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

Lookup NU author(s): Professor David WernerORCiD



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


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 di erent 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 toinvestigate the effciency 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 effciency 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 effciency increased accordingly. In contrast, when the dose of nZVI was increased beyond a certain value thenits color removal effciency 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 effciency.

Publication metadata

Author(s): Trinh BS, Le PTK, Werner D, Phuong NH, Luu TL

Publication type: Article

Publication status: Published

Journal: Processes

Year: 2019

Volume: 7

Issue: 10

Online publication date: 27/09/2019

Acceptance date: 16/09/1978

Date deposited: 29/09/2019

ISSN (electronic): 2227-9717

Publisher: MDPI AG


DOI: 10.3390/pr7100660


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