School of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China.
Environ Sci Pollut Res Int. 2018 Jun;25(16):15651-15661. doi: 10.1007/s11356-018-1733-8. Epub 2018 Mar 25.
A novel adsorbent, three-dimensional porous graphene/lignin/sodium alginate nanocomposite (denoted as 3D PG/L/SA) was fabricated by hydrothermal polymerization of lignin and sodium alginate in the presence of graphene oxide (GO) in an aqueous system. Fourier transform infrared spectra, thermo-gravimetric analysis, scanning electron microscopy, and X-ray photoelectron spectroscopy were employed to characterize the morphology and structure of this novel functional PG/L/SA nanocomposite. A series of adsorption experiments for cleanup of Cd(II) and Pb(II) were conducted to investigate the effects of lignin and sodium alginate on the graphene structure. It was found that PG/L/SA showed a significant increase in adsorption capacity contrast to porous graphene (PG). The as-prepared material achieved the adsorption capacity for Cd(II) and Pb(II) of 79.88 and 226.24 mg/g, respectively. Meanwhile, the adsorption process matched well with the Langmuir isotherm model and the pseudo-second-order kinetic model. Studies were also conducted to demonstrate the applicability of the sorbent to the removal of heavy metal ions from metal smelting wastewater.
一种新型吸附剂，三维多孔石墨烯/木质素/海藻酸钠纳米复合材料（表示为 3D PG/L/SA）是通过在氧化石墨烯（GO）存在下，在水相中聚合木质素和海藻酸钠制备的。傅里叶变换红外光谱、热重分析、扫描电子显微镜和 X 射线光电子能谱用于表征这种新型功能 PG/L/SA 纳米复合材料的形态和结构。进行了一系列用于清除 Cd(II)和 Pb(II)的吸附实验，以研究木质素和海藻酸钠对石墨烯结构的影响。结果表明，PG/L/SA 与多孔石墨烯（PG）相比，吸附容量有显著提高。所制备的材料对 Cd(II)和 Pb(II)的吸附容量分别达到 79.88 和 226.24mg/g。同时，吸附过程符合 Langmuir 等温模型和拟二级动力学模型。还进行了研究，以证明该吸附剂适用于从金属冶炼废水中去除重金属离子。
