Removal of Rhodamine B from aqueous solutions by magnetic biochar activated persulfate
XIANGLI Peng, CUI Jia-li, ZHANG Feng, LI Hong-yan, CUI Jian-guo, WEI Liu-yi
Municipal Engineering Graduate Education Innovation Center of Shanxi Province, College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Abstract：The magnetic CoFe2O4/biochar (MPBC) derived from pine needles was prepared by a sol-gel method. The structure and surface physical-chemical properties of as-prepared MPBC was characterized by X-ray diffraction (XRD), Fourier transform infrared spectrometer (FT-IR), scanning electron microscopy (SEM), specific surface area analyzer (BET), X-ray photoelectron spectrometer (XPS) and vibrating sample magnetometer (VSM). The MPBC was used to activate peroxynitrite (PS) for Rhodamine B (RhB) removal. The results showed that under the optimal conditions of initial RhB concentration of 40mg/L, initial pH value of 5, temperature of 25℃, MPBC dosage of 8.0g/L and PS dosage of 0.05mol/L, the removal rate of RhB reached 98.8% after 120min. The removal rate of RhB tended to increase with the increasing of MPBC dosage and initial RhB concentration, and was effective in a wide range of pH value from 3 to 11. Humic acid, NO3-, HCO3- and Cl- inhibited the removal efficiency of RhB. Free radical quenching experiments and electron paramagnetic resonance (EPR) tests exhibited that the active species including SO4·-, ·OH, 1O2 and ·O2- played a dominating role in the MPBC-PS system. The saturation magnetization intensity of MPBC measured by VSM was 23.41 emu/g, indicating that it was easy to be magnetically recovered. After 5 cycles of reuse, the RhB removal rate still reached 95.4%, showing good stability.
相里鹏, 崔佳丽, 张峰, 李红艳, 崔建国, 韦柳益. 磁性生物炭活化过硫酸盐去除水中罗丹明B[J]. 中国环境科学, 2023, 43(4): 1672-1687.
XIANGLI Peng, CUI Jia-li, ZHANG Feng, LI Hong-yan, CUI Jian-guo, WEI Liu-yi. Removal of Rhodamine B from aqueous solutions by magnetic biochar activated persulfate. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1672-1687.
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