Photocatalytic study of TiO2 thin films modified with Anderson-type polyoxometalates (Cr, Co and Ni): Experimental and DFT study

被引:9
作者
Diaz-Uribe, Carlos [1 ]
Duran, Freider [1 ]
Vallejo, William [1 ]
Puello, Esneyder [2 ]
Zarate, Ximena [3 ]
Schott, Eduardo [4 ,5 ]
机构
[1] Univ Atlantico, Fac Ciencias Basicas, Grp Invest Fotoquim & Fotobiol, Programa Quim, Puerto Colombia 081007, Colombia
[2] Univ Atlantico, Fac Ciencias Basicas, Grp Invest Oxi Hidrotratamiento Catalit & Nuevos M, Programa Quim, Puerto Colombia 081007, Colombia
[3] Univ Autonoma Chile, Fac Ingn, Inst Ciencias Quim Aplicadas, Ave Pedro Valdivia 425, Santiago, Chile
[4] Pontificia Univ Catolica Chile, Fac Quim & Farm, Ctr Invest Nanotecnol & Mat Avanzados CIEN, Dept Quim Inorgan,Ctr Energia UC, Ave Vicuna Mackenna 4860, Santiago, Chile
[5] Millennium Nucleus Catalyt Proc Sustainable Chem C, Santiago, Chile
关键词
METHYLENE-BLUE; DEGRADATION; ADSORPTION; NANOPARTICLES; PERFORMANCE; COMPLEXES; REMOVAL; PHASE;
D O I
10.1016/j.poly.2022.116253
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
In this work, three Anderson-type polyoxomolybdates (POMs) with general formula (NH4)6-n[XMo6O24H6]- 6+n where X = Co3+, Cr3+, and Ni2+ were deposited on TiO2 thin films Furthermore, the methylene blue (MB) dye adsorption capacity and photocatalytic degradation were studied. Morphological results show that the POMs/TiO2 films have a more heterogeneous surface in terms of particle size and distribution than bare TiO2 films. Optical characterization indicated that the CrMo6/TiO2 material had the lowest band gap energy with a value of 2.8 eV. The adsorption results show that the maximum percentage of MB adsorption was 37 % for NiMo6/TiO2 while bare TiO2 has only 9.2 %. The MB adsorption on POMs-TiO2 was modeled using and the Freundlich model showed the best fit in all studied films for MB removal. The MB photodegradation values shows this tendency 12 % for bare TiO2, 55 % for NiMo6/TiO2, 73 % for NiMo6/TiO2 and, 83 % for CrMo6/ TiO2. Finally, DFT calculations were performed to characterize the geometry and electronic structure of the all compounds studied in this work, with the aim to explain the observed experimental results.
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页数:9
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