TY - JOUR

T1 - Surface modified of chitosan by TiO2@MWCNT nanohybrid for the efficient removal of organic dyes and antibiotics

AU - Rostami, Mohammad Saeid

AU - Khodaei, Mohammad Mehdi

AU - Benassi, Enrico

N1 - The authors would like to thank Razi University for the financial support. The computational resources were kindly provided by the HPCP at the Nazarbayev University, Astana, Kazakhstan. The authors would like to thank Razi University for the financial support. The computational resources were kindly provided by the Novosibirsk State University, Novosibirsk 630090, Russia.

PY - 2024/6/26

Y1 - 2024/6/26

N2 - Considering the increase in the discharge of industrial effluents containing dyes and antibiotic resistance as a consequence of increasing the prescription and easy distribution of antibiotic drugs at the global level, designing efficient, biodegradable and non-toxic absorbents is necessary to reduce environmental harm effects. Herein, we present a series of novel eco-friendly ternary hybrid nanocomposite hydrogels CS/TiO2@MWCNT (CTM) composed of chitosan (CS), TiO2, and multiwalled carbon nanotube (MWCNT) for removal of methylene blue (MB) and methyl orange (MO) and common antibiotic ciprofloxacin (CIP) in aqueous medium. The combination of MWCNT and TiO2 improves the physicochemical properties of CS hydrogel and increases the adsorption capacity toward pollutants in the presence of different loadings. CTM hydrogel showed a specific surface area of 236.45 m2 g−1 with a pore diameter of 7.89 nm. Adsorption mechanisms were investigated in detail using kinetic, isotherm, and thermodynamic studies of adsorption as well as various spectroscopic techniques. Adsorption of these pollutants by CTM nanocomposite hydrogel occurred using various interactions at different pHs, which showed the obvious dependence of CTM adsorption capacity on pH. Electrostatic attractions, complex formation, π-π stacking and hydrogen bonds played a key role in the adsorption process. The adsorption of MB, MO, and CIP was fitted with the Langmuir isotherm with maximum adsorption capacities of 531.91, 1763.6, and 1510.5 mg g−1, respectively. CTM had a minor decrease in adsorption strength and showed good structural stability even after 8 adsorptions–desorption cycles. The total cost of producing a 1 kg adsorbent was calculated to be $ 450, which helped us determine the economic feasibility of the adsorbent in large-scale applications.

AB - Considering the increase in the discharge of industrial effluents containing dyes and antibiotic resistance as a consequence of increasing the prescription and easy distribution of antibiotic drugs at the global level, designing efficient, biodegradable and non-toxic absorbents is necessary to reduce environmental harm effects. Herein, we present a series of novel eco-friendly ternary hybrid nanocomposite hydrogels CS/TiO2@MWCNT (CTM) composed of chitosan (CS), TiO2, and multiwalled carbon nanotube (MWCNT) for removal of methylene blue (MB) and methyl orange (MO) and common antibiotic ciprofloxacin (CIP) in aqueous medium. The combination of MWCNT and TiO2 improves the physicochemical properties of CS hydrogel and increases the adsorption capacity toward pollutants in the presence of different loadings. CTM hydrogel showed a specific surface area of 236.45 m2 g−1 with a pore diameter of 7.89 nm. Adsorption mechanisms were investigated in detail using kinetic, isotherm, and thermodynamic studies of adsorption as well as various spectroscopic techniques. Adsorption of these pollutants by CTM nanocomposite hydrogel occurred using various interactions at different pHs, which showed the obvious dependence of CTM adsorption capacity on pH. Electrostatic attractions, complex formation, π-π stacking and hydrogen bonds played a key role in the adsorption process. The adsorption of MB, MO, and CIP was fitted with the Langmuir isotherm with maximum adsorption capacities of 531.91, 1763.6, and 1510.5 mg g−1, respectively. CTM had a minor decrease in adsorption strength and showed good structural stability even after 8 adsorptions–desorption cycles. The total cost of producing a 1 kg adsorbent was calculated to be $ 450, which helped us determine the economic feasibility of the adsorbent in large-scale applications.

KW - Chitosan

KW - Ciprofloxacin

KW - Hydrogel

KW - Organic dyes

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85196805611&origin=inward&txGid=7ebf77a549d89d7b216f5643c1f85b9e

UR - https://www.mendeley.com/catalogue/fd031357-04e4-38ec-8562-76a64c5f585d/

U2 - 10.1016/j.ijbiomac.2024.133382

DO - 10.1016/j.ijbiomac.2024.133382

M3 - Article

C2 - 38914389

VL - 274

JO - International Journal of Biological Macromolecules

JF - International Journal of Biological Macromolecules

SN - 1879-0003

M1 - 133382

ER -