scholarly journals Ion-imprinted modified molecular sieves show the efficient selective adsorption of chromium(vi) from aqueous solutions

RSC Advances ◽  
2020 ◽  
Vol 10 (71) ◽  
pp. 43425-43431
Author(s):  
Junwen Li ◽  
Haiming Cheng
Keyword(s):  
Aqueous Solutions ◽  
Molecular Sieves ◽  
Molecular Sieve ◽  
Selective Adsorption ◽  
Chromium Vi ◽  
Ion Imprinted ◽  
Support Matrix

Molecular sieve 5A was modified with (3-aminopropyl) triethoxysilane (APTES) as the support matrix, on which 4-VP was used as the ionic imprinting group.

Preparation and adsorption characteristics of an imprinted polymer for selective removal of Cr(vi) ions from aqueous solutions

2014 ◽  
Vol 2 (42) ◽  
pp. 17952-17961 ◽  
Author(s):  
Zhongqi Ren ◽  
Delong Kong ◽  
Keyuan Wang ◽  
Weidong Zhang
Keyword(s):  
Aqueous Solutions ◽  
Selective Adsorption ◽  
Bulk Polymerization ◽  
Functional Monomer ◽  
Ion Imprinted Polymer ◽  
Imprinted Polymer ◽  
High Adsorption ◽  
Ion Imprinted ◽  
Vinyl Pyridine ◽  
High Adsorption Capacity

To achieve a fast adsorption rate and a high adsorption capacity in the selective adsorption of Cr(vi) from wastewater, a novel Cr(vi) ion imprinted polymer (Cr(vi)-IIP) was synthesized by bulk polymerization with 4-vinyl pyridine (4-VP) as a functional monomer.

scholarly journals MEMBRANES FOR ULTRAFILTRATION, OF GRADUATED FINENESS DOWN TO MOLECULAR SIEVES

1928 ◽  
Vol 12 (2) ◽  
pp. 187-200 ◽  
Author(s):  
J. W. McBain ◽  
S. S. Kistler
Keyword(s):  
Aqueous Solutions ◽  
Potassium Chloride ◽  
Molecular Sieves ◽  
Molecular Sieve ◽  
Colloidal Particles ◽  
Chief Factor ◽  
Fair Proportion ◽  
Diffusion Dialysis

The use of cellophane in ultrafiltration is recommended. It is shown that after it has been swollen in water it does not hold back molecules such as sucrose but that it holds back all but the finest colloidal particles. Two methods are given for progressively decreasing the size of the pores until the cellophane becomes a very fine molecular sieve. A sieve structure as the chief factor seems most in accordance with our experience of this and other ultrafilters. Collodion membranes may also be used as molecular sieves but their properties are inconstant. Bedicher is a very fine and rapid filtering ultrafilter and pig's bladder holds back a fair proportion of such molecules as sucrose and potassium chloride. Notes are made on the behavior of cellophane in aqueous and non-aqueous solutions. It is emphasized that ultrafiltration is distinctive and has but little relation to diffusion, dialysis, osmosis, electroosmosis or thermodynamics.

Selective adsorption of uranium(VI) from aqueous solutions using the ion-imprinted magnetic chitosan resins

2012 ◽  
Vol 366 (1) ◽  
pp. 165-172 ◽  
Author(s):  
Limin Zhou ◽  
Chao Shang ◽  
Zhirong Liu ◽  
Guolin Huang ◽  
Adesoji A. Adesina
Keyword(s):  
Aqueous Solutions ◽  
Selective Adsorption ◽  
Magnetic Chitosan ◽  
Ion Imprinted

Synthesis of novel ion-imprinted polymers by two different RAFT polymerization strategies for the removal of Cs(i) from aqueous solutions

RSC Advances ◽  
2015 ◽  
Vol 5 (17) ◽  
pp. 12517-12529 ◽  
Author(s):  
Xiangguo Meng ◽  
Yan Liu ◽  
Minjia Meng ◽  
Zheyu Gu ◽  
Liang Ni ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Raft Polymerization ◽  
Surface Imprinting ◽  
Imprinted Polymers ◽  
Surface Imprinting Technique ◽  
Ion Imprinted ◽  
Ion Imprinted Polymers ◽  
Support Matrix

In this work, two novel Cs(i) ion-imprinted polymers (Cs(i)-IIP1 and Cs(i)-IIP2) have been prepared by surface imprinting technique with different RAFT polymerization strategies based on support matrix of SBA-15.

Molecular Sieve Based Chemical Sensors

1994 ◽  
Vol 371 ◽  
Author(s):  
Kenneth J. Balkus ◽  
Laura J. Sottile ◽  
Hoan Nguyen ◽  
Scott J. Riley ◽  
Bruce E. Gnade
Keyword(s):  
Chemical Sensors ◽  
Molecular Sieves ◽  
Molecular Sieve ◽  
Chemical Sensor ◽  
Selective Adsorption ◽  
Capacitance Measurements ◽  
Saw Devices ◽  
Signature Change ◽  
Shape Selective ◽  
Target Molecules

AbstractMolecular sieves, are attractive materials for discriminating chemical sensors. These microporous metal oxides offer shape selective adsorption as well as chemical and thermal stability. Molecular sieves have shown promise in SAW devices, however, these sensors rely only on a weight change upon adsorption of target molecules. We have developed a molecular sieve based capacitance type chemical sensor. Such a device should discriminate between molecules of similar size and shape because the signature change depends on the polarity of the adsorbate which in turn affects the dielectric properties of the molecular sieve. In this paper we describe the deposition of AIPO4 and MeAPO molecular sieve thin films on titanium nitride coated silicon wafers by laser ablation. A subsequent hydrothermal treatment followed by a Pd/Au coating and standard microlithography techniques generate the capacitors. The results for capacitance measurements in the presence of CO2, CO, NO, N2, O2, H2O and toluene indicate clear differences in selectivity between small, medium and large pore molecular sieves.

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