An improved method for production of silica from rice hull ash |
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Authors: | Kalapathy U Proctor A Shultz J |
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Affiliation: | Centre for Rural Development and Technology, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi. padmav@rdat.iitd.ernet.in |
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Abstract: | Biosorption of monovalent ions Na+ and K+, by deactivated protonated yeast (Saccharomyces cerevisiae) at controlled pH, was compared with biosorption of divalent ions Ca2+ and Mg2+ to help to understand the underlying bindingmechanisms. The adsorption for monovalent ions was accompanied by H+ release. Divalent ions were sorbed by proton displacement, and also an additional mode not accompanied by release of H+. The sorption uptake of both monovalent and divalent metal ions increased with pH in the range 3-7 peaking at 6.75. Equilibrium sorption isotherms at pH = 6.75 showed that the totalmaximum biosorptive capacity for metal ions decreased in the following order: Ca > Mg > Na > or = K. |
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