TY - JOUR
T1 - Streptavidin activated hydroxyl radicals enhanced photocatalytic and photoelectrochemical properties of membrane-bound like CaMoO4:Eu3+ hybrid structures
AU - Pavitra, Eluri
AU - Rama Raju, Ganji Seeta
AU - Ghoreishian, Seyed Majid
AU - Bharat, L. Krishna
AU - Dugasani, Sreekantha Reddy
AU - Park, Jin Young
AU - Park, Sung Ha
AU - Yu, Jae Su
AU - Han, Young Kyu
AU - Huh, Yun Suk
N1 - Publisher Copyright:
© The Royal Society of Chemistry 2019.
PY - 2019
Y1 - 2019
N2 - Recently, organic-inorganic hybrid structures have gained significant interest and are considered as an innovative alternative for the development of multifunctional materials. Herein, we report highly reliable and reproducible protein-inorganic hybrid CaMoO4:Eu3+ microstructures as a novel photocatalyst for decontamination of environments using an energy-efficient and cost-effective green synthesis. In this synthesis process, streptavidin (SA) serves as an organic scaffold and builds covalent bonds with the amine groups of the CaMoO4:Eu3+ surface, which leads to the formation of membrane-bound-like structures. Because of the well overlapped absorption bands of tyrosine residues and CaMoO4:Eu3+, SA acts as a sensitizer and transfers more UV energy to the MoO4 moieties of CaMoO4:Eu3+, resulting in an enhanced emission intensity along with a blue shifted absorption spectrum. Compared to the commercial TiO2, the CaMoO4:Eu3+ host and SA modified CaMoO4:Eu3+ microstructures exhibit 145 and 207% higher dye removal efficiencies for methylene blue, signifying their light absorption efficiency and higher number of surface-active sites. After hybridization with SA, the CaMoO4:Eu3+ sample offers more photo-generated electrons to improve the photocatalytic activity along with an enhanced photocurrent density of 0.72 μA cm-2, which is about 1.5 times higher than that of the CaMoO4:Eu3+ host. Moreover, the SA modified CaMoO4:Eu3+ sample displayed excellent photocatalytic stability after 6 reusability cycles. Our synthesis strategy for protein-inorganic hybrid CaMoO4:Eu3+ opens a new avenue for the production of cutting-edge materials for industrial-scale catalysis and solid-state lighting applications.
AB - Recently, organic-inorganic hybrid structures have gained significant interest and are considered as an innovative alternative for the development of multifunctional materials. Herein, we report highly reliable and reproducible protein-inorganic hybrid CaMoO4:Eu3+ microstructures as a novel photocatalyst for decontamination of environments using an energy-efficient and cost-effective green synthesis. In this synthesis process, streptavidin (SA) serves as an organic scaffold and builds covalent bonds with the amine groups of the CaMoO4:Eu3+ surface, which leads to the formation of membrane-bound-like structures. Because of the well overlapped absorption bands of tyrosine residues and CaMoO4:Eu3+, SA acts as a sensitizer and transfers more UV energy to the MoO4 moieties of CaMoO4:Eu3+, resulting in an enhanced emission intensity along with a blue shifted absorption spectrum. Compared to the commercial TiO2, the CaMoO4:Eu3+ host and SA modified CaMoO4:Eu3+ microstructures exhibit 145 and 207% higher dye removal efficiencies for methylene blue, signifying their light absorption efficiency and higher number of surface-active sites. After hybridization with SA, the CaMoO4:Eu3+ sample offers more photo-generated electrons to improve the photocatalytic activity along with an enhanced photocurrent density of 0.72 μA cm-2, which is about 1.5 times higher than that of the CaMoO4:Eu3+ host. Moreover, the SA modified CaMoO4:Eu3+ sample displayed excellent photocatalytic stability after 6 reusability cycles. Our synthesis strategy for protein-inorganic hybrid CaMoO4:Eu3+ opens a new avenue for the production of cutting-edge materials for industrial-scale catalysis and solid-state lighting applications.
UR - http://www.scopus.com/inward/record.url?scp=85073621212&partnerID=8YFLogxK
U2 - 10.1039/c9ta08211e
DO - 10.1039/c9ta08211e
M3 - Article
AN - SCOPUS:85073621212
SN - 2050-7488
VL - 7
SP - 23105
EP - 23120
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 40
ER -