研究报告
李仕友,史冬峰,唐振平,谢水波,刘迎九,凌辉.壳聚糖/氧化石墨烯复合材料吸附U（Ⅵ）的特性与机理[J].环境科学学报,2017,37(4):1388-1395
壳聚糖/氧化石墨烯复合材料吸附U（Ⅵ）的特性与机理
- Characteristics and mechanism of uranium(Ⅵ) adsorption by chitosan/graphene oxide composite
- 基金项目：国家自然科学基金项目（No.11475080，11175081）；高等学校博士点基金项目（No.20134324110003）；湖南省自然科学基金项目（No.2016JJ6125）；湖南省高校创新平台项目（No.13K085，13K086）
- 作者
- 单位
- 李仕友
- 南华大学污染控制与资源化技术湖南省重点实验室, 衡阳 421001
- 史冬峰
- 南华大学污染控制与资源化技术湖南省重点实验室, 衡阳 421001
- 唐振平
- 南华大学污染控制与资源化技术湖南省重点实验室, 衡阳 421001
- 谢水波
- 1. 南华大学污染控制与资源化技术湖南省重点实验室, 衡阳 421001;2. 南华大学铀矿冶生物技术国防重点学科实验室, 衡阳 421001
- 刘迎九
- 南华大学污染控制与资源化技术湖南省重点实验室, 衡阳 421001
- 凌辉
- 南华大学污染控制与资源化技术湖南省重点实验室, 衡阳 421001
- 摘要：采用溶液共混法制备了壳聚糖/氧化石墨烯（CS/GO）复合材料，探讨了GO含量、pH值、CS/GO投加量、时间以及U（Ⅵ）初始浓度等对CS/GO吸附U（Ⅵ）效果的影响.试验结果表明，GO质量分数为40%，pH值为5时吸附效果最好，吸附在5 h达到平衡.准二级动力学模型和Langmuir等温吸附方程可较好地拟合其吸附过程，30℃时饱和吸附量为227.3 mg·g-1.CS/GO对U（Ⅵ）的吸附是自发的吸热反应.SEM、FTIR和XRD分析结果表明，CS/GO表面凹凸不平，羟基和氨基是U（Ⅵ）的主要结合位点.解吸试验结果表明CS/GO具有良好的重复使用性能.
- Abstract：The chitosan/graphene oxide composite was prepared in mix-solution. The effects of graphene oxide concentration, pH value, adsorbent dosage, contact time and initial U(Ⅵ) concentration on the adsorption behavior of chitosan/graphene oxide composite on uranium(Ⅵ) were investigated. The results show that the maximum adsorption capacity was obtained at pH of 5 with 40 wt% of GO. The adsorption equilibrium was obtained at 5 h. The adsorption process were better fitted by pseudo-second-order kinetic model and Langmuir isotherm model, respectively. The maximum adsorption capacity for U(Ⅵ) at 30 ℃ was 227.3 mg·g-1. Thermodynamic study revealed that the adsorption of U(Ⅵ) on CS/GO was spontaneous and endothermic. SEM images illustrate that CS/GO had a rough surface and an uneven porous structure. FTIR spectra demonstrated that hydroxyl and amine groups were the main binding sites of U(Ⅵ) in CS/GO. Desorption experiments results indicate that the adsorbent had a good property for reuse.
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