Luo Hao, Zhang Shengxiao, Li Xiaoyan, Xu Qiang, Liu Junshen, Wang Zhenhua
School of Chemistry and Materials Science, Ludong University, Yantai, 264025, China.
Shandong Analysis and Tester Center, Shandong Academy of Science, Jinan, China.
Environ Sci Pollut Res Int. 2017 Jun;24(18):15599-15608. doi: 10.1007/s11356-017-9207-y. Epub 2017 May 18.
A novel and simple method for preparing magnetic biomass activated carbon (BAC) was developed. The BAC was prepared by decomposing fallen leaves, and magnetic nanoparticles were grown in situ on BAC using solvothermal method. The prepared magnetic BAC was characterized with FT-IR, XRD, vibrating sample magnetometer, thermo-gravimetric apparatus, SEM, and high-resolution transmission electron microscope, and results indicate that BAC and magnetic nanoparticles were combined together successfully. To investigate the adsorption ability of the composites, several dyes were selected as sample pollutants, and the sorbent showed high adsorption capacity for the dyes. The solution pH had no significant effect on the adsorption in the range of 5-9. The adsorption behavior of magnetic BAC for dyes followed the Langmuir isotherm model, and the adsorption capacity of congo red, neutral red, and methyl green were 396.8, 171.2, and 403.2 mg/g, respectively. The maximum adsorption capacity in natural water showed no obvious decrease, indicating the strong anti-interference ability of the sorbents. The Gibbs free energy calculated from the thermodynamics data was negative, demonstrating that the adsorption of these dyes on the magnetic BAC was spontaneous. The magnetic BAC showed a great potential for the removal of dye pollutants from environment water.
开发了一种新颖且简单的制备磁性生物质活性炭（BAC）的方法。通过分解落叶制备BAC，并采用溶剂热法在BAC上原位生长磁性纳米颗粒。利用傅里叶变换红外光谱仪（FT-IR）、X射线衍射仪（XRD）、振动样品磁强计、热重分析仪、扫描电子显微镜（SEM）和高分辨率透射电子显微镜对制备的磁性BAC进行了表征，结果表明BAC与磁性纳米颗粒成功结合。为了研究该复合材料的吸附能力，选择了几种染料作为样品污染物，该吸附剂对染料表现出高吸附容量。在5-9的范围内，溶液pH对吸附没有显著影响。磁性BAC对染料的吸附行为遵循朗缪尔等温线模型，刚果红、中性红和甲基绿的吸附容量分别为396.8、171.2和403.2 mg/g。在天然水中的最大吸附容量没有明显下降，表明吸附剂具有很强的抗干扰能力。根据热力学数据计算的吉布斯自由能为负值，表明这些染料在磁性BAC上的吸附是自发的。磁性BAC在去除环境水中染料污染物方面具有巨大潜力。
