Adsorption of Pb2+ by heat-treated and sulfurized activated carbon

✍ Scribed by A. Macías-García; C. Valenzuela-Calahorro; V. Gómez-Serrano; A. Espínosa-Mansilla

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 753 KB
• Volume: 31
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(93)90083-m

✦ Synopsis

Using activated carbon (AC) and samples obtained by heat and sulfurizing treatments of the material, the adsorption of Pb*+ from aqueous solution was studied at two pH values and at three temperatures in the range 2%45°C. Adsorbents were prepared either by heat treatment of AC from 30 to 900°C in Nr or HrS, or by treatment of the material first at 30°C successively in SOr and HrS, and then at 200°C in N,. Their characterization was in terms oftextural properties and surface chemistry. Techniques used were gas adsorption (Nr, -196"C), mercury porosimetry, density measurements (He, 3O"C), and FT-IR spectroscopy. The treatments effected on AC originated a great increase in the adsorption of Pbr', but only when it occurred from solutions of metallic ion at unchanged pH and at 25°C. Adsorption decreased strongly by pH and temperature variations, except for AC. The adsorption rate depended on the adsorbent, pH, and temperature.