表面亲水改性GO的制备及其对铬离子的吸附性能

Preparation of surface hydrophilic modified graphene oxide and its adsorption capability for chromium ions

利用不同浓度NaOH水热处理GO,将其表面疏水性的环氧基团转化为亲水性的—OH和—ONa基团,得到表面亲水性的GONaOH。GONaOH呈多孔结构,改性有效地改善了GO材料的比表面积。进一步系统研究了各因素对表面改性GONaOH吸附性能的影响。研究结果表明,以20 mg 2 mol/L NaOH改性处理的GONaOH为吸附剂,pH=5条件下对200 mL 50 mg/L铬离子吸附性能达到305.3 mg/g,约为未经改性处理的GO的3倍。

Using NaOH with different concentrations for the hydrothermal treatment of grapheme oxide（GO）, with which the hydrophobic epoxy group could be converted into hydrophilic —OH and —ONa group, GONaOH with good dispersibility and surface hydrophilicity in aqueous solution could thus be prepared. GONaOH exhibits porous structure. The modification of GONaOH has efficiently improved the specific surface area of GO. The influences of various factors on the adsorption capability of surface modified GONaOH have further been studied systematically.The results show that using the GONaOH treated by 20 mg 2 mol/L of NaOH as adsorbent,when pH is 5, the adsorption capability of 200 mL 50 mg/L of chromium ions reaches 305.3 mg/g, which is about 3 times of the unmodified GO.