期刊
APPLIED SURFACE SCIENCE
卷 328, 期 -, 页码 606-613出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2014.12.094
关键词
Cr(VI); Fe-0 nanorods modified with chitosan; Porous anodic alumina; Isotherms; Adsorption kinetics; Thermodynamics
类别
资金
- China Textile Industry Association guide science and technology project [2013039]
- National Science Foundation of China (NSFC) [51375351]
- science and technology research project from the Hubei Province Department of Education of China [D20081702]
- Open Foundation Project of State Key Lab of Digital Manufacturing and Technology [DMETKF2012003]
Fe-0 nanorods modified with chitosan in porous anodic alumina (PAA) were prepared as adsorbent. Adsorption of trace Cr(VI) onto adsorbent was tested as a function of solution pH value, initial Cr(VI) concentration and adsorption time. The results showed that PAA can limit the size, disperse Fe-0 nanorods and protect them from oxidation. In the adsorption process, it was found that both PAA and chitosan can supply bridges between Fe-0 nanorods and Cr(VI) through the surface electrostatic attraction, and a small amount of PAA was etched. The optimum adsorption capacity obtained from the Langmuir model is 118.76 mg g(-1) which agrees with the experimental value at pH 5.0. X-ray photoelectron spectroscopy revealed that Cr(VI) was reduced to Cr(III) on the adsorbent surface. The adsorption behavior of Cr(VI) onto adsorbent was fitted well with the Langmuir model. The adsorption process followed the pseudosecond-order kinetic model, which implied that the adsorption process was chemisorptions. Intraparticle diffusion study shows that the internal diffusion of adsorbent is not the sole rate-controlling step. The Gibbs free energy change (Delta G degrees < 0) indicated that the process of Cr(VI) onto adsorbent was spontaneous. Besides, the aluminum sheets could be regenerated and be anodized to produce PAA. (C) 2014 Elsevier B.V. All rights reserved.
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