Department of Chemistry, Tsinghua University, Beijing 100084, China.
Langmuir. 2012 Jun 5;28(22):8418-25. doi: 10.1021/la301476p. Epub 2012 May 18.
The decontamination of bisphenol A (BPA) from aqueous solution by graphene adsorption was investigated. The maximum adsorption capacity (q(m)) of graphene for BPA obtained from a Langmuir isotherm was 182 mg/g at 302.15 K, which was among the highest values of BPA adsorption compared with other carbonaceous adsorbents according to the literature. Both π-π interactions and hydrogen bonds might be responsible for the adsorption of BPA on graphene, and the excellent adsorption capacity of graphene was due to its unique sp(2)-hybridized single-atom-layer structure. Therefore, graphene could be regarded as a promising adsorbent for BPA removal in water treatment. The kinetics and isotherm data can be well described by the pseudo-second-order kinetic model and the Langmuir isotherm, respectively. The thermodynamic studies indicated that the adsorption reaction was a spontaneous and exothermic process. Besides, the presence of NaCl in the solution could facilitate the adsorption process, whereas the alkaline pH range and higher temperature of the solution were unfavorable.
采用石墨烯吸附法研究了水溶液中双酚 A（BPA）的脱除。从朗缪尔等温线得出，石墨烯对 BPA 的最大吸附容量（q(m)）在 302.15 K 时为 182 mg/g，根据文献报道，这是 BPA 吸附值最高的碳质吸附剂之一。π-π 相互作用和氢键可能是 BPA 在石墨烯上吸附的原因，而石墨烯优异的吸附能力归因于其独特的 sp(2)-杂化单层原子结构。因此，石墨烯可以被视为水处理中去除 BPA 的一种很有前途的吸附剂。动力学和等温线数据可以分别用伪二阶动力学模型和朗缪尔等温线很好地描述。热力学研究表明，吸附反应是一个自发的放热过程。此外，溶液中存在 NaCl 可以促进吸附过程，而溶液的碱性 pH 范围和较高的温度则不利于吸附。
