水中苯酚和邻苯二酚在磁性氧化石墨烯表面的吸附

使用制备的磁性氧化石墨烯纳米复合材料研究其对水中苯酚和邻苯二酚的吸附行为。系统考察接触时间、溶液酸碱条件、离子强度等因素对磁性氧化石墨烯吸附苯酚和邻苯二酚的影响。利用吸附等温线和吸附动力学探讨吸附机理和可能的吸附控速步骤。结果表明，磁性氧化石墨烯对苯酚和邻苯二酚的吸附量随时间变化不断增加，60 min为适宜的吸附时间。过大的无机盐离子强度会降低磁性氧化石墨烯对苯酚和邻苯二酚的吸附。磁性氧化石墨烯适合在弱酸性条件下对苯酚和邻苯二酚进行吸附。吸附等温线的结果表明，苯酚和邻苯二酚在磁性氧化石墨烯上的吸附行为可用Langmuir型等温方程描述。磁性氧化石墨烯吸附苯酚符合准一级动力学模型，而磁性氧化石墨烯吸附邻苯二酚符合准二级动力学模型。

Adsorption of Phenol and Catechol on the Magnetic Graphene Oxide in Aqueous Solution

The adsorption behavior of phenol and catechol on the magnetic graphene oxide (MGO) nano-composites in aqueous solution was investigated, including effects of contact time, acid or base conditions and ionic strength, and the adsorption mechanism was studied by the adsorption isotherm and adsorption kinetics analysis. The results show that the adsorption capacity increases with contact time (maximum at 60 minutes), and excessive inorganic salt ionic strength reduces the adsorption capacity. Moreover, it is found that MGO has a higher adsorption capacity under weak acidic conditions. The adsorption isotherms show that the adsorption behavior of phenol and catechol on MGO follows the Langmuir isotherm equation. Specifically, the adsorption process of phenol is well fitted to the pseudo first order kinetic model, and the adsorption process of catechol is well fitted to the pseudo second order kinetic model.