期刊
ENVIRONMENTAL ENGINEERING RESEARCH
卷 25, 期 4, 页码 536-544出版社
KOREAN SOC ENVIRONMENTAL ENGINEERS
DOI: 10.4491/eer.2019.232
关键词
Alkaline activation; Adsorption; Magnetic biochar; Rhodamine B; Rice straw
资金
- National Natural Science Foundation of China [41807379]
- Applied Basic Research Foundation of Science and Technology Department of Sichuan Province [2019YJ0340]
- Fundamental Research Foundation of China West Normal University [18B022, 17E053]
- Meritocracy Research Foundation of China West Normal University [17YC143]
- National Training Programs of Innovation and Entrepreneurship for Undergraduates [201810638013]
- Program for Team Scientific Research and Innovation of China West Normal University [CXTD2018-13, CXTD2017-2]
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, pi-pi 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.
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