In-situ Growth of Nb2O5 Nanorods on Diatomite and Highly Effective Removal of Cr(VI)

doi:10.15541/jim20170308

Abstract

Abstract:

Nb₂O₅ nanorods decorated diatomite were synthesized via a hydrothermal method by using niobic acid, ammonium oxalate and sodium dodecyl benzene sulfonate (SDBS). The as-prepared samples were characterized by SEM, TEM, XRD, BET, and FT-IR techniques. The Nb₂O₅nanorod was obtained with length of 500~700 nm and diameter of 25~35 nm. BET test showed that specific surface area of Nb₂O₅ nanorods decorated diatomite reached 157 m²/g which show a high adsorbance tendence. Under visible light irradiation, the adsorption capacity for Cr (VI) could be 220 mg/g. With the assistance of UV-light photoreduction, the maximum removal capacity for Cr (VI) could be 340 mg/g, and the absorbed Cr(VI) was transformed to Cr(III). After photodegradation for five times, the degradation rate of Cr(VI) (100 mg/L) were still at about 93%. Nb₂O₅ nanorods/diatomite could adsorb Cr(VI) from sewage effectively and in the meantime accomplish the toxicity degradation, showing a promising treatment of Cr(VI) containing waste water.

Key words: diatomite, Nb₂O₅nanorod, Cr(VI), adsorption, toxicity degradation

CLC Number:

TQ174

DU Yu-Cheng, WANG Xue-Kai, HOU Rui-Qin, WU Jun-Shu, ZHANG Shi-Hao, QI Chao. In-situ Growth of Nb₂O₅ Nanorods on Diatomite and Highly Effective Removal of Cr(VI)[J]. Journal of Inorganic Materials, 2018, 33(5): 557-564.

Figures/Tables 9

Fig. 1 SEM images of (A) the Nb2O5/diatomite samples, (B) NS-1, (C) NS-2, (D) NS-3 and (E)-(F) NS-4

Fig. 2 (A) TEM image and (B) high resolution TEM images. Insert in (A) is the multiple electron diffraction rings in the SAED patterns of NS-4 sample

Fig. 3 XRD patterns of diatomite (A), samples NS-1 (B), NS-2 (C), NS-3 (D), and NS-4(E)

Fig. 4 N2 adsorption-desorption isotherms of NS-2 and NS-4 samples with insert showing the pore-size distributions

Fig. 5 (A) Effect of the solution pH on the efficiency of Cr(VI) adsorption, and (B) effect of the initial Cr (Ⅵ) concentrations on the efficiency of Cr(Ⅵ) adsorption under UV and visible light irradiation

Fig. 6 (A) Time-dependent ultraviolet-visible (UV) absorption spectrum of the Cr(Ⅵ) reduction by the sample NS-4 and (B) the time-dependent photoreduction rate under different conditions

Fig. 7 Stability of NS-4 sample for Cr (Ⅵ) photodegradation at pH=7

Fig. 8 FT-IR spectra of (a) raw diatomite and NS-4 sample (b) before and (c) after Cr(Ⅵ) adsorption

Fig. 9 (A) Full-scan XPS spectra, (B) Nb3d XPS spectra, and (C) O 1s XPS spectra of NS-4 (a) before and (b) after the photocatalytic reduction of Cr(Ⅵ), and (D) Cr2p XPS spectrum of NS-4 sample after the photocatalytic reduction of Cr(Ⅵ)

References 24

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In-situ Growth of Nb₂O₅ Nanorods on Diatomite and Highly Effective Removal of Cr(VI)

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