Synthesis of alginate-polycation capsules of different composition: characterization and their adsorption for [As(iii)] and [As(v)] from aqueous solutions

Cristopeer Thomas-Busani; José Andrei Sarabia-Sainz; Jaqueline García-Hernández; Tomás J Madera-Santana; Luz Vázquez-Moreno; Gabriela Ramos-Clamont Montfort

doi:10.1039/d0ra05135g

Synthesis of alginate-polycation capsules of different composition: characterization and their adsorption for [As(iii)] and [As(v)] from aqueous solutions

RSC Adv. 2020 Aug 3;10(48):28755-28765. doi: 10.1039/d0ra05135g.

Authors

Cristopeer Thomas-Busani¹, José Andrei Sarabia-Sainz², Jaqueline García-Hernández³, Tomás J Madera-Santana⁴, Luz Vázquez-Moreno¹, Gabriela Ramos-Clamont Montfort¹

Affiliations

¹ Coordinación de Ciencia de los Alimentos, Centro de Investigación en Alimentación y Desarrollo A.C. Carretera Gustavo Enrique Astiazarán Rosas, No. 46. Col. La Victoria C.P. 83304 Hermosillo Sonora Mexico gramos@ciad.mx.
² Laboratorio de Biofísica Médica, Departamento de Investigación en Física, Universidad de Sonora Blvd. Luis Encinas y Rosales. Col. Centro C.P. 83000 Hermosillo Sonora Mexico.
³ Coordinación Guaymas, Centro de Investigación en Alimentación y Desarrollo Sánchez Taboada Carretera al Varadero Nacional km 6.6, Col. Las Playitas, Guaymas, Sector Varadero, Las Playitas 85480 Heroica Guaymas Son Mexico.
⁴ Coordinación de Tecnología de Alimentos de Origen Vegetal, Centro de Investigación en Alimentación y Desarrollo Carretera Gustavo Enrique Astiazarán Rosas, No. 46. Col. La Victoria C.P. 83304 Hermosillo Sonora Mexico.

Abstract

The uptake of arsenite [As(iii)] and arsenate [As(v)] by functionalized calcium alginate (Ca-Alg) beads from aqueous solutions was investigated. Ca-Alg beads were protonated with poly-l-lysine (PLL) or polyethyleneimine (PEI) using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide/N-hydroxysuccinimide (EDC/NHS) or glutaraldehyde (GA) as crosslinking agents. Four types of protonated beads were prepared: Ca-Alg-EDC/NHS (PLL or PEI) and Ca-Alg-GA (PLL or PEI). Fourier transform infrared spectroscopy in total attenuated reflection mode (FTIR-ATR), analysis showed presence and increased intensity of bands corresponding to OH, NH, CH₂ and CH₃ groups in modifications with both polycations. In addition, thermogravimetric analysis and atomic force microscopy of all modified capsules showed an increase in thermal stability and uniformity of the capsules, respectively. Ca-Alg-EDC/NHS-PLL beads had the maximum adsorption capacity of [As(v)] (312.9 ± 4.7 μg g^-1 of the alginate) at pH 7.0 and 15 minute exposure, while Ca-Alg-EDC/NHS-PEI beads had the maximum adsorption capacity of [As(iii)] (1052.1 ± 4.6 μg g^-1 of alginate). However, all these EDC containing beads were degraded in the presence of citrate. Ca-Alg-GA-PEI beads removed 252.8 ± 9.7 μg of [As(v)] μg g^-1 of alginate and 524.7 ± 5.3 de [As(iii)] μg g^-1 of alginate, resulting the most stable capsules and suitable for As removal.