Abstract
In this work, we prepared activated carbon (AC) from rice husks using chemical activation with NaOH and combined with ultrasound. The resulting product was analyzed with thermogravimetry (TGA), X-Ray Diffractometry (XRD), scanning Electron Microscopy (SEM), and energy-dispersive X-ray (EDX) techniques. The nitrogen adsorption-desorption was used for determining the material’s surface area (Brunauer – Emmett – Teller, BET). The material possesses an amorphous carbon structure, and the pyrolysis occurs at around 450 °C. The ACs exhibit a well-developed porous structure with different pore sizes, and the maximum surface area of about 1673 m2·g–1 was obtained from the sample prepared over 30 min with ultrasound (AC30). Langmuir isotherm models were applied to describe the adsorption isotherm of Cr(III) and Pb(II) on AC30. AC30 is a promising adsorbent for removing metal ions with a maximum adsorption capacity of 23.1 mg·g–1 for Cr(III) and 41.5 mg·g–1 for Pb(II).
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