Obtención de nanofibras de celulosa a partir del raquis de banano aplicado a la remoción de azul de metileno

Abstract

The concern about the finding sustainable materials, as well as the searching for alternatives to reduce the contamination of aquatic systems has taken on great importance in recent times. The present work of research focuses on obtaining cellulose nanofibers (CNF) from agricultural waste, banana rachis, to be applied as adsorbent material for methylene blue (AM). To obtain CNFs, the application of various physical-chemical and biological extraction methods was carried out, including (i) steam explosion, (ii) chemical treatment, (iii) biological retting. The obtained nanofibers were identified as: CNF1, which consists of the combination of the three methods (biological retting, steam explosion and chemical treatment), CNF2 deals with the application of two methods (steam explosion and chemical treatment), CNF3, for the chemical treatment method and CNF4, (biological retting methods plus chemical treatment). The characterization of the material was evaluated by determining the pH of zero charge potential (pHpzc) and the evaluation of the adsorption efficiency of AM. An analysis of variance (ANOVA) was performed in order to determine significant differences and establish the most optimal adsorbent material for AM adsorption. The pHpzc potential study reflects that at pH 8 the CNF3 adsorbent material has a greater capacity to attract positive ions, resulting in benefits for the adsorption of AM, consequently the CNF3 material presented the best removal of 65.42%.