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Controlled Growth of LDH Films with Enhanced Photocatalytic Activity in a Mixed Wastewater Treatment
Zhongchuan Wang 
1
School of Material Science and Engineering, Shandong University of Technology, Zibo 255000, China
2
Laboratory of Functional Molecular and Materials, School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(6), 807; https://doi.org/10.3390/nano9060807
Received: 15 April 2019 / Revised: 16 May 2019 / Accepted: 17 May 2019 / Published: 28 May 2019
(This article belongs to the Special Issue Application and Behavior of Nanomaterials in Water Treatment)
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.
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Keywords:
LDHs; film; mixed wastewater; photocatalytic activity
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MDPI and ACS Style
Wang, Z.; Fang, P.; Kumar, P.; Wang, W.; Liu, B.; Li, J. Controlled Growth of LDH Films with Enhanced Photocatalytic Activity in a Mixed Wastewater Treatment. Nanomaterials 2019, 9, 807.
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