Fabrication of Fe-POMs as Visible-light-active Heterogeneous Photocatalyst

Abstract

Visible-light-active Fe-POMs was fabricated via precipitating Fe³⁺ with Keggin type polyoxometalates (H₃PW₁₂O₄₀, H₄SiW₁₂O₄₀ or H₃PMo₁₂O₄₀) under solvothermal condition. The as-prepared Fe-POMs were denoted as FePW, FeSiW and FePMo, respectively. Among the three kinds of Fe-POMs, FePMo displayed the highest visible light absorption, the largest specific surface area, the most sensitive photocurrent response and the smallest charge transfer resistance, which were all beneficial for heterogeneous photocatalysis. The efficiency for Cr(VI) reduction was ca. 88% by FePMo after 50 min visible light irradiation. The estimated rate constant(0.042 min⁻¹) was ca. 2.5 and 1.8 times that by FePW and FeSiW, respectively. FTIR spectra indicated that the Keggin structure of PMo₁₂O₄₀ ³⁻ was maintained in FePMo. Mechanism study indicated that the photogenerated electrons in LUMO and the holes in HOMO were thermodynamically feasible for Cr(VI) reduction and H₂O oxidation, respectively. Using FePMo as an optimized photocatalyst, good stability was also observed after 5 cyclic runs in both photocatalytic performance and XRD structure.

Keywords

Cr(VI) reduction / Photocatalysis / Polyoxometalate / FePMo / Visible light

References

[1] Carlos E B, Violeta L, Bryan B. J. Hazard. Mater., 2012, 223/224: 1.

[2] Wang C, Du X, Li J, Guo X, Wang P, Zhang J. Appl. Catal. B: Environ., 201, 193: 198.

[3] Zou Y, Wang X, Khan A, Wang P, Liu Y, Alsaedi A, Hayat T, Wang X. Environ. Sci. Technol., 201, 50: 7290.

[4] Al-Shannag M, Al-Qodah Z, Bani-Melhem K, Qtaishat M R, Alkasrawi M. Chem. Eng. J., 2015, 260: 749.

[5] Fu F, Wang Q. J. Environ. Manage., 2011, 92: 407.

[6] Chen C, Ma W, Zhao J. Chem. Soc. Rev., 2010, 39: 4206.

[7] An X, Tang Q, Lan H, Liu H, Qu J. Appl. Catal. B: Environ., 2019, 244: 407.

[8] Zhang G, Yang W, Wu W, Wu X, Zhang L, Kuang X, Wang S, Lu C. J. Catal., 2019, 369: 54.

[9] Zhao X, Zhang Y, Zhao Y, Tan H, Zhao Z, Shi H, Wang E, Li Y. Dalton Trans., 2019, 48: 6484.

[10] Tang Q, An X, Lan H, Liu H, Qu J. Appl. Catal. B: Environ., 2020, 268: 118394.

[11] Huang Y, Wang R. J. Mater. Chem. A, 2019, 7: 12105.

[12] Liu W, Dong L, Li R, Chen Y, Sun S, Li S, Lan Y. ACS Appl. Mater. Interf., 2019, 11: 7030.

[13] Tangestaninejad S, Mirkhani V, Moghadam M, Mohammadpoor-Baltork I, Shams E, Salavati H. Ultrason. Sonochem., 2008, 15: 438.

[14] Koutsouroubi E D, Xylouri A K, Armatas G S. Chem. Commun., 2015, 51: 4481.

[15] Wang Q, Liu E, Zhang C, Huang S, Cong Y, Zhang Y. J. Colloid. Interf Sci., 2018, 516: 304.

[16] Shi H, Yan G, Zhang Y, Tan H, Zhou W, Ma Y, Li Y, Chen W, Wang E. ACS Appl. Mater. Interfaces, 2017, 9: 422.

[17] Cen Q, Gao Q, Zhang C, Liu Y, Wang Q, Wang Q. J. Colloid Interf. Sci., 2020, 562: 12.

[18] Gao Q, Lin D, Fan Y, He Q, Wang Q. Chem. Eng. J., 2019, 374: 10.

[19] Fournier M, Feumi-Jantou C, Rabia C, Hervé G, Launay S. J. Mater. Chem., 1992, 2: 971.

[20] Al-Garni T, Al-Jallal N, Aouissi A. J. Chem., 2017, 2017: 5641604.

[21] Yin D, Zhang L, Zhao X, Chen H, Zhai Q. Chin. J. Catal., 2015, 36: 2203.

[22] Silva M J, Liberto N A, De Andrade Leles L C, Pereira U A. J. Mol. Catal A: Chem., 201, 422: 69.

[23] Spojakina A, Kraleva E, Jiratova K, Petrov L. Appl. Catal. A: Gen., 2005, 288: 10.

[24] Grosvenor A P, Kobe B A, Biesinger M C, McIntyre N S. Surf. Interface Anal., 2004, 36: 1564.

[25] Phillips D C, Sawhill S J, Self R, Bussell M E. J. Catal., 2002, 207: 266.

[26] Wang Q, Shi X, Xu J, Crittenden J C, Liu E, Zhang Y, Cong Y. J. Hazard. Mater., 201, 307: 213.

[27] Cong Y, Ji Y, Ge Y, Jin H, Zhang Y, Wang Q. Chem. Eng. J., 2017, 307: 72.

[28] Wang Q, Zhu N, Liu E, Fu L, Zhou T, Cong Y. Electrochim. Acta, 201, 216: 266.

[29] Tian H, Araya T, Li R, Fang Y, Huang Y. Appl. Catal. B: Environ., 2019, 254: 371.

[30] Dong G, Zhang Y, Pan Q, Qiu J. J. Photoch. Photobio. C, 2014, 20: 33.

[31] Wu Q, Zhao J, Qin G, Wang C, Tong X, Song X. Appl. Catal. B: Environ., 2013, 142: 142.

[32] Zhao Z, Zhang W, Sun Y, Yu J, Zhang Y, Wang H, Dong F, Wu Z. J. Phys. Chem. C, 201, 120: 11889.

[33] Liu B, Liu X, Liu J, Feng C, Li Z, Li C, Gong Y, Pan L, Xu S, Sun C Q. Appl. Catal. B: Environ., 2018, 226: 234.