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Fabrication of a Recyclable Sodium Alginate-Zeolite/Glutaraldehyde (SA-HZ/GA) Composite Adsorption Membrane and Its Efficient Removal of Cu(II)
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DOI：10.1002/app.70756.png)
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Abstract
En 中文
Cu(II) contamination in industrial wastewater constitutes a major challenge to global environmental management as traditional treatment methods are plagued by high energy consumption, secondary pollution risks, and substantial costs. A technical strategy was developed to prepare glutaraldehyde-crosslinked sodium alginate-zeolite (SA-HZ/GA) composite adsorption membranes via phase inversion. This approach leverages zeolites' structural reinforcement and mass transfer channel formation combined with glutaraldehyde's crosslinking properties to optimize material performance. SA-HZ/GA features abundant mesopores with sizes ranging from 2 to 16 nm and exhibits fracture strength over 74% higher than pure sodium alginate membranes. At pH 5 and 25 degrees C, its Cu(II) adsorption capacity reaches 46.80 mg/g with over 80% removal efficiency maintained after 5 cycles with 0.1 M HCl as desorbent. The adsorption process fits the Langmuir model (R 2 = 0.999) and follows pseudo-second-order kinetics, indicating monolayer chemical adsorption. Thermodynamic analysis revealed that the adsorption was spontaneous (Delta G = -12.5 kJ/mol) and endothermic (Delta H = 28.4 kJ/mol), with a positive entropy change (Delta S = 0.14 kJ/(mol & centerdot;K)) suggesting increased randomness at the solid-liquid interface. This work provides an efficient, stable, and cost-effective engineering solution for heavy metal-laden wastewater treatment.
Keywords:
ion adsorption
membrane
phase inversion
sodium alginate
zeolite
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