四氧化三铁/氧化石墨烯纳米带复合材料对铀的吸附性能

以高锰酸钾/浓硫酸氧化法轴向切割多壁碳纳米管（MWCNTs）所制备的氧化石墨烯纳米带（GONRs）为原料，采用水热法制备了一种便于固液分离的功能性四氧化三铁/GONRs复合材料（MGONRs），对其进行了SEM、FT-IR、XRD等表征，并考察了其对U(Ⅵ)的吸附性能。探讨了溶液pH值、MGONRs用量、铀初始浓度、吸附时间和温度对MGONRs吸附U(Ⅵ)的影响。结果表明：MGONRs对U(Ⅵ)的吸附过程是与pH值和时间相关的自发的吸热过程；吸附符合准二级动力学模型和Langmuir模型，MGONRs对U(Ⅵ)的吸附量可达123.2 mg/g，且具有良好的再生性能，有望用于从放射性废水中分离和回收铀。

Uranium Adsorption on Ferroferric Oxide/Graphene Oxide Nanoribbon Composite Material

A functional ferroferric oxide/graphene oxide nanoribbons (MGONRs) composite material was synthesized by hrdrothermal method using graphene oxide nanoribbons (GONRs) as raw material which was formed by longitudinal unzipping multi-walled carbon nanotubes (MWCNTs) with KMnO₄ and H₂SO₄. The structure, morphology and property of as-prepared MGONRs were characterized by SEM, FT-IR and XRD, and adsorption behaviors of U(Ⅵ) on as-prepared adsorbents were investigated by varying pH, adsorbent dosage, contact time, initial uranium concentration and temperature. The results show that U(Ⅵ) adsorption on MGONRs was pH-dependent, endothermic, spontaneous and a pseudo-second order process. Higher temperature is beneficial to the U(Ⅵ) adsorption. The adsorption process obeys Langmuir isotherm model, and has the maximum adsorption capacity of 123.2 mg/g and good regeneration performance. MGONRs could have practical application in separation and recovery of uranium from radio-wastewater.