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Open AccessTechnical Note

Rice Husk Biochars Modified with Magnetized Iron Oxides and Nano Zero Valent Iron for Decolorization of Dyeing Wastewater

1
Institute for Environment and Resources, Vietnam National University Ho Chi Minh city, Ho Chi Minh city 75308, Viet Nam
2
Ho Chi Minh city University of Technology, Vietnam National University Ho Chi Minh city, Ho Chi Minh city 72506, Viet Nam
3
School of Engineering, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
4
Tay Nguyen University, Buon Ma Thuot city 63000, Viet Nam
5
Department of Mechatronics and Sensor Systems Technology, Vietnamese-German University; Binh Duong 75000, Viet Nam
*
Author to whom correspondence should be addressed.
Processes 2019, 7(10), 660; https://doi.org/10.3390/pr7100660
Received: 4 August 2019 / Revised: 15 September 2019 / Accepted: 16 September 2019 / Published: 27 September 2019
(This article belongs to the Special Issue Wastewater Treatment Processes)
This study investigated if biochar, a low-cost carbon-rich material, can be modified with reactive materials for decolorization of dyeing wastewater. Two types of rice husk biochars were produced by using different processes of gasification and pyrolysis in limited air condition. The biochars were first magnetized and then modified with nano-scale zero-valent iron (nZVI) to achieve the final products of magnetic-nZVI biochars. Batch experiments were conducted to investigate the efficiency of the modified biochars for reducing color of the reactive dyes yellow (RY145), red (RR195), and blue (RB19) from dyeing solutions. Results showed that color removal efficiency of the modified biochars was significantly enhanced, achieving the values of 100% for RY145 and RR195 and ≥65% for RB19, while the effectiveness of the original biochar was significantly lower. In addition, with increasing dose of the modified biochars, the color removal efficiency increased accordingly. In contrast, when the dose of nZVI was increased beyond a certain value then its color removal efficiency decreased accordingly. It is reported that the magnetic-nZVI rice husk biochars effectively removed the reactive dyes. The impregnation of nZVI particles on the biochar surface spatially separates the nZVI particles, prevents its aggregation and therefore enhances the decolorization efficiency. View Full-Text
Keywords: biochar; full-scale gasification; pyrolysis; rice husk; nano zero-valent iron biochar; full-scale gasification; pyrolysis; rice husk; nano zero-valent iron
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MDPI and ACS Style

Trinh, B.-S.; Le, P.T.K.; Werner, D.; Phuong, N.H.; Luu, T.L. Rice Husk Biochars Modified with Magnetized Iron Oxides and Nano Zero Valent Iron for Decolorization of Dyeing Wastewater. Processes 2019, 7, 660.

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