Chemical recycling of polystyrene and polyvinyl chloride using nitric acid oxidation

Name: Arachaporn Malakul Na Ayuttaya

Organization : Chulalongkorn University. Faculty of Science

Name: Kusuma Pinsuwan

Organization : Chulalongkorn University. Faculty of Science

Name: Pakorn Opaprakasit

Organization : Thammasat University. Sirindhorn International Institute of Technology (SIIT)

Name: Atitsa Petchsuk

Organization : National Science and Technology Development Agency (NSTDA). National Metal and Materials Technology Center (MTEC)

Name: Mantana Opaprakasit

Organization : Chulalongkorn University. Faculty of Science

Email : mantana.o@chula.ac.th

LCSH: Polystyrene

LCSH: Polyvinyl chloride

LCSH: Plastic scrap -- Recycling

Abstract: A chemical upcycling process for polystyrene (PS) and polyvinyl chloride (PVC) into value-added feedstocks has been developed employing nitric acid oxidation. All studies were carried out at 170 °C for 3 hours using 5 g of PS, PVC, and PS/PVC mixture (1:1 w/w). The solid products were obtained in 2 separate fractions, i.e., rigid chunk solids (SS) and loose powder (S1). The SS/S1 content produced from PS, PVC, and PS/PVC mixture were 43/33, 66/19, and 47/5, respectively. FTIR spectra of the SS and S1 products of PVC resembled that of PVC, except that weak bands at 1717 (C=O), 1635 (C=C), and 1562 cm-1 (N-H or C=C) were additionally observed. In contrast, the SS and S1 products of PS and PS/PVC mixture remarkedly differed from PS and PVC. The spectra of SS and S1 from the PS/PVC mixture closely matched with S1 from PS, resembling benzoic acid. In addition to the appearance of functional groups of the oxidized structures, the CH stretching (2800-3100 cm⁻¹) and C-H deformation (751-761 cm⁻¹) bands of SS recovered from PS were much weaker compared to its starting PS counterparts, confirming chain scissions and oxidation reactions. This is also reflected in the TGA results.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2025

Modified: 2025-10-29

Issued: 2025-10-29

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BibliograpyCitation : In The Chemical Society of Thailand under the Patronage of Professor Dr. Her Royal Highness Princess Chulabhorn Krom Phra Srisavangavadhana and Suranaree University of Technology. Institute of Science. School of Chemistry. Pure and Applied Chemistry International Conference 2025 (PACCON 2025) (pp.713-718). Bangkok : The Chemical Society of Thailand under the Patronage of Professor Dr. Her Royal Highness Princess Chulabhorn Krom Phra Srisavangavadhana in association with the School of Chemistry, Institute of Science, Suranaree University of Technology, 2025

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