Selenium and arsenic removal from water using amine sorbent, competitive adsorption and regeneration. (1st April 2021)

• Record Type: Journal Article
• Authors: Wei, Jinshan; Shen, Bo; Ye, Gan; Wen, Xianghua; Song, Yonghui; Wang, Jin; Meng, Xiaoguang
• Is Part Of: Environmental pollution. Volume 274(2021)
• Publication Date: 2021-04-01
• Subjects: Acrylic amine fiber -- Arsenic -- Selenium -- Competition adsorption -- Organic acid -- Adsorbent regeneration; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2020.115866
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: Selenium (Se) and arsenic (As) are toxic contaminants in surface water and drinking water. The human body needs little quantity of Se, but too high dose is not allowed. Metal oxides such as iron oxides were used for adsorption or co-precipitation removal of As from water. However, the regeneration and stability problems of metals oxides sorbents are unsatisfactory, and there is not enough adsorbent for Se removal from water also. We developed the acrylic amine fiber (AAF) for adsorption reomval of Se and As from water and systematically studied the influenced factors. Batch experiments were conducted for investigating the adsorption edges, while column filtration tests were employed for dynamic application edges. At neutral pH, the Langmuir isotherm fittings gave the maximum adsorption capacities of As(V), As(III), Se(VI) and Se(IV) are 270.3, 40.5, 256.4, and 158.7 mg/g, respectively. Effects of co-existing inorganic anions on As(V) and Se(VI) adsorption using AAF gave the order of PO4 3− > SO4 2− > NO3 − > SiO3 2−, while different organic acids obey the order of citric acid > oxalic acid > formic acid. Fourier transform infrared analysis showed the PO4 3− and SO4 2− competition mechanisms are electrostatic repulsions, while the competition of organic acids derived from acid-base reaction between the carboxyl group and the amino group. Column filtration and regeneration results showed that the spent AAF can be regenerated using 0.5 mol/L HCl solution and reused with no much decrease of adsorption capacity. Graphical abstract: Image 1 Highlights: The AAF showed capacities of 270.3 and 256.4 mg/g for As(V) and Se(VI), respectively. Effects of co-existing anions on As(V) and Se(VI) adsorption followed the order of PO4 3− > SO4 2− > NO3 − > SiO3 2− . Regeneration and column filtration showed attractive reusable and real application characteristic of AAF.