ADSORPTION BEHAVIOR OF PHOSPHATE BY MONTMORILLONITE

Hanesdy , Setiawan (2011) ADSORPTION BEHAVIOR OF PHOSPHATE BY MONTMORILLONITE. S1 thesis, UNY.

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Abstract

This study aims at determining the patterns of phosphate ion adsorption by montmorillonite clay minerals and the reaction of phosphate ion adsorption by montmorillonite clay minerals. The research subject was montmorillonite clay minerals and the object of this study was the patterns of phosphate adsorption by montmorillonite clay minerals. The montmorillonite used was first saturated with Ca2+ ion from 0.05 M of Ca (N03)2. Determination of adsorption patterns was based on the kinetics experiments of adsorption, desorption, adsorption edge, and adsorption isotherm. Determination of adsorption reaction was on the basis of potentiometric titration experiments. Kinetics of adsorption and desorption was made to the montmorillonite suspension containing 0.0001 M of KH2POq with supporting electrolyte of Ca(NO)2 of 0.001 M in spans of 1 minute to 2 days. Adsorption edges were conducted on montmorillonite suspension containing 0.0001 M of KH2POq with supporting electrolyte of Ca (N03)2 of 0.001 M in the pH ranges of 3 to 10. Adsorption isotherms were conducted on montmorillonite suspension containing supporting electrolyte of Ca (N03)2 of 0.001 M with the addition of KH2POq volume of 0.01 M from 1 to 8 mL. Potentiometric titration was carried out on a single system of montmorillonite suspension or KH2P04 solution of 0.001 M with the supporting electrolyte of Ca (N03)2 of 0.001 M. The titration was done by raising the pH of the system to about 10 with the addition of 0.1 M of KOH and then the pH was lowered to about 3 with the addition of 0.1 M of HN03. Potentiometric titration data were then modeled using computer software named GRFIT to determine the equilibrium constant prices and the distribution of speciation that had been formed. The optimum time of phosphate adsorption by montmorillonite was 20 minutes. The optimum adsorption occurred at pH 6.5. The adsorption pattern occurring was multilayer with maximum adsorption power to monolayer of 6.27 x 10-7 moUm2. Adsorption reaction mostly occurred on the external surface and a small portion occurred at the interface surface. On the external surface, adsorption reactions that occurred on the edge site and face site were SOH2+ HPOq2 "~ (SOH2...HPOq)" 2XH HPOq2 ~ (XH) 2HP04. At the interface surface, adsorption reactions that occurred were X "... H20...Ca2+ + HZPO4. ~ X "... H20...H2P04 + Ca 2+.

Item Type:	Thesis (S1)
Subjects:	Matematika dan Ilmu Pengetahuan Alam > Kimia
Divisions:	Fakultas Matematika dan Ilmu Pengetahuan Alam (FMIPA) > Jurusan Pendidikan Kimia > Kimia
Depositing User:	Eprints
Date Deposited:	10 Aug 2012 05:50
Last Modified:	29 Jan 2019 15:49
URI:	http://eprints.uny.ac.id/id/eprint/3932

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