Toeti Koestiari
The objective of this research was to determine the Bentonite-Signa (B-S) and pillaring Al bentonite (B-Al/400oC) characters that can be used to adsorb Mg2+ ions. Laboratory experimental study consist of two stages, characterization phase of B-S and B-Al using Spectrophotometer IR Buck Scientific - 500, X-Ray Diffraction X'PERT Phillips, Gas Sorption Analyzer Quantachrome NovaWin2, Scanning Electron Microscope, and Atomic Absorption Spectrometer (AAS) Perkin Elmer AA-100 to showed adsoption capacity for two adsorbens. The result of this research showed: 1). B-S and B-Al have different of interlayer as 12,4374 A (B-S) and 9,3047 A (B-Al); surface area 24,78 m2/g (B-S) and 217,021 m2/g; total pore volume of radii which smaller than 1001,9 A (B-S) and 1273,1 A (B-Al), respectively. 2) The difference in the number of active sites of two adsorbents, cause the adsorption capacity of B-S is greater than that of B - Al. 3). At the system of pH 5, 6, 7, and 9 the adsorption capacities of B-S is greater than B-Al for Mg2+, respectively.
Chemistry Department, FMIPA Universitas Negeri Surabaya, Indonesia
