Adsorption mechanism of chromium(III) using biosorbents of Jatropha curcas L.

作者：Goncalves Affonso Celso Jr^*; Nacke Herbert; Schwantes Daniel; Campagnolo Marcelo Angelo; Miola Alisson Junior; Teixeira Tarley Cesar Ricardo; Dragunski Douglas Cardoso; Cajamarca Suquila Fabio Antonio

来源：Environmental Science and Pollution Research, 2017, 24(27): 21778-21790.

DOI：10.1007/s11356-017-9749-z

• Agro-industrial wastes
• Natural adsorbents
• Recuperation of water sources
• Chromium

The removal of Cr3+ from water solutions by biosorbents from the rind, endosperm, and endosperm + episperm of the Jatropha curcas was evaluated. Adsorption tests were performed in batch systems for evaluating the influence of the solution's pH, adsorbent mass, contact time, initial Cr3+ concentrations, and solution temperature during the adsorption process. Kinetic, adsorption isotherm, and thermodynamic studies were performed to investigate the mechanisms that control adsorption. Ideal conditions for the adsorption process included pH of the solution of 5.5 and 8 g L-1 adsorbent mass, within 60 min time contact between adsorbent and adsorbate. Maximum adsorption capacities by Langmuir model for rind, endosperm, and endosperm + episperm of the J. curcas were, respectively, 22.11, 18.20, and 22.88 mg g(-1), with the occurrence of chemosorption in mono and multilayers. Results show that the biosorbents obtained from J. curcas have a high potential to recuperate Cr3+ from contaminated water sources.

• 出版日期2017-9