Hydrophobic surface modification on eggshell biowaste for sustainable applications

Name: Jiranan Thongkhum

Organization : Kasetsart University. Faculty of Science

Name: Ramida Rattanakam

Organization : Kasetsart University. Faculty of Science

Name: Supakit Achiwawanich

Organization : Kasetsart University. Faculty of Science

Email : supakit.a@ku.th

keyword: Biowaste utilization

LCSH: Eggshells -- Recycling

LCSH: Hydrophobic surfaces

LCSH: Oleic acid -- Chemical modification

Abstract: Eggshells are a common biowaste generated from households, agriculture, and the food industry. Typically, they are discarded in landfills without proper treatment, contributing to environmental issues. In this study, eggshell waste was biorecycled into a hydrophobic material through a simple surface modification using oleic acid. Superhydrophobicity was evaluated via contact angle measurements. Surface modifications were performed using eggshells and oleic acid in weight ratios of 1:0.2, 1:0.1, 1:0.04, and 1:0.02. The 1:0.2 ratio resulted in a gum-like material after compression, while other ratios produced solid materials after oven drying. Fourier-transform infrared (FTIR) analysis confirmed the presence of methylene (-CH₂-) stretching of oleic acid at 2852 and 2922 cm⁻¹. Water contact angles (WCAs) for modified eggshell (MES) pellets at 1:0.02 and 1:0.04 ratios were 120° and 110°, respectively, whereas no water droplet was observed on untreated eggshell (ES) pellets. These results indicate an improvement in the hydrophobic properties of eggshells after modification.

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

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2025

Modified: 2025-10-24

Issued: 2025-10-24

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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.389-392). 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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