FeS/壳聚糖基碳气凝胶复合材料的制备及对Cr(Ⅵ)的吸附  

Preparation and Cr(Ⅵ) adsorption properties of FeS/chitosan-basedcarbon aerogel composites

作　　者：常娟 程爱华[1] CHANG Juan;CHENG Aihua(College of Geology and Environment,Xi’an University of Science and Technology,Xi’an 710054,Shaanxi,China)

机构地区：[1]西安科技大学地质与环境学院,陕西西安710054

出　　处：《化工进展》2023年第11期6042-6052,共11页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金青年项目(52206277)。

摘　　要：以壳聚糖为前体材料,通过溶胶-凝胶、冷冻干燥、碳化等方法制备FeS/壳聚糖基碳气凝胶复合材料(FeS/CA-0.5)。利用SEM、FTIR、XRD及XPS等方法对FeS/CA-0.5的微观形态和结构进行了表征,考察了FeS/CA-0.5对Cr(Ⅵ)的吸附性能,探究了反应机制。结果表明:FeS/CA-0.5保留壳聚糖基碳气凝胶的结构且成功分散FeS,比表面积大,具有超顺磁性;在100mL 100mg/L的Cr(Ⅵ)溶液中投加0.05g FeS/CA-0.5,pH为2,吸附360min可达到平衡,FeS/CA-0.5对Cr(Ⅵ)的平衡吸附量可达173.84mg/g;吸附过程符合准二级动力学和Langmuir等温吸附模型,颗粒内扩散模型表明FeS/CA-0.5对Cr(Ⅵ)的吸附是多步骤过程,整个吸附过程是自发吸热的;FeS/CA-0.5除铬机制主要是物理吸附、化学吸附及化学还原作用。FeS/CA-0.5在处理含铬废水方面有潜在应用前景。The FeS/chitosan-based carbon aerogel composites(FeS/CA-0.5)were prepared by sol-gel method,freeze-drying and high temperature carbonization method using chitosan as raw material.The surface morphology and structure of FeS/CA-0.5 composites were characterized by scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS).The effects of FeS/CA-0.5 on adsorption capacity of Cr(Ⅵ)were studied to investigate the reaction mechanism using Cr(Ⅵ)as the target pollutant.The results showed that FeS/CA-0.5 retained the structure of chitosan-based carbon aerogel and successfully dispersed FeS with a large specific surface area.FeS/CA-0.5 was magnetic.The adsorption capacity of Cr(Ⅵ)on FeS/CA-0.5 could reach 173.84mg/g at 100mL concentration of 100mg/L solution adsorbent dosing of 0.05g,pH of 2,a reaction time of 360min.The adsorption process conformed to quasi-secondary kinetics and the Langmuir isothermal adsorption model.The in-particle diffusion model indicated that the adsorption of Cr(Ⅵ)by FeS/CA-0.5 was a multi-step process and the whole adsorption process was spontaneous endothermic.The mechanism of chromium removal by FeS/CA-0.5 mainly involved physical adsorption,chemical adsorption and chemical reduction.The method of removal of Cr(Ⅵ)in wastewater by FeS/CA-0.5 had a promising application.

关 键 词：生物质碳气凝胶 硫化铁 复合材料 吸附 六价铬 

分 类 号：TB332[一般工业技术—材料科学与工程] X703.1[环境科学与工程—环境工程]