Unraveling the complexation mechanism of actinide(iii) and lanthanide(iii) with a new tetradentate phenanthroline-derived phosphonate ligand

2020 ◽  
Vol 7 (8) ◽  
pp. 1726-1740 ◽  
Author(s):  
Lei Xu ◽  
Ning Pu ◽  
Gaoyang Ye ◽  
Chao Xu ◽  
Jing Chen ◽  
...  
Keyword(s):  
Complexation Mechanism

The separation and complexation mechanisms of actinide(iii) and lanthanide(iii) with a new phenanthroline-derived phosphonate ligand were studied experimentally and theoretically.

scholarly journals Supercritical Carbon Dioxide as a Green Alternative to Achieve Drug Complexation with Cyclodextrins

2021 ◽  
Vol 14 (6) ◽  
pp. 562
Author(s):  
Mauro Banchero
Keyword(s):  
Release Kinetics ◽  
Drug Bioavailability ◽  
Residual Content ◽  
Supercritical Solvent ◽  
Cyclodextrin Complexation ◽  
Supercritical Fluid Technology ◽  
Conventional Drug ◽  
Size And Morphology ◽  
Solvent Residue ◽  
Complexation Mechanism

Cyclodextrins are widely used in pharmaceutics to enhance the bioavailability of many drugs. Conventional drug/cyclodextrin complexation techniques suffer from many drawbacks, such as a high residual content of toxic solvents in the formulations, the degradation of heat labile drugs and the difficulty in controlling the size and morphology of the product particles. These can be overcome by supercritical fluid technology thanks to the outstanding properties of supercritical CO2 (scCO2) such as its mild critical point, its tunable solvent power, and the absence of solvent residue after depressurization. In this work the use of scCO2 as an unconventional medium to achieve the complexation with native and substituted cyclodextrins of over 50 drugs, which belong to different classes, are reviewed. This can be achieved with different approaches such as the “supercritical solvent impregnation” and “particle-formation” techniques. The different techniques are discussed to point out how they affect the complexation mechanism and efficiency, the physical state of the drug as well as the particle size distribution and morphology, which finally condition the release kinetics and drug bioavailability. When applicable, the results obtained for the same drug with various cyclodextrins, or different complexation techniques are compared with those obtained with conventional approaches.

scholarly journals Feasibility of nanoscale zero-valent iron loaded sediment-based biochar (nZVI-SBC) for simultaneous removal of nitrate and phosphate: high selectivity towards dinitrogen and synergistic mechanism

2021 ◽  
Author(s):  
Xiaohui Liu ◽  
Jia Wei ◽  
Liangang Hou ◽  
Yuhan Zhu ◽  
Yaodong Wu ◽  
...  
Keyword(s):  
High Selectivity ◽  
Phosphate Removal ◽  
Zero Valent Iron ◽  
Polluted Water ◽  
Nitrogen And Phosphorus ◽  
Nanoscale Zero Valent Iron ◽  
Synergistic Mechanism ◽  
Loading Ratio ◽  
Anoxic Environment ◽  
Complexation Mechanism

Abstract In the process of water treatment, excessive nitrogen and phosphorus pollutants are of great concern. Therefore, we prepared nanoscale zero-valent iron loaded on sediment-based biochar (nZVI-SBC) to conduct nitrate and phosphate removal at the same time. The characterization demonstrated that nZVI-SBC was successfully synthesized, which had obvious advantages for larger specific surface area and better dispersion compared with pure nZVI. The batch experiments indicated that the best loading ratio of nZVI to SBC and optimum dosage for nitrate and phosphate were 1:1and 2 g·L-1, respectively. Their removal by nZVI-SBC was an acid-driven process. Anoxic environment was more conducive to the reduction of nitrate while the phosphate removal was fond of oxygen environment. 77.78% of nitrate and 99.21% of phosphate have been successfully removed, mainly depending on reduction and complexation mechanism, respectively. Moreover, nZVI-SBC had higher N2 selectivity and produced less ammonium than nZVI. The interaction between nitrate and phosphate was studied to manifest that they had different degrees of inhibition during the removal of the other. Our research indicated that nZVI-SBC has great potential for remediation of nitrogen and phosphorus polluted water.

Complexation mechanism of cucurbit[6]uril with hexamethylene diammonium cations in saline solution

2014 ◽  
Vol 16 (44) ◽  
pp. 24169-24172 ◽  
Author(s):  
Peng Liu ◽  
Xueguang Shao ◽  
Christophe Chipot ◽  
Wensheng Cai
Keyword(s):  
Saline Solution ◽  
Atomic Level ◽  
Sodium Ions ◽  
Complexation Mechanism

Binding of cucurbit[6]uril (CB[6]) with the hexamethylene diammonium cation (HD2+) in the presence of sodium ions is elucidated at the atomic level.

Porous ceramic membranes for propane–propylene separation via the π-complexation mechanism: unsupported systems

2005 ◽  
Vol 78 (2-3) ◽  
pp. 235-243 ◽  
Author(s):  
K.A. Stoitsas ◽  
A. Gotzias ◽  
E.S. Kikkinides ◽  
Th.A. Steriotis ◽  
N.K. Kanellopoulos ◽  
...  
Keyword(s):  
Porous Ceramic ◽  
Ceramic Membranes ◽  
Complexation Mechanism ◽  
Π Complexation

High selectivity towards small copper ions by a preorganized phenanthroline-derived tetradentate ligand and new insight into the complexation mechanism

2014 ◽  
Vol 43 (33) ◽  
pp. 12470-12473 ◽  
Author(s):  
Cheng-Liang Xiao ◽  
Qun-Yan Wu ◽  
Lei Mei ◽  
Li-Yong Yuan ◽  
Cong-Zhi Wang ◽  
...  
Keyword(s):  
High Selectivity ◽  
Copper Ions ◽  
Tetradentate Ligand ◽  
Complexation Mechanism ◽  
Insight Into

A preorganized tetradentate phenanthroline-derived amide ligand was found to show high selectivity towards small copper ions.

Elucidation of the complexation mechanism between (+)-usnic acid and cyclodextrins studied by isothermal titration calorimetry and phase-solubility diagram experiments

2009 ◽  
Vol 22 (3) ◽  
pp. 232-241 ◽  
Author(s):  
Freimar Segura-Sanchez ◽  
Kawthar Bouchemal ◽  
Geneviève Lebas ◽  
Christine Vauthier ◽  
Néréide S. Santos-Magalhaes ◽  
...  
Keyword(s):  
Isothermal Titration Calorimetry ◽  
Usnic Acid ◽  
Solubility Diagram ◽  
Titration Calorimetry ◽  
Phase Solubility ◽  
Complexation Mechanism ◽  
Phase Solubility Diagram

Preparation, complexation mechanism and properties of nano-complexes of Astragalus polysaccharide and amphiphilic chitosan derivatives

2017 ◽  
Vol 161 ◽  
pp. 261-269 ◽  
Author(s):  
Minghua Lai ◽  
Jingnan Wang ◽  
Jiayun Tan ◽  
Jiahao Luo ◽  
Li-Ming Zhang ◽  
...  
Keyword(s):  
Chitosan Derivatives ◽  
Astragalus Polysaccharide ◽  
Complexation Mechanism

The Influence of Coexisting Ions on Adsorption-Flotation of Pb2+ in Water by Gordona Amarae

2012 ◽  
Vol 433-440 ◽  
pp. 183-187 ◽  
Author(s):  
Shu Juan Dai ◽  
Shu Yong Yang ◽  
Dong Qin Zhou
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Alkaline Earth ◽  
Surface Complexation ◽  
Alkaline Earth Metals ◽  
Processing Waste ◽  
Precipitation Mechanism ◽  
Heavy Metals Ions ◽  
Complexation Mechanism ◽  
Coexisting Ions

Processing waste water of heavy metals by biosorption-flotation was effected by many factors. Existing coexisting ions in waste water is a important factor. The influence of coexisting alkaline-earth metals ions and heavy metals ions of Cd 2+, Cu 2+, Hg 2+, Zn 2+, As 3+, on results of adsorbing and floating Pb2+ in waste water was examined by using Gordona amarae as adsorbent and laurylamine as collector. The results showed that different sort of heavy metals ions and alkaline-earth metals ions have different influences on biosorption-flotation. The influences on biosorption-flotation by coexisting ions showed that ions exchange mechanism, surface complexation mechanism, oxidation-deoxidize and inorganic micro precipitation mechanism exist probably

Investigation of the Ga Complexation Behaviour of the Siderophore Desferrioxamine B

2017 ◽  
Vol 262 ◽  
pp. 643-646 ◽  
Author(s):  
Rohan Jain ◽  
Francesca Cirina ◽  
Peter Kaden ◽  
Katrin Pollmann
Keyword(s):  
Critical Element ◽  
Electronic Industry ◽  
Suitable Candidate ◽  
Selective Sorption ◽  
Industrial Wastewaters ◽  
Desferrioxamine B ◽  
Complexation Mechanism

Gallium (Ga) is a critical element for the electronic industry, however, its long-term supply is not assured. Thus, the recovery of Ga from industrial wastewaters is important. Selective sorption is a recommended technology for the recovery of Ga from industrial wastewaters, however, selective sorbents are elusive. Desferrioxamine B (DFOB), a hydroxomate siderophore that is known to be highly selective towards Fe3+, is tested for its ability to complex Ga. This study demonstrated that DFOB forms 1:1 complex with Ga and the maximum Qe-Ga is 124.4 mg of Ga complexed per g of DFOB. Further, the complexation mechanism of Ga3+ and Fe3+ with DFOB is similar, as indicated by NMR, suggesting that the selectivity of DFOB towards Fe3+ will be extended to Ga3+ as well. Thus, DFOB seems to be a suitable candidate for the sorption of Ga from industrial wastewaters.

scholarly journals Removal of Cr (III) Ions from Wastewater using Sawdust and Rice Husk Biochar Pyrolyzed at Low Temperature

2016 ◽  
Vol 4 (4) ◽  
pp. 44-54 ◽  
Author(s):  
Sunethra Kanthi Gunatilake
Keyword(s):  
Functional Groups ◽  
Rice Straw ◽  
Active Sites ◽  
Adsorption Sites ◽  
Saw Dust ◽  
Optimum Ph ◽  
Intra Particle Diffusion ◽  
Rice Straw Biochar ◽  
Rice Husk Biochar ◽  
Complexation Mechanism

Sorption capacity of two different biochar (saw dust and rice straw) was evaluated in the recovery of chromium from wastewater. The optimum pH was 5-7 for recovery of Cr(III). Optimum yield was received after 1 hour contacting time with an adsorbent dose of 1 g/L and initial concentration was ∼20 mg/L. Cr(III) ions were transported to biochar surface through adsorption and intra-particle diffusion process. Langmuir and Freundlich kinetic parameters indicated that the affinity of the sorbent towards the uptake of Cr(III) ions and adsorptions were favorable. According to FTIR analysis of Cr(III) ions bound to active sites either electrostatic attraction or complexation mechanism. These results indicated that carbonyl, hydroxyl, amine and halides are the main adsorption sites in saw dust and rice straw biochar and these functional groups complexes with Cr(III) ions in the aqueous solution and changed the chemical environment of the functional groups in the biochar.

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