CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 6
·1058-1063
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IF 3.1
Wang Chenghui,Yu Zhichao,Bai Qinghong,Pan Dingwu,Prior Timothy J.,Tao Zhu,Redshaw Carl,Xiao Xin
T he binding behavior of cucurbit[8]uril(Q[8]) and p -hydroxybenzoic acid(p-HBA) has been investigated using 1 H NMR titration experiments, UV-Vis absorption, isothermal titration calorimetry(ITC), and X-ray crystallography. Results revealed that the Q[8] can accommodate two p -HBA molecules to form a 1:2 host-guest inclusion complex in solution, namely ( p -HBA) 2 @Q[8]. From a poorly scattering crystal, we were able to identify two symmetry unique Q[8] rings, but with different p -HBA fillings. The structure can be represented as Q[8]+1.5 p -HBA, which gives Q[8]@(p-HBA) 2 ·Q[8]@ p -HBA as the structural formula. This supramolecular structure was screened for its ability to capture iodine. The experimental results showed that the adsorption efficiency of the supramolecular organic framework material for iodine capture was 43.8%, with an equilibrium adsorption capacity of 223.3 mg/g.
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Solar RRL
·
2023
·Vol. 7
·期 12
·2300200
·
IF 7.9
Qi Ma,Junjie Lou,Xuediao Cai,Jiangshan Feng,Yang Cao,Zhigang Li,Shengzhong (Frank) Liu
The efficiency of perovskite solar cells (PSCs) has surpassed all other thin-film solar cells. It is well known that the mismatch between the perovskite film and electron transport layer is an important factor to damage the stability of PSCs. Herein, an effective modification strategy to improve stability by using FAI@ZIF-8 is demonstrated. It is found that the FAI@ZIF-8 modification reduces the trap-state density of the perovskite by slowly releasing FAI from the ZIF-8 pore. Besides, FAI@ZIF-8 improves energy-level alignment at TiO 2 /perovskite interface, which facilitates electron extraction at the interface. As a consequence, an optimal power conversion efficiency (PCE) of 23.52% is achieved for the FAI@ZIF-8-treated PSCs. After storing under 20–30% relative humidity and room temperature for 2000 h, the FAI@ZIF-8-treated device sustains 96% of its initial PCE; nevertheless, the control device maintains only 73% of its initial PCE under the same conditions. This strategy is helpful to guide the development of high-performance PSCs and promotes commercialization of perovskite materials.
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IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
·
2023
·
IF 5.6
Liangliang Cheng,Wanlu Zheng,Ya-Nan Zhang,Xuegang Li,Yong Zhao
A highly sensitive fiber-optic urea sensor was designed and experimentally demonstrated based on surface plasmon resonance (SPR) effect and metal-organic zeolite framework (MOF), [zeolite imidazole skeleton-8 (ZIF-8)]/urease modification. The SPR effect was excited by plating gold film on the thin core fiber (TCF) in multimode-thin core-multimode fiber (MMF) structure, which behaved high refractive index sensitivity. The ZIF-8/urease composite film was grown on the gold film by rapid aqueous phase synthesis method, in which the ZIF-8 could immobilize more urease and made urease and urea fully contact. Since the urease catalyzed urea hydrolysis would change the refractive index, the measurement of urea concentration was realized with high sensitivity and good selectivity. Experimental results showed that the urea measurement sensitivity of the proposed sensor could reach 6 nm/mM within the concentration range of 1–7 mM, which has great application potential in the field of human health monitoring.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 14
·4423-4428
·
IF 4
Xue-Ying Zhang,Xiao-Han Zhang,Bing-Ping Yang,Jiang-Gao Mao
A new alkaline earth–rare earth iodate, Ba2Ce(IO3)8(H2O), has been synthesised by a hydrothermal method and its structure has been determined by single-crystal X-ray diffraction. Ba2Ce(IO3)8(H2O) crystallises in the polar space group Pna21 (No. 33) with unit cell parameters of a = 15.5042(5) Å, b = 7.8841(3) Å, c = 19.5359(8) Å, V = 2388.00(15) Å3, and Z = 4. The structure of Ba2Ce(IO3)8(H2O) is characterised by zero-dimensional (0D) [Ce(IO3)8(H2O)]4− units separated by Ba2+ cations. Large crystals of Ba2Ce(IO3)8(H2O) with dimensions of a few millimetres have been grown. The UV-vis-NIR transmission spectroscopy measurements of the compound showed that it has a short wavelength absorption edge at 381 nm. Ba2Ce(IO3)8(H2O) exhibits a relatively weak second-harmonic-generation (SHG) response, about 0.2 times that of KDP, which is mainly due to the fact that the polarisation effects of the IO3 groups in the structure largely cancel each other out. The relationships between the structure and the physical properties of Ba2Ce(IO3)8(H2O) have also been calculated theoretically. Ba2Ce(IO3)8(H2O) has a band gap of 2.44 eV, which is determined by the Ce–O and I–O interactions and is larger than those of many simple metal iodates. The introduction of alkaline earth metals favours an increase in band gap. Our work shows that the SHG and birefringence properties are closely related to the arrangement of the functional groups in the compounds.
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Polymers
·
2018
·Vol. 11
·期 1
·27
·
IF 2.935
Yuxiao Feng,Le Zhong,Muhammad Bilal,Zhilei Tan,Ying Hou,Shiru Jia,Jiandong Cui
Zeolitic imidazole framework-8 (ZIF-8) with tunable pore sizes and high surface areas have recently emerged as a promising support for immobilizing enzymes. However, the instability in the aqueous acidic environment and difficulty of recovery has limited their practical applications in some cases. In this study, catalase/ZIF-8 composites with a protective nanocoating were prepared by the controlled self-assembly of silanes or coordination complexes (tannic acid (TA) and Fe3+). The properties of the catalase (CAT)/ZIF-8 composites with a protective nanocoating were also determined. The recovered activity of CAT/ZIF-8 and CAT/ZIF-8 with protective nanocoating was 70% and 65%, respectively. Compared with the conventional CAT/ZIF-8 composites, CAT/ZIF-8 with protective nanocoating exhibited excellent acid resistance. For example, after treatment for 60 min in phosphate buffer solution (pH 3.0), CAT/ZIF-8 composites only maintained 20% of their initial activity (about 12 U/mg). However, CAT/ZIF-8 with a protective nanocoating could still retain about 50% of its initial activity (about 10 U/mg). Meanwhile, the thermostability and storage stability of the CAT/ZIF-8 composites was enhanced significantly due to the presence of nanocoating compared with conventional CAT/ZIF-8. More importantly, the CAT/ZIF-8 with a protective nanocoating retained 40% of its initial activity after 7 cycles, whereas CAT/ZIF-8 only retained 8% of the initial activity. The approach in this study could be an efficient strategy to prepare enzyme/ZIF-8 composites with both high acid resistance and excellent recyclability.Keywords:enzyme/ZIF-8 nanocomposites;nanocoating;stability;acid resistance
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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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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Aisheng Huang,Bo Feng
Pristine graphene oxide (GO) sheets were pretreated with polyethyleneimine (PEI) to prepare PEI-modified GO (PEI-GO), which was further inserted with ZIF-8 crystals to form a novel PEI-GO@ZIF-8 nanocomposite for CO 2 capture. The good dispersion of PEI and interlayer growth of ZIF-8 within the GO sheets is helpful for high CO 2 adsorption. Therefore, the PEI-GO@ZIF-8 nanocomposite show high surface area and enhanced CO 2 adsorption capacity . The adsorption capacity of the PEI-GO@ZIF-8 nanocomposite was six times higher than that of the pristine GO and ZIF-8. The CO 2 /N 2 adsorption selectivity was significantly improved due to amine groups loading which provide more sites for CO 2 adsorption. The preferential adsorption of CO 2 over N 2 makes PEI-GO@ZIF-8 nanocomposite be a promising candidate in the field of CO 2 capture.
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RSC Advances
·
2018
·Vol. 8
·期 55
·31471-31477
·
IF 2.936
Yongyong Zhang,Ying Jia,Li'an Hou
Zeolitic imidazolate framework-8 (ZIF-8) was introduced on the surface of fibers of a non-woven fabric made of polyethylene terephthalate (PET). The phase structure, morphology, textural properties and chemical structure were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen (N2) adsorption analyzer and Fourier transform infrared spectroscopy (FTIR). The XRD, SEM and FTIR results indicated that ZIF-8 had been successfully coated on the PET fibers. N2 adsorption analyses suggested that addition of ZIF-8 significantly increased the specific surface and micropore volume of composites. The PM2.5 removal experiment showed the filtration efficiency of ZIF-8/PET was twice as high as that of pure PET. Meanwhile, ZIF-8/PET also displayed a low pressure drop and good recycling performance. This research provided a facile method to deposit active ZIF-8 onto polymers with low air resistance, and that ZIF-8/PET was a good candidate as an air filter for PM2.5 removal.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2017
·Vol. 21
·期 5
·1357-1364
·
IF 2.316
Chen Yalin,Mei Tao,Chen Yi,Wang Jianying,Li Jinhua,Wang Xianbao
The nanocomposite graphene oxide/8-aminoquinoline (GAQ) was prepared as modified electrode material for simultaneous determination of guanine and adenine. The prepared GAQ was characterized by SEM, TEM, FTIR, Raman, and UV-vis, which confirmed that the 8-aminoquinoline had been functionalized by covalent modification. The differential pulse voltammetry (DPV) proved the electrochemical properties of the GAQ, which exhibited good electrocatalytic activity and prominent synergistic effect for sensitive determination of guanine and adenine. The guanine and adenine both were detection by DPV showed good linearity with linear range covering 0.1–160 μM, and the detection limits (LOD) ( S/N = 3) both were estimated to be 0.033 μM for guanine and adenine, respectively.
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APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Xiancheng Ma,Liqing Li,Shaobin Wang,Mingming Lu,Hailong Li,Weiwu Ma,Tim C. Keener
A porous carbon (ZC) was prepared at 900 °C using zeolitic imidazolate framework-8 (ZIF-8) as a solid template for CO 2 adsorption. The ZC was further treated by ammonia functionalization to improve CO 2 uptake. The textural and surface characteristics of ZC samples were determined by X-ray diffraction (XRD), N 2 adsorption, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). It was revealed that ammonia treatment at 600 °C considerably enhanced the specific surface area and N-content of ZC. However, the pyrrolic-N group was decreased, yet the pyridinic-N group was increased with an increased temperature. The pyrrolic-N significantly enhanced CO 2 adsorption. The ammonia treatment, on the one hand, increases the alkalinity of ZC sample and the base–acid interaction between N-containing functional groups with CO 2 . On the other hand, the ammonia treatment increased pyrrolic-N group (NH) into carbon surface facilitating the hydrogen-bonding interactions between proton of pyrrolic-N and CO 2 molecules.
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DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 7
·2114-2121
·
IF 4.029
Gen Liu,Yan Xu,Yide Han,Junbiao Wu,Junli Xu,Hao Meng,Xia Zhang
A hierarchical zeolitic imidazolate framework-8 (micro/meso-ZIF-8) was fabricated by using cetyltrimethylammonium bromide as a structure-controlling agent and L-histidine as co-templates. Compared to the conventional microporous ZIF-8 (micro-ZIF-8), the hierarchical porous structure of micro/meso-ZIF-8 contains micropores and maximum mesopores of around 35.6 nm. The as-prepared hierarchical micro/meso-ZIF-8 featured a large surface area and superior spontaneous adsorption activity than micro-ZIF-8 towards lysozyme (LZM), bovine hemoglobin (BHb) and bovine serum albumin (BSA), and the adsorption capacity increased with the decreasing of the protein size due to the molecule cutoff effects. The maximum adsorption capacity of LZM on micro/meso-ZIF-8 was higher than most of the reported results under similar adsorption conditions. The analyses of adsorption kinetics and thermodynamics implied that the adsorption mechanism mainly involved physical adsorption. Moreover, the micro/meso-ZIF-8 showed good thermal stability against temperature and excellent regeneration ability in the recycling adsorption experiments. This work proposed herein opens a broad application prospect of hierarchical MOFs in biological molecule separation, immobilization and enrichment.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Xin Jiang,Hai-Yu Chen,Ling-Li Liu,Ling-Guang Qiu,Xia Jiang
Well dispersed Fe 3 O 4 embedded ZIF-8 nanocrystals were synthesized through a facile co-precipitation approach. Brunauer–Emmett–Teller (BET) and magnetic hysteresis loop analysis revealed that the hybrid nanoparticles with large surface areas exhibited good magnetic properties. The magnetic Fe 3 O 4 /ZIF-8 nanocomposites were used to remove hydroquinone (HQ) from aqueous solution. HQ adsorption kinetics followed the pseudo-second-order, and the equilibrations were established between 100 and 200 min. The adsorption isotherms of the nanocomposites could be described very well by the Langmuir equation with ultra-high maximum adsorption capacity of 2527 mg g −1 . Besides, the used Fe 3 O 4 /ZIF-8 could be conveniently regenerated by washing with methanol, and the regeneration efficiency could remain 90% after 3 cycles of regeneration. Along with the magnetic separation ability, the as-prepared Fe 3 O 4 /ZIF-8 nanocomposites might be promising candidate for efficient wastewater purification.
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