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TREATMENT OF SOME PERSISTENT ORGANIC POLLUTANTS WITH CHEMICALLY MODIFIED SMECTITES


BUCISCANU INGRID 1 *, MAIER STELIAN-SERGIU 1, DESELNICU VIORICA 2
(1)„GH. ASACHI” TECHNICAL UNIVERSITY, 700050, BLVD. D. MANGERON 67, IAŞI, ROMANIA, TEL. 0040232279850, *E-MAIL: IIACOMI@CH.TUIAŞI.RO (2)LEATHER AND FOOTWEAR RESEARCH INSTITUTE, 93 ION MINULESCU STREET, 74259, BUCHAREST, ROMANIA

Issue:

SCSCC6, Volume VII, No. 2

Section:

Volume VII - No. 2 (2006)

Abstract:

Some nanoparticulated sorbents, known in the specialty literature and practical use as organoclays were prepared, based on native sodium smectite modified with some quaternary ammonium cations – hexadecyltrimethylammonium (HDTMA), N-cetylpyridinium (NCPy), dimethyldioctadecylammonium (DDA) and alkylbenzyldimethylammonium (ABDMA) – through a ion exchange reaction. The products were characterized by means of sorption isotherms over a range of 0 ÷ 250% satisfaction degree of the cation exchange capacity (CEC), by desorption tests and by TG analysis. Adsorptive properties were assessed by means of sorption isotherms towards several nonionic surfactants (NISs): two nonylphenol ethoxylates: NPEO8 and NPEO12 and one fatty alcohol ethoxylate with 10 ethoxy groups, EUSAPON OD. The HDTMA and NCPy-organoclays were effective adsorbents for both nonylphenol and fatty alcohol ethoxylates, with high sorption limits. The DDA-organoclay showed significantly lower sorption limits.The ABDMA proved to be inactive towards the nonionic surfactants.

Keywords:

organoclays, adsorbents, nonionic surfactants, wastewater.

Code [ID]:

CSCC6200607V02S01A0017 [0001103]

Full paper:

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