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- W3047472220 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." @default.
- W3047472220 created "2020-08-10" @default.
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- W3047472220 date "2020-01-01" @default.
- W3047472220 modified "2023-10-18" @default.
- W3047472220 title "Synthesis of alginate–polycation capsules of different composition: characterization and their adsorption for [As(<scp>iii</scp>)] and [As(<scp>v</scp>)] from aqueous solutions" @default.
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- W3047472220 doi "https://doi.org/10.1039/d0ra05135g" @default.
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