使用磁性和非磁性稻壳衍生生物炭从水溶液中吸附去除菲
Sorptive removal of phenanthrene from aqueous solutions using magnetic and non-magnetic rice husk-derived biochars.
作者信息
Guo Wei, Wang Shujuan, Wang Yunkai, Lu Shaoyong, Gao Yue
机构信息
School of Environmental Science and Engineering, North China Electric Power University, Beinong Road 2, Beijing 102206, People's Republic of China.
National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Research Centre of Lake Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, People's Republic of China.
出版信息
R Soc Open Sci. 2018 May 30;5(5):172382. doi: 10.1098/rsos.172382. eCollection 2018 May.
A magnetically modified rice husk biochar (MBC) was successfully prepared by a hydrothermal method from original biochar (BC) and subsequently used to remove phenanthrene (PHE) from aqueous solutions. The porosity, specific surface area and hydrophobicity of BC were significantly improved (approx. two times) after magnetic modification. The adsorption data fitted well to pseudo-second-order kinetic and Langmuir models. Compared with BC, MBC had a faster adsorption rate and higher adsorption capacity of PHE. The adsorption equilibrium for PHE on MBC was achieved within 1.0 h. The maximum adsorption capacity of PHE on MBC was 97.6 mg g based on the analysis of the Sips model, which was significantly higher than that of other sources of BCs. The adsorption mechanism of the two BCs was mainly attributed to the action of surface functional groups and π-π-conjugated reactions. The adsorption of PHE on MBC mainly occurred in the functional groups of C-O and FeO, but that on BC was mainly in the functional groups of -OH, N-H, C=C and C-O.
通过水热法由原始生物炭（BC）成功制备了磁性改性稻壳生物炭（MBC），并随后用于从水溶液中去除菲（PHE）。磁性改性后，BC的孔隙率、比表面积和疏水性显著提高（约两倍）。吸附数据与伪二级动力学模型和朗缪尔模型拟合良好。与BC相比，MBC对PHE的吸附速率更快，吸附容量更高。MBC对PHE的吸附在1.0小时内达到平衡。基于Sips模型分析，MBC对PHE的最大吸附容量为97.6 mg/g，显著高于其他来源的BC。两种BC的吸附机制主要归因于表面官能团的作用和π-π共轭反应。PHE在MBC上的吸附主要发生在C-O和FeO官能团中，而在BC上的吸附主要发生在-OH、N-H、C=C和C-O官能团中。
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