Enhanced removal of organic pollutant by separable and recyclable rGH-PANI/BiOI photocatalyst via the synergism of adsorption and photocatalytic degradation under visible light

doi:10.1016/j.jmst.2020.08.046

Abstract

Abstract:

A novel three-dimension separable and recyclable rGH-PANI/BiOI photocatalyst with the synergism of adsorption-enrichment and photocatalytic-degradation was successfully prepared via a facile three-step hydrothermal method. The three-dimension reduced graphene oxide hydrogel (rGH) in with flower-like BiOI photocatalyst uniformly distributed not only possesses excellent adsorption and electron transport properties, but also is easy to be separated from water for recycling. In addition, polyphenylamine (PANI) provides superior hole transport ability due to its delocalized π-π conjugate structure. The cooperation of rGH and PANI greatly enhances the separation efficiency of photogenerated carriers, and finally improves the photocatalytic degradation behaviors. The removal rates of Rhodamine B (RhB) by rGH-PANI/BiOI-70 % composite under visible light respectively reach 100 % and 50.13 % in static and dynamic systems, which are 12.85 and 3.58 times of BiOI, respectively. The removal rate does not show decrease after 5 recycles indicating the excellent separable and recyclable property of rGH-PANI/BiOI photocatalyst. The work provides an essential reference for designing and constructing hydrogel-based ternary composite photocatalysts with excellent synergism of adsorption and photocatalysis, which shows great potential in the treatment of water pollution.

Key words: Reduced graphene oxide hydrogel, Synergism, Adsorption-enrichment, Photocatalytic-degradation, Separable, Recyclable

Xin Wang, Jiaqian Zhu, Xiang Yu, Xionghui Fu, Yi Zhu, Yuanming Zhang. Enhanced removal of organic pollutant by separable and recyclable rGH-PANI/BiOI photocatalyst via the synergism of adsorption and photocatalytic degradation under visible light[J]. J. Mater. Sci. Technol., 2021, 77: 19-27.

Figures/Tables 13

Scheme 1. Schematic illustration of the synthetic process of rGH-PANI/BiOI composite.

Fig. 1. XRD patterns of BiOI, PANI/BiOI, rGH-BiOI and rGH-PANI/BiOI.

Fig. 2. (a) FT-IR spectra of BiOI, PANI/BiOI, rGH-BiOI and rGH-PANI/BiOI; (b) Raman spectra of GO, rGH, and rGH-PANI/BiOI.

Fig. 3. (a, b) Real images of rGH-PANI/BiOI hydrogel; SEM images of (c) BiOI; (d) PANI/BiOI and (e) rGH-PANI/BiOI; (f) TEM image of rGH-PANI/BiOI.

Fig. 4. High-resolution XPS spectra of rGH-PANI/BiOI: (a) survey spectra; (b) I 3d; (c) C 1s; (d) N 1s.

Fig. 5. (a) UV-vis DRS of BiOI, PANI/BiOI, rGH-BiOI and rGH-PANI/BiOI; (b) the plot of (αhυ)1/2 versus (hυ) for BiOI.

Fig. 6. (a) Photocatalytic performances for BiOI, PANI/BiOI (PB), rGH-BiOI (GB) and rGH-PANI/BiOI (GPB) (λ > 420 nm) in static system; (b) the corresponding rate constantsk.

Fig. 7. The recycling photocatalytic tests of rGH-PANI/BiOI-70 %.

Fig. 8. Schematic illustration of the dynamic system.

Fig. 9. The adsorption and photocatalytic behaviors in dynamic system. (a) Adsorption-photocatalytic behaviors of RhB by rGH-PANI/BiOI-70 % with different flow rates; (b) Adsorption behaviors of RhB by BiOI, PANI/BiOI-8 %, rGH-BiOI-70 % and rGH-PANI/BiOI-70 % with 0.4 mL/min flow rate; (c) Adsorption and adsorption-photocatalytic behaviors of RhB by rGH-PANI/BiOI-70 % with 0.4 mL/min flow rate; (d) Adsorption-photocatalytic behaviors of RhB by BiOI, PANI/BiOI-8 %, rGH-BiOI-70 % and rGH-PANI/BiOI-70 % with 0.4 mL/min flow rate.

Fig. 10. (a) Photocurrent responses of BiOI, PANI/BiOI, rGH-BiOI and rGH-PANI/BiOI; (b) Magnified view of their transient photocurrent responses of BiOI and PANI/BiOI; (c) Electrochemical impedance spectroscopy of different samples with the frequency from 100 kHz to 0.01 Hz (inset is the corresponding magnified view); (d) photoluminescence spectra of different samples.

Fig. 11. Radical-trapping test for photocatalytic degradation of RhB over rGH-PANI/BiOI-70 % composite in the static system.

Fig. 12. The photodegrating mechanism diagram of rGH-PANI/BiOI under the visible-light irradiation.

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