Wang Zhongchuan, Zhang Luyao, Fang Pengfei, Wang Lu, Wang Weiwei
School of Material Science and Engineering, Shandong University of Technology, Zibo 255049, China.
ACS Omega. 2020 Aug 18;5(34):21805-21814. doi: 10.1021/acsomega.0c02875. eCollection 2020 Sep 1.
Herein, nickel-aluminum-layered double hydroxide (NiAl-LDH) films were prepared by the hydrothermal method. Based on the photoinduced reduction ability and degradation of LDHs on heavy metal ions and organic compounds, NiAl-LDH films displayed favorable simultaneous removal performance. Benefiting from the electron traps of heavy metals reduced from solution, the coexisting metal ions improved the photocatalytic activity of NiAl-LDH films on methyl orange. The higher the Fermi level of coexisting metal ion was, the higher the photocatalytic degradation rate of methyl orange obtained. Meanwhile, the removal rates of heavy metal ions (Ag, Pb, and Cu) from wastewater were both enhanced and could reach 95%. NiAl-LDH films showed affinity toward Ag. Furthermore, NiAl-LDH films are tightly coupled with the substrate, providing active sites and a simple method for the catalyst recovery. This study provides new insights into the simultaneous removal of heavy metal ions and organic pollutants using LDH films.
在此，通过水热法制备了镍铝层状双氢氧化物（NiAl-LDH）薄膜。基于层状双氢氧化物对重金属离子和有机化合物的光致还原能力及降解作用，NiAl-LDH薄膜展现出良好的同步去除性能。受益于从溶液中还原的重金属的电子陷阱，共存金属离子提高了NiAl-LDH薄膜对甲基橙的光催化活性。共存金属离子的费米能级越高，获得的甲基橙光催化降解速率越高。同时，废水中重金属离子（Ag、Pb和Cu）的去除率均得到提高，可达95%。NiAl-LDH薄膜对Ag表现出亲和力。此外，NiAl-LDH薄膜与基底紧密耦合，为催化剂回收提供了活性位点和简便方法。本研究为使用LDH薄膜同步去除重金属离子和有机污染物提供了新的见解。
