Synthesis of Macro-, Meso-, and Microporous Carbons from Natural and Synthetic Sources, and Their Application as Adsorbents for the Removal of Quaternary Ammonium Compounds from Aqueous Solution
✍ Scribed by D.B. Akolekar; A.R. Hind; S.K. Bhargava
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 130 KB
- Volume
- 199
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
chemical inertness (toward heat in inert atmospheres for Macro-and mesoporous carbon samples have been prepared example) and their ability to endure harsh chemical environfrom both natural and synthetic sources. These natural and synments (including highly acidic/basic and organic media), thetic carbons ( along with other microporous samples) have been has resulted in considerable research interest in these types characterized, with composition, thermal decomposition mode of materials. The ability of an activated carbon to act as an and stability ( in inert and oxidizing atmospheres ) , and surface adsorbent or catalyst support depends then upon its structure, properties determined in each case. Order of thermal stability, surface area, pore size/volume, and pore size distribution.
porosity, and surface area have been determined, with carbons
Macro-and mesoporous carbons are of considerable interprepared from natural and synthetic sources exhibiting different est as adsorbents for the removal of bulkier organics from thermal decomposition modes. Differences in surface area were attributed to differences in porosity, based on micropore and total various industrial processes (6, 7). Microporous carbons, pore volume. The adsorption of a series of quaternary ammonium on the other hand, are useful as catalyst supports (5) and in ( QA ) compounds, dodecyltrimethylammonium bromide, tetradechemisorption processes (6). From a commercial applicacyltrimethylammonium bromide, and hexadecyltrimethylamtion point of view, the adsorption properties of activated monium bromide, onto macroporous and microporous carbons carbons are of interest to alumina refiners. The removal of was also investigated using Fourier transform infrared / attenubulkier organics from the Bayer process (used for refining ated total reflection spectroscopy. QA removal was found to inbauxite to smelting grade alumina) using activated carbon crease with increase in carbon chain length, with results indicatmay provide alumina refiners with a suitable, cost effective, ing that the nature of the carbon adsorbent ( with respect to means of reducing the impact of these types of organics on surface area and microporosity ) had little influence on QA upthe refining process. take.