alexa A simple method for production of pure silica from rice hull ash.


Research & Reviews: Journal of Pure and Applied Physics

Author(s): U Kalapathy, A Proctor, J Shultz

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Rice hull ash (RHA), a waste product of the rice industry is rich in silica. A simple method based on alkaline extraction followedby acid precipitation was developed to produce pure silica xerogels from RHA, with minimal mineral contaminants. The silica gelsproduced were heated to 80 o C for 12 h to obtain xerogels. Silica and mineral contents of xerogels were determined by energydispersive X-ray (EDX) and inductively-coupled plasma (ICP) emission spectrometers, respectively. Xerogels produced from RHAhad 93% silica and 2.6% moisture. The major impurities of silica produced from RHA at an extraction yield of 91% were Na, K, andCa. Acid washing prior to extraction resulted in silica with a lower concentration of Ca (<200 ppm). However, ®nal water washingof the xerogel was more eective in producing silica with lower overall mineral content (Na<200 ppm and K<400 ppm). X-raydiraction patterns revealed the amorphous nature of silica xerogel. Fourier transform infrared (FTIR) data indicated the presenceof siloxane and silanol groups. Ó 2000 Elsevier Science Ltd. All rights reserved.

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This article was published in Bioresour. Technol and referenced in Research & Reviews: Journal of Pure and Applied Physics

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