Removal of As (V) from the aqueous solution by a modified granular ferric hydroxide adsorbent

• Published in: The Science of the total environment Vol. 706; p. 135947
• Main Authors: Pham, Thi Thuy, Ngo, Huu Hao, Tran, Van Son, Nguyen, Manh Khai
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.03.2020
• Subjects: Affecting factors; Arsenate; Characterization; Iron hydroxide-based adsorbent; Mechanism; Characterization; Iron hydroxide-based adsorbent; Arsenate; Affecting factors; Mechanism
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2019.135947

A novel adsorbent was prepared in granular form from iron (III) hydroxide and other additives to remove arsenate (As (V)) from aqueous solution. Adsorption of As (V) onto the adsorbent in batch experiments was analyzed to understand the adsorption mechanism, affecting factors, and adsorption isotherms. The optimal working conditions for the developed adsorbent were at pH 3, 30 °C and 50 g/L. The adsorption of arsenate onto the adsorbent occurred rapidly in the first 10 min and reached equilibrium in 2 h. The Langmuir isotherm was found to be best fitted the adsorption. The pre- and post-adsorption adsorbents were characterized by SEM, BET, FTIR, XRD, and Zeta potential techniques. Experimental results clearly demonstrated the potential impact of elemental composition, crystallinity, surface morphology, and other physico-chemical properties of the adsorbent on the adsorption performance variety. The experimental results with the pilot scale treatment system revealed that the adsorbent can be applied successfully and lead to a very efficient drinking water treatment system, at a competitive cost compared to the water market in Hanoi, Vietnam. [Display omitted] •Novel granular adsorbents were prepared from iron ore for As (V) removal.•The adsorbent was characterized in detail (morphology, chemical characteristics).•The influences are pH, initial concentration, contact time, dose and temperature.•As (V) removal mechanism by granular ferric hydroxide adsorbent was proposed.•The adsorbent can be applied for drinking water treatment at large scale.