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• W2022991938 endingPage "289" @default.
• W2022991938 startingPage "282" @default.
• W2022991938 abstract "Several activated carbons were obtained by H3PO4 at 500 °C, under increasing acid concentrations of 30–70%. Products were characterized by N2 at 77 K, and proved to be highly microporous with high surface area and pore volume that increased with impregnation ratio. Two modified carbons were prepared by concurrently passing N2 during pyrolysis of impregnated precursor with 50% H3PO4 at 500 °C, and post-heat treatment at 800 °C for one carbon. A low reduction in porosity accompanied this treatment. Equilibrium adsorption of methylene blue (MB) proved good uptake of the bulky dye, which improved considerably with impregnant concentration that was related to enhanced porosity. Dynamic removal of MB was carried out by running solutions of influent concentrations, of 100–200 mg/L, through a mini-column. Many column performance parameters were estimated at different stages on the typical S-shaped breakthrough curves: volume treated, amounts uptaken, bed service time, height of mass transfer zone, and column exhaustion characteristics. Increased impregnation ratio improved column performance, as well as forcing N2 pyrolysis or extra heat-treatment. Activated carbon impregnated with 70% H3PO4 and carbonized at 500 °C exhibited the best properties which prevailed upon raising treated dye concentration to 150 and 200 mg/L, although degraded its capacity due to the limited mass of adsorbent and to the short contact time." @default.
• W2022991938 created "2016-06-24" @default.
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• W2022991938 creator A5059538468 @default.
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• W2022991938 date "2008-01-01" @default.
• W2022991938 modified "2023-10-16" @default.
• W2022991938 title "Removal of methylene blue by carbons derived from peach stones by H3PO4 activation: Batch and column studies" @default.
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• W2022991938 doi "https://doi.org/10.1016/j.dyepig.2006.08.039" @default.
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