Wang Zhongchuan, Fang Pengfei, Kumar Parveen, Wang Weiwei, Liu Bo, Li Jiao
School of Material Science and Engineering, Shandong University of Technology, Zibo 255000, China.
Laboratory of Functional Molecular and Materials, School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, China.
Nanomaterials (Basel). 2019 May 28;9(6):807. doi: 10.3390/nano9060807.
Due to multiple charge transport pathways, adjustable layer spacing, compositional flexibility, low manufacturing cost, and absorption of visible light, layered double hydroxides (LDHs) are a promising material for wastewater treatment. In this study, LDH films and Fe-doped LDH films with different metal ions (Ni, Al, Fe) on the surface of conductive cloth were successfully prepared and applied for the photocatalytic degradation of wastewater containing methyl orange and Ag ions under visible-light irradiation. The chemical state of Fe ions and the composition of LDHs on methyl orange photodegradation were investigated. The experimental results showed that LDH films exhibited high photocatalytic activity. The photocatalytic activity of LDH films on methyl orange improved in the mixed wastewater, and the Fe-doped NiAl-LDH films exhibited best visible-light photocatalytic performance. The analysis showed that Ag ions in the mixed wastewater were reduced by the LDH films and subsequently deposited on the surface of the LDH films. The Ag nanoparticles acted as electron traps and promoted the photocatalytic activity of the LDH films on methyl orange. Thus, we have demonstrated that prepared LDH films can be used in the treatment of mixed wastewater and have broad application prospects in environmental remediation and purification processes.
由于具有多种电荷传输途径、可调节的层间距、成分灵活性、低制造成本以及对可见光的吸收，层状双氢氧化物（LDHs）是一种很有前景的废水处理材料。在本研究中，成功制备了在导电布表面带有不同金属离子（镍、铝、铁）的LDH薄膜和铁掺杂LDH薄膜，并将其应用于可见光照射下对含甲基橙和银离子废水的光催化降解。研究了铁离子的化学状态以及LDHs对甲基橙光降解的组成。实验结果表明，LDH薄膜表现出高光催化活性。在混合废水中，LDH薄膜对甲基橙的光催化活性有所提高，且铁掺杂的NiAl-LDH薄膜表现出最佳的可见光光催化性能。分析表明，混合废水中的银离子被LDH薄膜还原，随后沉积在LDH薄膜表面。银纳米颗粒充当电子陷阱，促进了LDH薄膜对甲基橙的光催化活性。因此，我们证明了制备的LDH薄膜可用于混合废水处理，在环境修复和净化过程中具有广阔的应用前景。
