Produção e avaliação de bioadsorventes obtidos da torta de mamona para remoção de íons cobre em solução aquosa.

Abstract

The metal pollution has become an environmental problem due to the increase of human activities. The use of agro-industrial wastes as adsorbent material is quite interesting because of its abundance and low cost, making it a promising alternative to existing technologies. Because of the castor bean is an important co-product and the potential increase in domestic production because of the demand for biodiesel, it is necessary to add it greatest value with new products. This work deals with the study of characterization, development and application of adsorbent basis of castor bien pie in the process of removal of copper ions in aqueous solutions. Treatments obtained from the pie with a diameter 0,5 mm were characterized for surface area, functional groups, elemental composition and particle diameter. For studies of the kinetics of biosorption of Cu2+ ion were used to sample fresh (IN) and treatment TM-500-90, conducted in camera with orbital agitation. The empirical kinetic models used were the pseudo-first and pseudo-second order. The castor bean obtained in press labmade showed 15,10% of oil and 41,06% protein. The area of treatment TM-500-90 for IN was 74 times greater. In infrared analysis showed the disappearance of absorption and retention of intensities in the region from 2450 to 2270 cm-1 for IN and other treatments. In elemental analysis was C increase in temperatures below 500ºC, but high mass reduction in temperature of 30 to 90 minutes of roasting. The N content increased in all treatments with the temperature and time. The levels of H and S were not to show systematic behavior pattern. However, H and S were reduced as the heat treatment. The average diameter of particles for IN was 544,60 μm and TM-500-90 of 226,70 micrometers. The kinetics study for IN and TM-500-90 showed that the equilibrium is reached in 15 minutes and is suitable for the type of pseudo-second order. The adsorption capacities for the maximum time of 240 minutes were 2,24 mg / g for the treatment IN and 2,47 mg / g for TM-500-90. The removal of Cu2+ ions at this time was 89,9% for IN and 98.9 for TM 500-90.