Adsorption Kinetic and Isotherms Studies on Lauric Acid Adsorption Using HCl-Enhanced Rice Husk Ash

Aidee Najmie Akhsan; Pengyong Hoo; Zainor Syahira Zainal; Siti Zullaikah; Qihwa Ng; Amira Mohd Nasib

doi:10.4028/p-6D3oS1

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HomeAdvances in Science and TechnologyAdvances in Science and Technology Vol. 175Adsorption Kinetic and Isotherms Studies on Lauric...

Adsorption Kinetic and Isotherms Studies on Lauric Acid Adsorption Using HCl-Enhanced Rice Husk Ash

Abstract:

Rice husk ash (RHA), a waste product of the rice mill, is rich in silica. This study aimed to investigate the use of RHA as a potential adsorbent for the removal of free fatty acid (FFA) from the waste frying oil (WFO). Acid pre-treatment of RH prior to combustion using hydrochloric acid (HCl) was proposed to improve its adsorption performance. The synthesized acid-pretreated RHAs were characterized using Fourier Transformed Infrared (FTIR), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS). It was found that the aRHAs achieved higher silica purity with low levels of organic impurities as compared to untreated RHA. Additionally, aRHAs possessed porous morphology, especially when treated with higher HCl concentration, as revealed by SEM analysis. EDS analysis confirmed the high silica purity with negligible amount of metal impurities for all the RHAs. For adsorption kinetic models and adsorption isotherms, results showed that the intraparticle diffusion model and the Langmuir isotherm gave the best description to the experimental data with the lowest Chi-square values, reported at 0.02 and 5.46, respectively.