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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 10 of 41 (0.078 seconds)Spelling suggestions: "subject:"matematerials, general"" "subject:"datenmaterials, general""
| 1 |
An investigation of the adsorption of silver from aqueous solutionAllen, William January 1981 (has links)
The work presented in this thesis is concerned with the adsorption of silver from aqueous solution, on soda-glass, polyethylene and polypropylene. The silver concentrations used, ranged from 0.5 to 100 mg dm-3, and were investigated at a series of temperatures. The silver was present as AnalaR silver nitrate in doubly deionised water, and the adsorbed silver was detected as silver -110m using a Nal(Tl) well-type crystal to count the gamma activity. The study indicates that silver adsorption on glass is extremely pH sensitive, increasing with increasing pH, and reaching a maximum value at pH 11.5. At pH values greater than 11.5 silver adsorption is significantly reduced. The pH dependence was shown to be important at silver concentrations ranging from 0.5 to 100 mg dm-3. The presence of added cations, other than the hydrogen ion, also inhibit the adsorption of silver. The pH work was extended to include desorption under acid conditions, and the results have been used to formulate a set of guidelines, in an attempt to improve existing analytical technique when handling trace concentrations of silver. A contact-time study was carried out at various temperatures and concentrations of silver, to establish a tentative equilibrium time for the adsorption process. A kinetic analysis has been applied, from which specific rates for the forward and reverse processes have been assigned. The effect of pH and concentration on these rates has also been considered. The temperature dependence of silver adsorption was investigated, and a series of isotherms were produced at 281, 293, 298 and 303 K. The isotherms indicate a positive temperature coefficient for the adsorption of silver on glass. A thermodynamic treatment was applied, and a heat of adsorption calculated. A possible mechanism for the adsorption of silver on soda-glass has been proposed. The work was extended to investigate the adsorption of silver on substrates apart from glass, namely, polyethylene and polypropylene. The results have been compared to those obtained for glass.
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| 2 |
Potentiometric behaviour of surfactantsJones, D. L. January 1980 (has links)
No description available.
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| 3 |
An investigation into the weldability of two new ferritic stainless steelsThomas, C. R. January 1980 (has links)
No description available.
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| 4 |
Kinetic and structural studies on template polymerisationAl-Awawi, S. January 1982 (has links)
No description available.
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| 5 |
Sulphide capacity measurements of lime-iron oxide-silica and soda-silica slagsDerici, H. R. January 1980 (has links)
No description available.
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| 6 |
Acoustic emissions from refractoriesBell, D. A. January 1984 (has links)
No description available.
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| 7 |
An experimental study of the genesis of diamonds by high temperature - high pressure treatmentsAllen, B. P. January 1980 (has links)
No description available.
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| 8 |
Ultrasonic harmonic generation and relaxation in aluminium and nickelSiriwitayakorn, S. January 1980 (has links)
No description available.
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| 9 |
Creep at low stresses and intermediate temperatureSritharan, T. January 1981 (has links)
No description available.
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| 10 |
A morphological study of two molecular complexes of poly ethylene oxide with sodium ionsLee, C. C. January 1980 (has links)
No description available.
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