研究报告

  • 耿旭,杨明.新型Ag(I)选择性吸附材料的制备及吸附性能研究[J].环境科学学报,2017,37(9):3381-3389

  • 新型Ag(I)选择性吸附材料的制备及吸附性能研究
  • Synthesis and adsorption properties of sulfydryl-functionalized chitosan/graphene oxide composite for selective adsorption of Ag(I) ions from aqueous solution
  • 基金项目:中央高校基本科研业务费专项资金(No.15D110556,15D122802)
  • 作者
  • 单位
  • 耿旭
  • 1. 东华大学环境科学与工程学院, 上海 201620;2. 东华大学分析测试中心, 上海 201620
  • 杨明
  • 1. 东华大学环境科学与工程学院, 上海 201620;2. 东华大学分析测试中心, 上海 201620
  • 摘要:将壳聚糖(CTS)、氧化石墨烯(GO)、3-巯基丙基三甲氧基硅烷(MPTMS)交联制得巯基改性壳聚糖-氧化石墨复合材料(SFCG).采用傅里叶变换红外光谱仪、扫描电子显微镜、元素分析仪对改性前后和吸附前后的材料进行表征.研究吸附剂投加量、温度、时间、初始浓度对吸附效果的影响.实验结果表明,SFCG与CTS相比结构发生很大变化,呈现薄层状结构,表面有褶皱.SFCG能够在短时间内选择性高效吸附Ag(I),最大吸附量为578.41 mg·g-1.通过吸附等温线、吸附动力学、吸附热力学的研究发现,其吸附等温线符合Langumir吸附模型,为单层吸附;吸附过程符合准二级动力学模型,以化学吸附为主,同时吸附过程是自发的、放热的.另外,银是一种贵金属,因此,SFCG将在废水处理和回收贵金属等方面均表现出良好的应用前景.
  • Abstract:Sulfydryl-functionalized chitosan/graphene oxide composite was synthesized by using (3-Mercaptopropyl) trimethoxysilane (MPTMS), chitosan and graphene oxide in two steps. Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and elemental analysis (EA) were used to characterize its intermediate and product during its synthesis. The effect of chemical amount, temperature, time and the concentration of adsorbate on adsorption efficiency were investigated to assess its adsorption properties for Ag(I) ions in aqueous solution. The results reveal that the layered structure of the composite has wrinkles on its surface. It can selectively adsorb Ag (I) ions in a short time and the maximum adsorption capacity is 578.41 mg·g-1. The adsorption kinetics follows both pseudo-second-order and Langmuir isotherm model, which indicates that the adsorption is chemical adsorption and monolayer adsorption, respectively. In addition, the adsorption was spontaneous and exothermic. Therefore, the composite will have broad application prospect in environmental cleanup and recovery of precious metal.

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