Oxidation and adsorption of arsenic species by means of hybrid polymer containing manganese oxides

Abstract

The aim of this work was a comprehensive study of the oxidative and sorptive properties of a hybrid polymer containing manganese oxide toward As(III) and As(V). A poly(styrene‐divinylbenzene) copolymer containing oxidative functional groups (SO2NBrNa) was used as the supporting material for MnO2. The inorganic component was deposited as a result of the oxidation reaction of Mn(II) with oxidative groups of the host polymer. The surface of the polymer matrix was evenly covered with a thin layer of manganese oxide. The obtained product (R/S/Mn) exhibited high oxidative capacity over a wide pH range (2–12); however, under acidic and neutral conditions, the reaction ran significantly faster. The studied material shows some sorption properties but its sorption capacity is much lower than its oxidation capacity. The treatment, in a column regime, of the arsenic solution containing 1 mg As(III) dm−3 and coexisting ions in concentrations similar to those in natural waters, confirmed the excellent oxidation capacity of the obtained product. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39489.

Iron and aluminium oxides containing industrial wastes as adsorbents of heavy metals: Application possibilities and limitations

“…At the same time, the pH was found to have only a slight effect on the effectiveness of As(III) adsorption, which is probably owing to the substantial manganese(IV) oxide content in the waste. The oxidation of As(III) to As(V) on the surface of manganese(IV) oxide is combined with its reductive dissolution, followed by the adsorption of the reduced Mn 2+ ions on the adsorbent surface whereby its total positive charge is increased, which favours the adsorption of the anions (Lafferty et al, 2011;Ociński et al, 2014;Scott and Morgan, 1995). Water deironing residuals also show a high affinity to cations of heavy metals, such as lead, cadmium, zinc and cobalt (Table 3).…”

Redox polymer with N,N‐dichlorosulfonamide functional groups as arsenite oxidant in aqueous solutions

“…Satisfactory oxidation properties in the wide pH range exhibit hybrid polymers consisting of manganese dioxide deposited within the polymeric skeleton . In the case of such materials the oxidation rate is the highest under acidic and neutral environment, whereas under alkaline conditions this type of heterogeneous oxidants required multiple longer reaction time to ensure adequate effectiveness . However, at neutral pH the hybrid polymer coated with manganese dioxide exhibited the oxidation capacity over twice lower than of the studied R/Cl 2 redox polymer (Table ).…”

“…Because alkaline environment is usually unfavorable for oxidation reactions this inconvenience does not reduce the usability of the R/Cl 2 polymer. Satisfactory oxidation properties in the wide pH range exhibit hybrid polymers consisting of manganese dioxide deposited within the polymeric skeleton . In the case of such materials the oxidation rate is the highest under acidic and neutral environment, whereas under alkaline conditions this type of heterogeneous oxidants required multiple longer reaction time to ensure adequate effectiveness .…”

“…The working oxidation capacity of the hybrid polymer coated with manganese dioxide was much smaller (18.8 mg As g −1 ), but this value was calculated before the breakthrough point of the bed was reached. It is worth mentioning that due to some adsorptive properties of manganese dioxide, the hybrid polymers with MnO 2 deposit can simultaneously play the role of As(III) oxidant and adsorbent . Introduction into such materials both manganese and iron oxides significantly improves their adsorptive properties toward arsenites [13.5 mg As(III) g −1 , 14.5 mg As(V) g −1 ] but simultaneously diminishes the oxidative capacity of the hybrid polymer due to the lower content of manganese oxide .…”

“…The oxidation state of arsenic is then the main factor influencing the effectiveness of most of the technologies used for arsenic removal from water. Hence, intensive research is underway to find new methods for arsenic oxidation, based on heterogeneous or, to a lesser degree, homogeneous oxidants . Attention is also given to the development of photochemical oxidation processes conducted in the presence of TiO 2 or combining hydrogen peroxide/ozone with ultraviolet radiation .…”