Abstract
Degradation activity of plasma catalysis between dielectric barrier discharge (DBD) and carbon nanotubes-graphene-nickel foam (CNTs-G-Nif) has been studied in treatment of dye wastewater. CNTs-G-Nif was prepared through a two-step chemical vapor deposition (CVD) approach. The composite has been characterized by different techniques such as X-ray diffraction (XRD), scanning electron microscope (SEM) and Raman spectroscopy. SEM results showed that the Nif as the growth substrate was evenly wrapped by G and then CNTs were successfully grown on G as the support. The growth mechanism of composite was proposed. The possible coupled catalytic mechanism between DBD and CNTs-G-Nif were addressed. In addition, the modification on G-Nif was found by SEM during the discharge process in liquid phase. And the modification mechanism of DBD plasma (DBDP) acting on composites was discussed. Finally, by means of analyses of ultraviolet-visible (UV-Vis) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-mass spectrometry (LC-MS), the general degradation pathway and stepwise degradation pathways of alizarin green (AG) were proposed in detail.
Highlights
With high chroma, large displacement, high content of electrolyte and complex composition, the printing and dyeing wastewater was considered as the most pernicious industrial wastewater
Few black dots could be found on the surface of carbon nanotubes (CNTs)-G-Nif, which illustrated that G-Nif was completely covered with CNTs
On account of the effect in the atmosphere of DBD plasma (DBDP), dye molecules adsorbed on the surface of CNTs were in an excited state to originate photoinduced electron which would firstly transfer to carbon tube, and transfer to Ni substrate step by step following energy level
Summary
Large displacement, high content of electrolyte and complex composition, the printing and dyeing wastewater was considered as the most pernicious industrial wastewater. The samples were taken from the degradation process of AG under DBDP/CNTs-G-Nif. The UV-Vis spectrum was determined by using Shimadzu UV-1601PC UV-Vis Scanning Spectrophotometer with the wavelength ranging from 200 to 800 nm.
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