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DOI: https://doi.org/10.4491/eer.2019.232
Magnetic biochar from alkali-activated rice straw for removal of rhodamine B from aqueous solution
Zhaogang Ren1, Fang Chen1, Bin Wang2, Zhongxian Song3, Ziyu Zhou1, and Dong Ren1
1College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China
2School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China
3School of Municipal and Environmental Engineering, Henan University of Urban Construction, Pingdingshan, 467036, China Abstract
Corresponding Author: Dong Ren ,Tel: +86-817-2568646, Fax: +86-817-2568646, Email: dren@cwnu.edu.cn
Received: June 3, 2019;  Accepted: August 7, 2019.
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ABSTRACT
To address organic dye wastewater, economic and effective adsorbents are required. Here, magnetic biochar from alkali-activated rice straw (AMBC) was successfully synthesized using one-step magnetization and carbonization method. The alkaline activation caused the large specific surface area, high pore volume and abundant oxygen-containing groups of the AMBC, and the magnetization gave the AMBC a certain degree of electropositivity and fast equilibrium characteristics. These characteristics collectively contributed to a relative high adsorption capacity of 53.66 mg g−1 for this adsorbent towards rhodamine B (RhB). In brief, RhB can spontaneously adsorb onto the heterogeneous surface of the AMBC and reach the equilibrium in 60 min. Although the initial pH, ionic strength and other substances of the solution affected the adsorption performance of the AMBC, it could be easily regenerated and reused with considerable adsorption content. Based on the results, H-bonds, π–π stacking and electrostatic interactions were speculated as the primary mechanisms for RhB adsorption onto the AMBC, which was also demonstrated by the FTIR analysis. With the advantageous features of low cost, easy separation, considerable adsorption capacity and favorable stability and reusability, the AMBC would be a potential adsorbent for removing organic dyes from wastewater.
Keywords: Adsorption | Alkaline activation | Magnetic biochar | Rhodamine B | Rice straw
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