Studies on Influence of Organic Acid Leaching Using CH3COOH and C4H6O6 on The Characteristics of Green Silica Produced for Sustainable Industrial Purpose

¹ Master Program of Chemical Engineering, School of Postgraduate Studies, Universitas Diponegoro, Semarang, Indonesia
² Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro, Semarang, Indonesia

^* Corresponding author: auliacahyani7@gmail.com

Abstract

Rice husk is a biomass that constitutes 20-22% of Indonesia’s rice production by-products. Due to the low cost of raw materials and energy consumption, utilizing RH to produce silica can replace the production of synthetic silica. The type of organic acids used and the operating conditions during acid leaching play essential roles in the quality of green silica products. Temperature (28oC, 75oC) and duration (1h, 2h) treatment in acid leaching was applied with experimental method. Results showed the use of CH3COOH and C4H6O6 optimum to producing green silica with 92.21% purity, 61,25% of amorphous phase, increasing the surface area and pore volume of silica to 154,570 m2/g and 44.2513 cc/g. The highest silica yield reached at 99.26%, the whole analysis using SEM-EDX, XRD, and BETSAA. The highest moisture adsorption capacity of 825.6 mg/g meet the quality standard of SNI no. 06-2477-1991 for silica products with good adsorption quality. This study aims to explore the safer characteristics of green silica suitable for industrial purpose. The obtained results suggest applying organic acid leaching with CH3COOH and C4H6O6 can producing amorphous green silica. This method offers an alternative by using less hazardous materials, promoting environmentally friendly chemical processes in micro-scale production.