摘要 采用加热蒸发法制备了载铁氧化石墨烯壳聚糖(Fe-GOCS)复合球,对合成材料进行了表征,研究其对吸附Cr(Ⅵ)的影响因素。结果表明,随pH的降低,Fe-GOCS对Cr(Ⅵ)的吸附量增加。准1级动力学模型可用于描述0~10 h对Cr(Ⅵ)的吸附动力学过程,而10~45 h阶段对Cr(Ⅵ)的吸附符合准2级动力学方程。随环境温度的升高,FeGOCS对Cr(Ⅵ)吸附容量变大,吸附过程为自发的吸热反应,并符合Sips和Langmuir吸附等温线模型,对Cr(Ⅵ)的最大吸附量可达141.5 mg/g。材料经过5次吸附-解吸附后,对Cr(Ⅵ)的平衡吸附容量仍有77.2 mg/g。傅立叶红外光谱和X射线衍射仪证明Fe-GOCS上的-NH——2和负载的铁氧化物参与了Cr(VI)的吸附。 The iron-loaded graphene oxide chitosan(Fe-GOCS) composite balls were prepared by heating evaporation and the prepared materials were characterized,its influence factors on the adsorption of Cr(Ⅵ) were studied.The results showed that the adsorption of Cr(Ⅵ) by Fe-GOCS increased with the decrease of pH.The adsorption kinetics of Cr(Ⅵ) followed the pseudo-first-order model at 0~10 h,while at 10~45 h followed the pseudosecond-order model.The adsorption capacity of Cr(Ⅵ) by Fe-GOCS increased with the increase of ambient temperature,and the whole adsorption process was a spontaneous endothermic reaction,which confirmed to the Sips and Langmuir adsorption isotherm model,the maximum adsorption capacity of Cr(Ⅵ) could reach 141.5 mg/g.After 5 times of adsorption-desorption of the material,the equilibrium adsorption capacity for Cr(Ⅵ) was still 77.2 mg/g.The Fourier infrared spectroscopy and X-ray diffractometer showed that-NH2 and supported iron oxide on Fe-GOCS participated in the adsorption of Cr(Ⅵ).
出处 《水处理技术》 CAS CSCD 北大核心 2021年第4期45-51,共7页 Technology of Water Treatment
基金 国家自然科学基金项目(41877194,41502232) 广西自然科学基金(2017GXNSFAA198096)。
分类号 TQ424 [化学工程]
