kinetics study based on adsorption data demonstrated that the adsorption process most closely matched with the model of pseudo-second-order kinetic and Langmuir isotherm. The adsorption was an exothermic and spontaneous physical process as revealed by the values of thermodynamic parameters. Furthermore, reusability of ZIF-8-loaded UiO-66-NH2was investigated and revealed the significant regeneration efficiency in adsorption capacity for MB even after four adsorption cycles. Experimental results proved that the interaction between ZIF-8-loaded UiO-66-NH2and MB was mainly affected by the mechanism, for instance, electrostatic interaction as well as π–π stacking interactions.Keywords:ZIF-8;UiO-66-NH2composites;metal-organic frameworks;selective adsorption
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2014
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IF 2.063
Yan Cao,Yunxia Zhao,Zijian Lv,Fujiao Song,Qin Zhong
New composites of UiO-66 and graphene oxide (GO) were synthesized and tested as CO 2 adsorbents at room temperature. The materials and the parent composite components were characterized using X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), nitrogen adsorption–desorption isotherm analysis, scanning electron microscopy (SEM), and FT-IR spectroscopy. The CO 2 isotherms on the UiO-66/GO composites and the UiO-66 were measured by a static volumetric method separately. Experiments of multiple adsorption/desorption cycles were conducted to estimate reversibility of CO 2 on the UiO-66/GO. The results showed that the BET surface area of the composites was higher than that of the parent UiO-66, and the adsorption capacities of CO 2 on the composites were greatly higher than that on the UiO-66 sample. The composite UiO-66/GO-5 exhibited the maximum CO 2 uptake of 3.37 mmol/g at 298 K and 1 bar, which increased by 48% in comparison with that of the UiO-66, and was much higher than those of the conventional activated carbons and the zeolites. The CO 2 adsorption capacity was dependent on the BET surface area and the micropore volume of the composites. Finally, the adsorption/desorption cycle experiment revealed that the adsorption performance of UiO-66/GO-5 was fairly stable, without noticeable degradation in the adsorption capacity of CO 2 after 6 cycles. Therefore, this kind of composites has a potential application on CO 2 capture technologies to mitigate global warming.
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RSC Advances
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2015
·Vol. 5
·期 23
·17601-17605
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IF 3.84
Yueyue Tan,Wei Zhang,Yilong Gao,Jianxiang Wu,Bohejin Tang
Metal organic frameworks (MOFs), a kind of crystalline porous material, have attracted much attention due to their high surface area and controllable porous structure. In this paper, we present a new synthesis of Zr-based MOFs with high electrochemical performance by a facile synthetic method of changing the reaction temperature and stirring condition. By varying the reaction temperature, different particle sizes and degrees of crystallization can be obtained. This paper focuses on the electrochemical properties of Zr-based MOFs as electrode materials in supercapacitors. The maximum specific capacitance of Zr-MOF1 obtained at 50 °C can reach up to 1144 F g−1 at a scan rate of 5 mV s−1, which is far higher than Zr-MOF2 (811 F g−1), Zr-MOF3 (517 F g−1) and Zr-MOF4(207 F g−1). The results of electrochemical measurements show that the Zr-MOF1 we synthesized has excellent capacitance performance and good cycling stability over 2000 cycles, which makes it a promising supercapacitor electrode material.
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CRYSTAL GROWTH & DESIGN
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2017
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IF 4.055
Yitong Han,Min Liu,Keyan Li,Qiao Sun,Chunshan Song,Guoliang Zhang,Zongchao Zhang,Xinwen Guo
Controlled synthesis of metal–organic frameworks (MOFs) in nanometer scale is highly desired for the optimization of properties and the extending of applications. In this work, Cu2O was used as additive for the first time in the synthesis of zirconium-based MOF UiO-66. We found that the amount of Cu2O additive had an important impact on downsizing the crystal size of UiO-66. Cu2O additive plays a role of rate controller of crystal growth of UiO-66 crystals by their competitive coordination behavior with the linker H2BDC between the [Zr–O] clusters. This generates a depleted H2BDC concentration for the coordination with the [Zr–O] clusters for constructing the UiO-66 framework, which favors the production of small crystals. As a result, well-dispersed nanometer scale UiO-66 crystals with mean crystal size of 40 nm can be easily synthesized by the addition of Cu2O. The as-synthesized nanometer scale UiO-66 crystals have a pure crystal structure with high crystallinity and superior porosity.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Chenling Yao,Huan Zeng,Caiqin Wu,Di Wang,Wenbo Ma,Guilong Li,Jialing Zhou,Jian Wang
Converting the salinity gradient between seawater and river water into osmotic energy is one of the direct and effective ways to alleviate the energy crisis. High selectivity and permeability are two contradictory aspects in the design of composite membranes , and balancing the relationship between the two is the key to achieving efficient osmotic energy harvesting . Herein, a series of heterogeneous membranes consisting of UiO-66-NH 2 intercalated with poly (sodium 4-styrenesulfonate) (PSS) and anodized aluminum oxide (AAO) were designed to enhance the osmosis power generation capacity. The asymmetry of pore size, surface charge, and wettability of the composite membrane makes it behavior like a diodes-like ionic current rectification (ICR). The addition of PSS changes the ion selectivity and permeability of the composite membrane, thus enhancing the energy harvesting performance. The maximum power density of 6.32 W/m 2 is obtained under a 50-fold salinity gradient, which is 4.94 times that of the original composite membrane. This study provides a reasonable preparation strategy for functionalized MOF-based composite membranes for ion transport and efficient osmotic energy conversion.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2024
·
IF 3.9
Jingwei Yuan,Wanyin Xu,Yirong Wang,Shao Wang,Ronghui Hao,Yubing Dong,Qianqian Li,Yufeng Zhao
Metal-organic frameworks (MOFs), characterized with highly ordered porous structures and relatively high surface area, exhibit significant application potential in the field of electrochemistry catalysis. In this study, we successfully prepared UiO-66(Ce) particles with uniform nanocube morphology and the size distribution ranging from 90 to 156 nm. Both morphology and size can be precisely tuned by directly adjusting detailed synthesis parameters, including solvent concentration and reaction time. Moreover, the crystal growth mechanism of UiO-66(Ce) was comprehensively investigated through the microstructure characterization. Such uniform particles demonstrated a desirable electrocatalytic performance with hydrogen evolution reaction (HER) overpotential of 118.6 mV (at 10 mA cm −2 ) in alkaline electrolyte (1 M KOH). This study not only introduces a novel approach for the morphological manipulation of UiO-66(Ce), but also presents new material candidates for the advancement of high-performance electrochemical energy conversion systems.
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危险品化学品经营许可证（带存储）