Photocatalytic Degradation of Phenol with Bacteriorhodopsin Sensitized TiO&lt;sub&gt;2&lt;/sub&gt; Nanoparticles

Dai, Gang; Chao, Luo Meng; Iwasa, Takeshi

doi:10.4028/www.scientific.net/amr.955-959.415

Cited by 3 publications

(2 citation statements)

References 9 publications

(8 reference statements)

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“…As a matter of fact, films of bR resist to thermal, electrical and also mechanical stress [10][11][12][13][14] and show a substantial photocurrent when irradiated by a visible (green) light [10,12,16]. Therefore, bR can be used as an optoelectrical switch, to convert radiant energy into electrical energy [15], in pollutants remediation systems [17], to produce optical memories [18], to control neuronal and tissue activity [19,20], etc.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms responsible for the photocurrent in bacteriorhodopsin

Alfinito

Reggiani

2015

Phys. Rev. E

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Recently, there has been growing interest in the electrical properties of bacteriorhodopsin (bR), a protein belonging to the transmembrane protein family. Several experiments pointed out the role of green light in enhancing the current flow in nanolayers of bR, thus confirming potential applications of this protein in the field of optoelectronics. By contrast, the mechanisms underlying the charge transfer and the associated photocurrent are still far from being understood at a microscopic level. To take into account the structure-dependent nature of the current, in a previous set of papers we suggested a mechanism of sequential tunneling among neighboring amino acids. As a matter of fact, when irradiated with green light, bR undergoes a conformational change at a molecular level. Thus, the role played by the protein tertiary-structure in modeling the charge transfer cannot be neglected. The aim of this paper is to go beyond previous models, in the framework of a new branch of electronics we call proteotronics, which exploits the ability of using proteins as reliable, well-understood materials for the development of novel bioelectronic devices. In particular, the present approach assumes that the conformational change is not the unique transformation the protein undergoes when irradiated by light. Instead, the light can also promote an increase of the protein state free energy that, in turn, should modify its internal degree of connectivity. This phenomenon is here described by the change of the value of an interaction radius associated with the physical interactions among amino acids. The implemented model enables us to achieve a better agreement between theory and experiments in the region of a low applied bias by preserving the level of agreement at high values of applied bias. Furthermore, results provide new insights on the mechanisms responsible for bR photoresponse.

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Section: Introductionmentioning

confidence: 99%

Mechanisms responsible for the photocurrent in bacteriorhodopsin

Alfinito

Reggiani

2015

Phys. Rev. E

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“…The interest in the structure and function of a given protein is crossing the boundaries of biology, joining to electronics, applied physics and engineering. This relevant example of cross-fertilization is due to the quest of finding new and more efficient materials to produce green and renewable fuels [1,2], to reduce wasting [3], to design highly specific prostheses for medicine [4,5], to insure human and animal safety [6,7]. Proteins perform in vivo activities that, when introduced in electronic devices, should allow astonishing performances [8,9].…”

Section: Introductionmentioning

confidence: 99%

Current-voltage characteristics of seven-helix proteins from a cubic array of amino acids

Alfinito

Reggiani

2016

Phys. Rev. E

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The electrical properties of a set of seven-helix transmembrane proteins, whose space arrangement (3d structure) is known, are investigated by using regular arrays of the amino acids. These structures, specifically cubes, have topological features similar to those shown by the chosen proteins. The theoretical results show a good agreement between the predicted current-voltage characteristics obtained from a cubic array and those obtained from a detailed 3D structure. The agreement is confirmed by available experiments on bacteriorhodopsin. Furthermore, all the analyzed proteins are found to share the same critical behaviour of the voltage-dependent conductance and of its variance. In particular, the cubic arrangement evidences a short plateau of the excess conductance and its variance at high voltages. The results of the present investigation show the possibility to predict the I-V characteristics of multiple-protein sample even in the absence of a detailed knowledge of their 3D structure.

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Microbiorhodopsin a powerful candidate for a photosensitizer of the TiO₂-based pollutant degradation system

Melissa

Bayaritu

Yang

et al. 2021

IOP Conf. Ser.: Earth Environ. Sci.

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Bacteriorhodopsin (BR) is a light driven proton pump firstly found in the membrane of Halobacterium salinarum. Because of its high quantum efficiency, high stability under harsh conditions and many interesting photochemical properties, BR was shown to be able to enhance the performance of TiO2 materials in TiO2-based solar cell, photocatalytic water splitting and photocatalytic degradation of pollutants. However, high cost of the preparation of the BR restricts its industrial application. Although numerous attempts have been made, E. coli-expression system of the BR, which is most economic and fast way to prepare proteins, has not been developed yet. In the present work, we successfully expressed BR homolog, Archaerhodopsin (AR) found in a Halorubrum species by E. coli-expression system. The E. coli expressed AR retained its photoactivity and showed similar photoreaction properties as that of BR. The E. coli expressed AR might be an excellent candidate for a photosensitizer of the TiO2-based solar energy conversion system.

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Photocatalytic Degradation of Phenol with Bacteriorhodopsin Sensitized TiO<sub>2</sub> Nanoparticles

Cited by 3 publications

References 9 publications

Mechanisms responsible for the photocurrent in bacteriorhodopsin

Mechanisms responsible for the photocurrent in bacteriorhodopsin

Current-voltage characteristics of seven-helix proteins from a cubic array of amino acids

Microbiorhodopsin a powerful candidate for a photosensitizer of the TiO₂-based pollutant degradation system

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Photocatalytic Degradation of Phenol with Bacteriorhodopsin Sensitized TiO<sub>2</sub> Nanoparticles

Cited by 3 publications

References 9 publications

Mechanisms responsible for the photocurrent in bacteriorhodopsin

Mechanisms responsible for the photocurrent in bacteriorhodopsin

Current-voltage characteristics of seven-helix proteins from a cubic array of amino acids

Microbiorhodopsin a powerful candidate for a photosensitizer of the TiO2-based pollutant degradation system

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Product

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Microbiorhodopsin a powerful candidate for a photosensitizer of the TiO₂-based pollutant degradation system