The effect of hydrogen ion concentration upon the absorption of dyes by cellulose and fillers Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/n870zv58b

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  • The dyeing of paper is one of the most important processes in the manufacture of that material. Fully 95 percent of the paper that is produced is colored to a greater or lesser extent, and in many eases the reproduction of a shade is essential. That pH is an important factor in the dyeing of paper has been realized, but very little has been done to determine the quantitative effect. This latter was the purpose of this work, and in order that the nature of the process be more fully realized, theories of dyeing were discussed. Experimental results are as follows: The adsorption of Methylene Blue from water solutions of different concentrations was studied and found to follow Freundlich's adsorption law. Adsorption of Methylene Blue at different pH values, where the pH was controlled by means of McIlvaine's buffers, showed a rather steady increase with increased pH, with the exception that on alumina the adsorption rose to a maximum and thereafter decreased. With the same dye, but with the pH varied by means of Al₂(SO₄)₃ - NaOH solutions, adsorption followed, for all cases, the same trend as for alumina above. Adsorption of Victoria Green increased continuously with increased pH when the pH was regulated by Al₂(SO₄)₃ - NaOH solutions. In the higher pH values the adsorption on the fillers and cellulose did not differ materially from the adsorption on alumina alone. Albolith and china clay, however, showed a relatively great affinity for the dye at lower pH values. A study of Alizarine Blue, with pH controlled by Al₂(SO₄)₃ - NaOH solutions, demonstrated that the maximum adsorption was between a pH of about 5.8 and 6.6. Adsorption was very great in this range, but in no case much greater than on alumina alone. Adsorption of Orange R. O., with pH controlled as above, proceeded much as for Alizarine Blue, the maximum adsorption falling between about pH 4.9 and 5.4. Adsorption on albolith and china clay was much greater than on alumina alone, but for the other substances this was not true. Adsorption of the dye was not so great as for Alizarine Blue. A colloidal viewpoint was adopted, as far as possible, for the explanation of the process of dyeing in the cases studied. That alumina is very important in the dyeing of paper was demonstrated.
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