ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

The sorption of methylene blue and methylene violet on the variously processed Fintice bentonite

S. Mocik

Komenský University, Bratislava

Abstract: The effect of some acids and Na salts on the modification of bentonite from Fintice and its sorption of methylene blue at 520 mμ and of methylene violet at 470 mμ was described. The liberation of Al³⁺, Fe³⁺, Ca²⁺, and Mg²⁺ was obsd. The sorption capacity increases starting from 30% H₂SO_4, it has max. at 20% H₃PO₄ and min. at 60%, and it is assocd. with a sharp decrease of Al³⁺. With HCl, the sorption capacity varies greatly, showing a sharp decrease at 5-10% and it is unchanged at 15-30%. The sorption capacity is assocd, with a great decrease of Al³⁺, while Fe³⁺, Ca²⁺, and Mg²⁺ are unchanged. Of the Na salts, Na₂Cr₂O₇.H₂O, NaClO₃, Na₂CO₃, NaCl, Na₂SO₄, NaH₂PO₄.2H₂O, and NaOAc.3H₂O were tested. NaOAc.3H₂O showed the highest and NaCl lowest sorption capacity. With increasing pH the sorption capacity was increased in water suspensions of bentonite.

Full paper in Portable Document Format: 1810a777.pdf (in Slovak)

Chemical Papers 18 (10) 777–782 (1964)