氨基修饰氧化石墨烯-羧甲基纤维素复合吸附剂的制备及其对Cr (VI)的吸附性能研究

为获得价格低廉、吸附性能优良的石墨烯基吸附剂，以氧化石墨烯（GO）、羧甲基纤维素（CMC）为基材，以聚乙烯亚胺（PEI）为改性试剂，通过化学修饰的方法制备了氨基修饰氧化石墨烯-羧甲基纤维素复合吸附剂（GO-PEI-CMC）.采用扫描电镜（SEM）、傅里叶红外光谱（FT-IR）及X射线光电子能谱（XPS）等表征手段证实了CMC、氧化石墨烯与PEI已成功复合.静态吸附实验表明GO-PEI-CMC对Cr （VI）表现出良好的吸附性能，由Langmuir等温吸附模型所得最大吸附量值为243.92 mg·g^-1.吸附动力学、吸附等温线研究表明GO-PEI-CMC对Cr （VI）的吸附为单分子层、化学吸附过程.GO-PEI-CMC对Cr （VI）吸附性能优良，且具有绿色环保、可生物降解的优点，是一种极具潜力的Cr （VI）吸附剂.

Preparation of amino modified graphene oxide-carboxymethyl cellulose composite adsorbent and its adsorption performance towards Cr(VI)

In order to obtain graphene-based adsorbents with low price and excellent adsorption performance, amino modified graphene oxide-carboxymethyl cellulose composite adsorbent (GO-PEI-CMC) was prepared by chemical modification with graphene oxide and carboxymethyl cellulose (CMC) as substrates and polyethylenimine (PEI) as modifying reagent. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) were used to characterize GO-PEI-CMC and the results indicated that CMC, graphene oxide and PEI had been successfully compounded. The static adsorption experiment showed that GO-PEI-CMC exhibited good adsorption ability for Cr(VI), and the maximum adsorption capacity calculated by Langmuir isothermal adsorption model was 243.92 mg·g^-1. The adsorption kinetics and isotherm analysis results indicated that the adsorption of Cr(VI) onto GO-PEI-CMC was a monolayer and chemisorption process. GO-PEI-CMC with the characteristic of excellent adsorption performance, environmental protection and biodegradability is a potential adsorbent for the removal of Cr(VI).