Volume No. 13 Issue No.: 04 Page No.: 374-381 April-June 2019

 

EXTRACTION AND APPLICATION OF CELLULOSE FROM RICE HUSK IN ADSORPTION OF FLUORIDE FROM CONTAMINATED WASTE WATER

 

Niladri Shikhar Saha, Papita Das and Chiranjib Bhattacharya

Department of Chemical Engineering, Jadavpur University, Kolkata (INDIA)

 

Received on : December 23, 2018

 

ABSTRACT

 

Rice Husk (RH) has 32.24% cellulose content; and the annual rice husk produce in India amounts to approximately 120 million tons. Cellulose was extracted from raw RH using alkaline hydrolysis, followed by bleaching treatment and acid hydrolysis and critical point drying. The synthesized cellulose was characterized by Fourier transform infrared (FTIR) spectroscopy, Scanning electron microscopy (SEM), X-ray diffraction (XRD) and Brunauer–Emmett–Teller (BET). The adsorption capacity of cellulose in fluoride solution was measured by electrode type fluoride meter. Adsorption studies were carried out by varying several parameters like adsorbent dosage(g/L), initial concentration(mg/L), pH, contact time(min), temperature(°C) and agitation speed(rpm). The adsorption efficiency of the obtained cellulose was measured in terms of removal percentage(%) and adsorption capacity(mg/g). The adsorption kinetics, isotherms and thermodynamics were investigated in detail to gain insights into the adsorption process. The experimental data from batch study was evaluated using Langmuir and Freundlich adsorption isotherm models to evaluate distribution of active sites on adsorbent surface and adsorption capacity(mg/g). The results show that the BET surface area of the cellulose reached 76.15m2/g. The Langmuir capacity of the cellulose in fluoride adsorption was 5.102mg/g at 300 K and pH 7. Cellulose extracted from RH appears to have profitable and parsimonious features to be termed as eco-friendly adsorbent.

 

Keywords : Rice Husk, Critical point drying, Cellulose, Fluoride, Adsorption, Isotherm model, Kinetic model.

 

 

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