title: Enhanced ultrasound-assisted degradation of methyl orange and metronidazole by rectorite-supported nanoscale zero-valent iron.
abstract: In this study, the rectorite-supported nanoscale zero-valent iron (nZVI/R) was synthesized through a reduction method. X-ray diffraction analysis showed the existence of the nZVI in the nZVI/R composite and X-ray photoelectron spectroscopy analysis indicated that the nZVI particles were partly oxidized into iron oxide. Scanning electron microscopy analysis revealed that the nZVI particles were highly dispersed on the surface of the rectorite. The specific surface area of the nZVI/R composite is 21.43 m(2)/g, which was higher than that of rectorite (4.30 m(2)/g) and nZVI (17.97 m(2)/g). In the presence of ultrasound (US), the degradation of methyl orange and metronidazole by the nZVI/R composite was over 93% and 97% within 20 min, respectively, which is much higher than that by the rectorite and the nZVI. The degradation ratio of methyl orange and metronidazole by the nZVI/R composite under US was 1.7 and 1.8 times as high as that by the nZVI/R composite without US, respectively. The mechanism of the enhanced degradation of methyl orange and metronidazole under US irradiation was studied. These results indicate that the US/nZVI/R process has great potential application value for treatment of dye wastewater and medicine wastewater.
authors.affiliation: School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, PR China; Hubei Provincial Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources, Wuhan 430070, PR China.
authors.forename: Na
authors.initials: N
authors.lastname: Yuan
authors.affiliation: School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, PR China; Hubei Provincial Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources, Wuhan 430070, PR China. Electronic address: gkzhang@whut.edu.cn.
authors.forename: Gaoke
authors.initials: G
authors.lastname: Zhang
authors.affiliation: School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, PR China; Hubei Provincial Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources, Wuhan 430070, PR China.
authors.forename: Sheng
authors.initials: S
authors.lastname: Guo
authors.affiliation: School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, PR China; Hubei Provincial Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources, Wuhan 430070, PR China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wan
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry*; D001391:Azo Compounds / Q000737:chemistry* / Q000302:isolation & purification; D007501:Iron / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008795:Metronidazole / Q000737:chemistry* / Q000302:isolation & purification; D008903:Minerals / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry; D000069453:Ultrasonic Waves; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D000538:Aluminum Silicates; D001391:Azo Compounds; D008903:Minerals; D014874:Water Pollutants, Chemical; C546376:rectorite; D008795:Metronidazole; C100258:methyl orange; D007501:Iron; D009584:Nitrogen
keywords: Degradation; Nanoscale zero-valent iron; Rectorite; Ultrasound