scholarly journals Thiosemicarbazide-Linked Covalent Organic Framework: Preparation, Properties and Applications

2021 ◽  
Author(s):  
Heping Wang ◽  
Tengteng He ◽  
Dandan Quan ◽  
Tong Wang ◽  
Cong Li ◽  
...  
Keyword(s):  
Metal Ions ◽  
Building Blocks ◽  
Batch Adsorption ◽  
Structure And Property ◽  
Covalent Organic Framework ◽  
Pseudo Second Order ◽  
The One ◽  
First Time ◽  
Uniform Pore Size ◽  
Organic Framework

Abstract With the unique advantages in structure and property, covalent organic frameworks have been widely employed for separation and enrichment. In this work, the thiosemicarbazide-linked covalent organic framework (TpTc) was prepared by using 1,3,5-triformylphloroglucinol and non-rigid thiosemicarbazide as building blocks for the first time. The as-prepared TpTc COF was fully characterized, presenting an agaric-like structure, large specific surface area (63.5 m2 g-1), uniform pore size distribution (1.36 nm), inherent porosity and ordered crystallinity. The potential of TpTc as adsorbent for metal ions capture was investigated by static batch adsorption experiment using the one-factor procedure. The maximum adsorption capacities of 73.50, 56.53 and 94.13 mg g-1 were obtained for Cu (II), Pb (II) and Cd (II) at natural pH, respectively. The anchoring of three metal ions onto TpTc is a multi-layer sorption involving chemical adsorption, and obeys the Freundlich and pseudo-second-order model. According to XPS analysis, the adsorption mechanism may be attributed to the coordination and electrostatic interaction between metal ions and N, O and S atoms on TpTc COF. This work not only provides a candidate for the application of COFs in metal ions capture, but also a reference for exploring functional design of COFs .

scholarly journals Kinetics and isotherm modeling of Pb(II) and Cd(II) sequestration from polluted water onto tropical ultisol obtained from Enugu Nigeria

2021 ◽  
Vol 11 (4) ◽  
Author(s):  
Theresa C. Umeh ◽  
John K. Nduka ◽  
Kovo G. Akpomie
Keyword(s):  
Metal Ions ◽  
Low Cost ◽  
Water Environment ◽  
Standard Technique ◽  
Soil Surface ◽  
Cost Effective ◽  
Polluted Water ◽  
Batch Adsorption ◽  
Lead And Cadmium ◽  
Pseudo Second Order

AbstractDeterioration in soil–water environment severely contributed by heavy metal bioavailability and mobility on soil surface and sub-surface due to irrational increase in wastewater discharge and agrochemical activities. Therefore, the feasibility of adsorption characteristics of the soil is paramount in curbing the problem of micropollutant contamination in the farming vicinity. Soil from a farming site in a populated area in Enugu, Nigeria was collected and tested to measure the lead and cadmium contents using atomic absorption spectrophotometer (AAS). The adsorption potency of the ultisol soil was estimated for identifiable physicochemical properties by standard technique. The mean activity concentration of Pb2+ and Cd2+ was 15.68 mg/kg and 3.01 mg/kg. The pH, temperature, metal concentration and contact time adsorptive effect on the Pb2+ and Cd2+ uptake was evaluated by batch adsorption technique. The Langmuir, Freundlich and Temkin models were fitted into equilibrium adsorption data and the calculated results depict a better and satisfactory correlation for Langmuir with higher linear regression coefficients (Pb2+, 0.935 and Cd2+, 0.971). On the basis of sorption capacity mechanism of the soil, pseudo-second-order model best described the kinetics of both metal ions retention process. The results of the present study indicated that the soil being a low cost-effective adsorbent can be utilized to minimize the environmental risk impact of these metal ions.

scholarly journals A Water-Soluble Copper-Immobilized Covalent Organic Framework Functioning as an “OFF–ON” Fluorescent Sensor for Amino Acids

2021 ◽  
Author(s):  
Lamiaa Reda Ahmed ◽  
Ahmed F. M. EL-Mahdy ◽  
Cheng-Tang Pan ◽  
Shiao-Wei Kuo
Keyword(s):  
Amino Acids ◽  
Fluorescent Sensor ◽  
Water Soluble ◽  
One Pot ◽  
Covalent Organic Framework ◽  
The One ◽  
Organic Framework

In this paper, we describe the construction of a new fluorescent hydroxyl- and hydrazone-based covalent organic framework (TFPB-DHTH COF) through the one-pot polycondensation of 1,3,5-tris(4-formylphenyl)benzene (TFPB) and 2,5-dihydroxyterephthalohydrazide (DHTH) under...

scholarly journals Multifunctional carbon nanotubes covalently coated with imine-based covalent organic frameworks: exploring structure–property relationships through nanomechanics

Nanoscale ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 1128-1137 ◽  
Author(s):  
Alicia Moya ◽  
Mercedes Hernando-Pérez ◽  
Marta Pérez-Illana ◽  
Carmen San Martín ◽  
Julio Gómez-Herrero ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Synthesis ◽  
Covalent Organic Frameworks ◽  
Structure Property ◽  
One Pot ◽  
Covalent Organic Framework ◽  
Mwcnt Surface ◽  
Structure Property Relationships ◽  
First Time ◽  
Organic Framework

Hybridization of imine-based covalent organic framework (COF-300) on oxidized MWCNT surface have been designed and succesfully developed for the first time in one-pot chemical synthesis.

scholarly journals Self-standing and flexible covalent organic framework (COF) membranes for molecular separation

2020 ◽  
Vol 6 (41) ◽  
pp. eabb1110
Author(s):  
Jiangtao Liu ◽  
Gang Han ◽  
Dieling Zhao ◽  
Kangjia Lu ◽  
Jie Gao ◽  
...  
Keyword(s):  
Building Blocks ◽  
Shape Selectivity ◽  
Honeycomb Lattice ◽  
Free Standing ◽  
Covalent Bonds ◽  
Separation Science ◽  
Covalent Organic Framework ◽  
Molecular Building Blocks ◽  
Almost All ◽  
Organic Framework

Almost all covalent organic framework (COF) materials conventionally fabricated by solvothermal method at high temperatures and pressures are insoluble and unprocessable powders, which severely hinder their widespread applications. This work develops an effective and facile strategy to construct flexible and free-standing pure COF membranes via the liquid-liquid interface-confined reaction at room temperature and atmospheric pressure. The aperture size and channel chemistry of COF membranes can be rationally designed by bridging various molecular building blocks via strong covalent bonds. Benefiting from the highly-ordered honeycomb lattice, high solvent permeances are successfully obtained and follow the trend of acetonitrile > acetone > methanol > ethanol > isopropanol. Interestingly, the imine-linked COF membrane shows higher nonpolar solvent permeances than b-ketoenamine-linked COF due to their difference in pore polarity. Both kinds of COF membranes exhibit high solvent permeances, precise molecular sieving, excellent shape selectivity, and sufficient flexibility for membrane-based separation science and technology.

Binuclear complexes as tectons in designing supramolecular solid-state architectures

2005 ◽  
Vol 77 (10) ◽  
pp. 1685-1706 ◽  
Author(s):  
Marius Andruh
Keyword(s):  
Solid State ◽  
Metal Ions ◽  
Coordination Polymers ◽  
Building Blocks ◽  
Heterometallic Complexes ◽  
Binuclear Complexes ◽  
Rich Variety ◽  
Network Topologies ◽  
The One

Oligonuclear complexes as well as coordination polymers with various network topologies can be obtained by using homo- or heterobinuclear complexes as starting materials. These building blocks are stable complexes, where the metal ions are held together by compartmental ligands, or alkoxo-bridged Cu(II) species. The binuclear nodes can be connected through appropriate exo-dentate ligands, or through metal-containing anions (e.g., [M(CN)6]3-, M = CrIII, FeIII, CoIII). A rich variety of 3d-3d and 3d-4f heterometallic complexes, with interesting architectures and topologies of the spin carriers, has been obtained. A particular case is the one concerning the 3d-4f binuclear nodes. Following this strategy, we were able to obtain coordination polymers containing three different spin carriers (2p-3d-4f; 3d-3d'-4f).

Amidinothiourea‐linked covalent organic framework for the adsorption of heavy metal ions

2021 ◽  
Author(s):  
Heping Wang ◽  
Bang Feng ◽  
Qianwen Zhang ◽  
Qiang Du ◽  
Qiuhong Bai ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Covalent Organic Framework ◽  
Organic Framework

scholarly journals Mechanism unravelling for ultrafast and selective 99TcO4− uptake by a radiation-resistant cationic covalent organic framework: a combined radiological experiment and molecular dynamics simulation study

2019 ◽  
Vol 10 (15) ◽  
pp. 4293-4305 ◽  
Author(s):  
Linwei He ◽  
Shengtang Liu ◽  
Long Chen ◽  
Xing Dai ◽  
Jie Li ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Sorption Kinetics ◽  
Dynamics Simulation ◽  
Uptake Capacity ◽  
Covalent Organic Framework ◽  
Radiation Resistant ◽  
First Time ◽  
Exchange Selectivity ◽  
Organic Framework

Separation of TcO4– by a cationic covalent organic framework is achieved for the first time, showing advantages of extremely fast sorption kinetics, ultrahigh uptake capacity, good anion-exchange selectivity, and excellent radiation resistance.

Covalent organic framework-regulated ionic transportation for high-performance lithium-ion batteries

2019 ◽  
Vol 7 (46) ◽  
pp. 26540-26548 ◽  
Author(s):  
Yucheng Wen ◽  
Xianshu Wang ◽  
Yan Yang ◽  
Mingzhu Liu ◽  
Wenqiang Tu ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Lithium Ion Batteries ◽  
High Performance ◽  
Lithium Ion ◽  
Transition Metal Ions ◽  
Ion Migration ◽  
Covalent Organic Framework ◽  
Polymer Separator ◽  
Organic Framework

A polymer separator modified with a covalent organic framework can effectively accelerate lithium ion migration and immobilize transition metal ions.

Fabrication of bilayer tetrathiafulvalene integrated surface covalent organic frameworks

2016 ◽  
Vol 18 (26) ◽  
pp. 17356-17359 ◽  
Author(s):  
Wei-Long Dong ◽  
Shu-Ying Li ◽  
Jie-Yu Yue ◽  
Cheng Wang ◽  
Dong Wang ◽  
...  
Keyword(s):  
Building Blocks ◽  
Covalent Organic Frameworks ◽  
Covalent Organic Framework ◽  
Organic Framework

A bilayer covalent organic framework (COF) of TTF-based building blocks was obtained by imine reaction between tetrathiafulvalene tetraaldehyde (4ATTF) andp-phenylenediamine (PPDA).

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