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Liqing Li, Xiancheng Ma, Ruofei Chen, Chunhao Wang, Mingming Lu
Nitrogen-doped porous carbon (ZC) is prepared by modification with ammonia for increasing the specific surface area and surface polarity after carbonization of zeolite imidazole framework-8 (ZIF-8). The structure and properties of these ZCs were characterized by Transmission electron microscopy, X-ray diffraction, N₂ sorption, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Through static adsorption tests of these carbons, the sample obtained at 600 °C was selected as an excellent adsorbent, which exhibited an excellent acetone capacity of 417...
January 19, 2018: Materials
Febrian Hillman, Jordan Brito, Hae-Kwon Jeong
The relatively slow and complex fabrication processes of polycrystalline metal-organic framework (MOF) membranes often times restrict their way to commercialization, despite their potential for molecular separation applications. Herein we report a rapid one-pot microwave synthesis of mixed linker hybrid zeolitic-imidazolate framework (ZIF) membranes consisting of 2-methylimidazolate (ZIF-8 linker) and benzimidazolate (ZIF-7 linker) linkers, termed ZIF-7-8 membranes. The fast-volumetric microwave heating in conjunction with unique counter diffusion of metal and linker solutions enabled unprecedented rapid synthesis of well-intergrown ZIF-7-8 membranes in ~ 90 s, the fastest MOF membrane preparation up to date...
January 19, 2018: ACS Applied Materials & Interfaces
Ravi C Dutta, Suresh K Bhatia
We investigate the structure of polyimide (PI) at the surface of a silicalite zeolite (MFI), as part of a model hybrid organic-inorganic mixed matrix membrane system, through equilibrium Molecular Dynamics simulations. Further, we report a comparison of the adsorption and transport characteristics of pure component CO2 and CH4 in PI, MFI and PI-MFI composite membranes. It is seen that incorporation of MFI zeolite into PI results in the formation of densified polymer layers (rigidified region) near the surface, having thickness around 1...
January 19, 2018: ACS Applied Materials & Interfaces
Jian Guan, Xiongwu Zhong, Xiang Chen, Xianjun Zhu, Panlong Li, Jianhua Wu, Yalin Lu, Yan Yu, Shangfeng Yang
Porous carbon and nanocarbons have been extensively applied as anode materials for high-energy density lithium-ion batteries (LIBs). However, as another representative nanocarbon, fullerenes, such as C60, have been scarcely utilized in LIBs because of their poor electrochemical reversibility. Herein, we designed a novel C60-embedded nitrogen-doped microporous carbon material (denoted as C60@N-MPC), which was derived from a zeolitic imidazolate framework-8 (ZIF-8) precursor, demonstrating its promising application as a superior anode material for LIB...
January 17, 2018: Nanoscale
T Pérez-Pérez, I Pereda-Reyes, E Pozzi, D Oliva-Merencio, M Zaiat
This paper shows the effect of organic shock loads (OSLs) on the anaerobic digestion (AD) of synthetic swine wastewater using an expanded granular sludge bed (EGSB) reactor modified with zeolite. Two reactors (R1 and R2), each with an effective volume of 3.04 L, were operated for 180 days at a controlled temperature of 30 °C and hydraulic retention time of 12 h. In the case of R2, 120 g of zeolite was added. The reactors were operated with an up-flow velocity of 6 m/h. The evolution of pH, total Kjeldahl nitrogen, chemical oxygen demand (COD) and volatile fatty acids (VFAs) was monitored during the AD process with OSL and increases in the organic loading rate (OLR)...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Mansi S Shah, Michael Tsapatsis, J Ilja Siepmann
No abstract text is available yet for this article.
January 17, 2018: Chemical Reviews
Meera Shete, Manjesh Kumar, Donghun Kim, Neel Rangnekar, Dandan Xu, Berna Topuz, Kumar Varoon Agrawal, Evguenia Karapetrova, Benjamin Stottrup, Shaeel Al-Thabaiti, Sulaiman Basahel, Katabathini Narasimharao, Jeffrey D Rimer, Michael Tsapatsis
No abstract text is available yet for this article.
January 22, 2018: Angewandte Chemie
Xiaomin Jia, Zhiyuan Yang, Yujun Wang, Ya Chen, Haitao Yuan, Heyin Chen, Xiaoxiang Xu, Xueqing Gao, Zuozhong Liang, Yu Sun, Jian-Rong Li, Haoquan Zheng, Rui Cao
Metal-organic frameworks (MOFs), a new type of porous crystalline materials, have great potential in biomedical applications, such as drug delivery. However, the efficacy of drug delivery is limited by the low loading of drugs. We have synthesized hollow mesoporous silica (HMS)@MOF capsule that can be used as pH-responsive drug delivery system for anti-cancer drug doxorubicin (DOX). DOX is loaded into the inner cavity of HMS.Then, zeolitic imidazolate framework-8 (ZIF-8) nanoparticles are coated on the outer surface of DOX loaded HMS...
January 16, 2018: ChemMedChem
Qinghua Zhang, Wenquan Zhang, Kangcai Wang, Juecheng Li, Zhien Lin, Siwei Song, Shiliang Huang, Yu Liu, Fude Nie
The experimental detection and synthesis of pentazole (HN5) and its anion (cyclo-N5-) have been actively pursued for the past hundred years in worldwide laboratories. In this study, we describe the synthesis of an aesthetical three-dimensional metal-pentazolate framework (denoted as MPF-1) consisting of sodium ions and cyclo-N5- anions, in which the isolated cyclo-N5- anions are preternaturally stabilized in this inorganic open-framework featuring two types of nanocages (Na20N60 and Na24N60) through strong metal coordination bonds...
January 16, 2018: Angewandte Chemie
Hong Ma, Yanyan Chen, Zhihong Wei, Sen Wang, Zhangfeng Qin, Mei Dong, Junfen Li, Jianguo Wang, Weibin Fan
Although dienes or trienes have been shown to be possible precursors for cyclization, direct cyclization of alkenes or alkoxides has not been systematically studied yet. Thus, the reaction mechanism of cyclization of linear alkenes was investigated here with H-ITQ-13 by density functional theory considering dispersive interactions (DFT-D). The similar free energy of different linear alkoxides of the same carbon number suggests that they can co-exist in the H-ITQ-13 intersection at 673.15 K during MTO process...
January 15, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Iris Elvira, Juan F Muñoz-Martínez, Álvaro Barroso, Cornelia Denz, José B Ramiro, Angel García-Cabañes, Fernando Agulló-López, Mercedes Carrascosa
Optical tools for manipulation and trapping of micro- and nano-objects are a fundamental issue for many applications in nano- and biotechnology. This work reports on the use of one such method, known as photovoltaic optoelectronics tweezers, to orientate and organize cylindrical microcrystals, specifically elongated zeolite L, on the surface of Fe-doped LiNbO3 crystal plates. Patterns of aligned zeolites have been achieved through the forces and torques generated by the bulk photovoltaic effect. The alignment patterns with zeolites parallel or perpendicular to the substrate surface are highly dependent on the features of light distribution and crystal configuration...
January 1, 2018: Optics Letters
D Cody, I Naydenova
The suitability of holographic structures fabricated in zeolite nanoparticle-polymer composite materials for gas sensing applications has been investigated. Theoretical modeling of the sensor response (i.e., change in hologram readout due to a change in refractive index modulation or thickness as a result of gas adsorption) of different sensor designs was carried out using the Raman-Nath theory and Kogelnik's coupled wave theory. The influence of a range of parameters on the sensitivity of holographically recorded surface and volume photonic structures has been studied, namely, hologram geometry, hologram thickness and spatial frequency, reconstruction wavelength, and zeolite nanoparticle refractive index...
January 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
V Gayathri Devi, Amit Sircar, Deepak Yadav, Jayraj Parmar
In the fusion fuel cycle, the accurate analysis and understanding of the chemical composition of any gas mixture is of great importance for the efficient design of a tritium extraction and purification system or any tritium handling system. Methods like laser Raman spectroscopy and gas chromatography with thermal conductivity detector have been considered for hydrogen isotopes analyses in fuel cycles. Gas chromatography with a cryogenic separation column has been used for the analysis of hydrogen isotopes gas mixtures in general due to its high reliability and ease of operation...
January 12, 2018: Journal of Separation Science
Hawraa Ayoub, Thibault Roques-Carmes, Olivier Potier, Bachar Koubaissy, Steve Pontvianne, Audrey Lenouvel, Cédric Guignard, Emmanuel Mousset, Hélène Poirot, Joumana Toufaily, Tayssir Hamieh
In this paper, for the first time, faujasite Y zeolite impregnated with iron (III) was employed as a catalyst to remove a real cocktail of micropollutants inside real water samples from the Meurthe river by the means of the heterogeneous photo-Fenton process. The catalyst was prepared by the wet impregnation method using iron (III) nitrate nonahydrate as iron precursor. First, an optimization of the process parameters was conducted using phenol as model macro-pollutant. The hydrogen peroxide concentration, the light wavelength (UV and visible) and intensity, the iron loading immobilized, as well as the pH of the solution were investigated...
January 11, 2018: Environmental Science and Pollution Research International
A Kharchenko, V Zholobenko, A Vicente, C Fernandez, H Vezin, V De Waele, S Mintova
The state of copper species stabilized in nanosized LTL zeolite subjected to various post-synthesis treatments was unveiled by a range of spectroscopic techniques. FTIR and UV-Vis studies demonstrated that the reduction process of copper in the LTL nanosized zeolite leads to the formation of different species including Cu2+, Cu+ and Cu nanoparticles (Cu NPs). The adsorption of probe molecules (NO and CO) was used to selectively monitor the copper species in the LTL nanosized zeolite upon oxidation and reduction post-synthesis treatments...
January 12, 2018: Physical Chemistry Chemical Physics: PCCP
Hui Fu, Hansong Qin, Yajun Wang, Yibin Liu, Chaohe Yang, Honghong Shan
Separation of branched chain hydrocarbons and straight chain hydrocarbons is very important in the isomerization process. Grand canonical ensemble Monte Carlo simulations were used to investigate the adsorption and separation of iso-pentane and n-pentane in four types of zeolites: MWW, BOG, MFI, and LTA. The computation of the pure components indicates that the adsorption capacity is affected by physical properties of zeolite, like pore size and structures, and isosteric heat. In BOG, MFI and LTA, the amount of adsorption of n-pentane is higher than iso-pentane, while the phenomenon is contrary in MWW...
December 6, 2017: Journal of Molecular Graphics & Modelling
Pei Nian, Yujia Li, Xiang Zhang, Yi Cao, Hai-Ou Liu, Xiongfu Zhang
Up to now, the fabrication of well-intergrown Co-based ZIFs membranes on porous tubular supports is still a major challenge. We report here a heteroepitaxial growth for preparing well-intergrown Co-based ZIFs (ZIF-67 and ZIF-9) tubular membranes with high performance and excellent thermal stability by employing a thin layer of ZnO nanorods acting as both nucleation centers and anchor sites for the growth of MOF membranes. The results show that well-intergrown Co-ZIF-67 and Co-ZIF-9 membranes, respectively, are successfully achieved on the ZnO nanorods modified porous ceramic tubes...
January 11, 2018: ACS Applied Materials & Interfaces
Zhengqi Wu, Chun Zhang, Li Peng, Xuerui Wang, Qingqing Kong, Xuehong Gu
The practical application of pure-silica MFI zeolite membranes for ethanol/water separation by pervaporation is limited by its poor stability. Herein, we present the Si-OH eliminated MFI membranes by a simple dopamine modification, which can effectively prevent the chemical reaction between Si-OH groups and components, endowing the long-term pervaporation stability.
January 10, 2018: ACS Applied Materials & Interfaces
Teng Liu, Fulin Yang, Gongzhen Cheng, Wei Luo
Searching for highly efficient bifunctional electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) using nonnoble metal-based catalysts is essential for the development of many energy conversion systems, including rechargeable fuel cells and metal-air batteries. Here, Co9-x Fex S8 /Co,Fe-N-C hybrids wrapped by reduced graphene oxide (rGO) (abbreviated as S-Co9-x Fex S8 @rGO) are synthesized through a semivulcanization and calcination method using graphene oxide (GO) wrapped bimetallic zeolite imidazolate framework (ZIF) Co,Fe-ZIF (CoFe-ZIF@GO) as precursors...
January 10, 2018: Small
Jiao-Feng Gu, Hang Zhou, Wen-Tao Yang, Pei-Qin Peng, Ping Zhang, Min Zeng, Bo-Han Liao
A pot experiment was carried out to investigate the remediation of paddy soils contaminated with both Cd and As. The effects of a soil additive (HZB: hydroxyapatite + zeolite + biochar) on the chemical speciation of Cd and As in the soil and on the accumulation and translocation of these two elements in rice plants were studied. The application of HZB decreased the concentration of acid-extractable Cd in the soil by 7.3-32.6% by promoting the transformation of soil Cd from soluble to insoluble species; as a result, the concentration of organically bound Cd in the soil increased by 6...
January 9, 2018: Environmental Science and Pollution Research International
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