氧化石墨烯对水中内分泌干扰物双酚A的吸附性能(英文)

Elimination of Bisphenol A from Water via Graphene Oxide Adsorption

以氧化石墨烯(GO)为吸附剂,内分泌干扰物双酚A(BPA)为目标污染物,考察了GO对水中BPA的吸附性能.结果表明:GO对BPA的最大吸附量(qm)约为87.80mg·g-1(25℃),30min左右即可达到吸附平衡,远快于活性碳;吸附动力学和等温线数据分别符合准二级动力学模型和Langmuir吸附模型;在溶液接近中性和低温的条件下有利于吸附的进行,在溶液中存在电解质的条件下不利于吸附的进行.GO具有优异的循环吸附性能,经过多次循环使用后依然可以保持良好的吸附能力.GO对BPA的吸附机理主要是由于GO本身的片状结构以及表面的含氧极性基团,会与BPA之间产生π-π色散作用和氢键作用.虽然GO对BPA的吸附能力不如石墨烯,但是相比于石墨烯,GO表面含有大量极性基团,具有良好的亲水性,且GO合成方法相对简单,可批量生产用于工业污水处理.因此,在水处理领域,GO有能力成为新型高效的吸附剂.

The elimination of bisphenol A（BPA） from aqueous solution by adsorption on graphene oxide（GO） was investigated.The maximum adsorption capacity（q m） of GO for BPA estimated from the Langmuir isotherm was 87.80 mg·g-1 at 25 ℃.The required contact time to reach adsorption equilibrium was about 30 min,which was much shorter than that of activated carbon.The adsorption kinetics and isotherm data fitted well with the pseudo-second-order kinetic model and the Langmuir isotherm,respectively.Neutral pH and low solution temperature were favorable for adsorption,whereas the presence of NaCl in the solution was unfavorable.The GO had good recyclability and could be reused several times with a slight decline in adsorption ability.Both hydrogen bonding and π-π interaction were thought to be responsible for the adsorption of BPA on GO.The excellent adsorption capacity and high adsorption rate of GO result from its sheet-like structure and the abundant oxygen-containing groups on its surface.Although q m of GO for BPA is lower than that of graphene,GO has the benefits of large scale production,a hydrophilic surface with plenty of oxygen-containing groups,and good dispersion in water.Therefore,GO can be regarded as a good potential adsorbent for water treatment.