Development of Cellulose-Based Adsorbent for Boron Recovery from Water Resources
Boron is an essential nutrient for living beings, also, its compounds used widely in many chemical industries. The excessive use of boron results in accumulation in water resources and due to the toxic nature of excess boron, it should be removed. Boron chemistry in aqueous solutions makes removal challenging, so, among possible removal methods, adsorption was found as one of the most promising removal methods. Upon reviewing adsorbents for boron removal, materials with n-methyl-d-glucamine (NMDG) moieties found as most used materials for this process. Due to high cost and synthetic nature of these materials, abundant natural materials such as cellulose can be utilized in the synthesis of boron removing adsorbents as organic, more environment friendly and cheap solution compared to their synthetic counterparts in the adsorbents, providing a sustainable adsorbent. Therefore, in this study, to remove boron from water sources, NMDG functionalized cellulose-based adsorbent which is boron selective was synthesized. Then, the characterization study comprising of FTIR, SEM, TGA was carried out and results show that the synthesis of boron selective cellulose-based adsorbent was successfully accomplished. Effective parameters such as pH and adsorbent dosage were investigated. Between pH values of 9.5-10, optimum adsorbent amount was found as 4 g/L, with boron removal greater than 99% in 10 ppm model boron solution. Lastly, a kinetic study was carried out and adsorbent showed pseudo-second order kinetics.
Keywords - Boron, boron adsorption, cellulose-based adsorbent, n-methyl-d-glucamine