Li Jing, Wang Shaoxia, Wang Feng, Wu Xuran, Zhuang Xuming
College of Chemistry and Chemical Engineering, Yantai University Yantai China
RSC Adv. 2019 Jan 21;9(5):2816-2821. doi: 10.1039/c8ra10506e. eCollection 2019 Jan 18.
The excellent adsorption properties of three-dimensional graphene (3DG) can be further enhanced by triethylenetetramine modification to increase its adsorption capacity for precious metal ions. Herein, we successfully synthesized an amino-modified 3DG (N-3DG) adsorbent with improved adsorption conditions with regards to pH value, dosage, and adsorption time. Adsorption equilibrium was reached at pH 3 over 120 min. In addition, the theoretical basis for the adsorption of N-3DG is provided by fitting the adsorption isotherm model. The synthesized material was tested in seawater and lake water samples for the adsorption of precious metals, namely Au(iii) and Pd(ii), achieving a recovery rate of 87% to 106% as assessed by inductively coupled plasma mass spectrometry. Thus, N-3DG showed good adsorptivity. The present results indicate that N-3DG materials could have a viable application in environmental and sewage treatment in the near future.
通过三乙烯四胺改性可以进一步提高三维石墨烯（3DG）优异的吸附性能，以增加其对贵金属离子的吸附容量。在此，我们成功合成了一种氨基改性的3DG（N-3DG）吸附剂，在pH值、用量和吸附时间等吸附条件方面得到了改善。在pH 3时，120分钟内达到吸附平衡。此外，通过拟合吸附等温线模型为N-3DG的吸附提供了理论依据。在海水和湖水样品中测试了合成材料对贵金属Au(iii)和Pd(ii)的吸附性能，通过电感耦合等离子体质谱评估，回收率达到87%至106%。因此，N-3DG表现出良好的吸附性。目前的结果表明，N-3DG材料在不久的将来可能在环境和污水处理中具有可行的应用。
