Abstract
The expanded perlite was studied as adsorbent for removing of Cu2+ ion from contaminated water. The test conditions were following: pH = 2 – 11; a perlite dosage 0,1 – 1 g; ratio solution: sorbent = 20 – 500 ml : 1 g; basic concentration of the Cu2+ ions 0,5 and 5 mg.1-1, laboratory temperature. The results showed that the perlite shifts the pH value of solutions which have the pH in region of 4 – 9 to neutral region 6 – 7. The pH value of solution was adjusted by HCl/NaOH and McIlvaine (citric acid/Na2HPO4); and Sőrensen (Na2HPO4/KH2PO4) buffer. Top-tests were carried out with solution adjusted by HCl/NaOH. The removing of Cu2+ ions from water relates with the basicity of aqueous solutions. If the ratio of perlite to solution with Cu2+ concentration of 5 mg.l-1 is 1 g : < 40 ml the removal of Cu2+ ions from solution rapidly increases in interval of pH from 4,5 to 5,5 and at pH ³ 6 achieves a maximum. The removal of the Cu2+ ions from initial solution (5 mg.1-1 of Cu2+) is 90 – 95 % at an exposition time of 180 min. and pH > 6. The values from desorption test were about 25 – 30 % lower. The purpose of this paper was to show the influence of phosphate and citrate anions in aqueous solutions on removing of Cu2+ ions from diluted water solution, too. The results confirmed that the citrate anions in the McIlvaine buffer inhibit sorption of Cu2+ on perlite while phosphate anions in Sőrensen buffer generate conditions for formation of Cu2+ precipitates.
Highlights
Perlite is a hydrated glassy volcanic rock of the chemical composition: 71 – 75 % SiO2, 12,5 – 18 % Al2O3, 4 – 5 % K2O, 1 – 4 % Na2O + CaO with 2 – 5 % water content
HCl/NaOH without perlite, - solution adjusted by HCl/NaOH with perlite addition, ∆ - solution adjusted by buffer (C6H8O7, Na2HPO4) with perlite addition p-ISSN 1335-1532 e-ISSN 1338-1156
The pH value of passing water depends on velocity of alkali leaching form perlite as well as on water flow
Summary
Perlite is a hydrated glassy volcanic rock of the chemical composition: 71 – 75 % SiO2, 12,5 – 18 % Al2O3, 4 – 5 % K2O, 1 – 4 % Na2O + CaO with 2 – 5 % water content. The expanded perlite is light, chemically and thermally stable material. The powdery density and the specific surface of expanded perlite is 80 – 250 kg.m-3 and 1,7 – 2,1 m2.g-1. For these properties perlite is used as fireproof insulating material, sorbent of oil, filter material and vitrificator [1,2,3,4,5,6,7]. Different raw materials on carbonate and aluminosilicate base can be used to elimination of heavy metals from contaminated water [8,9,10,11,12,13]. Perlite is considered a suitable sorbent and immobilizer of metal cations, nanoparticles and microorganisms [10,11,12,13,14,15,16,17,18,19]
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