Efficient adsorption of selenium (Se(IV) and Se(VI)) from water using Acacia senegal polysaccharide with multiple amine groups: Synthesis and application

Lingzhen Kong; Xingtang Liang; Yanjun Zhan; Shufei Jiao; Yunying Zhen; Min Liu; Jisuan Tan; Yanzhen Yin

doi:10.1016/j.ijbiomac.2023.127458

Efficient adsorption of selenium (Se(IV) and Se(VI)) from water using Acacia senegal polysaccharide with multiple amine groups: Synthesis and application

Int J Biol Macromol. 2023 Dec 31;253(Pt 7):127458. doi: 10.1016/j.ijbiomac.2023.127458. Epub 2023 Oct 14.

Authors

Lingzhen Kong¹, Xingtang Liang¹, Yanjun Zhan¹, Shufei Jiao¹, Yunying Zhen¹, Min Liu¹, Jisuan Tan², Yanzhen Yin³

Affiliations

¹ Guangxi Key Laboratory of Green Chemical Materials and Safety Technology, Beibu Gulf University, Qinzhou 515000, China; College of Petroleum and Chemical Engineering, Beibu Gulf University, Qinzhou 515000, China.
² Guangxi Key Laboratory of Green Chemical Materials and Safety Technology, Beibu Gulf University, Qinzhou 515000, China; College of Petroleum and Chemical Engineering, Beibu Gulf University, Qinzhou 515000, China. Electronic address: tanjisuan@bbgu.edu.cn.
³ Guangxi Key Laboratory of Green Chemical Materials and Safety Technology, Beibu Gulf University, Qinzhou 515000, China; College of Petroleum and Chemical Engineering, Beibu Gulf University, Qinzhou 515000, China. Electronic address: yinyanzhen@bbgu.edu.cn.

PMID: 37844816
DOI: 10.1016/j.ijbiomac.2023.127458

Abstract

In this study, an amine-rich gel (ARAS) was prepared by chemically altering Acacia senegal (AS). ARAS acts as an adsorbent for selenium. Owing to the introduction of amino functional groups and a remarkable specific surface area (91.89 g/m²), ARAS shows maximum adsorption capacities at 75 and 130 mg g^-1 for Se(IV) and Se(VI), respectively. The removal efficiency of ARAS is higher (ω_SeIV = 98.2 % and ω_SeVI = 98.6 %) at lower concentrations (C_SeIV = 100 ppm and C_SeVI = 95 ppm) and the adsorption equilibrium is achieved within 60 min. The adsorption process of Se (IV) and Se (VI) via ARAS is elucidated using the Quasi-Second-Order kinetic and Langmuir models. The enhanced adsorption capacity of the adsorbent could be attributed to the synergistic effects of electrostatic attraction, hydrogen bonding, and specific physicochemical properties. Thermodynamic studies reveal that the surface adsorption process is spontaneous and exothermic. Notably, ARAS maintains remarkable adsorption stability under a variety of solution conditions, including variable pH (4-11), NaCl concentrations (0-1 M), and the presence of organic solvents. It retains approximately 60 % of its initial adsorption capacity for Se(IV) and Se(VI) after three adsorption cycles. Therefore, ARAS with its cost-effectiveness and exceptional performance shows considerable potential for applications in water treatment.

Keywords: Acacia senegal; Se(IV) and Se(VI) removal; Selenium pollution.

MeSH terms

Acacia*
Adsorption
Amines
Hydrogen-Ion Concentration
Kinetics
Polysaccharides
Selenium* / chemistry
Senegal
Water Pollutants, Chemical* / chemistry

Substances

Selenium
Water Pollutants, Chemical
Polysaccharides
Amines