Preparation of graphene from polyethylene terephthalate (PET) bottle wastes and its use for the removal of Methylene blue from aqueous solution

Duy Khiem Nguyen; Thi Dung Nguyen; Hoang Sinh Le; Duong Duc La; Nguyen Thi Hong Phuong Phuong

doi:10.62239/jca.2024.030

Authors

Duy Khiem Nguyen VN-UK Institute for Research and Executive Education, The University of Danang, Danang city, 550000, Vietnam Author
Thi Dung Nguyen Graduate School of Applied Chemistry, Hanyang University, Ansan 15588, Republic of Korea Author
Hoang Sinh Le VN-UK Institute for Research and Executive Education, The University of Danang, Danang city, 550000, Vietnam Author
Duong Duc La Institute of Chemistry and Materials, 17 Hoang Sam, Nghia Do, Cau Giay, Hanoi 100000, Vietnam Author
Nguyen Thi Hong Phuong School of Chemical and Life Science, Hanoi University of Science and Technology, 1 Dai Co Viet, Hai Ba Trung, Hanoi 100000, Vietnam Author

DOI:

https://doi.org/10.62239/jca.2024.030

Keywords:

Plastic waste, graphene, polyethylene terephthalate (PET), methylene blue, adsorption

Abstract

We present a method to produce graphene flakes (GFs) from polyethylene terephthalate (PET) bottle wastes by the pyrolysis method using modified bentonite as a catalyst. The as-synthesized GFs are analyzed in terms of crystal phase, morphology, and surface chemistry. The synthesized GFs have a porous, thin, and leaf-like morphology with a length ranging from a few hundred nanometers to a few tens of micrometers. The XRD and FT-IR results confirm the graphitization of PET and the presence of oxygen-containing functional groups on the surface of synthesized GFs. The obtained GFs are used as adsorbents for the removal of methylene blue (MB) from aqueous solution. The effects of various factors including, contact time, pH, and initial MB concentration, on the MB removal efficiency are examined. In addition, the adsorption isotherm models of Langmuir and Freundlich are studied. The best-fitting model is observed with the Freundlich isotherm model.

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