Résidus agricoles: les rafles de maïs, une source potentielle de silice
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Le ma�s est la culture la plus abondante dans le monde. Environ 18 kg d'�pis de ma�s sont produits � partir de 100 kg de grains de ma�s. Les �pis de ma�s, qui sont un sous-produit des grains de ma�s, sont g�n�ralement jet�s comme d�chets ou br�l�s comme combustibles de mauvaise qualit�. Cela pose un s�rieux probl�me de stockage et d'�limination. Cet ouvrage pr�sente une technologie simple pour produire du silicate de sodium et de la silice pr�cipit�e � partir de r�sidus agricoles. La cendre de rafles de ma�s (CCA) a �t� produite en trempant les rafles de ma�s dans trois acides organiques diff�rents, � savoir l'acide citrique, l'acide ac�tique et l'acide oxalique. La CCA a ensuite �t� m�lang�e � une solution alcaline pour produire une solution de silicate de sodium, et la silice pr�cipit�e a �t� produite par neutralisation de la solution de silicate de sodium. La teneur en oxyde de sodium et en silice de la solution de silicate de sodium a �galement �t� d�termin�e. Les particules de silice pr�cipit�e extraites ont �t� caract�ris�es par des techniques de spectroscopie infrarouge � transform�e de Fourier (FTIR), de diffraction des rayons X et de microscopie optique. L'analyse pr�sent�e dans cet ouvrage devrait �tre particuli�rement utile aux professionnels des domaines du g�nie chimique et de la science des mat�riaux.
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