Journal
GELS
Volume 7, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/gels7040178
Keywords
alginate; carbodiimide; cryogel; composite; methylene blue; montmorillonite
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Funding
- Scientific Research Projects Coordination Department of Yildiz Technical University [FYL-2018-3432]
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Macroporous hydrogels are gaining attention in wastewater treatment, with alginate/montmorillonite composite cryogels showing high porosity, mechanical elasticity, and effective methylene blue adsorption capacity. The cryogels exhibited a maximum adsorption capacity of 559.94 mg g(-1) against MB, with a high gelation yield and colossal water uptake capacity. Improved porosity and mechanical elasticity of the cryogels make them a highly potential alternative adsorbent for effective dye removal.
Currently, macroporous hydrogels have been receiving attention in wastewater treatment due to their unique structures. As a natural polymer, alginate is used to remove cationic dyes due to its sustainable features such as abundance, low cost, processability, and being environmentally friendly. Herein, alginate/montmorillonite composite macroporous hydrogels (cryogels) with high porosity, mechanical elasticity, and high adsorption yield for methylene blue (MB) were generated by the one-step cryogelation technique. These cryogels were synthesized by adding montmorillonite into gel precursor, followed by chemical cross-linking employing carbodiimide chemistry in a frozen state. The as-prepared adsorbents were analyzed by FT-IR, SEM, gel fraction, swelling, uniaxial compression, and MB adsorption tests. The results indicated that alginate/montmorillonite cryogels exhibited high gelation yield (up to 80%), colossal water uptake capacity, elasticity, and effective dye adsorption capacity (93.7%). Maximum adsorption capacity against MB was 559.94 mg g(-1) by linear regression of Langmuir model onto experimental data. The Pseudo-Second-Order model was fitted better onto kinetic data compared to the Pseudo-First-Order model. Improved porosity and mechanical elasticity yielding enhanced dye removal capacity make them highly potential alternative adsorbents compared to available alginate/montmorillonite materials for MB removal.
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