Document Detail


Titanium(IV) tungstosilicate and titanium(IV) tungstophosphate: two new inorganic ion exchangers.
MedLine Citation:
PMID:  12613807     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Crystalline phases of Ti(IV) tungstosilicate and Ti(IV) tungstophosphate have been synthesised. The ion-exchange capacities of Ti(IV) tungstosilicate and Ti(IV) tungstophosphate have been reported as 0.44 and 0.80 mequiv./g, respectively. Both materials show monofunctional ion-exchange characteristic and are stable in 0.1 M solutions of HNO3, HCl, H2SO4 and acetone and benzene. Ti(IV) tungstosilicate is found to be more stable thermally than Ti(IV) tungstophosphate (loss in ion-exchange capacity was found as 58 and 80%, respectively for samples heated at 200 degrees C). The Kd values for heavy metals such as Pb, Hg, Cd, Sb, Co, Zn, Ni, Fe, Cr etc. have been reported in demineralised water and two surfactant media by batch processes. Cr3+, Fe3+ and Sn4+ are totally adsorbed on both the materials in demineralised water while a decrease in Kd value with increase in concentration of two surfactants is reported. On the basis of Kd values for metal ions, thirteen binary separations and five ternary separations on Ti(IV) tungstosilicate and thirteen different binary separations and four different ternary separations on Ti(IV) tungstophosphate have been achieved. Separation of methylamine from ethylamine has been done by GC on a column packed with Ti(IV) tungstophosphate.
Authors:
Zia Mahmood Siddiqi; Deepak Pathania
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of chromatography. A     Volume:  987     ISSN:  0021-9673     ISO Abbreviation:  J Chromatogr A     Publication Date:  2003 Feb 
Date Detail:
Created Date:  2003-03-04     Completed Date:  2003-10-07     Revised Date:  2009-01-15    
Medline Journal Info:
Nlm Unique ID:  9318488     Medline TA:  J Chromatogr A     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  147-58     Citation Subset:  IM    
Affiliation:
Department of Applied Chemistry, Regional Engineering College, Jalandhar-144011, Panjab, India. siddiqizm@lycos.com
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MeSH Terms
Descriptor/Qualifier:
Ion Exchange Resins*
Microscopy, Electron, Scanning
Spectrophotometry, Infrared
Titanium / chemistry*
Tungsten / chemistry*
Chemical
Reg. No./Substance:
0/Ion Exchange Resins; 7440-32-6/Titanium; 7440-33-7/Tungsten

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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