Enhanced removal of Nickel (II) from aqueous solutions by SDS-functionalized graphene oxide

Adsorption experiments were conducted by stirring known amounts of Graphene Oxide (GO)
or SDS-functionalized Graphene Oxide (GO-SDS) (ranging from 10 to 100 mg) with 25 mL of aqueous Ni (II) solutions (at concentrations ranging from 5 to 40 mg/L) for predetermined time intervals at room temperature (298 K).The concentrations of the Ni (II) solutions were measured by Inductively Coupled Plasma
Optical Emission Spectroscopy (ICP-OES / UNICAM 701 Series Emission Spectrometer) and
a UV-Visible spectrophotometer (Cary 100 UV-Vis) by applying the Dimethylglyoxime method [28]. Fourier transform infrared (FTIR) spectra of the samples were recorded with a Varian 800 FTIR spectrometer

本研究通过室温（298 K）下搅拌已知量的氧化石墨烯（GO）或SDS功能化氧化石墨烯（GO-SDS）（质量范围为10至100毫克）与25毫升不同浓度的水溶性Ni（II）溶液（浓度范围为5至40毫克/升）进行吸附实验。Ni（II）溶液的浓度通过电感耦合等离子体光学发射光谱法（ICP-OES / UNICAM 701系列发射光谱仪）以及紫外-可见分光光度计（Cary 100 UV-Vis）并采用二甲基乙二醛法[28]进行测定。样品的傅里叶变换红外光谱（FTIR）由Varian 800 FTIR光谱仪记录。