Uklanjanje CrO4 aniona iz vode prirodnim i modificiranim zeolitom

Keletić, Marko (2008) Uklanjanje CrO4 aniona iz vode prirodnim i modificiranim zeolitom. Diploma work - Pre-Bologna programme. Grafički fakultet. [Mentor: Rožić, Mirela].

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Abstract

Ispitana je adsorpcija kromatnog aniona (CrO42-) na klinoptilolitom bogatom tufu modificiranog s kvarternim surfaktantom heksadeciltrimetil amonijevim bromidom (HDTMA+Br-). Na negativno nabijenu površinu klinoptilolita, HDTMA+ kationi adsorbiraju se jakim Coulombovim (ionskim) vezama. Dok je prvi sloj surfaktanta vezan kationskom izmjenom, drugi sloj je vezan hidrofobnim interakcijama i stabiliziran protuionima (Br- ioni). Promjena zeta potencijala od negativnog na pozitivni mijenja prirodu zeolita koji poprima svojstva anionskog izmjenjivača. U otopini koncentracije 19,02 mg CrO42-/l na uzorak organo-zeolita s dvoslojnom konfiguracijom HDTMA+ iona, adsorbiralo se 1,44 mg CrO42-/g zeolita (75,5%), a u otopini koncentracije 107,8 mg CrO42-/l adsorbiralo se 2,74 mg CrO42-/g zeolita (25,4%). Na uzorcima na čijim je vanjskim površinama adsorbiran samo monosloj HDTMA+ kationa najvjerojatniji mehanizam adsorpcije kromatnih aniona je površinsko taloženje HDTMA-CrO42- kompleksa.

Item Type:	Diploma work - Pre-Bologna programme
Mentor name:	Rožić, Mirela
Defence date:	July 2008
Abstract in english:	The chromium anion (CrO42-) adsorption behavior on modified clinoptilolite-rich tuff was investigated. Tuff was modified with the quaternary surfactant hexadecyltrimethyl ammonium bromide (HDTMA+Br-). Cations adsorb on negatively charged clinoptilolite surface by Coulomb (ionic) bonds. While the first surfactant layer is engaged in cation exchange, second layer is engaged in hydrophobic interactions and stabilized by Br- ions. Changing zeta potential from negative to positive changes the nature of zeolite, which becomes an ion exchanger. On organozeolite sample with two-layer configuration of HDTMA+ ions, 1,44 mg CrO42-/g of zeolite was adsorbed from the solution containing 19,02 mg CrO42-/l, which is 75,5% 2,74 mg CrO42-/g of zeolite (25,4%) was adsorbed from the solution containing 107,8 mg CrO42-/l (25,4%). The most probable mechanism of adsorption for chromate ions for samples on which outer surface only HDTMA+ cation layer was adsorbed, is the surface sedimentation of HDTMA-CrO42- complex.
Uncontrolled Keywords:	ekologija, voda, klinoptilolit, surfaktant
Keywords in english:	ecology, water, clinoptilolite, surfactant
Subjects:	TECHNICAL SCIENCES > Graphic Technology
Institution:	Grafički fakultet
City:	Zagreb
Number of Pages:	45
Callnumber:	rož 2008 kel
Inventory number:	D596
Status:	Unpublished
Date Deposited:	15 Nov 2013 21:33
Last Modified:	22 May 2014 08:01
URI:	http://eprints.grf.unizg.hr/id/eprint/578

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