PASTIC Dspace Repository

Partially Cd+ Ion-Exchanged Type-A Zeolites and Their Thermal Analysis

Show simple item record

dc.contributor.author SHER AKBAR
dc.contributor.author RUKHSANA SHAHNAZ
dc.contributor.author TAJAMUL HUSSAIN, SHAH
dc.contributor.author MUHAMMAD SAMI
dc.date.accessioned 2023-09-19T03:58:24Z
dc.date.available 2023-09-19T03:58:24Z
dc.date.issued 2009-08-20
dc.identifier.citation Akbar, S., Sami, M., Shahnaz, R., & Shah, T. H. (2009). Partially Cd/sup+ 2/ion exchanged type-a zeolites and their thermal analysis. Journal of the Chemical Society of Pakistan, 31(4), 543-551. en_US
dc.identifier.issn 0253-5106
dc.identifier.uri http://142.54.178.187:9060/xmlui/handle/123456789/19643
dc.description.abstract A series of partially exchanged Cd2+ A-zeolites (Cd0.86 A, Cd1.7 A, Cd2.46 A, Cd2.86 A, Cd3.25 A) were prepared by aqueous cation exchange technique from synthetic NaA-zeolite. The percentage of Cd2+ ions exchanged increased with decreasing the concentration of Cd2+ions and increasing temperature of the exchanging solution. This behaviour of Cd2+ ion exchange with concentration is attributed due to ‘volume effect,’ ‘salt imbibent’ and electroselectivity effect.’ The uptake of Cd2+ ions increased with rise in temperature indicated the process to be endothermic. Ion-exchange isotherms plotted at different temperatures showed the type ‘a’ isotherm i.e., the entering ion (Cd2+) indicated selectivity to the outgoing ions (Na+). The ion-exchange equilibrium data also followed the Freundlich and Langmuir adsorption isotherms. Thermogravimetric analysis (TGA) showed that the zeolitic water depends on the number of Na+ and Cd2+ ions per unit cell (p.u.c.) Thermal analysis curves showed that the minimum endothermic peak of dehydration slightly shifted towards higher temperature for CdA-zeolites indicated that water molecules are more strongly bonded to Cd2+ than Na+. Three exotherms were clearly observed within the temperature range 780-1000 °C, which are indicative of more than one reaction or crystallization of more phases. The differential thermal analysis (DTA) curves showed that dehydrated NaA zeolite retained its stability from 340 to 780 °C and CdNaA-zeolites from 330-380 °C to 800-820 °C, NaA amorphisized at 920°C and CdNaA-zeolite, from 920 to above 1000 °C. en_US
dc.description.sponsorship The chemical society of Pakistan is an approved society from the PSF. en_US
dc.language.iso en en_US
dc.publisher HEJ Research Institute of Chemistry, University of Karachi, Karachi. en_US
dc.title Partially Cd+ Ion-Exchanged Type-A Zeolites and Their Thermal Analysis en_US
dc.type Article en_US


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search DSpace


Advanced Search

Browse

My Account