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- W1994476595 abstract "In this work, a composite from α‐cellulose coated with conducting polypyrrole by in situ polymerization using potassium persulfate as oxidant was obtained. The composite was characterized by fourier transform infrared (FTIR) spectroscopy, cyclic voltammetry, UV/Vis spectroscopy, and scanning electron microscopy (SEM) analysis showed homogeneous coating of α‐cellulose with polypyrrole (PPy) to produce a composite with a conductivity of 3.5 × 10 −5 S/m. Batch aqueous adsorption experiments of the reactive red 120 (RR120) dye onto the synthesized material were conducted. The results showed that this composite is an efficient adsorbent for RR120 dye removal. For the adsorption experiments set to an initial pH of 3.9, the adsorption capacity was 15.6 mg of dye/g of composite for an equilibrium concentration (in the liquid) of RR120 dye equal to 1,000 mg/L, whereas a value of 96.1 mg of dye/g of composite was obtained when the solution pH was set to 2.0 for the same equilibrium concentration. When performing adsorption experiments using pure α‐cellulose, dye adsorption was insignificant at any pH value. Adsorption isotherm for RR120 was described by a typical Freundlich model. The transient adsorption of RR120 on the synthesized composite was described by a general three‐resistance model that includes the transport on the film that surrounds the composite particles, diffusion inside the particles, and adsorption on the surface of the particles. A fitting of the uptake curves was performed allowing the estimation of values for the effective diffusivity, D 0 , and the adsorption rate coefficient, k 1 . For the adsorption experiments with an initial pH value set to 3.9, D 0 was estimated as 1.05 × 10 −10 m 2 /s, whereas k 1 was 1.65 × 10 −4 L n /g mg n − 1 s; the corresponding values of k 1 at pH = 2 and 9.0 were 3.18 × 10 −4 and 5.16 × 10 −5 , respectively. POLYM. COMPOS., 36:312–321, 2015. © 2014 Society of Plastics Engineers" @default.
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- W1994476595 date "2014-02-24" @default.
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- W1994476595 title "Synthesis of α-cellulose/polypyrrole composite for the removal of reactive red dye from aqueous solution: Kinetics and equilibrium modeling" @default.
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- W1994476595 doi "https://doi.org/10.1002/pc.22945" @default.
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