Volume No. 7 Issue No.: 4 Page No.: 1333-1339 April-June 2013

 

HYDROGEN PEROXIDE PRETREATMENT EFFICIENCY COMPARISON AND CHARACTERISATION OF LIGNIN RECOVERED FROM COIR PITH BLACK LIQUOR

 

Rojith G.* and Bright Singh I.S.

School of Environmental Studies, Cochin University of Science and Technology, Cochin, Kerala (INDIA)

 

Received on : November 05, 2012

 

ABSTRACT

 

Coir pith, an agro industrial residue can be utilised for valuable industrial product development and bioenergy generation. Hydrogen peroxide pretreatment with varying concentration of 2,5,10 and 20 % was performed on coir pith substrate to loosen the lignocellulosic structural binding. Comparison of mild and hard oxidative delignification pretreatment efficiency was done accordingly. Lignin content was analysed by modified Klason Lignin method. FTIR analysis was performed for functional group assessment and structural modification analysis. Effect of hydrogen peroxide pretreatment concentration on cellulose crytallinity were analysed by XRD method. Hydrogen peroxide pretreatment on the substrate generates Coir pith Black Liquor as filtrate from which lignin was recovered by acid precipitation method. Structural characterisation of recovered lignin was done by FTIR analysis. Delignification efficiency of 53 % was observed for 2 % treatment which varied for higher concentration of hydrogen peroxide treatment. Cellulose crystallinity change occurred as the pretreatment strength increases. FTIR analysis helps to identify characteristic peaks of lignin and cellulose. Changes in peaks indicate structural transformation induced due to hydrogen peroxide pretreatment. Changes in peaks indicate structural transformation induced due to hydrogen peroxide pretreatment.

 

Keywords : Coir pith, Hydrogen peroxide pretreatment, Delignification efficiency, Lignin recovery, FTIR, XRD, Klason Liqnin method

 

 

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