Functionalized Mesoporous Silicas with Crown Ether Moieties for Selective Adsorption of Lithium Ions in Artificial Sea Water

2014 ◽  
Vol 14 (11) ◽  
pp. 8845-8851 ◽  
Author(s):  
Sung Soo Park ◽  
Madhappan Santha Moorthy ◽  
Hyun-Jin Song ◽  
Chang-Sik Ha
Keyword(s):  
Crown Ether ◽  
Sea Water ◽  
Selective Adsorption ◽  
Mesoporous Silicas ◽  
Lithium Ions

scholarly journals Synthesis of High Specific Surface Lithium ion Sieve Templated by Bacterial Cellulose for Selective Adsorption of Li+

2021 ◽  
Author(s):  
Xudong Zheng ◽  
Ang Li ◽  
Dandan Wang ◽  
Da Xia ◽  
Yuzhe Zhang ◽  
...  
Keyword(s):  
Bacterial Cellulose ◽  
Sea Water ◽  
Hydrothermal Reaction ◽  
Salt Lake ◽  
Selective Adsorption ◽  
Lithium Ion ◽  
Nuclear Industry ◽  
Maximum Adsorption Capacity ◽  
Lithium Ions ◽  
Adsorption Effect

Abstract In recent years, the lithium market has ushered in a golden period of development. With the development of batteries, ceramics, glass, lubricants, refrigerants, the nuclear industry and the optoelectronics industry, the demand for lithium has grown rapidly, and continuous mining has led to scarcity of land resources. On the other hand, due to the rich lithium resources in sea water and salt lake brines. How to selectively adsorb and separate lithium ions from seawater and salt lake brine has attracted more and more scholars' attention and research. Lithium ion sieve stands out because of its excellent performance of specific adsorption and separation of lithium ions. This article reports the preparation of mesoporous TiO2 and LiOH hydrothermal reaction using bacterial cellulose as a biological template. After calcination at 600°C, spinel lithium titanium oxide Li2TiO3 is formed. H2TiO3 was obtained by eluting the precursor with HCl eluent. FT-IR, SEM and XRD were used to characterize Li2TiO3 and H2TiO3. The adsorption performance of H2TiO3 was studied through adsorption pH, adsorption kinetics, adsorption isotherms, competitive adsorption and so on. The results show that H2TiO3 is a single layer chemical adsorption process, which has a good adsorption effect on lithium ions at pH 11.0, with the maximum adsorption capacity can reach 35.45 mg·g− 1. The lithium ion sieve has selective adsorption to Li+, and its distribution coefficient is 2242.548 mL g− 1. It may be predicted that the lithium-ion sieve prepared by biological template has a broad application prospect.

Sol–Gel Derived Benzo-Crown Ether-Functionalized Silica Gel for Selective Adsorption of Ca2+ Ions

2019 ◽  
Vol 64 (4) ◽  
pp. 1378-1384 ◽  
Author(s):  
Nan You ◽  
Yue-Xian Song ◽  
Hai-Rong Wang ◽  
Li-Xia Kang ◽  
Hong-Tao Fan ◽  
...  
Keyword(s):  
Crown Ether ◽  
Silica Gel ◽  
Selective Adsorption ◽  
Sol Gel ◽  
Functionalized Silica

Selective adsorption of bisphenol A by organic–inorganic hybrid mesoporous silicas

2011 ◽  
Vol 138 (1-3) ◽  
pp. 184-190 ◽  
Author(s):  
Yong-Ho Kim ◽  
Byunghwan Lee ◽  
Kwang-Ho Choo ◽  
Sang-June Choi
Keyword(s):  
Bisphenol A ◽  
Selective Adsorption ◽  
Mesoporous Silicas ◽  
Inorganic Hybrid

Preparation of Crown‐Ether‐Functionalized Polysulfone Membrane by In Situ Surface Grafting for Selective Adsorption and Separation of Li +

2020 ◽  
Vol 5 (11) ◽  
pp. 3321-3329
Author(s):  
Jixue Li ◽  
Hong Yi ◽  
Mingxia Wang ◽  
Feng Yan ◽  
Quanji Zhu ◽  
...  
Keyword(s):  
Crown Ether ◽  
Selective Adsorption ◽  
Surface Grafting ◽  
Polysulfone Membrane

Ionic strength effect on extraction of potassium complexed with crown ether 18-crown-6. Preliminary communication

1981 ◽  
Vol 59 (10) ◽  
pp. 1548-1551 ◽  
Author(s):  
Izaak Maurits Kolthoff
Keyword(s):  
Crown Ether ◽  
Aqueous Phase ◽  
Sea Water ◽  
Critical Study ◽  
Salting Out ◽  
Ionic Strength Effect ◽  
Sodium Magnesium ◽  
Phase Selectivity ◽  
Preliminary Communication

As part of a broad study of the factors which affect extraction of salts of cations, complexed with an uncharged ligand, L, a critical study has been made of the extraction into dichloromethane of K+ complexed with 18-crown ether-6 in the form of picrate (LKPi). In using extraction analysis for the determination of very small concentrations of K+ in the presence of other salts activities of (K+)w and (Pi−)w in the aqueous phase must be written in the expression for Kext(LKPi). The salting out effect on P(L) = [L]0/[L]w can greatly affect the concentration of potassium ions left in the aqueous phase. Selectivity of K+/Na+ in extractions with 18-crown-6 has been determined.The extraction method is very suitable for the determination of traces of potassium in salts of sodium, magnesium, and calcium after calibration with, e.g., potassium chloride in potassium-free salts and also, after proper calibration, in routine analysis of liquids which contain little K+ and a large excess of Na+ (e.g. sea water, blood serum).

Thiol functionalized mesoporous silicas for selective adsorption of precious metals

2012 ◽  
Vol 35 ◽  
pp. 20-26 ◽  
Author(s):  
Huajun Zheng ◽  
Denghong Hu ◽  
Lei Zhang ◽  
Chun’an Ma ◽  
Tom Rufford
Keyword(s):  
Selective Adsorption ◽  
Precious Metals ◽  
Mesoporous Silicas

scholarly journals The study on preparing absorbent of potassium nickel hexacyanoferrate (II) loaded zeolite for removal of cesium from radioactive waste solutions and stable solidification method for those spent absorbents

2021 ◽  
Vol 7 (1) ◽  
pp. 28-36
Author(s):  
Quynh Luong Pham ◽  
Hoang Lan Nguyen ◽  
Van Chinh Nguyen ◽  
Huu Anh Vuong ◽  
Cao Nguyen Luu ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Sea Water ◽  
Selective Adsorption ◽  
Pure Water ◽  
Decontamination Factor ◽  
Precipitation Method ◽  
Radioactive Cesium ◽  
Exchange Equilibrium ◽  
Zeolite X ◽  
Cs Ions

The development of cesium selective adsorbent is urgent subject for the decontamination of intermediate and high level water from nuclear facilities especially in nuclear accidents. For the selective adsorption and stable immobilization of radioactive cesium, K-Ni- hexacyanoferrate (II) loaded zeolite (FCzeolite) (synthesized zeolite of Hanoi University of Science and Technology) were prepared by impregnation/precipitation method. The ion exchange equilibrium of Cs+ for composites FC-zeolite was attained within 5 h and estimated to be above 97% in Cs+ 100mg/l solution at pH: 4-10. Ion exchange capacity of Cs+ ions (Qmax) for FC-zeoliteX was reached 158.7 and 98.0 mg/g in pure water and sea water respectively.Those values for FC-zeolite A was 103.1 and 63.7 mg/g. Decontamination factor (DF) of FC-zeolite X for 134Cs was 149.7 và 107.5 in pure water and sea water respectively. Initial radioactivity of 134Cs ion solution infect to decontamination factor. KNiFC-zeolite X after uptaked Cs (CsFC- zeolite X) was solidificated in optimal experimental conditions: Mixing CsFC-zeolite X with additive of Na2B4O7 (5%), temperature calcined 900oC for 2h in air. Solid forms was determined some of parameters: Cs immobilization, mechanical stability, volume reduction after calcination (%) and leaching rate of Cs+ ions in solution.

scholarly journals Crown Ether Grafted Graphene Oxide/Chitosan/Polyvinyl Alcohol Nanofiber Membrane for Highly Selective Adsorption and Separation of Lithium Ion

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2668
Author(s):  
Xudong Zheng ◽  
Ang Li ◽  
Jie Hua ◽  
Yuzhe Zhang ◽  
Zhongyu Li
Keyword(s):  
Graphene Oxide ◽  
Crown Ether ◽  
Polyvinyl Alcohol ◽  
Adsorption Capacity ◽  
Selective Adsorption ◽  
Regeneration Ability ◽  
Maximum Adsorption Capacity ◽  
Nanofiber Membrane ◽  
Functionalized Graphene Oxide ◽  
Static Adsorption

Nanofiber membranes were successfully prepared with crown ether (CE) functionalized graphene oxide (GO), chitosan (CS), and polyvinyl alcohol (PVA) by low-temperature thermally induced liquid–liquid phase separation. The physical and chemical properties and adsorption performance of nanofiber membrane were studied through SEM, FT-IR, XRD, and static adsorption experiments. The results show that the specific surface area of the nanofiber membrane is as high as 101.5 m2∙g−1. The results of static adsorption experiments show that the maximum adsorption capacity of the nanofiber membrane can reach 168.50 mg∙g−1 when the pH is 7.0. In the selective adsorption experiment, the nanofiber membrane showed high selectivity for Li+ in salt lake brine. After five cycles, the material still retains 88.31% of the adsorption capacity. Therefore, it is proved that the material has good regeneration ability.

Synthesen und Kristallstrukturen der Kronenether-Komplexe [Li3(12-Krone-4)3O2CCH3] [Cd(Se4)2], {[K(18-Krone-6)]2[Hg(Se4)2]}2 und [Na(15-Krone-5)]NO3 / Syntheses and Crystal Structures of the Crown Ether Complexes [Li3(12-Crown-4)33O2CCH3][Cd(Se4)2], {[K(18-Crown-6)]2[Hg(Se4)2]}2, and [Na(15-Crown-5)]NO3

1989 ◽  
Vol 44 (4) ◽  
pp. 444-454 ◽  
Author(s):  
Gertrud Kräuter ◽  
Frank Weller ◽  
Kurt Dehnicke
Keyword(s):  
Crown Ether ◽  
Ion Pairs ◽  
Sodium Atom ◽  
Ethanolic Solution ◽  
Lithium Ions ◽  
Space Group ◽  
Crown Ether Complexes ◽  
Structure Determinations ◽  
Centrosymmetric Dimers ◽  
Oxygen Atoms

[Li3(12-crown-4)3O2CCH3][Cd(Se4)2] has been prepared by the reaction of [Li(12-crown-4)]2Se6 with Cd(C2CCH3)2 in ethanolic solution. The corresponding polyselenide complex of mercury is formed by the reaction of [K(18-crown-6)]2Se6 with Hg(O2CCH3)2 in the same solvent. Both com pounds form dark red crystals, which were characterized by single crystal X-ray structure determinations. The only product to be isolated from the reaction of Bi(NO3)3·5H2O with [Na( 15-crown-5)]2Se6 in ethanolic solution was [Na(15-crown-5)]NO3, whose structure has also been determined. [Li3(12-crown-4)3O2CCH3][Cd(Se4)2]: space group Pbca, Z = 8. 1404 observed independent reflexions. R = 0.097. Lattice dimensions (19 °C): a = 1981.5(6). b = 1400.3( 1), c = 3268.9(9) pm. The compound forms a dicationic ensemble, in which three lithium ions coordinate with the oxygen atoms of the acetate ion. In the anions the cadmium atom is coordinated tetrahedrally by four selenium atoms of two Se42- units.{[K (18-crown-6)]2[Hg(Se4)2]}2: space group P 1, Z = 1. 3210 observed independent reflexions, r = 0.055. Lattice dimensions (19 °C): a = 1057.4(2). b = 1130.6(2), c = 2000.1(2) pm. α = 88.52(1)°, β = 85.86(1)°, γ = 66.22(1)°. The com pound has a complex ionic structure, in which the formula units form centrosymmetric dimers through K-O contacts between two cations. In addition there are K···Se contacts with the spiro-bicyclic anions, which - together with 6 K-O bonds within the crowns - lead to the coordination number of 8 for the remaining potassium ions.[Na(15-crown-5)]NO3: space group P212121, Z = 4. 1211 observed independent reflexions. R = 0.052. Lattice dimensions (20 °C): a = 912.9(2). b = 989.6(1). c = 1658.3(3) pm. The compound forms ion pairs, in which the sodium atom coordinates with the five oxygen atoms oi the crown ether, as well as with two oxygen atoms of the nitrate ion with Na -O bond lengths of 240 and 247 pm.

Sign in / Sign up

Export Citation Format

Share Document