Parameters optimization of acid activated bentonite clay from the coal mine 'Bogovina'

Abstract

The bentonite clays, depending on the type of activation, are used as an adsorption media, as the starting material for the catalyst's supports, in the water purification processing plants, in the storage processing of nuclear wastes, as the encapsulates in the pharmaceutical industry, for the medical purposes, in the casting industry, as the media for geological drilling and for other purposes. The characteristics of raw bentonite clays (from the coal mine "Bogovina", Bogovina), as well as the characteristics of acid activated clays are shown in this paper. The influence of activation time, activation temperature and acid concentration are investigated in the scope of textural properties of activated samples. The parameters optimization of the acid activation process is performed. The sample activated under optimal conditions have pores size distribution in the region of mezopores and specific surfaces area of 290m2/g. Those properties ensure good adsorption behaviour of the activated bentonite clays.

Bentonitne gline, u zavisnosti od tipa aktivacije, upotrebljavaju se kao adsorbensi organskih materija, kao polazna sirovina za nosače katalizatora, u procesima prečišćavanja vode, pri skladištenju radioaktivnog otpada, kao punioci u farmaceutskoj industriji, u medicinske svrhe, u livarskoj industriji, pri geološkom bušenju i dr. U ovom radu su prikazane karakteristike sirovih bentonitnih glina sa nalazišta RMU Bogovina, i kiselinsko aktiviranih produkata. Ispitivan je uticaj vremena aktivacije temperature i koncentracije kiseline na teksturalna svojstva aktiviranih uzoraka i izvršena optimizacija parametara procesa. Uzorak dobijen aktivacijom pri optimalnim uslovima, ima uniformnu raspodelu pora po prečnicima pora, sa najvećim udelom mezopora i specifičnom površinom od 290 m2/g, što mu obezbeđuje dobra adsorpciona svojstva.