石墨烯海绵对重金属铬离子吸附性能的影响

Effect of graphene sponge on adsorption performance of heavy metal chromiumion

为解决重金属对水的污染问题,利用hummers法制得氧化石墨,采用水热还原法制备石墨烯海绵材料,通过SEM、XRD和FT-IR、Raman光谱和氮气吸附脱附等技术表征了石墨烯海绵微观结构,给出水热还原法制备石墨烯海绵较佳的合成条件,研究石墨烯海绵对水中重金属Cr离子的吸附性能。结果表明:石墨烯海绵在中性和酸性条件下对水溶液中Cr离子的吸附性能更好,Langmuir吸附等温线拟合实验数据较好地反映出石墨烯吸附等温过程;石墨烯海绵对水溶液Cr离子的吸附等温速率常数k1为0.81 L/mg,Qe最高为16.97 mg/g。该研究说明石墨海绵材料对水中重金属Cr离子污染物具有理想的吸附性能。

This paper is aimed at addressing the pollution problem of heavy metals in the water system.The study involves preparing graphite oxide using the hummers method;preparing graphene sponge material by the hydrothermal reduction method;characterizing the microstructure of graphene sponge using SEM,XRD,FT-IR,Raman spectroscopy and nitrogen adsorption and desorption techniques;providing the optimal synthesis conditions for the preparation of graphene sponge by hydrothermal reduction method;and thereby identifying the adsorption performance of graphene sponge for heavy metal Cr ions in water.The results show that graphene sponge offers a better adsorption performance for Cr ions in aqueous solution under neutral and acidic conditions;the better fitting between Langmuir adsorption isotherm and experimental data gives a better reflection of the adsorption isotherm process of grapheme;and the rate constant k1(0.81 L/mg),and the highest Qe(16.97 mg/g)are observed in adsorption isotherm of graphene sponge for Cr ion from aqueous solution.It follows that the graphite sponge material promises an ideal adsorption performance for heavy metal Crion pollutants in water.