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

By James F. Kwiatkowski

Provides topical study within the examine of activated carbon, consisting of themes comparable 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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They have investigated the adsorption capacity and the rate of treated ACF in the removal of Cr(VI) from aqueous solutions. The results show that increasing current density from 0 to 450 mA m-1, increases the equilibrium amount of adsorbed Cr (VI) on ACF from 293 to 372 μmol g-1. Anodic oxidation not only enhances the adsorption rate and capacity of ACF, but also improves its mechanical strength. The electrical polarization of ACF surface not only enhances adsorption rate and capacity, but also helps the regeneration of ACF after electroadsorption.

Various works are done in the removal of organic and inorganic pollutants from aqueous and gaseous phases using ACF [3, 139-142]. 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.

The following paragraphs introduce some environmental applications of PAC. PAC is used to improve the performance of membranes and increase their life time. In hybrid systems of PAC-membrane, PAC adsorbs organic pollutants in the solution. This, results in a decrease in the amount of organics loaded to the membrane and therefore the fouling problem in membranes is reduced. Gai and Kim have reported the role of PAC in the performance of membrane water treatment systems [80]. 2 µm. 4%. The trans-membrane pressure (TMP) in the presence of PAC reaches 16 kPa after 65 days while in the absence of PAC it is 61 kPa after 48 days.

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