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Fig 1.

N2 adsorption and desorption isotherms at 77 K onTiO2 and PoPD/TiO2.

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Fig 1 Expand

Fig 2.

SEM images of (a-b) TiO2 and (c-d) PoPD/TiO2 nanocomposites.

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Fig 2 Expand

Fig 3.

TEM images of (a-b) TiO2 and (c-d) PoPD/TiO2 nanocomposites.

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Fig 4.

XRD pattern of TiO2 and PoPD/TiO2 nanocomposites.

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Fig 5.

FT-IR spectra of TiO2, PoPD, and PoPD/TiO2 nanocomposites.

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Fig 5 Expand

Fig 6.

TGA curves of (a) TiO2 and (b) PoPD/TiO2 nanocomposites.

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Fig 7.

XPS spectra of TiO2 and PoPD/TiO2 nanocomposites.

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Fig 8.

UV-Vis DRS of TiO2 and PoPD/TiO2 nanocomposites.

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Fig 8 Expand

Fig 9.

Photocurrent density of TiO2 and PoPD/TiO2 nanocomposites under visible light irradiation.

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Fig 10.

Results of degrading MB using different (a) molar ratios of oPD to TiO2 nanocomposites, (b) the concentration of hydrochloric acid, and (c) the molar ratio of APS to oPD.

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Fig 10 Expand

Table 1.

Apparent first-order rate constants (kapp) of MB degradation and linear regression coefficients from -ln(C/C0) = kappt.

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Table 1 Expand

Fig 11.

Photocatalytic degradation rate of MB with PoPD/TiO2 nanocomposites in different recycling time.

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Fig 11 Expand

Fig 12.

(a) FT-IR spectra and (b) XRD patterns of PoPD/TiO2 nanocomposites before and after photocatalytic reaction.

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Fig 12 Expand

Fig 13.

Photocatalytic mechanism of PoPD/TiO2 nanocomposites to enhance photocatalytic activity under visible light irradiation.

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Fig 13 Expand