Comparison between catalytic activities of two zinc layered hydroxide salts in brilliant green organic dye bleaching.
作者： Murilo Gonçalves da Rocha , Shirley Nakagaki , Geani Maria Ucoski , Fernando Wypych , Guilherme Sippel Machado
DOI: 10.1016/J.JCIS.2019.01.111
关键词:
摘要: Abstract This paper reports the use of two layered hydroxide salts (LHS) (zinc nitrate – ZHN Zn5(OH)8(NO3)2·2H2O, and zinc chloride ZHC Zn5(OH)8Cl2·H2O) as catalysts for brilliant green (BG) organic dye bleaching, using hydrogen peroxide oxidant. The LHS were prepared by precipitation reaction between an aqueous solution ammonia solution. solids characterized powder X-ray diffraction (XRD), electron paramagnetic resonance (EPR), ultraviolet-visible electronic spectroscopy (UV–Vis) Fourier-transform infrared (FTIR). catalytic activity was investigated at temperatures 25, 35 45 °C, different molar ratios oxidant:dye:Zn2+ ions (present in catalyst), absence presence ambient light. kinetic aspect considering that showed pseudo-first order behavior relation to BG concentration. We propose a mechanism where superoxide radicals account most bleaching taking place. results obtained, along with low cost toxicity compounds, establish novel wastewater treatment, area constant demand new methods materials given its relationship environmental equilibrium human health.
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