| 郭丰艳,刘迎,金昌磊.果胶@生物炭-Fe3O4的制备及其对Cu2+的吸附性能[J].唐山学院学报,2020,32(6):24-30 |
| 果胶@生物炭-Fe3O4的制备及其对Cu2+的吸附性能 |
| Making of Pectin @ Biochar Fe3O4 and Its Adsorption Property for Cu2+ |
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| DOI：10.16160/j.cnki.tsxyxb.2020.06.006 |
| 中文关键词: 果胶 生物炭 Fe3O4 Cu2+ 吸附性能 |
| 英文关键词: pectin biochar Fe3O4 Cu2+ adsorption property |
| 基金项目:唐山市科技计划项目（17130253a）；2020年河北省高等学校科学技术研究指导项目（Z2020130） |
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| 中文摘要: |
| 以木屑为原料，高温热解制备生物炭。以聚乙烯醇为粘结剂，采用混合法将生物炭与果胶复合，并负载磁性，经烘干定型制备果胶包覆的磁性生物炭材料（果胶@生物炭-Fe3O4）。采用扫描电镜（SEM）、X射线衍射（XRD）及N2吸附-脱附（BET）等方法对果胶@生物炭-Fe3O4进行表征，结合吸附实验分析其对Cu2+的吸附特性。结果表明，当生物炭、果胶、Fe3O4质量比为5：1：1，溶液pH值为6，吸附24 h，果胶@生物炭-Fe3O4对Cu2+吸附效果最好；二级动力学方程能较好地描述果胶@生物炭-Fe3O4对Cu2+的吸附过程，Freundlich模型能较好地拟合其吸附行为；SEM结果显示该材料具有不规则的孔隙结构；XRD分析显示纳米Fe3O4是其主要的晶体结构；BET测得其比表面积为25.654 m2·g-1，平均孔径为20.18 nm。 |
| 英文摘要: |
| Sawdust is used as a raw material to make biochar by pyrolysis. With polyvinyl alcohol as binder, biochar and pectin are compounded by mixing method. After magnetizing and drying treatment, the magnetic biochar covered by pectin(Pectin @ Biochar Fe3O4) is obtained. Then it is characterized by using scanning electron microscopy (SEM), X-ray diffraction (XRD) and N2 adsorption-desorption (BET). The adsorption property for Cu2+ is analyzed based on the adsorption experiment. The results show that: The adsorption effect of Pectin @ Biochar Fe3O4 can reach its best with the mass ratio of biochar, pectin and Fe3O4 being 5:1:1, pH being 6, and adsorption time being 24 hours; The adsorption process can be well described by second-order kinetic equation and the adsorption behavior can be well fitted by Freundlich model; SEM results show that Pectin @ Biochar Fe3O4 has irregular pore structures, and XRD analysis reveals that nano Fe3O4 is the main crystal structure; Its specific surface area is 25.654 m2·g-1and the average pore diameter is 20.18 nm by BET test. |
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