Mechanical conversion of cellulose into nanocellulose as dye adsorbent and stain resistant coating
Loading...
Date
2019-06
Authors
Nor Syahira Binti Abdullah
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Dyes are widely used in various industries such as textiles, paper, printing, plastics, food, cosmetic and etc. Approximately 15 % of the dyes remains as industrial waste and are discharged into water bodies and can caused serious environmental problem. Physical separation methods, especially sorption of synthetic dyes on inexpensive nanomaterials have been considered a simple and economical process for the removal of dyes from wastewater. A large surface area and the abundance of adsorption sites are essential for adsorption and removal of contaminants from wastewater. By tuning the surface chemistry, nanomaterials can be also converted into stain resistant coating to reduce dye stain on different unit operations. It helps to reduce cleaning and water footprint of dye processing units. In this research, cellulose is converted into nanocellulose with mechanical processing by a high-speed blender. The aim of this research is to study the effects of mechanical treatment on the dye adsorption and repellent properties of cellulose. The optimum duration of mechanical treatment was found to be 30 min at 7k rpm with cooling time intervals about 5 to 15minutes based on methylene blue (MB) adsorption. The adsorption equilibrium of MB on nanocellulose is be well represented by Freundlich isotherm, indicating multilayer adsorption. The kinetic studies showed that MB adsorption on nanocellulose fits pseudo-second order kinetic models. Using hydrophobic silane, nanocellulose could be further converted into stain resistant coating with water contact angle higher than 100°.