Adsorption of 2-Acetyl Pyrroline Using Treated Rice Husk Char

Carla Goncalves De Oliveira Sarmento; Chi Huey Ng; Awang Bono; Duduku Krishnaiah; S M Anisuzzaman; Jidon Janaun.

2-Acetyl-1-Pyrroline (2-AP) is a main aromatic compound that gives fragrant characteristics in rice. However, 2-AP is a volatile compound that would be escaped easily with moisture from the rice during the drying operation and resulted in poorer rice quality. Therefore, the search of a material that is capable in adsorbing 2-AP and maintaining the rice quality is crucial. In this paper, two adsorbents, which are the untreated rice husk char (URHC) and treated rice husk char (TRHC) on their adsorption of 2-AP were investigated. TRHC was chosen as the adsorbent for further adsorption studies due to its high surface area and high adsorption capacity. The removal efficiency was determined at 60 min, in which 93% of 2-AP was removed by TRHC with an adsorption capacity of 625 mg/g. The adsorption isotherm was well-fitted with Freundlich model as compared to Langmuir model with correlation coefficient value of R² 0.9952, suggesting multilayer adsorption. From the conducted adsorption kinetics study, the adsorption fitted into pseudo-second order model as compared to pseudo-first order with a R² value of 0.9720, indicative the occurrence of chemisorption in the adsorption process. The result demonstrated that TRHC is a promising adsorbent for the adsorption of 2-AP due to its high adsorption capacity, high removal efficiency, low cost, and environmentally friendly nature.

KEYWORDS: Adsorption; aromatic rice of 2-Acetyl -1- Pyrroline; untreated rice hush char; treated rice husk char; paddy




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