Characterization of annatto(bixa orellana)peels activated carbon and its application as adsorbent for natural dyes from annatto seeds

摘要

This study aims to fabricated activated carbon from annatto(B.orellana)peels and to apply that as a natural dyes adsorbent from annatto seeds.The fabrication process methods through the physical and chemical activation.The study of adsorption includes the adsorption kinetics and isotherms of natural dyes from annatto seeds using annatto peels activated carbon(APAC).The amount of natural dyes adsorption measured using UV-Vis spectrophotometer with the calculation of impairment of absorbance value.The APAC can be generated from the carbonization process at 400°C for an hour and two-stage activation process(physical and chemical activation)with H3PO4 30% as an activator and the impregnation ratio of 1:4(w/w)for 24 hours.The APAC has characteristics such as standard activated carbon based on analysis with FTIR spectrophotometer and X-ray Diffractometer.The peak of APAC diffraction was detected at 2theta = 24.081° and 42.858°.The adsorption kinetics of ACAP on annatto seeds extract(ASE)followed the pseudo second-order kinetic model with the rate constant of adsorption is 78.5514 g mg~(-1)h~(-1)on 150 minutes for contact time.This adsorption process followed the Elovic isotherm models with multilayer adsorption.