Three-Dimensional Hierarchical Structures of ZnO Nanorods as a Structure Adsorbent for Water Treatment

doi:10.1016/j.jmst.2016.11.022

Abstract

Abstract:

Three-dimensional (3D) ZnO nanorods with good adsorption property was successfully fabricated via a facile hydrothermal method, and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Energy Dispersive X-ray spectrometer (EDX) and a UV-vis spectrophotometer. It was found that the ZnO nanorods with a diameter of ~0.5 μm and the length of ~10 μm were firmly grown on the struts of the open-cell aluminum foams, and the 3D hierarchical structured adsorbent ZnO nanorods/Al foam (r-ZnO/AF) exhibits a higher adsorption capacity for Brilliant Blue R (BBR) in aqueous solutions, more stable sorption regenerable behavior and solid-liquid separability in contrast to the corresponding n-ZnO powder sample. The kinetics of the adsorption process was also discussed.

Key words: Structured adsorbent, Open-cell aluminum foam, Zinc oxide, Water treatment

Li Zhendong, Huang Yingjie, Wang Xingfu, Wang Dan, Wang Xinfu, Han Fusheng. Three-Dimensional Hierarchical Structures of ZnO Nanorods as a Structure Adsorbent for Water Treatment[J]. J. Mater. Sci. Technol., 2017, 33(8): 864-868.

Figures/Tables 6

Fig. 1. XRD patterns of (a) the OCAFS substrate, (b) n-ZnO powder, (c) r-ZnO/AF.

Fig.2. SEM images of Al foam (a), r-ZnO/AF in low magnification (b) and in high magnification (c), and EDX in the surface of r-ZnO/AF (d).

Fig.3. Photographs of BBR aqueous solution (a) and UV-vis absorption spectra of BBR solution (b) after different adsorption times.

Fig.4. Adsorption-time curves of BBR for r-ZnO/AF, n-ZnO powder and blank Al foam at different initial dye concentrations (a) and pseudo-second-order kinetic plots for r-ZnO/AF adsorbent (b).

Table 1 Kinetic parameters of r-ZnO/AF based on the pseudo-second-order model

C₀ (mg L^-1)	Q_e,exp (mg g^-1)	k₂ (g mg^-1 min^-1)	Q_e,cal (mg g^-1)	R²
25	48.8	0.000719	53.2	0.99904
50	98.4	0.000785	102.7	0.99919
75	128.6	0.000362	136.4	0.99907
100	142.9	0.000171	157.2	0.99695

Fig.5. Regeneration ratio of adsorption-regeneration by r-ZnO/AF and n-ZnO powder with 10 consecutive cycles.

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