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


Basoglu F. T. , Balci S.

APPLIED CLAY SCIENCE, cilt.50, ss.73-80, 2010 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 50 Konu: 1
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1016/j.clay.2010.07.004
  • Dergi Adı: APPLIED CLAY SCIENCE
  • Sayfa Sayıları: ss.73-80

Özet

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.