Comparative Study of Various Pretreatment Reagents on Rice Husk and Structural Changes Assessment of the Optimised Pretreated Rice Husk
Bioresource Technology, 135: 116-119
21 Pages Posted: 19 Jan 2015
Date Written: 2013
The performance of alkalis (NaOH and Ca(OH)2) and acids (H2SO4, HCl, H3PO4, CH3COOH, and HNO3) in the pretreatment of rice husk was screened, and a suitable reagent was assessed for subsequent optimisation using response surface methodology. From the assessment, HCl that hydrolysed rice husk well was optimised with three parameters (HCl loading, pretreatment duration, and temperature) using Box-Behnken Design. The optimised condition (0.5% (w/v) HCl loading, 125oC, 1.5 hours) is relatively mild, and resulted in ~22.3 mg TRS/ml hydrolysate. The reduced model developed has good predictability, where the predicted and experimental results differ by only 2%. The comprehensive structural characterization studies that involved FT-IR, XRD, SEM, and BET surface area determination showed that the pretreated rice husk consisted mainly of cellulose and lignin. Compared to untreated rice husk, pretreated rice husk possessed increased pore size and pore volume, which are expected to be beneficial for fungal growth during fermentation.
Keywords: Response surface methodology; optimization; rice hulls; pretreatment; structural assessment.
JEL Classification: C09, C93, N55, O13, Q00, Q10, Q16, Q20, Q23, Q40, Q42
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