Tailoring of spherical nanocellulose via esterification with methionine followed by protonation to generate two different adsorbents for mercuric ions and Congo red.
Int J Biol Macromol
; : 135313, 2024 Sep 04.
Article
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| MEDLINE
| ID: mdl-39242000
ABSTRACT
Herein, we report two different adsorbents from spherical nanocellulose (SNC) in successive steps, for the adsorption of Hg2+ ions and Congo red (CR). Cellulose extracted from pine needles was subsequently converted to SNC through mixed acidic hydrolysis. As-obtained SNC was esterified with methionine at C6 of the anhydroglucose unit of SNC to SNC-methionine ester (SNC-ME). The amino group of methionine residue in SNC-ME was protonated to SNC-PME with positive surface charge. The SNC-ME and SNC-PME were evaluated as Hg2+ ions and CR adsorbents, respectively. The SNC, SNC-ME, SNC-PME, Hg2+-loaded SNC-ME, and CR-loaded SNC-PME were characterized by FTIR, XRD, XPS, Zeta potential, BET, FESEM, EDS, and surface charge analysis. SNC-ME showed Hg2+ ions removal efficiency of 94.8⯱â¯1.9â¯% in 40â¯min, while SNC-PME showed CR removal efficiency of 96.1⯱â¯3.8â¯% in 90â¯min. The adsorption data of both the adsorbents fitted best into pseudo-second order kinetic and Langmuir isotherm. The maximum adsorption capacity of SNC-ME for Hg2+ ions was 211.5⯱â¯3.1â¯mg/g and that of SNC-PME for CR was 281.1⯱â¯7.1â¯mg/g. The astounding recyclability of the adsorbents for ten repeat cycles with significant cumulative adsorption capacity of 760.9⯱â¯12.8â¯mg/g for Hg2+ ions and 758.8⯱â¯12.7â¯mg/g for CR endorses their spectacular potentiality for wastewater treatment.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
Int J Biol Macromol
Año:
2024
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Article
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Países Bajos