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Photocatalytic activity of Hemin (Fe(III) porphyrin) anchored BaTiO3 under the illumination of visible light: synergetic effects of photosensitization, photo-Fenton & photocatalysis processes
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2017-10-23 00:00:00 , DOI: 10.1039/c7qi00590c L. Gomathi Devi 1, 2, 3, 4, 5 , P. M. Nithya 1, 2, 3, 4, 5
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2017-10-23 00:00:00 , DOI: 10.1039/c7qi00590c L. Gomathi Devi 1, 2, 3, 4, 5 , P. M. Nithya 1, 2, 3, 4, 5
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The photocatalytic activity of Hemin (Fe(III) porphyrin) anchored BaTiO3 (HBTO) under the illumination of visible light was studied. The average crystallite sizes obtained from PXRD were 42.88 nm and 40.32 nm for BaTiO3 (BTO) and HBTO, respectively. The higher lattice strain values for the HBTO photocatalyst confirms the anchoring of hemin on BTO. The interaction of carboxylate groups of the hemin molecule with –OH groups, which are invariantly present on the surface of BTO through O–C–O–Ti bond, was confirmed by FTIR study. The observed XPS shift in the binding energy values of HBTO can be attributed to the anchoring of the hemin molecule to metal ions as well as due to the interaction with delocalized π-electrons of the porphyrin moiety. HBTO showed 33% decrease in the photoluminescence emission, implying less recombination of photogenerated charge carriers. This could be due to the efficiency of non-radiative electron-transfer through ISC from the excited singlet to the triplet state in the case of HBTO. The synergetic effects of various processes like photosensitization, formation of reactive singlet oxygen and the redox reactions involving iron in the +2 and +3 oxidation states were responsible for the extensive photonic efficiency of HBTO particularly in the presence of H2O2.
中文翻译：
可见光照射下的Hemin（Fe（III）卟啉）锚固的BaTiO 3的光催化活性：光敏化，光芬顿和光催化过程的协同效应
研究了可见光照射下的Hemin（Fe（III）卟啉）锚定的BaTiO 3（HBTO）的光催化活性。通过PXRD获得的BaTiO 3的平均微晶尺寸为42.88 nm和40.32 nm（BTO）和HBTO。HBTO光催化剂的较高晶格应变值证实了血红素在BTO上的锚固。FTIR研究证实了血红素分子的羧酸盐基团与–OH基团之间的相互作用，后者始终通过O–C–O–Ti键存在于BTO表面。观察到的HBTO结合能值的XPS位移可归因于血红素分子对金属离子的锚定以及归因于与卟啉部分的离域π电子的相互作用。HBTO显示光致发光发射减少了33％，这意味着光生电荷载流子的重组较少。这可能是由于在HBTO情况下，通过ISC从激发单重态到三重态的非辐射电子转移效率高。2 O 2。
更新日期：2017-11-08
中文翻译：
可见光照射下的Hemin（Fe（III）卟啉）锚固的BaTiO 3的光催化活性：光敏化，光芬顿和光催化过程的协同效应
研究了可见光照射下的Hemin（Fe（III）卟啉）锚定的BaTiO 3（HBTO）的光催化活性。通过PXRD获得的BaTiO 3的平均微晶尺寸为42.88 nm和40.32 nm（BTO）和HBTO。HBTO光催化剂的较高晶格应变值证实了血红素在BTO上的锚固。FTIR研究证实了血红素分子的羧酸盐基团与–OH基团之间的相互作用，后者始终通过O–C–O–Ti键存在于BTO表面。观察到的HBTO结合能值的XPS位移可归因于血红素分子对金属离子的锚定以及归因于与卟啉部分的离域π电子的相互作用。HBTO显示光致发光发射减少了33％，这意味着光生电荷载流子的重组较少。这可能是由于在HBTO情况下，通过ISC从激发单重态到三重态的非辐射电子转移效率高。2 O 2。
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