Selenium and arsenic removal from water using amine sorbent, competitive adsorption and regeneration

Jinshan Wei; Bo Shen; Gan Ye; Xianghua Wen; Yonghui Song; Jin Wang; Xiaoguang Meng

doi:10.1016/j.envpol.2020.115866

Selenium and arsenic removal from water using amine sorbent, competitive adsorption and regeneration

Environ Pollut. 2021 Apr 1:274:115866. doi: 10.1016/j.envpol.2020.115866. Epub 2020 Oct 31.

Authors

Jinshan Wei¹, Bo Shen², Gan Ye³, Xianghua Wen², Yonghui Song⁴, Jin Wang³, Xiaoguang Meng⁵

Affiliations

¹ College of Materials Science and Engineering, Key Laboratory of Optoeletronic Devices and Systems, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China; State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China; Center for Environmental Systems, Stevens Institute of Technology, Hoboken, NJ, 07030, USA. Electronic address: jwei7@stevens.edu.
² State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China.
³ College of Materials Science and Engineering, Key Laboratory of Optoeletronic Devices and Systems, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China.
⁴ State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
⁵ Center for Environmental Systems, Stevens Institute of Technology, Hoboken, NJ, 07030, USA.

PMID: 33277062
DOI: 10.1016/j.envpol.2020.115866

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.

Keywords: Acrylic amine fiber; Adsorbent regeneration; Arsenic; Competition adsorption; Organic acid; Selenium.

MeSH terms

Adsorption
Amines
Arsenic* / analysis
Humans
Hydrogen-Ion Concentration
Kinetics
Selenium*
Water
Water Pollutants, Chemical* / analysis
Water Purification*

Substances

Amines
Water Pollutants, Chemical
Water
Selenium
Arsenic