作    者：朱华跃,付永前,蒋茹,等
影响因子：2.538
刊物名称：Applied Surface Science
出版年卷：2013, 285: 865-873

文章摘要：Novel chitosan-modified magnetic graphitized multi-walled carbon nanotubes (CS-m-GMCNTs) weresynthesized via a suspension cross-linking method. Composition, morphology and magnetic propertiesof as-prepared CS-m-GMCNTs were characterized by XRD, SEM-EDS, BET and VSM. The large saturationmagnetization (12.27 emu g−1) allows fast separation of CS-m-GMCNTs from treated aqueous solution.The adsorption of congo red (CR) on CS-m-GMCNTs was strongly dependent on pH, temperature of theaqueous phase and adsorbent dosage. Up to 100 and 94.58% color removal could be achieved in 100 mincontact time with 10 and 50 mg L−1of initial concentrations, respectively. The adsorption capacity of CRonto CS-m-GMCNTs could reach 262.9 mg g−1. The pseudo-second-order kinetic model with high corre-lation coefficients (R2> 0.999) was suitable to describe the process of CR adsorption onto CS-m-GMCNTs.The Langmuir model fitted the adsorption isotherm data better than the Freundlich model. Values ofthermodynamic parameters (G◦, H◦and S◦) indicated that the adsorption process was stronglydependent on temperature of the aqueous phase, and spontaneous and endothermic process in nature.Therefore, CS-m-GMCNTs adsorbent displays main advantages of excellent dispersion, convenience sep-aration and high adsorption capacity, which implies their potential application in the environmentalcleanup.

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