Optical and Photocatalytic Properties of In-Situ Gr@ZnO Microspindle Composites Prepared by Hydrothermal Method

Author:

Anh Luu Thi Lan1,Neto Mateus Manuel1,Thang Pham Van1,Mai Nguyen Thi Tuyet2,Sang Nguyen Xuan3,Tu Nguyen Cong1

Affiliation:

1. School of Engineering Physics, Hanoi University of Science and Technology, 100000, Hanoi, Viet Nam

2. School of Chemical Engineering, Hanoi University of Science and Technology, 100000, Hanoi, Viet Nam

3. Department of Electronics and Telecommunications, Saigon University, 700000, Ho Chi Minh City, Viet Nam

Abstract

In-Situ composite materials of graphene (Gr) and ZnO microspindle with different Gr contents (1, 2 and 5 wt.%) were prepared via a facile one-step hydrothermal route with the assistance of hexamethylenetetramine. Graphene does not affect the hexagonal wurtzite crystal structure of composite materials but strongly affects the morphological, structural, optical and photocatalytic properties of composite materials. In detail, Gr causes a decrease in both the dimensions of ZnO microspindle and photoluminescence efficiency. The average crystalline size and microstrain first increase from 28.9 nm and 0.00394 to 49.5 nm and 0.00524 when Gr content increases from 0 to 1 wt.%, respectively; then decrease to 39.6 nm and 0.00404 when Gr content increase from 1 to 5 wt.%, respectively. Both pristine and composite materials show high photocatalytic activity with high methylene blue degradation efficiency?more than 90%-just after 40 min under UV irradiation. Composite material having a Gr content of 5 wt.% shows the highest degradation efficiency of 96.5% which confirms the role of Gr in enhancing the photocatalytic activity of ZnO.

Publisher

American Scientific Publishers

Subject

Condensed Matter Physics,General Materials Science,Biomedical Engineering,General Chemistry,Bioengineering

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