Original Articles
Suyanto
Abstract
In this research chitosan was grafting with chloroacetic acid and it was cross-linking with urea-oxalic acid to form carboxymethyl-urea-oxalic acid (CMChi-UOX). The CMChi-UOX was blending with silica gel, to form blend Silica gel-carboxy methyl-urea-oxalic acid (Si-CMChi-UOX). Adsorption-fluidization Cr(VI) ions from artificial waste water were carried out in fluidized bed. The fluidized bed was filled with 200 ml artificial waste water and added amount 0.5 gram of adsorbent. The variable in this research are variety of times, temperatures and pH. The adsorption-fluidization capacity of CMChi-UOX and Si-CMChi-UOX onto Cr(VI) ions respectively were written in percent, 93.32% and 94.95% respectively, or the standard can be written as mg adsorbate/g adsorbent, 37.33 and 37.98 respectively. The order rate of adsorption-fluidization for CMChi-UOX to Cr(VI)ions is order 1 and order 2, whereas the process of adsorption-fluidization is spontaneous. The parameter thermodynamics are ΔH= 468.8347 J mol-1adsorbate, ΔG = 1.2913 J mol-1, ΔS=1.3631 J mol -1K-1 and the process adsorption-fluidization was following Freundlich isotherm.