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https://www.readbyqxmd.com/read/29664653/description-of-adsorption-in-liquid-chromatography-under-non-ideal-conditions
#1
Franziska Ortner, Chantal Ruppli, Marco Mazzotti
A thermodynamically consistent description of binary adsorption in reversed phase chromatography is presented, accounting for thermodynamic nonidealities in the liquid and the adsorbed phase. The investigated system involves the adsorbent Zorbax 300SB-C18, as well as phenetole (PNT) and 4-tert-butylphenol (TBP) as solutes and methanol and water as inert components forming the eluent. The description is based on adsorption isotherms which are a function of the liquid phase activities, in order to account for non-idealities in the liquid phase...
April 17, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29664603/dynamic-adsorption-of-co2-n2-on-cation-exchanged-chabazite-ssz-13-a-breakthrough-analysis
#2
Jamey Bower, Dushyant Barpaga, Sebastian Prodinger, Rajamani Krishna, Herbert Todd Schaef, B Peter McGrail, Miroslaw A Derewinski, Radha Kishan Motkuri
Alkali exchanged SSZ-13 adsorbents were investigated for their applicability in separating N2 from CO2 in flue gas streams using a dynamic breakthrough method. In contrast to IAST calculations based on equilibrium isotherms, K+ exchanged SSZ-13 was found to yield the best N2 productivity, comparable to Ni-MOF-74, under dynamic conditions where diffusion properties play a significant role. This was attributed to the selective, partial blockage of access to the chabazite cavities, enhancing the separation potential in a 15/85 CO2/N2 binary gas mixture...
April 17, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29557442/a-novel-polyhedron-based-metal-organic-framework-with-high-performance-for-gas-uptake-and-light-hydrocarbon-separation
#3
Qiushi Sun, Shuo Yao, Bing Liu, Xinyao Liu, Guanghua Li, Xiaoyang Liu, Yunling Liu
A novel polyhedron-based metal-organic framework [(CH3)2NH2]2[Zn3(TADIPA)2(DMF)2]·4DMF (JLU-Liu40), which possesses three types of cages with different shapes and sizes, has been successfully synthesized. The framework of JLU-Liu40 is constructed by two inorganic secondary building units (SBUs) of 4-connected square binuclear Zn-paddlewheel and 4-connected tetrahedron mononuclear Zn unit and one organic SBU, which has abundant Lewis basic sites (LBSs), and the framework can be simplified as a pair of 3-connected triangle geometries...
March 20, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29457858/postsynthetic-functionalization-of-three-dimensional-covalent-organic-framework-for-selective-extraction-of-lanthanide-ions
#4
Qianrong Fang, Qiuyu Lu, Yunchao Ma, Hui Li, Xinyu Guan, Yusran Yusran, Ming Xue, Yushan Yan, Shilun Qiu, Valentin Valtchev
Chemical Functionalization of covalent organic frameworks (COFs) is critical to tune their properties and broaden their potential applications. However, the introduction of functional groups especially in three-dimensional (3D) COFs still remains largely unexplored. Here we report a general strategy for generating a 3D carboxyl-functionalized COF through postsynthetic modification of a hydroxyl COF, and for the first time explore the carboxyl COF for selective extraction of lanthanide ions. The obtained COF shows high crystalllinity, good chemical stability, and large specific surface area...
February 19, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29436750/a-moisture-stable-3d-microporous-co-ii-mof-with-potential-for-highly-selective-co2-separation-under-ambient-conditions
#5
Santanu Chand, Arun Pal, Madhab C Das
Selective adsorption and separation of CO2 from flue gas and landfill gas mixtures have drawn great attention in industry. Porous MOF materials are promising alternatives to achieve such separations, however, the stability in presence of moisture must be taken into consideration. Here, we have constructed a microporous MOF {[Co(OBA)(L)0.5]·S}n (IITKGP-8), by employing a V-shaped organic linker with a azo functionalized N,N' spacer forming a 3D network with mab topology and 1D rhombus-shaped channels along crystallographic 'b' axis with void volume of 34...
February 13, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29344997/integration-of-open-metal-sites-and-lewis-basic-sites-for-construction-of-a-cu-mof-with-rare-chiral-oh-type-of-cage-for-high-performance-of-methane-purification
#6
Zhan Shi, Lingkun Meng, Ziyuan Niu, Chen Liang, XingLong Dong, Kang Liu, Guanghua Li, Chunguang Li, Yu Han, Shouhua Feng
A Cu MOF [Cu4(PMTD)2(H2O)3]·20H2O, 1, (Where PMTD is (1,4-phenylenebis(5-methyl-4H-1,2,4-triazole-3,4-diyl)bis(5-carboxylato-3,1-phenylene)bis(hydroperoxymethanide) with rare chiral Oh type of cage and dual functionalities of open metal sites and Lewis basic sites based on a designed U-shaped ligand was synthesized by hydrothermal method. It exhibits high-capacity of CO2, C2 and C3 hydrocarbon storage capacity under atmospheric pressure as well as high H2 (1.96% wt) adsorption capacity at 77K. Methane purification capacity was tested and verified step by step...
January 18, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29322772/stable-aluminum-metal-organic-frameworks-al-mofs-for-balanced-co-2-and-water-selectivity
#7
Haiwei Li, Xiao Feng, Dou Ma, Mengxi Zhang, Yuanyuan Zhang, Yi Liu, Jinwei Zhang, Bo Wang
Three new Al-MOFs in the formation of [Al4 (OH)2 (OCH3 )4 (OH-BDC)3 ]·xH2 O (BIT-72), [Al4 (OH)2 (OCH3 )4 (CH3 -BDC)3 ]·xH2 O (BIT-73) and {Al4 (OH)2 (OCH3 )4 [(CH3 )2 -BDC]3 }·xH2 O (BIT-74) have been synthesized by assembling Al3+ ion with terephthalic acid ions decorated with monohydroxyl, monomethyl or dimethyl groups, respectively. All of these three MOFs exhibit high stability in boiling water and acidic conditions. Among them, BIT-72 shows the highest surface area of 1618 m2 ·g-1 and IAST CO2 /N2 selectivity of 48, while BIT-73 and BIT-74 present moderate IAST CO2 /N2 selectivity and much lower H2 O capacity below P/P0 = 0...
January 31, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29232648/template-directed-fabrication-of-mil-101-cr-mesoporous-silica-composite-layer-packed-structure-and-enhanced-performance-for-co-2-capture
#8
Chong Chen, Nengjie Feng, Qirui Guo, Zhong Li, Xue Li, Jing Ding, Lei Wang, Hui Wan, Guofeng Guan
A novel hybrid material constituted of MIL-101(Cr) and mesoporous silica was successfully assembled through an in-situ hydrothermal method. The MCM-41 with well-ordered mesopores acted as the structure-directing agent, which regulated the growth of MIL-101(Cr) crystals along a certain direction and restricted the expansion of framework. Meanwhile, the hydroxyl groups existed in MCM-41 preferentially coordinated with the Cr3+ centers in MOF, followed by the layer-packed arrangement of MIL-101(Cr) nanocrystals on the surface of matrix...
March 1, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29220050/a-pair-of-polymorphous-metal-organic-frameworks-based-on-an-angular-diisophthalate-linker-synthesis-characterization-and-gas-adsorption-properties
#9
Fengli Chen, Dongjie Bai, Yao Wang, Minghui He, Xiaoxia Gao, Yabing He
The combination of an angular diisophthalate ligand, 5,5'-(naphthyl-2,7-yl)diisophthalate (H4 L), and copper ions under different solvothermal conditions afforded two polymorphous metal-organic frameworks (ZJNU-77 and ZJNU-78) with the same framework composition of [Cu2 (L)(H2 O)2 ], providing a platform to investigate the relationship between MOF polymorphism and gas adsorption properties. As determined by single-crystal X-ray diffraction, ZJNU-77 and ZJNU-78 exhibited three-dimensional networks crystallizing in different space groups...
January 15, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29215862/reticular-chemistry-and-the-discovery-of-a-new-family-of-rare-earth-4-8-connected-metal-organic-frameworks-with-csq-topology-based-on-re-4-%C3%AE-3-o-2-coo-8-clusters
#10
Giasemi K Angeli, Christina Sartsidou, Styliani Vlachaki, Ioannis Spanopoulos, Constantinos Tsangarakis, Andreas Kourtellaris, Emmanuel Klontzas, George E Froudakis, Anastasios Tasiopoulos, Pantelis N Trikalitis
In recent years, the design and discovery of new metal-organic framework (MOF) platforms with distinct structural features and tunable chemical composition has remarkably enhanced by applying reticular chemistry rules and the molecular building block (MBB) approach. We targeted the synthesis of new rare earth (RE)-MOF platforms based on a rectangular-shaped 4-c linker, acting as a rigid organic MBB. Accordingly, we designed and synthesized the organic ligand 1,2,4,5-tetrakis(4-carboxyphenyl)-3,6-dimethyl-benzene (H4 L), in which the two methyl groups attached to the central phenyl ring lock the four peripheral carboxyphenyl groups to an orthogonal/vertical position...
December 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29133792/controlled-synthesis-of-conjugated-polycarbazole-polymers-via-structure-tuning-for-gas-storage-and-separation-applications
#11
Guoyan Li, Long Qin, Chan Yao, Yanhong Xu
A series of conjugated microporous polymers (CMPs) based on 1,3,6,8-tetrabromocarbazole (N4 CMP-1-5) is synthesized via Suzuki cross-coupling or Sonogashira polycondensation. The porosity properties and surface area of these polymer networks can be finely tuned by using a linker with different geometries or strut length. These polymers show the Brunauer-Emmett-Tellerthe (BET) surface areas ranging from 592 to 1426 m2  g-1 . The dominant pore sizes of the polymers on the basis of the different linker are located between 0...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29124256/highly-selective-adsorption-of-p-xylene-over-other-c-8-aromatic-hydrocarbons-by-co-cuk-1-a-combined-experimental-and-theoretical-assessment
#12
Ji Woong Yoon, Ji Sun Lee, Graham W Piburn, Kyoung Ho Cho, Keonghee Jeon, Hyung-Kyu Lim, Hyungjun Kim, Chul-Ho Jun, Simon M Humphrey, Rajamani Krishna, Jong-San Chang
High quality crystalline Co-CUK-1 can be synthesized rapidly and efficiently by a microwave-assisted method. The resulting microporous coordination material is a highly effective adsorbent for the separation of xylene isomers and ethylbenzene, as demonstrated here through sorption isotherm analysis, Ideal Adsorbed Solution Theory (IAST) calculations, and grand canonical Monte Carlo (GCMC) simulations. Co-CUK-1 showed high sorption capacity and high adsorption selectivity for p-xylene over the corresponding m- and o-isomers, and ethylbenzenes...
November 28, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29100162/synthesis-and-application-of-a-new-carboxylated-cellulose-derivative-part-iii-removal-of-auramine-o-and-safranin-t-from-mono-and-bi-component-spiked-aqueous-solutions
#13
Filipe Simões Teodoro, Megg Madonyk Cota Elias, Gabriel Max Dias Ferreira, Oscar Fernando Herrera Adarme, Ranylson Marcello Leal Savedra, Melissa Fabíola Siqueira, Luis Henrique Mendes da Silva, Laurent Frédéric Gil, Leandro Vinícius Alves Gurgel
In the third part of this series of studies, the adsorption of the basic textile dyes auramine-O (AO) and safranin-T (ST) on a carboxylated cellulose derivative (CTA) were evaluated in mono- and bi-component spiked aqueous solutions. Adsorption studies were developed as a function of solution pH, contact time, and initial dye concentration. Adsorption kinetic data were modeled by monocomponent kinetic models of pseudo-first- (PFO), pseudo-second-order (PSO), intraparticle diffusion, and Boyd, while the competitive kinetic model of Corsel was used to model bicomponent kinetic data...
February 15, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29068020/a-microporous-mof-with-a-polar-pore-surface-exhibiting-excellent-selective-adsorption-of-co-2-from-co-2-n-2-and-co-2-ch-4-gas-mixtures-with-high-co-2-loading
#14
Arun Pal, Santanu Chand, Syed Meheboob Elahi, Madhab C Das
A microporous MOF {[Zn(SDB)(L)0.5 ]·S}n (IITKGP-5) with a polar pore surface has been constructed by the combination of a V-shaped -SO2 functionalized organic linker (H2 SDB = 4,4'-sulfonyldibenzoic acid) with an N-rich spacer (L = 2,5-bis(3-pyridyl)-3,4-diaza-2,4-hexadiene), forming a network with sql(2,6L1) topology. IITKGP-5 is characterized by TGA, PXRD and single crystal X-ray diffraction. The framework exhibits lozenge-shaped channels of an approximate size of 4.2 × 5.6 Å2 along the crystallographic b axis with a potential solvent accessible volume of 26%...
November 14, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29047256/analysis-of-genes-with-alternatively-spliced-transcripts-in-the-leaf-root-panicle-and-seed-of-rice-using-a-long-oligomer-microarray-and-rna-seq
#15
Songhwa Chae, Joung Sug Kim, Kyong Mi Jun, Sang-Bok Lee, Myung Soon Kim, Baek Hie Nahm, Yeon-Ki Kim
Pre-mRNA splicing further increases protein diversity acquired through evolution. The underlying driving forces for this phenomenon are unknown, especially in terms of gene expression. A rice alternatively spliced transcript detection microarray (ASDM) and RNA sequencing (RNA-Seq) were applied to differentiate the transcriptome of 4 representative organs of Oryza sativa L. cv. Ilmi: leaves, roots, 1-cm-stage panicles and young seeds at 21 days after pollination. Comparison of data obtained by microarray and RNA-Seq showed a bell-shaped distribution and a co-lineation for highly expressed genes...
October 2017: Molecules and Cells
https://www.readbyqxmd.com/read/29022988/a-microporous-mof-with-open-metal-sites-and-lewis-basic-sites-for-selective-co-2-capture
#16
Jinjie Qian, Qipeng Li, Linfeng Liang, Ting-Ting Li, Yue Hu, Shaoming Huang
A robust indium-organic framework (InOF-15) with open metal sites and Lewis basic sites has been successfully synthesized using a quinoline-based dicarboxylic acid. Moreover, it exhibits high IAST selective CO2 sorption from CO2 /CH4 and CO2 /N2 mixtures at 273 K, which has been attributed to the coexistence of OMSs and LBSs with strong synergistic effects.
October 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28991445/a-permanently-porous-yttrium-organic-framework-based-on-an-extended-tridentate-phosphine-containing-linker
#17
Andrey A Bezrukov, Pascal D C Dietzel
The metal-organic framework [Y(tbpp)]·nDMF (1) was synthesized from yttrium(III) nitrate and the tritopic linker tris(4'-carboxy[1,1'-biphenyl]-4-yl)phosphine (H3 tbpp). The distance between the coordinating atoms of the carboxylate groups of the extended tridentate phosphine linker is more than 1.8 nm, resulting in an average pore dimension of 0.9 nm in the noninterpenetrated metal-organic framework. The material exhibits high thermal stability and permanent porosity after removal of guest molecules from the one-dimensional pore system...
November 6, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28895649/enhanced-trace-co2-capture-on-heteroatom-substituted-rho-zeolites-under-humid-conditions
#18
Quan-Li Ke, Tian-Jun Sun, Xiao-Li Wei, Ya Guo, Shu-Dong Wang
In this paper, boron and copper heteroatoms were successfully incorporated into the frameworks of high-silica RHO zeolite by adopting a bulky alkali metal-crown ether (AMCE) complex as the template. As a consequence, these heteroatom-doped zeolites show both larger micropore surface areas and volumes than those of their aluminosilicate analogue. Proton-type RHO zeolites were then applied for separation of CO2 / CH4 / N2 mixtures so as to weaken the electric field of these zeolites and then decrease the adsorption heat...
September 12, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28880527/two-analogous-polyhedron-based-mofs-with-high-density-of-lewis-basic-sites-and-open-metal-sites-significant-co2-capture-and-gas-selectivity-performance
#19
Bing Liu, Shuo Yao, Xinyao Liu, Xu Li, Rajamani Krishna, Guanghua Li, Qisheng Huo, Yunling Liu
By means of modulating the axial ligand and adopting supermolecular building blocks (SBBs) strategy, two polyhedron-based metal-organic frameworks (PMOFs) have been successfully synthesized [Cu6(C17O9N2H8)3(C6H12N2)(H2O)2(DMF)2]·3DMF·8H2O (JLU-Liu46) and [Cu6(C17O9N2H8)3(C4H4N2)(H2O)2(DMF)2]·3DMF·8H2O (JLU-Liu47), which possess a high density of Lewis basic sites (LBSs) and open metal sites (OMSs). Since the size of axial ligand in JLU-Liu47 is smaller than that in JLU-Liu46, JLU-Liu47 shows larger pore volume and higher BET surface area...
September 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28792198/pillar-layered-metal-organic-framework-with-sieving-effect-and-pore-space-partition-for-effective-separation-of-mixed-gas-c2h2-c2h4
#20
Xu-Jia Hong, Qin Wei, Yue-Peng Cai, Bing-Bing Wu, Hai-Xing Feng, Ying Yu, Ren-Feng Dong
The removal of acetylene from the industrial feed gas to purify the ethylene is an important and challenging issue. The adsorption-based separation is a more environmentally friendly and cost-effective method compared to the current removal approaches such as partial hydrogenation and solvent extraction, while facing the challenge of developing materials with high C2H2/C2H4 selectivity and C2H2 capacity. Herein, by expanding mixed-metal organic frameworks (M'MOFs) structure with high C2H2/C2H4 selectivity, we report a pillar-layered MOF, {[Cd5(MPCZ)2(BDC)3(NO3)2(H2O)4]·G}n (MECS-5), which not only inherits the sieving effects of M'MOF series but also develops its own characteristic-the 2D layer with expanding space and the plane pore-partition group to "cover" it...
August 30, 2017: ACS Applied Materials & Interfaces
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