期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 283, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2022.125981
关键词
SA-GO aerogels; Supercritical drying; Azo dyes; Adsorption
资金
- FAPESC (Foundation for Support to Research and Innovation of the State of Santa Catarina, Brazil) [PROEX 1624/2018]
- CAPES (Coordination for the Improvement of Higher-Level Personnel, Brazil) [404347/2016-9]
- CNPq (Na-tional Council of Technological and Scientific Development, Brazil)
In this study, hybrid aerogel beads of sodium alginate (SA) and graphene oxide (GO) were successfully synthesized and their properties were investigated. The SA-GO aerogels showed high tartrazine adsorption capacity and well-fitted adsorption isotherms, suggesting their potential application in wastewater treatment.
In this work, hybrid aerogel beads of sodium alginate (SA) and graphene oxide (GO) were synthesized by the external gelation method, dried by supercritical CO2, and applied for tartrazine removal from aqueous media. The effects of drying time, calcium chloride (CaCl2) and GO content on the aerogel properties were first investigated. The SA and SA-GO aerogel beads presented a homogeneous size distribution with Polydispersity Index (PDI) lower than 10% and volumetric shrinkages and compressive strengths up to 25%. The maximum tartrazine adsorption capacity of 420.36 mg/g achieved by SA-GO aerogel was 3-fold higher than for pure SA aerogel beads (129.64 mg/g). The adsorption isotherms described properly the experimental tartrazine adsorption and indicated that the absorption process was governed by the mass transfer mechanism. The results suggest that the prepared aerogels are promising adsorbents materials for wastewater treatment.
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