Enhanced photocatalytic performance of Hemin (chloro(protoporhyinato)iron(III)) anchored TiO2 photocatalyst for methyl orange degradation: A surface modification method

Abstract

TiO 2 was prepared by sol-gel method through the hydrolysis of TiCl 4 and its surface derivatization was carried out with molecular catalyst like Hemin (chloro(protoporhyinato)iron(III)). Catalyst was characterized by various analytical techniques like UV-vis spectroscopy, FT-IR, FE-SEM and XRD.The anchoring of Hemin on titania surface is confirmed by FT-IR spectra through the linkage of O C O Ti bond and also by TGA-DSC and elemental analysis. The photocatalytic activity of the surface modified catalyst is tested for the degradation of methyl orange (MO) as a model compound under UV light. The Hemin impregnated TiO 2 (H-TiO 2 ) in presence of H 2 O 2 shows an excellent photocatalytic activity compared to pristine TiO 2 , Hemin, H 2 O 2 , TiO 2 /H 2 O 2 , and Hemin/H 2 O 2 systems. The enhancement in the photocatalytic activity is attributed to the presence of iron (III) porphyrin ring on the TiO 2 surface, which reduces the electron-hole recombination rate and also by acting as a mediator for continuous production of enriched concentration of hydroxyl radicals along with various other reactive free radicals.

Preparation of natural pyrite nanoparticles by high energy planetary ball milling as a nanocatalyst for heterogeneous Fenton process

“…This leads to the persisting pollution of the water bodies [2,3]. AO7 is most commonly used as a coloring agent in manufacturing of cosmetic products [5]. A literature survey shows that if the sewage including AO7 release into water effluents it will influence the safety of ecosystems and cause harmful effects on human health and aquatic life [6,7].…”

Co-modification of F− and Fe(III) ions as a facile strategy towards effective separation of photogenerated electrons and holes

“…Therefore, from the view point of the improvement for photocatalytic efficiency, it is crucial to promote the effective separation of photogenerated electrons and holes. [8] In the past decades, various approaches have been developed to address the issue, such as alignment of different semiconductor photocatalysts with desirable matching of the energy band positions, [9][10][11][12][13] sensitization of semiconductor photocatalysts with absorbed molecules or narrow band-gap quantum dots, [14][15][16][17][18][19] and grafting cocatalysts onto the surface of semiconductor photocatalysts. [20][21][22] Amongst them, surface-modification with highly efficient cocatalysts has been considered as one of the most ideal approaches to facilitate the separation of photogenerated electrons and holes and improvement of photocatalytic activities for semiconductor photocatalysts.…”

Hemin Modified TiO2Nanoparticles with Enhanced Photoelectrocatalytic Activity for Electrochemical and Photoelectrochemical Sensing

“…14 Recently, TiO 2 nanomaterials coupled with hemin have been investigated for photocatalytic degradation of organic pollutants 9,11 and photoelectrochemical detection of glutathione. 15 However, these previous reports have only focused on the photocatalytic activity of hemin-TiO 2 composites.…”