Electronic Theses and Dissertation

Abstrak sarah apriani (2025). pengaruh penambahan carbon quantum dots (cqds) dari kopi terhadap karakteristik film bioplastik dari pati aren (arenga pinnata) dan kitosan sebagai antioksidan. carbon quantum dots (cqds) sebagai nanomaterial karbon dapat dihasilkan dari berbagai bahan organik yang ramah lingkungan terutama dari limbah kulit buah kopi. penelitian ini bertujuan untuk menganalisis daya serap air film bioplastik, elastisitas kuat tarik film bioplastik dan aktivitas antioksidan film bioplastik setelah penambahan variasi cqds. panjang gelombang absorbansi cqds diperoleh melalui spektrofotometer uv-vis dengan panjang gelombang 320 nm dengan absorbansi sebesar 0,61. hasil karakterisasi ftir menunjukkan bahwa sampel cqds berbahan dasar limbah kulit kopi mengandung gugus fungsi o - h, c = c, c - x, dan c - o. variasi konsentrasi cqds dalam film ch/sps yang tercermin dari perubahan daya serap air. penambahan cqds juga berpengaruh terhadap sifat mekanik film yaitu peningkatan konsentrasi cqds cenderung menurunkan kekuatan tarik tetapi meningkatkan elastisitas material. peningkatan konsentrasi cqds dalam film bioplastik terbukti meningkatkan aktivitas antioksidan, yang menunjukkan bahwa cqds berperan sebagai agen antioksidan alami dengan kemampuan menangkap radikal bebas. kata kunci: carbon quantum dots, film bioplastik, antioksidan

Abstract Sarah Apriani (2025). The Effect of Adding Carbon Quantum Dots (CQDs) from Coffee on the Characteristics of Bioplastic Films from Palm Starch (Arenga pinnata) and Chitosan as an Antioxidant. Carbon Quantum Dots (CQDs) as carbon nanomaterials can be produced from various environmentally friendly organic materials, especially from coffee fruit skin waste. This study aims to analyze the water absorption capacity of bioplastic films, the elasticity of the tensile strength of bioplastic films and the antioxidant activity of bioplastic films after the addition of variations of CQDs. The absorbance wavelength of CQDs was obtained using a UV-Vis spectrophotometer with a wavelength of 320 nm with an absorbance of 0.61. The results of FTIR characterization showed that the CQDs sample made from coffee skin waste contained functional groups O - H, C = C, C - X, and C - O. Variations in the concentration of CQDs in the CH/SPS film were reflected in changes in water absorption. The addition of CQDs also affected the mechanical properties of the film, namely increasing the concentration of CQDs tended to decrease the tensile strength but increase the elasticity of the material. Increasing the concentration of CQDs in bioplastic films was shown to increase antioxidant activity, indicating that CQDs act as natural antioxidant agents with the ability to capture free radicals. Keywords: Carbon Quantum Dots, bioplastic film, antioxidant.