Synthesis of β-cyclodextrin-based nanosponges for remediation of 2,4-D polluted waters
Valente, Artur J.M. ; Pirozzi, Domenico ; Cinquegrana, Alessia ; Utzeri, Gianluca LU
; Murtinho, Dina
and Sannino, Filomena
(2022)
In Environmental Research
215.
- Abstract
Two cyclodextrin-based nanosponges (CD-NSs) were synthesized using diamines with 6 and 12 methylene groups, CDHD6 and CDHD12, respectively, and used as adsorbents to remove 2,4-D from aqueous solutions. The physico-chemical characterization of the CD‒NSs demonstrated that, when using the linker with the longest chain length, the nanosponges show a more compact structure and higher thermal stability, probably due to hydrophobic interactions. SEM micrographs showed significant differences between the two nanosponges used. The adsorption of 2,4-D was assessed in terms of different parameters, including solid/liquid ratio, pH, kinetics and isotherms. Adsorption occurred preferentially at lower pH values and for short-chain crosslinked... (More)
Two cyclodextrin-based nanosponges (CD-NSs) were synthesized using diamines with 6 and 12 methylene groups, CDHD6 and CDHD12, respectively, and used as adsorbents to remove 2,4-D from aqueous solutions. The physico-chemical characterization of the CD‒NSs demonstrated that, when using the linker with the longest chain length, the nanosponges show a more compact structure and higher thermal stability, probably due to hydrophobic interactions. SEM micrographs showed significant differences between the two nanosponges used. The adsorption of 2,4-D was assessed in terms of different parameters, including solid/liquid ratio, pH, kinetics and isotherms. Adsorption occurred preferentially at lower pH values and for short-chain crosslinked nanosponges; while the former is explained by the balance of acid-base characteristics of the adsorbent and adsorbate, the latter can be justified by the increase in the crosslinker-crosslinker interactions, predominantly hydrophobic, rather than adsorbent-adsorbate interactions. The maximum adsorption capacity at the equilibrium (qe) was 20,903 mmol/kg, obtained using CDHD12 with an initial 2,4-D concentration of 2 mmol/L. An environmentally friendly strategy, based on alkali desorption, was developed to recycle and reuse the adsorbents. On the basis of the results obtained, cyclodextrin-based nanosponges appear promising materials for an economically feasible removal of phenoxy herbicides, to be used as potential adsorbents for the sustainable management of agricultural wastewaters.
(Less)
- author
- Valente, Artur J.M.
; Pirozzi, Domenico
; Cinquegrana, Alessia
; Utzeri, Gianluca
LU
; Murtinho, Dina
and Sannino, Filomena
- publishing date
- 2022-12
- type
- Contribution to journal
- publication status
- published
- keywords
- 2,4-D removal, Agrochemicals, Effect of crosslinkers, Sustainable regeneration, Wastewater remediation, β-Cyclodextrin-based nanosponges
- in
- Environmental Research
- volume
- 215
- article number
- 114214
- publisher
- Elsevier
- external identifiers
-
- pmid:36058273
- scopus:85137766072
- ISSN
- 0013-9351
- DOI
- 10.1016/j.envres.2022.114214
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © 2022 Elsevier Inc.
- id
- 5533f793-5a9c-4528-b4e4-755474c464b8
- date added to LUP
- 2024-07-22 10:50:18
- date last changed
- 2024-08-15 10:01:58
@article{5533f793-5a9c-4528-b4e4-755474c464b8,
abstract = {{<p>Two cyclodextrin-based nanosponges (CD-NSs) were synthesized using diamines with 6 and 12 methylene groups, CDHD6 and CDHD12, respectively, and used as adsorbents to remove 2,4-D from aqueous solutions. The physico-chemical characterization of the CD‒NSs demonstrated that, when using the linker with the longest chain length, the nanosponges show a more compact structure and higher thermal stability, probably due to hydrophobic interactions. SEM micrographs showed significant differences between the two nanosponges used. The adsorption of 2,4-D was assessed in terms of different parameters, including solid/liquid ratio, pH, kinetics and isotherms. Adsorption occurred preferentially at lower pH values and for short-chain crosslinked nanosponges; while the former is explained by the balance of acid-base characteristics of the adsorbent and adsorbate, the latter can be justified by the increase in the crosslinker-crosslinker interactions, predominantly hydrophobic, rather than adsorbent-adsorbate interactions. The maximum adsorption capacity at the equilibrium (q<sub>e</sub>) was 20,903 mmol/kg, obtained using CDHD12 with an initial 2,4-D concentration of 2 mmol/L. An environmentally friendly strategy, based on alkali desorption, was developed to recycle and reuse the adsorbents. On the basis of the results obtained, cyclodextrin-based nanosponges appear promising materials for an economically feasible removal of phenoxy herbicides, to be used as potential adsorbents for the sustainable management of agricultural wastewaters.</p>}},
author = {{Valente, Artur J.M. and Pirozzi, Domenico and Cinquegrana, Alessia and Utzeri, Gianluca and Murtinho, Dina and Sannino, Filomena}},
issn = {{0013-9351}},
keywords = {{2,4-D removal; Agrochemicals; Effect of crosslinkers; Sustainable regeneration; Wastewater remediation; β-Cyclodextrin-based nanosponges}},
language = {{eng}},
publisher = {{Elsevier}},
series = {{Environmental Research}},
title = {{Synthesis of β-cyclodextrin-based nanosponges for remediation of 2,4-D polluted waters}},
url = {{http://dx.doi.org/10.1016/j.envres.2022.114214}},
doi = {{10.1016/j.envres.2022.114214}},
volume = {{215}},
year = {{2022}},
}