Determination of Fluoride Biosorption From Aqueous Solutions Using Ziziphus Leaf As an Environmentally Friendly Cost Effective Biosorbent



Mahvi AH^{1, 2, 3} ; Dobaradaran S^{4, 5, 6} ; Saeedi R⁷ ; Mohammadi MJ⁸ ; Keshtkar M⁴ ; Hosseini A⁴ ; Moradi M⁴ ; Ghasemi FF⁴
Source: Fluoride Published:2018

Abstract

Biosorption is considered to be one of the favorite treatment technologies for fluoride ion (F) removal from aqueous solutions. The purpose of this study was to measure the efficiency of Ziziphus leaf in the removal of F from aqueous solutions. The biosorption experiments were performed in batch systems at room temperature. The experimental parameters studied were: (i) the initial F concentration level (3-12 mg/L), (ii) the biosorbent dose (1-10 g/L), and (iii) the contact time (5-120 min). The highest removal biosorption of 100% was observed at a biosorbent dose of 10 g/L, a contact time of 90 min, and an initial F concentration level of 12 mg/L. At an initial F concentration of 12 mg/L, the most effective and applicable biosorbent dose was 5 g/L which resulted in the removal of 95.36% of the F after 25 min with a resulting F concentration of 0.55 mg/L, which is safe for drinking water. The Langmuir model fitted better than the Frendlich model and showed a homogeneous biosorption surface with the possibility of a monolayer biosorption of F by the biosorbent. The biosorption kinetic was controlled by the pseudo-first-order model. The results showed that Ziziphus leaf can be used as an environmentally friendly, cost effective, and effective biosorbent for the removal of F from aqueous solutions. © 2018, ISFR.