Activated carbon: classifications, properties and by James F. Kwiatkowski

By James F. Kwiatkowski

Offers topical study within the learn of activated carbon, consisting of themes corresponding to the outside chemistry of activated carbons and as catalyst helps; thermal processing of activated carbons from agro-industrial wastes; activated carbon as a steel oxide aid; and, extra.

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Activated carbon: classifications, properties and applications

Offers topical study within the examine of activated carbon, inclusive of themes similar to the outside chemistry of activated carbons and as catalyst helps; thermal processing of activated carbons from agro-industrial wastes; activated carbon as a steel oxide help; and, extra.

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Aber et al. [3] have prepared ACF from natural Kenaf fibers using K2HPO4 as chemical activator and investigated its application in the removal of phenolic compounds from contaminated water. Phenolic compounds are a group of toxic chemicals which exist in wastewaters. The researchers have optimized the preparation of ACF by Taguchi experimental design method, and then studied the kinetics and the isotherms of phenol and pnitrophenol adsorption on ACF. According to the results of equilibrium adsorption experiments, the adsorption of phenol and p-nitrophenol follows Langmiur model.

AC has good mechanical resistance, adsorbs water and provides sufficient surface area for the microorganisms. Chung et al. [115] have found high NH3 and H2S removal efficiencies from waste gases using biofilters. They have inoculated the GAC with Arthrobacter oxydans CH8 for NH3 removal and Pseudomonas putida CH11 for H2S removal. The results show that physical adsorption of NH3 by GAC is efficient in first 10 days. After this period, ammonia gas is biodegraded by inoculated microorganisms. Average ammonia and H2S removal efficiencies are greater than 96% and 100%, respectively over an operating period of 140 days without a need to pH adjustment.

The researchers have shown that the hybrid system has higher removal efficiency (about 100%) compared with the process containing GAC alone. Hybrid system does not have significant dependence on humidity and BTEX concentration. The results show that the photocatalytic oxidation unit degrades more than 70% of the BTEX desorbed from GAC unit. So this work shows that a photocatalytic oxidation step after a GAC adsorption unit can help to control the indoor concentration of BTEX compounds and to regenerate the used GAC.

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