TY - JOUR
T1 - Facile synthesis of double-cross-linked alginate-based hydrogel
T2 - Characterization and use in a context of circular economy for cationic dye removal
AU - Bendaoudi, Amine Ahmed
AU - Boudouaia, Nacer
AU - Jellali, Salah
AU - Benhafsa, Fouad Mekhalef
AU - Bengharez, Zohra
AU - Papamichael, Iliana
AU - Jeguirim, Mejdi
N1 - Publisher Copyright:
© The Author(s) 2023.
PY - 2023/7/31
Y1 - 2023/7/31
N2 - Hydrogels based on natural polysaccharides have received special attention in the last decade due to their interesting features, such as availability, biocompatibility, biodegradability and safety. Such characteristics may make them sustainable and eco-friendly materials for water and wastewater treatment, meeting the concept of circular economy. In this study, a novel double-cross-linked alginate-based hydrogel has been successfully synthesized using epichlorhydrin and sodium trimetaphosphate (STMP) as cross-linker agents and then used for the removal of methylene blue (MB) dye under different operating conditions. The obtained hydrogel was deeply characterized by using various analytical techniques, namely Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and differential scanning calorimetry. Experimental results showed that the synthesized double cross-linked hydrogel with relatively high STMP concentration (0.26 M) has promising structural and textural properties. This material exhibited excellent removal ability towards MB with a maximum adsorption capacity of about 992 mg/g for an initial pH of 10. The kinetic and isotherm modeling study revealed that the pseudo-second-order and Freundlich models fitted well the measured adsorption experimental data. The MB adsorption process onto the synthesized hydrogel is exothermic, feasible and spontaneous. It mainly includes electrostatic interaction and hydrogen bonds. These findings suggest that double-cross-linked alginate-based hydrogel can be considered as an attractive and potential adsorbent for an effective cationic dye removal from aqueous environments. The use of such a green adsorbent for the treatment of organic-pollutants-rich industrial wastewaters promotes sustainability and circular economy concepts.
AB - Hydrogels based on natural polysaccharides have received special attention in the last decade due to their interesting features, such as availability, biocompatibility, biodegradability and safety. Such characteristics may make them sustainable and eco-friendly materials for water and wastewater treatment, meeting the concept of circular economy. In this study, a novel double-cross-linked alginate-based hydrogel has been successfully synthesized using epichlorhydrin and sodium trimetaphosphate (STMP) as cross-linker agents and then used for the removal of methylene blue (MB) dye under different operating conditions. The obtained hydrogel was deeply characterized by using various analytical techniques, namely Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and differential scanning calorimetry. Experimental results showed that the synthesized double cross-linked hydrogel with relatively high STMP concentration (0.26 M) has promising structural and textural properties. This material exhibited excellent removal ability towards MB with a maximum adsorption capacity of about 992 mg/g for an initial pH of 10. The kinetic and isotherm modeling study revealed that the pseudo-second-order and Freundlich models fitted well the measured adsorption experimental data. The MB adsorption process onto the synthesized hydrogel is exothermic, feasible and spontaneous. It mainly includes electrostatic interaction and hydrogen bonds. These findings suggest that double-cross-linked alginate-based hydrogel can be considered as an attractive and potential adsorbent for an effective cationic dye removal from aqueous environments. The use of such a green adsorbent for the treatment of organic-pollutants-rich industrial wastewaters promotes sustainability and circular economy concepts.
KW - Alginate
KW - cross-linking
KW - mechanism
KW - methylene blue
KW - removal
UR - http://www.scopus.com/inward/record.url?scp=85166623544&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85166623544&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/6366a61e-bded-3a5c-a49b-3bb65d31110d/
U2 - 10.1177/0734242x231188667
DO - 10.1177/0734242x231188667
M3 - Article
C2 - 37522156
AN - SCOPUS:85166623544
SN - 0734-242X
SP - 734242X231188667
JO - Waste Management and Research
JF - Waste Management and Research
ER -