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Stefan Dittmar, Frederik Zietzschmann, Maike Mai, Eckhard Worch, Martin Jekel, Aki Sebastian Ruhl
Adsorption onto activated carbon is a promising option for removing organic micro-pollutants (OMPs) from wastewater treatment plant (WWTP) effluents. The heterogeneity of activated carbons and adsorption competition between OMPs and adsorbable compounds of the effluent organic matter (EfOM) complicate the prediction of OMP removals. Thus, reliable and simple test systems are desirable. For this study, batch experiments with powdered activated carbon (PAC) were carried out to examine methyl orange (MO) as a selected surrogate competitor to simulate EfOM adsorption competition...
June 11, 2018: Environmental Science & Technology
Hongming He, De-Yu Zhang, Feng Guo, Fuxing Sun
A versatile microporous zinc(II) MOF (1) with plentiful Lewis basic sites and open metal sites synchronously has been synthesized successfully. The resultant microporous material displays excellent selectivity adsorption for small gases. The IAST selectivity values for CO2 /CH4 , C2 H6 /CH4 , CO2 /N2 , and C3 H8 /CH4 are 7, 21, 38, and 125 at 101 kPa and 298 K, respectively. 1 exhibits remarkably heterogeneous catalytic performance for acid-base one-pot reactions. Furthermore, 1 exhibits recyclable selective detectability for TNP...
June 7, 2018: Inorganic Chemistry
Ilia Kochetygov, Safak Bulut, Mehrdad Asgari, Wendy L Queen
Metal-organic frameworks (MOFs) are porous, tunable crystalline materials that are attracting widespread scientific attention for their potential use in post-combustion CO2 capture. In this work, we report the synthesis of a new ligand, 1,3-bis(4-carboxyphenyl)-4,5-dihydro-1H-imidazol-3-ium tetrafluoroborate, H2Sp5-BF4, that is subsequently used for the construction of a novel MOF, Cu-Sp5-EtOH. This highly crystalline material has a charged framework that is expected to give rise to high CO2/N2 selectivity...
May 30, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Yao Wang, Minghui He, Xiaoxia Gao, Saidan Li, Yabing He
The ligand truncation strategy provides facile access to a wide variety of linkers for the construction of MOFs bearing diverse structures and intriguing properties. In this work, we employed this strategy to design and prepare a novel bent diisophthalate ligand, and used it to successfully construct a copper-based MOF ZJNU-51 with the formula of [Cu2L(H2O)2]·5DMF (H4L = 5,5'-(triphenylamine-4,4'-diyl) diisophthalic acid), which was thoroughly characterized by various techniques including FTIR, TGA, PXRD and single-crystal X-ray diffraction...
May 14, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
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 adsorbed phases. The investigated system involves the adsorbent Zorbax 300SB-C18, as well as phenetole and 4- tert-butylphenol 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, to account for nonidealities in the liquid phase...
May 15, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Jamey K Bower, Dushyant Barpaga, Sebastian Prodinger, Rajamani Krishna, H 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...
May 2, 2018: ACS Applied Materials & Interfaces
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...
April 3, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Qiuyu Lu, Yunchao Ma, Hui Li, Xinyu Guan, Yusran Yusran, Ming Xue, Qianrong Fang, Yushan Yan, Shilun Qiu, Valentin Valtchev
Chemical functionalization of covalent organic frameworks (COFs) is critical for tuning their properties and broadening their potential applications. However, the introduction of functional groups, especially to three-dimensional (3D) COFs, still remains largely unexplored. Reported here is a general strategy for generating a 3D carboxy-functionalized COF through postsynthetic modification of a hydroxy-functionalized COF, and for the first time exploration of the 3D carboxy-functionalized COF in the selective extraction of lanthanide ions...
February 19, 2018: Angewandte Chemie
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 the presence of moisture must be taken into consideration. Herein, we have constructed a microporous metal-organic framework (MOF) {[Co(OBA)(L)0.5 ]⋅S}n (IITKGP-8), by employing a V-shaped organic linker with an azo-functionalized N,N' spacer forming a 3D network with mab topology and 1D rhombus-shaped channels along the crystallographic 'b' axis with a void volume of 34...
April 17, 2018: Chemistry: a European Journal
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
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
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
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
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
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
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
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
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
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
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
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