Rubio A., Zanette Da Silva I., Gasparotto F., Paccola E., Silva C., Ueda Yamaguchi N., Emanuelli Picada I., Bergamasco R., 2018, Removal of Methylene Blue Using Cassava Bark Residue, Chemical Engineering Transactions, 65, 751-756.
Dyes are used in several industrial sectors; the methylene blue, specifically, is often used in manufacture of paper and other materials such as nylons and polyesters. Given this, many researches related to the treatment of these effluents frequently appear. A process widely used in the treatment of industrial wastewater involving dyes is the adsorption. It presents high efficiency and does not require high initial investments. In order to reduce the costs of the adsorption process, biomasses can be used as adsorbent materials. Cassava is a crop of easy adaptation, being cultivated in all states of Brazil. In this research the ability of cassava bark residue (CBR) to remove methylene blue from aqueous solution was evaluated. Its physical characteristics were studied by scanning electron microscope (SEM) and potential zeta analysis. Methylene blue biosorption studies were performed in batch experiments, isothermally at 25 °C. The contact time was determined by the study of kinetics of the process. It was also performed an acid and alkaline treatment to improve methylene blue removal in aqueous solution. Biosorption of methylene blue using CBR with alkaline modification presented 97.99% removal after 24 h. The use of the CBR was confirmed as a good biosorbent for methylene blue removal, and could be considered as a new alternative for the treatment of wastewater, presenting an application for the destination of residue of manioc bark.
