Synthesis of Nano-Flakes Ag•ZnO•Activated Carbon Composite from Rice Husk as A Photocatalyst under Solar Light

*Anh-Tuan Vu  -  School of Chemical Engineering, Hanoi University of Science and Technology, Viet Nam
Thi Anh Tuyet Pham  -  School of Chemical Engineering, Hanoi University of Science and Technology, Viet Nam
Thi Thuy Tran  -  School of Chemical Engineering, Hanoi University of Science and Technology, Viet Nam
Xuan Truong Nguyen  -  School of Chemical Engineering, Hanoi University of Science and Technology, Viet Nam
Thu Quynh Tran  -  School of Chemical Engineering, Hanoi University of Science and Technology, Viet Nam
Quang Tung Tran  -  School of Chemical Engineering, Hanoi University of Science and Technology, Viet Nam
Trong Nghia Nguyen  -  School of Chemical Engineering, Hanoi University of Science and Technology, Viet Nam
Tuan Van Doan  -  R&D Research Center, Kangaroo Headquarter, Viet Nam
Thao Duong Vi  -  R&D Research Center, Kangaroo Headquarter, Viet Nam
Cong Long Nguyen  -  Hepato-Gastroenterology Department, Bach Mai Hospital, Viet Nam
Minh Viet Nguyen  -  Hanoi University of Industry, Viet Nam
Chang-Ha Lee  -  Department of Biomolecular and Chemical Engineering, Yonsei University, Korea, Republic of
Received: 25 Sep 2019; Revised: 2 Feb 2020; Accepted: 4 Feb 2020; Published: 1 Apr 2020; Available online: 28 Feb 2020.
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Abstract

This study aimed to synthesize Ag•ZnO•Activated carbon (Ag•ZnO•AC ) composite from rice husk for degradation of dyes. The deposition of Ag and ZnO on AC led to decreasing the surface area and pore volume of Ag•ZnO•AC composite. In addition, when Ag and ZnO were dispersed on activated carbon, the Ag•ZnO flakes became denser and tighter, but the particle size of Ag became smaller from 5 to 7 nm. The photocatalytic ability of Ag•ZnO•AC composite was evaluated by degradation of Janus Green B (JGB) and compared with that of AC, ZnO, Ag•ZnO, and ZnO•AC samples. The effects of catalyst dosages, pH values, and initial dye concentrations on photocatalytic degradation were investigated in detail. The Ag•ZnO•AC composite had a high degradation efficiency of 100% in 60 min, showing the reaction rate of 0.120 min-1 and degradation capacity of 17.8 mg/g within 20 min. The photocatalytic performance of the Ag•ZnO•AC composite was also evaluated by cyclic test and the degradation of other persistent dyes such as Methylene Blue, Tartrazine, Congo Red, and organic compounds (Caffeine and Bisphenol A). Based on the experimental results, the possible destruction route of JGB by the as-synthesized Ag•ZnO•AC composite was suggested. Copyright © 2020 BCREC Group. All rights reserved

 

Keywords
Rice husk; Silver; Zinc oxide; Activated carbon; Photocatalyst

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