The Effect of Phosphatation and Granulation Zeolite in the Adsorption of Cr(VI)

Abstract

This research was aimed to study the effect of contact time on adsorption of Cr(VI) using Granules Alumino Silico Phosphate (GASP) and to determine the adsorption capacity of GASP. The GASP synthesis process was carried out in several main stages: 1) activation of zeolite with addition 0.4 M HCl, 2) Zeolite phosphatation by addition of NH 4 H 2 PO 4 ratio Si/P = 1/6 at 235ᴼC for 5 hours, 3) Granulation of phosphated zeolite using chitosan to afford the GASP. The GASP was characterized using XRF, FT-IR and SAA. The contact time effects was tested using 0.1 g of GASP in K 2 CrO 4 100 mg/L and the contact time variation of 0.5; 1.0; 1.5; 2.0 and 2.5 hours. The result of the research showed that the optimum contact time occurred for 2 hours. The concentration effect on adsorption capacity was tested out using 0.1 g of GASP in K 2 CrO 4 and the concentration variation of 25, 50, 75, 100 and 150 mg/L for 2 hours. The adsorption capacity can be determined using the Langmuir equation. XRF characterization results showed an emergence of P 2 O 5 34.70 % and decrease in SiO 2 levels of 18.10% and Al 2 O 3 by 2.2% after phosphatation process. The result of characterization by FTIR indicated the success of the phosphatation process as evidenced by the shift of wavenumber to the lower region of tetrahedral silica and alumina uptake was shifted to wavenumber the region of tetrahedral phosphate uptake in accordance with Hooke's law. Characterization results by SAA showed increased surface area, pore volume and pore count after phosphatation process. The concentration variation was directly proportional to the increase of the adsorbed Cr(VI) mass. The presence of phosphatation and granulation process can increase the value of adsorption capacity by 48.077 mg/g on GASP rather than 15.601 mg/g on active zeolite

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