Abstract

Makmur Sirait¹, Saharman Gea², Nurdin Bukit¹, Nurdin Siregar¹ and Ceria Sitorus¹

DOI : http://dx.doi.org/10.13005/ojc/3404020

The nanobentonite has been synthesized from natural bentonite taken from Tapanuli Utara, Indonesia using coprecipitation method with various solvents (HCl, H₂SO_4, and HNO₃). Its properties as a metal adsorbent were investigated by Atomic Adsorption Spectrophotometry. X-Ray Diffraction analysis revealed that the bentonite produced is in nanometer scale. The characterization results obtained from the SiO₂single phase with highest d_hkl was at millier index (101) with 2 of 21.9^o, 22.0^o,  22.07^o respectively. The results of Microscope-Scanning Electron Energy analysis of nanobentonite dispersion indicated a reduction in agglomeration and finer nanobentonite surface. The Surface Area Analyzer results showed the S_BET nanobentonite for solvent variation of HCL, H₂SO_4, and HNO₃ respectively were 731.76 m²/g, 868.11 m²/g, 493.97 m²/ g. Lastly, Atomic Adsorption Spectrophotometric test showed that the optimal absorption of the metal content possessed by variety of HCl and nanobentonites with adsorption power of 91.16% for Pb, 76.39% for Cu, and 82.74% Co.

Coprecipitation; Metal Adsorben; Nanobentonite; Various Solvent

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