GO/CS复合微球的制备及其对Cr(Ⅵ)的吸附性能

Preparation of GO/CS Composite Microspheres and Their Adsorption Properties for Cr(Ⅵ)

重金属六价铬离子对环境有着严重的污染,研发一种高效的吸附剂很有必要。采用相转变法制得壳聚糖/氧化石墨烯复合材料(GO/CS)。通过X-射线衍射仪(XRD)、傅里叶变换红外光谱仪(FT-IR)、扫描电子显微镜(SEM)对微球的结构、表面形貌等进行了表征,并探究了复合微球的滴球温度、吸附剂加入量、Cr(Ⅵ)溶液初始浓度、吸附温度、吸附时间、吸附溶液pH、微球粒径等因素对Cr(Ⅵ)吸附性能的影响。结果表明:在滴球温度为30℃,吸附剂加入量为0.3 g、Cr(Ⅵ)溶液初始浓度为40 mg/L、吸附温度为40℃、吸附时间为120 min、吸附溶液pH=4的条件下,壳聚糖/氧化石墨烯复合微球对Cr(Ⅵ)的吸附性能达到最高,最大吸附率达84.98%。

Heavy metal hexavalent chromium ion has serious pollution to the environment.Therefore,developing a highly effective adsorbent is necessary.In this paper,the method of phase change was used to produce chitosan/graphexe oxide(GO/CS)composite microspheres.The structure and surface morphology of microspheres were characterized by X-ray diffraction(XRD),Fourier transform infrared spectrometer(FT-IR),and scanning electron microscope(SEM).The effects of the composite microsphere′s temperature,the amount of adsorbent,the initial concentration of the solution,the adsorption temperature,the adsorption time,the pH of the adsorption solution,and the particle size of the composite microsphere on the adsorption performance of Cr(Ⅵ)were investigated.The results showed that the drop ball under the temperature of 30℃,the adsorbent amount of 0.3 g,the initial concentration of the Cr(Ⅵ)solution of 40 mg/L,the adsorption temperature of 40℃,the adsorption time of 120 min,pH=4,chitosan/graphene oxide composite ball of Cr(Ⅵ)adsorption performance to achieve the highest and largest adsorption rate was 84.98%.