A study of microcrystalline cellulose prepared from parawood (<i>Hevea brasiliensis</i>) sawdust waste using different acid types
AbstractMicrocrystalline cellulose (MCC) from parawood sawdust (PWS) was successfully prepared by acid hydrolysis method. In this work, parawood sawdust waste was obtained from furniture factory. Initially, PWS was subjected to an alkali pulping and bleaching processes, respectively. After that, the microcrystalline cellulose was prepared from bleached pulp using hydrochloric and sulfuric acid in order to compare the effect of acid type. The parameters for acid hydrolysis process were investigated in terms of reaction time and pulp to acid ratio at constant temperature of 80oC. The properties of obtained MCC such as functional groups, degree of polymerization (DP), crystallinity index (CrI), thermal stability and morphology were evaluated. XRD analysis, indicated native cellulose type I structure of MCC, while SEM micrographs revealed rod-like shape morphology in its aggregates. It can be observed that at the same conditions using hydrochloric acid to prepare MCC provided higher degree of polymerization and thermal stability compared to sulfuric acid. Therefore, the optimum condition for preparing PWS-MCC was to carry out the reaction for 2 h with pulp to acid ratio 1:15 using hydrochloric acid solution at 80oC.
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