Carrageenan/calcium alginate composite hydrogel filtration membranes for efficient cationic dye separation.
Int J Biol Macromol
; 270(Pt 2): 132309, 2024 Jun.
Article
in En
| MEDLINE
| ID: mdl-38740157
ABSTRACT
The development of biopolymer-based filtration systems for water remediation applications is an extremely fascinating area of research. In this paper, we developed a biopolymer-based filtration system using sodium alginate (NaAlg) and carrageenan (Car) for the removal of the toxic cationic dye, methylene blue (MB). The membrane's properties were assessed using FTIR, TGA, UTM, FESEM, EDS, XRD, and water uptake, revealing commendable thermomechanical stability (5.79 MPa), good hydrophilicity, and compatibility. The experimental results further revealed that lambda Car/calcium alginate (λ-Car/CaAlg) exhibited superior dye rejection (100%) and flux (11.67 L m-2 h-1) compared to kappa Car/CaAlg (κ-Car/CaAlg) (99.22% and 11.19 L m-2 h-1) and plain alginate (CaAlg) (99.63% and 9.79 L m-2 h-1). The high MB rejection rate was attributed to the sieving mechanism and electrostatic interaction. A rejection rate of 100% was achieved at an initial MB concentration of 10 mg/L, pressure of 0.1 MPa, pH of 7, and temperature of 25°C. Furthermore, the hydrogel membranes demonstrated excellent recyclability over nine cycles, indicating their potential for water treatment applications.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Carrageenan
/
Water Purification
/
Coloring Agents
/
Alginates
/
Membranes, Artificial
Language:
En
Journal:
Int J Biol Macromol
Year:
2024
Document type:
Article
Country of publication:
Países Bajos