On the use of metal-organic framework-based adsorbent from recycled PET bottles for Eriochrome Black T removal

In this study, a metal–organic framework (MOF) adsorbent from recycled polyethylene terephthalate (PET) bottles was developed to effectively remove Eriochrome Black T (EBT) dye present in synthetic wastewater. A sustainable, “greener” route of MOF synthesis was adopted involving microwave-enabled de...

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Bibliographic Details
Published in:	Materials today : proceedings Vol. 65; pp. 3312 - 3320
Main Authors:	Bool, Reaner Jacqueline A., Luwalhati, Ghia C., Tan, Nicole Elizabeth Y., Aquino, Anita P., Maalihan, Reymark D.
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 2022
Subjects:	Adsorption Dye removal Eriochrome Black T Metal organic framework PET bottles Terephthalic acid Metal organic framework Eriochrome Black T Dye removal Adsorption Terephthalic acid PET bottles
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Summary:	In this study, a metal–organic framework (MOF) adsorbent from recycled polyethylene terephthalate (PET) bottles was developed to effectively remove Eriochrome Black T (EBT) dye present in synthetic wastewater. A sustainable, “greener” route of MOF synthesis was adopted involving microwave-enabled depolymerization of PET to terephthalic acid (TPA) and conversion of the latter to its organic salt linker form. Results from differential scanning calorimetry (DSC), X-ray diffraction (XRD) analysis, Fourier transform infrared (FTIR) spectroscopy, and thermogravimetric analysis (TGA) not only revealed the structure of the as-prepared MOF, but also proved the presence of EBT molecules on the adsorbent during the dye removal process. A ∼77% maximum removal was reached after 90 min and the adsorption was best explained by Langmuir model having 82.5 mg/g maximum monolayer capacity. Kinetic studies also showed the adsorption to be pseudo-second order with a two-stage intraparticle diffusion process. The effective performance of MOF on EBT removal was also verified by the presence of potential adsorbent-adsorbate interactions such as ionic, hydrogen bonding, and π–π stacking. Thus, the as-fabricated PET-derived MOF is considered a decent, value–added material acting as a sustainable adsorbent for organic dyes present in contaminated water.
ISSN:	2214-7853 2214-7853
DOI:	10.1016/j.matpr.2022.05.396