Graphene nanosheets homogeneously incorporated in polyurethane sponge for the elimination of water-soluble organic dyes

Shoichi Manabe; Vipin Adavan Kiliyankil; Shoichi Takiguchi; Tsuguo Kumashiro; Bunshi Fugetsu; Ichiro Sakata

doi:10.1016/j.jcis.2020.10.012

Graphene nanosheets homogeneously incorporated in polyurethane sponge for the elimination of water-soluble organic dyes

J Colloid Interface Sci. 2021 Feb 15:584:816-826. doi: 10.1016/j.jcis.2020.10.012. Epub 2020 Oct 13.

Authors

Shoichi Manabe¹, Vipin Adavan Kiliyankil², Shoichi Takiguchi³, Tsuguo Kumashiro³, Bunshi Fugetsu⁴, Ichiro Sakata⁵

Affiliations

¹ School of Engineering, The University of Tokyo, 7-3-1 Bunkyo-Ku, Tokyo 113-8656, Japan; Nanosummit. Co.ltd, 1-19-7 Kamiaoki, Kawaguchi-city, Saitama, Japan. Electronic address: manabe@ipr-ctr.t.u-tokyo.ac.jp.
² School of Engineering, The University of Tokyo, 7-3-1 Bunkyo-Ku, Tokyo 113-8656, Japan. Electronic address: vipin@ipr-ctr.t.u-tokyo.ac.jp.
³ Nanosummit. Co.ltd, 1-19-7 Kamiaoki, Kawaguchi-city, Saitama, Japan.
⁴ The University of Tokyo Institute for Future Initiatives (IFI), The University of Tokyo, 7-3-1 Bunkyo-Ku, Tokyo 113-0033, Japan.
⁵ School of Engineering, The University of Tokyo, 7-3-1 Bunkyo-Ku, Tokyo 113-8656, Japan; The University of Tokyo Institute for Future Initiatives (IFI), The University of Tokyo, 7-3-1 Bunkyo-Ku, Tokyo 113-0033, Japan.

PMID: 33121756
DOI: 10.1016/j.jcis.2020.10.012

Abstract

Highly dispersed graphene nanosheets (GNS) are directly integrated into polyurethane sponge for the very first time. Individual GNS with an average thickness of 5 nm were uniformly encapsulated in polyurethane sponge (PUF). Highly durable, flexible, hydrophilic GNS/PUF demonstrated excellent organic dye absorption properties. For a detailed study, we selected typical water-soluble organic dyes such as methylene blue (MB), ethidium bromide (EtBr), eosin Y (EY). The adsorption behavior follows the Langmuir isotherm model indicating strong monolayer chemisorption. Adsorption capacity (μmol/g) of GNS while using in GNS/PUF is 586.8 (MB), 843.1 (EtBr), and 813.3 (EY). Thermodynamic study on the adsorption with three organic dyes using GNS/PUF revealed that the process was spontaneous and exothermic in nature. Additionally, the rate of adsorption is higher and follow the pseudo-second-order kinetic model. The detailed pH-dependent study showed that cationic dyes' adsorption increases with an increase in pH, and anionic dyes follow the opposite trend. The overall results show that the new adsorbent has highly suitable for practical application.

Keywords: Adsorbent; Dispersion; Graphene nanosheets; Organic dye; Polyurethane spongiform.