Enhancing chemistry understanding and attitudes through an outreach education program on circular plastic economy: a case study with Thai twelfth-grade students

Abstract This study examines the impact of an outreach education in chemistry for circular plastic solutions (OEC-Circle) program on enhancing Thai 12th-grade students’ understanding of plastic-related chemistry and fostering positive learning attitudes. The program integrates the circular plastic economy through inquiry-based learning, including citizen inquiry and guided inquiry activities. The curriculum consists of three modules: Plastic Smart City, circular plastic economy, and sustainable polymer, blending lecture, demonstration, laboratory, and field experiences. A total of 32 students participated, and their learning outcomes were assessed using a pre- and post-test, along with a learning attitude about chemistry survey (CLASS-Chem). Results indicated a significant improvement in students’ understanding of topics like sustainable polymers and waste management, with a large effect size in the post-test. The CLASS-Chem survey also showed a positive shift in students’ attitudes, including increased interest, confidence, and an understanding of the real-world relevance of chemistry. These findings suggest that the program was effective in both improving students’ chemistry knowledge and fostering a deeper engagement with sustainability issues. The study highlights the potential of combining inquiry-driven learning with sustainability themes to enhance students’ attitudes toward chemistry and prepare them to address real-world challenges, particularly those related to plastic waste and sustainability.