Inhibition of Nano-Metal Oxides on Bromate Formation during Ozonation Process

Abstract

Simulation studies in pure water were conducted to investigate the effect of nano-metal oxides on bromate (BrO 3 − ) formation as catalysts and the catalytic mechanism. Results indicated that compared to ozonation alone, both nano-SnO 2 and nano-TiO 2 could inhibit the formation of bromate during ozonation process. The inhibition efficiency of BrO 3 − formation by nano-TiO 2 enhanced with the increasing of ozone dosage and the decreasing of nano-TiO 2 dosage, Br − concentrations and the pH value. Possible BrO 3 − minimization mechanism was that nano-TiO 2 accelerated the decomposition of the dissolved O 3 into OH radicals, which rapidly generated H 2 O 2 , and reduced HOBr/OBr − to Br − .

Advances in Treatment of Brominated Hydrocarbons by Heterogeneous Catalytic Ozonation and Bromate Minimization

“…Wu et al [27] conducted simulation studies to investigate the influence of nano-metal oxides, SnO2 and TiO2 on bromate generation in pure water during ozone treatment. Their results showed that ozonation in the presence of nano-metal oxides (SnO2 and TiO2) as catalysts, minimized BrO3− generation to a greater extent, compared to single ozonation.…”

“…Wu et al [27] monitored BrO3− formation at different pH values during single ozonation and ozonation with nano-TiO2. Their results indicated that ozonation with nano-TiO2 favoured the formation of BrO3− as solution pH increased initially from 6.0 to 7.9.…”

“…Wu et al [27] examined BrO3− formation for various initial Br− concentrations during single ozonation and ozonation with nano-TiO2. The data indicated that in single ozonation BrO3− yield increased rapidly as a function of initial Br− concentration, however in ozonation with nano-TiO2 the BrO3− yield was significantly lower.…”

“…Generally, the bromate yield increases as a function of catalyst dose. For example, bromate production with increasing nano-TiO2 dosage (0 to 200 ppm) investigated by Wu et al [27] showed that when nano-TiO2 dose was increased from 0 to 100 ppm, the BrO3− reduction rate increased from 0% to 72.59%. However, when nano-TiO2 dose increased from 100 to 200 ppm, the BrO3− reduction rate only went up to 74.27%.…”

Study on the friction properties of nanocopper oxide/fluorosilicone rubber

“…Among them, nanozinc oxide, nanotitanium dioxide, nanomagnesium oxide, and other nanosized metal oxides of the main element of the second cycle and the third cycle of the subgroup elements have a wider application range and greater influence. [19][20][21][22] Rao et al 23 found that the mechanical properties of polyvinyl alcohol composite film with copper oxide nanoparticles as filler were enhanced.…”