Abstract
Anatase mesoporous titanium nanofibers (m-TiO2 NFs) have been synthesized from calcination of the as-spun TiO2/polyvinyl pyrrolidone (PVP)/pluronic123 (P123) composite nanofibers at 450°C in air for 3h. The structures and the physicochemical properties of m-TiO2 NFs are characterized by scanning electron microscopy, X-ray diffraction, nitrogen adsorption–desorption isotherm analysis, and determination point of zero charge, respectively. An investigation of Cu(II) adsorption onto m-TiO2 NFs has been studied in this research. The pH effect, adsorption kinetics, and adsorption isotherms are examined in batch experiments. Experimental data were analyzed using pseudo-first order and pseudo-second order kinetic models. It was found that adsorption kinetics were the best fitting by a pseudo-second order kinetic model. The optimum pH for Cu(II) adsorption was found to be 6.0. The equilibrium data were analyzed by the Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich isotherm models, which revealed that the Freundlich isotherm is the best-fit isotherm for the adsorption of Cu(II). Compared to the TiO2 NFs (regular anatase titanium nanofibers) in the same experimental conditions to elucidate the role of the mesoporous structure of m-TiO2 NFs, experimental results showed that the m-TiO2 NFs had a better adsorption capacity for Cu(II) due to its higher surface area.
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