Micro-mesopore analysis of Cu2+ and Ag+ containing Al-pillared bentonite

Basoglu F., Balci S.

APPLIED CLAY SCIENCE, vol.50, no.1, pp.73-80, 2010 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 50 Issue: 1
  • Publication Date: 2010
  • Doi Number: 10.1016/j.clay.2010.07.004
  • Journal Name: APPLIED CLAY SCIENCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.73-80
  • Keywords: Al-PILC, Copper, Silver, Characterization, Pore structure, SELECTIVE CATALYTIC-REDUCTION, WET PEROXIDE OXIDATION, CLAYS, ADSORPTION, MONTMORILLONITE, NO, ALUMINA, TEMPERATURE, PHENOL, COPPER
  • Gazi University Affiliated: Yes

Abstract

Copper impregnated Cu@Al-PILCs, silver impregnated Ag@Al-PILCs and copper aluminum mixed Cu/Al-PILCs were prepared using a bentonite sample from the Hancili region, Turkey. Incorporation of the Cu2+ or Ag+ ions forming CuO and Ag2O after calcination at 573 K decreased the basal spacing of 1.85 nm for Al-PILC by approximately 0.35 nm. The specific BET surface area and mesopore micropore volumes measured by 77 K nitrogen adsorption after calcination at 573 K decreased from 236 m(2) g(-1) and 0.174 cm(3) g(-1) to 174 m(2) g(-1) and 0.172 cm(3) g(-1) Cu2+ impregnation and 171 m(2) g(-1) and 0.168 cm(3) g(-1) Ag+ impregnation, while the values for Cu/Al-PILC were 209 m(2) g(-1) and 0.184 cm(3) g(-1). The micropore volume of all samples was about 20% of the total pore volume. The average Barrett-Joyner-Halenda (BJH) mesopore and Horvath-Kawazoe (HK) micropore dimensions were within 3.5-3.9 nm and 0.44-0.48 nm, respectively. Structural properties estimated from the Dubinin-Radushkevich (DR) method by using the nitrogen adsorption data were higher than those derived from the carbon dioxide adsorption data. SEM images indicated that Cu2+ incorporation increased the mesopore volume of the Al-PILC. (C) 2010 Elsevier B.V. All rights reserved.