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. 2023 Jun 5;13(25):16797-16814.
doi: 10.1039/d3ra02160b.

Ni-Al layered double hydroxide-coupled layered mesoporous titanium dioxide (Ni-Al LDH/LM-TiO2) composites with integrated adsorption-photocatalysis performance

Li-Yuan Zhang  1   2   3 , Yan-Lin Han  1 , Min Liu  1   2   3 , Sheng-Lian Deng  1
Affiliations

Ni-Al layered double hydroxide-coupled layered mesoporous titanium dioxide (Ni-Al LDH/LM-TiO2) composites with integrated adsorption-photocatalysis performance

Li-Yuan Zhang et al. RSC Adv. .

Abstract

Nickel aluminum layered double hydroxides (Ni-Al LDHs) and layered mesoporous titanium dioxide (LM-TiO2) were prepared via a simple precipitation process and novel precipitation-peptization method, respectively, and Ni-Al LDH-coupled LM-TiO2 (Ni-Al LDH/LM-TiO2) composites with dual adsorption and photodegradation properties were obtained via the hydrothermal approach. The adsorption and photocatalytic properties were investigated in detail with methyl orange as the target, and the coupling mechanism was systematically studied. The sample with the best performance was recovered after photocatalytic degradation, which was labeled as 11% Ni-Al LDH/LM TiO2(ST), and characterization and stability studies were carried out. The results showed that Ni-Al LDHs showed good adsorption for pollutants. Ni-Al LDH coupling enhanced the absorption of UV and visible light, and the transmission and separation of photogenerated carriers were also significantly promoted, which was conducive to improving the photocatalytic activity. After treatment in the dark for 30 min, the adsorption of methyl orange by 11% Ni-Al LDHs/LM-TiO2 reached 55.18%. Under illumination for 30 min, the decolorization rate of methyl orange solution reached 87.54%, and the composites also showed an excellent recycling performance and stability.

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Conflict of interest statement

The authors declare that they have no conflicts of interest.

Figures

Fig. 1
Fig. 1. Flow chart for the preparation of Ni–Al LDHs/LM-TiO2.
Fig. 2
Fig. 2. SEM of simple TiO2, LM-TiO2, LDHs and LDHs/LM-TiO2 (a) simple TiO2, (b) LM-TiO2, (c) LDHs, and (d) LDHs/LM-TiO2, and (e) histogram of the particle size distribution of LDHs/LM-TiO2.
Fig. 3
Fig. 3. XRD patterns of TiO2 with various coupling ratios and LDHs (a) simple TiO2, (b) 0%, (c) 9%, (d) 11%, (e) 13%, (f) LDHs, and (g) 11% (ST).
Fig. 4
Fig. 4. Adsorption–desorption isotherms and pore size distribution of (a) LM-TiO2, (b) 11% LDHs/LM-TiO2 and (c) Ni–Al LDHs.
Fig. 5
Fig. 5. UV-Vis-Abs of various LDHs/LM-TiO2.
Fig. 6
Fig. 6. Photon energy relation diagram of various LDHs/LM-TiO2.
Fig. 7
Fig. 7. FT-IR spectra of the different materials (a) LM-TiO2, (b) 11% LDHs/LM-TiO2, (c) 11% LDHs/LM-TiO2(ST), and (d) Ni–Al LDHs.
Fig. 8
Fig. 8. XPS spectra of LM-TiO2, 11% LDHs/LM-TiO2, 11% LDHs/LM-TiO2(ST) and LDHs (a) survey, (b) Ti 2p peaks, (c) O 1s and O 2s peaks, (d) Ni 2p peaks, (e) Al 2p peaks and (f) C 1s peaks.
Fig. 9
Fig. 9. Fluorescence spectra of different LDHs/LM-TiO2 (a) 0% and (b) 11%.
Fig. 10
Fig. 10. Photocurrent curves of different materials (a) LM-TiO2, (b) 11% LDHs/LM-TiO2, and (c) Ni–Al LDHs.
Fig. 11
Fig. 11. Electrochemical impedance spectroscopy of various materials (a) LM-TiO2, (b) 11% LDHs/LM-TiO2, and (c) Ni–Al LDHs.
Fig. 12
Fig. 12. Adsorption rates of methyl orange on the different LDHs/LM-TiO2 samples.
Fig. 13
Fig. 13. Langmuir (a) and Freundlich (b) isotherms.
Fig. 14
Fig. 14. Pseudo-first-order (a–c) and pseudo-second-order (d–f) kinetic models of various LDHs/LM-TiO2 samples.
Fig. 15
Fig. 15. Decolorization rates of methyl orange by simple TiO2 and LDHs/LM-TiO2 with various coupled ratios (a) blank group, (b) TiO2, (c) 0%, (d) 9%, (e) 11%, and (f) 13%.
Fig. 16
Fig. 16. Image of methyl orange solution (20 mg L−1) before (a) and after (b) degradation.
Fig. 17
Fig. 17. Dynamic curves of degradation of methyl orange by simple TiO2 and LDHs/LM-TiO2 with various coupling ratios.
Fig. 18
Fig. 18. Degradation of methyl orange by 11% LDHs/LM-TiO2 for 3 consecutive cycles.
Fig. 19
Fig. 19. Diagram illustrating the mechanism of the LDH/LM-TiO2 photocatalytic reaction.
See this image and copyright information in PMC

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