Xiong Pan, Xu Siming, Yang Tongtong, Jing Keju
Department of Chemistry and Applied Chemistry, Changji University, Xinjiang 831100, China.
Department of Chemical and Biochemical Engineering and the Key Lab for Synthetic Biotechnology of Xiamen City, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
ACS Omega. 2021 Oct 21;6(43):28813-28827. doi: 10.1021/acsomega.1c03639. eCollection 2021 Nov 2.
Reduced graphene oxide (RGO)-TiO nanocomposites have exhibited effective photocatalytic degradation of various organic pollutants. However, their poor solubility could limit their application in water and other organic solvents. In this study, new graphene-based cross-linked ethylenediaminetetraacetic acid (EDTA)-RGO-TiO (ERGT) nanocomposites were synthesized for the removal of Cd(II) and photodegradation of phenol from wastewater by surface-functionalized cross-linking heavy metal chelating agent sodium edetate (EDTA) and photocatalyst titanium dioxide. The structural properties of fabricated nanocomposites were characterized using SEM, TEM, XPS, FTIR, XRD, UV-vis, gas sorption, and Raman spectroscopy analyses. Moreover, the adsorption of Cd(II) and the degradation of phenol under different conditions were studied. The experimental results revealed that the optimal catalytic degradation and adsorption performance could be achieved at pH 5.5, and the maximum absorption ratio of cadmium ions and the degradation efficiency of phenol can reach 178.2 mg/g and 90%, respectively. The results suggested that ERGT is a potential material for the removal of threatening pollutants from wastewater.
还原氧化石墨烯（RGO）-TiO纳米复合材料已表现出对各种有机污染物的有效光催化降解性能。然而，它们较差的溶解性可能会限制其在水和其他有机溶剂中的应用。在本研究中，通过表面功能化交联重金属螯合剂乙二胺四乙酸钠（EDTA）和光催化剂二氧化钛，合成了新型的基于石墨烯的交联乙二胺四乙酸（EDTA）-RGO-TiO（ERGT）纳米复合材料，用于去除废水中的Cd（II）以及光降解苯酚。使用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、紫外可见光谱（UV-vis）、气体吸附和拉曼光谱分析对制备的纳米复合材料的结构性质进行了表征。此外，还研究了不同条件下Cd（II）的吸附和苯酚的降解情况。实验结果表明，在pH 5.5时可实现最佳的催化降解和吸附性能，镉离子的最大吸附率和苯酚的降解效率分别可达178.2 mg/g和90%。结果表明，ERGT是一种从废水中去除有害污染物的潜在材料。
