化工进展 ›› 2023, Vol. 42 ›› Issue (11): 6042-6052.DOI: 10.16085/j.issn.1000-6613.2022-2333

• 资源与环境化工 • 上一篇    

FeS/壳聚糖基碳气凝胶复合材料的制备及对Cr(Ⅵ)的吸附

常娟(), 程爱华()   

  1. 西安科技大学地质与环境学院,陕西 西安 710054
  • 收稿日期:2022-12-19 修回日期:2023-02-19 出版日期:2023-11-20 发布日期:2023-12-15
  • 通讯作者: 程爱华
  • 作者简介:常娟(1997—),女,硕士研究生,研究方向为水处理技术。E-mail:876474652@qq.com
  • 基金资助:
    国家自然科学基金青年项目(52206277)

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

CHANG Juan(), CHENG Aihua()   

  1. College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, Shaanxi, China
  • Received:2022-12-19 Revised:2023-02-19 Online:2023-11-20 Published:2023-12-15
  • Contact: CHENG Aihua

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0.05gFeS/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。

关键词: 生物质碳气凝胶, 硫化铁, 复合材料, 吸附, 六价铬

Abstract:

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() 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() 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.

Key words: biomass carbon aerogel, FeS, composites, adsorption, Cr(Ⅵ)

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