UTILIZATION OF EXPERIMENTAL DESIGN FOR SPECIFIC SURFACE AREA OPTIMIZATION OF A PILLARED BENTONITE

Ana-Maria GEORGESCU, Gheorghe BRABIE, Ileana Denisa NISTOR, Françoise NARDOU, Claude PENOT

Abstract

Statistically designed experiments were used to study the effects of relevant factors, such as calcination  temperature and  duration,  in  obtaining  of  Al-pillared  clays  with  a  high  specific  surface area. Experiments have been planned by the factorial 32 design methods. The optimal  conditions to obtain  the  maximum  specific  surface  area  of  Al-pillared  bentonite  were  deduced  as  follows: calcination temperature 326°C and calcination duration 63 min, for a specific surface area of 152.49 m2/g. The results from BET (Brunauer-Emmett-Teller) method showed that the pillared smectite clay possesses a specific surface area up to 155.65 m2/g. Besides, chemical treatment of smectite clay by pillaring  process  produces  an  adsorbent  with  optimal  porosity  and  other  adsorption  properties suitable for many industrial processes.

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