Removal of Cr(VI) from aqueous solutions using polymer nanotubes
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The self-assembled polymer nanotubes were obtained by a simple solvothermal method. Its physicochemical properties were characterized by SEM, BET, TGA, FT-IR, XPS, and solid-state 13C magnetic resonance. The effects of initial pH, dosage, and coexisting ions were evaluated for its Cr(VI) adsorption performances. The result showed that polymer nanotubes surface had a large number of organic functional groups and porous structures. In 140 mg/L Cr(VI) solution, polymer nanotubes obtained the largest Cr(VI) adsorption capacity of 147.81 mg/g. Adsorption kinetics and isotherms agreed well with the pseudo-second-order and Redlich–Peterson models, respectively. The desorption process showed that the polymer nanotubes were easy to regenerate in strong polarity solution and had a high removal efficiency. Ionic strength played an important role in the adsorption and the adsorption interaction contained electrostatic interaction, reduction, and chelation in this work. The self-assembly method will constitute a highly efficient adsorbent.
The authors are grateful to the Applied Basic Research Programs of Science and Technology Department of Sichuan Province (2018JY0115), the Application Technology Research and Development Special Project of Nanchong, China (18YFZJ0035), the Meritocracy Research Funds of China West Normal University (17YC013, 17YC139), and the Open Fund of Sichuan Key Laboratory of Chemical Synthesis and Pollution Control (No. CSPC2015-6-2).
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Conflict of interest
The authors declare that they have no conflict of interest.
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