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X‐ray diffraction and scanning electron microscope studies of processed rice hull silica
Author(s) -
Proctor Andrew
Publication year - 1990
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02540770
Subject(s) - tridymite , potassium , particle size , scanning electron microscope , materials science , cristobalite , chemical engineering , particle (ecology) , mineralogy , adsorption , chemistry , organic chemistry , composite material , metallurgy , oceanography , quartz , engineering , geology
The structure and composition of processed rice hull ash were studied to better understand its adsorption of the soy oil components, lutein and free fatty acids. The silica‐rich ash was composed largely of low order cristobalite and tridymite in the form of opal CT, with variable particle size. On heating of the ash there was conversion to a more ordered form of opal C, fusing of particles, and loss of potassium. Acid washing, following heating, also removed potassium and slightly reduced particle size further. Crystal form, particle size, particle fusion and potassium content may be important factors influencing ash adsorption of soy oil components.