Influence of the activation method of agro-industrial wastes in the removal of lead

GIMENEZ, MARIANELA; SARDELLA, FABIANA; DEIANA, CRISTINA; SAPAG, KARIM

DESALINATION AND WATER TREATMENT

EDS

Lugar: Rome; Año: 2018 vol. 108 p. 223 - 234

The adsorption on activated carbon has been shown to be very effective for the removal of heavy metalsfrom water. This work details the removal of lead by adsorption onto activated carbon obtainedfrom wastes of grape industrialization, in batch and column operation, under different conditions inorder to correlate the adsorbents properties with their performance. Activated carbons, obtained fromgrape lex and grape stalk by physical and chemical activation, were characterized by Brunauer, Emmetand Teller (BET) surface area, pore volumes, point of zero charge pH and surface functional groupsthrough Boehm method, Fourier transform infrared spectroscopy and temperature programmeddecomposition. The results showed better textural properties for the adsorbents obtained by chemicalactivation, whose BET areas were 978 and 1,217 m2 g?1. Chemical characterization also showed amarked difference between both activation routes, yielding carbons with a marked basic character byphysical activation and acid by the other way. Due to their dissimilar textural and chemical properties,all products exhibited different performance in batch and continuous assays. The maximum adsorptioncapacity was 49.95 mg g?1, achieved at a bed height of 15 cm and a feed concentration of 100 mg L?1using steam activated grape lex briquettes as adsorbent.