Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 31, No. 4 (April 2018) 533-537    Article in Press

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  ISOLATIONAND CHARACTERIZATION OF NANOCRYSTAL FROM CORNCOB WASTE USING H2SO4 HYDROLYSIS METHOD (RESEARCH NOTE)
 
H. Harahap, R. Nawansyah, H. Nasution, Taslim and Iriany
 
( Received: August 22, 2017 – Accepted in Revised Form: November 30, 2017 )
 
 

Abstract    Corncob is one of the industrial waste has cellulose content of 39.1 wt%, which makes it has high potential to be a raw material in the production of cellulose nanocrystal. Corncob was delignificated with 3.5 wt% HNO3 and NaNO2 10 mg, precipitated process with 17.5 wt% NaOH, and bleached with 10 wt% H2O2. Cellulose nanocrystal was obtained by hydrolysis using 45 wt% H2SO4. Corncob and cellulose nanocrystal was characterized by Fourier Transform Infra Red (FTIR) and showed that the absorption peak indicated the presence of cellulose clusters was obtained from corncob and cellulose nanocrystal has many similarities and there was no new bond formation. Cellulose nanocrystal particle size was observed by Transmission Electron Microscopy (TEM) and the result showed the size of cellulose nanocrystal was 9-29 nm. Crystallinity index of cellulose nanocrystal from corncob determined by X-Ray Diffraction (XRD) was 70%. This showed the atomic structure of cellulose nanocrystal quite regular so obtained a high crystallinity index.

 

Keywords    Cellulose Nanocrystal; Corncob; Crystallinity Index; Delignification; Hydrolysis

 

چکیده   

تفاله ذرت یکی از ضایعات صنعتی است که حاوی 39 درصد سلولز است، ماده اولیه مناسبی برای تولید نانوکریستال سلولز محسوب می شود. تفاله ذرت با استفاده از محلول 5/3 درصد وزنی اسید نیتریک و 10 میلی گرم نتریت سدیم و محلول سود 5/17 درصد لیگنین زدائی شده است سپس با محلول اب اکسیژنه 10 درصد وزنی سفید شده است. نانوکریستال سلولز با هیدرولیز اسید سولفوریک 45 درصد انجام شده است. مشخصات تفاله ذرت و نانوکریستال سلولز با استفاده از FTIR تعیین گردید. طیف های جذب بدست آمده نشان داده است که توده های سلولز از تفاله ذرت با نانوکریستال سلولزتشابه مطلوبی داشته است و پیوند جدید تشکیل نشده است. اندازه ذرات نانوکریستال سلولز توسط TEM مشاهده گردید در محدوده 29-9 نانومتر بوده است. اندیس و درجه کریستالی نانوکریستال سلولزاز تفاله ذرت با استفاده از اشعه ایکس و XRD بمیزان 70 درصد تعیین گردید. این نتایج نشان میدهد که ساختار اتمی نانوکریستال سلولز کاملا متعارف بوده که از اندیس کریستالی مطلوبی برخوردار است.

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