磁性稻壳生物炭对水体中菲的去除特性  

Characteristics of removing phenanthrene (PHE) from water by magnetic rice husk biochar

作　　者：赵旭 王淑娟 郭伟 魏立帅[4] 施胜利 李一平[1,2] ZHAO Xu;WANG Shujuan;GUO Wei;WEI Lishuai;SHI Shengli;LI Yiping(Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes,Ministry of Education,Hohai University,Nanjing 210098,China;College of Environment,Hohai University,Nanjing 210098,China;School of Environmental Science and Engineering,North ChinaElectric Power University,Beijing 102206,China;State Key Laboratory of Alternate Electrical Power System withRenewable Energy Sources,North China Electric Power University,Beijing 102206,China;Beijing Key Laboratory of NewTechnique in Agricultural Application,Beijing University of Agriculture,Beijing 102206,China)

机构地区：[1]河海大学浅水湖泊综合治理与资源开发教育部重点实验室,江苏南京210098 [2]河海大学环境学院,江苏南京210098 [3]华北电力大学环境科学与工程学院,北京102206 [4]华北电力大学新能源电力系统国家重点实验室,北京102206 [5]北京农学院北京市农业应用新技术重点实验室,北京102206

出　　处：《水资源保护》2019年第5期70-77,共8页Water Resources Protection

基　　金：北京市自然科学基金(8152028);北京市农业应用新技术重点实验室开放项目(5076516003/051)

摘　　要：选取稻壳制备生物炭,通过水热法对其进行磁化改性,分析改性前后生物炭对水体中菲的去除特性,探讨了不同影响因素对水体中菲吸附效果的影响,并借助扫描电镜、傅里叶红外扫描、X射线衍射及X射线光电子能谱技术等手段分析了改性前后生物炭结构特征和吸附机制.结果表明:改性后生物炭的比表面积和吸附点位显著增加,疏水性显著增强;两种生物炭对菲的吸附均符合伪二动力学模型和Langmuir模型,吸附机理均表现为表面官能团吸附和π-π共轭反应,磁改性生物炭对菲的吸附主要发生在C—O和Fe3 O4等官能团上,而改性前则主要发生在—OH、N—H、C—C及C—O等官能团上;与其他生物炭相比,磁性稻壳炭去除水体中菲具有更好的应用前景.A magnetically modified rice husk biochar was successfully prepared by a hydrothermal method and was subsequently used to remove phenanthrene (PHE) from water. The characteristics of removing phenanthrene from water by biochar before and after modification was analyzed. The influence of different factors on the adsorption effect of phenanthrene in water was discussed. SEM, FTIR, XRD and XPS were used to analyze the characteristics of original biochar (BC) and magnetic biochar (MBC) and the adsorption mechanisms. The results showed that the adsorption site, specific surface area and hydrophobic of biochar were significantly improved and enhanced after being modified. The adsorption to PHE by two biochars fitted well to pseudo-second-order kinetic and Langmuir models. The adsorption mechanism of the two biochars were mainly attributed to surface functional groups action and π-π conjugated reactions. The adsorption to PHE by MBC mainly occurred in the functional groups of C-O and Fe3O4, but that by BC was mainly in the functional groups of -OH, N-H, C -C and C-O. Compared with other biochars, MBC has better application prospect in the removal of PHE from water.

关 键 词：磁性生物炭 稻壳 菲 吸附动力学 等温吸附 

分 类 号：TV131.2[水利工程—水力学及河流动力学] X703[环境科学与工程—环境工程]