Chemistry, asked by rghvd7977, 11 months ago

Adsorption of anionic and cationic dyes onto granular activated carbon

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Answered by Anonymous
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The influence of the surface chemical groups of an activated carbon on the removal of different classes of dyes is evaluated. Starting from the same material (NORIT GAC 1240 PLUS), the following treatments were carried out in order to produce a series of samples with different surface chemical properties but with no major differences in their textural properties: oxidation in the liquid phase with 6 M HNO3 and 10 M H2O2 (acid materials) and heat treatment at 700°C in H2 or N2 flow (basic materials). The specific micropores volume and mesopores surface area of the materials were obtained from N2 adsorption equilibrium isotherms at 77 K. The surface chemistry was characterised by temperature programmed desorption , by the determination of the point of zero charge (pHpzc) and by the evaluation of the acidity/basicity of the samples. Elemental and proximate analyses were also carried out.





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