Plasma-induced grafting of polyacrylamide on graphene oxide nanosheets for simultaneous removal of radionuclides
Plasma-induced grafting of polyacrylamide on graphene oxide nanosheets for simultaneous removal of radionuclides
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等离子体诱导聚丙烯酰胺接枝到氧化石墨烯纳米片上同时去除放射性核素
DOI：
10.1039/c4cp04289a
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发表时间：
2015
影响因子：
3.3
通讯作者：
Wang Xiangke
中科院分区：
文献类型：
--
作者：
Song Wencheng;Wang Xiangxue;Wang Qi;Shao Dadong;Wang Xiangke
采用等离子体引发聚合技术制备了聚丙烯酰胺（PAM）接枝氧化石墨烯（PAM/GO），并将其作为吸附剂用于放射性废水中放射性核素的同时去除。研究了PAM/GO与放射性核素U（VI）、Eu（III）和Co（II）的相互作用沿着吸附动力学。结果表明，PAM/GO对放射性核素的吸附受溶液pH和离子强度的影响。在pH = 5.0 ± 0.1和T = 295 K时，U（VI）、Eu（III）和Co（II）在PAM/GO上的最大吸附容量（分别为0.698、1.245和1.621 mmol g−1）远高于放射性核素在GO和其他吸附剂上的最大吸附容量。由吸附等温线计算的热力学数据（Δ H 0、Δ S 0和Δ G 0）表明，放射性核素在PAM/GO上的吸附是一个自发的吸热过程。这些结果表明，PAM/GO是一种很有前途的放射性污染控制材料。
Polyacrylamide (PAM) grafted graphene oxide (denoted as PAM/GO) was synthesized by the plasma-induced polymerization technique and applied as an adsorbent for the simultaneous removal of radionuclides from radioactive wastewater. The interactions of PAM/GO with the radionuclides U(VI), Eu(III) and Co(II) were studied, along with their sorption kinetics. The results indicated that radionuclide sorption on PAM/GO was affected by the solution pH and ionic strength. The maximum sorption capacities of U(VI), Eu(III) and Co(II) on PAM/GO (0.698, 1.245 and 1.621 mmol g−1, respectively) at pH = 5.0 ± 0.1 and T = 295 K were much higher than those of radionuclides on GO and other adsorbents. The thermodynamic data (ΔH0, ΔS0 and ΔG0) calculated from the temperature-dependent sorption isotherms suggested that the sorption of radionuclides on PAM/GO was a spontaneous and endothermic process. These results indicate that PAM/GO is a promising material for the control of radionuclide pollution.