Print version ISSN 0100-4042
SANTOS, Vanessa Cristina Gonçalves Dos et al. Highly improved chromium (III) uptake capacity in modified sugarcane bagasse using different chemical treatments. Quím. Nova [online]. 2012, vol.35, n.8, pp. 1606-1611. ISSN 0100-4042. http://dx.doi.org/10.1590/S0100-40422012000800021.
The present paper focuses on improving chromium (III) uptake capacity of sugarcane bagasse through its chemical modification with citric acid and/or sodium hydroxide. The chemical modifications were confirmed by infrared spectroscopy, with an evident peak observed at 1730 cm-1, attributed to carbonyl groups. Equilibrium was reached after 24 h, and the kinetics followed the pseudo-second-order model. The highest chromium (III) maximum adsorption capacity (MAC) value was found when using sugarcane bagasse modified with sodium hydroxide and citric acid (58.00 mg g-1) giving a MAC value about three times greater (20.34 mg g-1) than for raw sugarcane bagasse.
Keywords : biosorption; chromium; sugarcane bagasse.