Degradation of Organic Pollutants in Wastewater by Bicarbonate-Activated Hydrogen Peroxide with a Supported Cobalt Catalyst

Abstract

Developing novel technologies to cleanup wastewater has attracted attention for a long while in academic and industrial communities not only for environmental issues but also for recycling water sources. This work demonstrates that bicarbonate-activated H2O2 can be applied as a novel oxidant source in pollutant degradation. Using a supported cobalt catalyst, bicarbonate-activated H2O2 can efficiently degrade various dyes and phenol at ambient temperature. Because the reaction media remains weakly basic during degradation, the cobalt leaching from the solid catalyst has been efficiently avoided and the lifetime of the catalyst can be extended to above 180 h without significant activity loss in a fixed-bed test. Different scavengers, including ascorbic acid, t-butanol, sodium azide, benzoquinone, and tiron, have been tested to identify the active species, which may be involved in pollutant degradation, and it was found that singlet oxygen and the carbonate radical may play a key role in the degradation process.

Degradation of benzotriazole by a novel Fenton-like reaction with mesoporous Cu/MnO 2 : Combination of adsorption and catalysis oxidation

“…6(A)). Sodium azide (NaN 3 ), which is frequently used for scavenging singlet oxygen [47], also did not quench the reaction. Chloroform (CF) was used an O 2 · − scavenger (k CF, O2·− = 3  10 10 M −1 s −1 ) [50] in this study (Fig.…”

“…Tert-butyl alcohol (TBA) [47] or iodide (I − ) [48] can scavenge any ·OH formed in solution or surface bound. In this study, neither TBA nor I − affected degradation of BZA, indicating that ·OH was not the dominated ROS in the solution or bound on the surface of catalyst in this Fenton-like reaction ( Fig.…”

Controlled leaching with prolonged activity for Co–LDH supported catalyst during treatment of organic dyes using bicarbonate activation of hydrogen peroxide

“…In fixed bed experiments the degradation of dye model compound MB (methylene blue) was carried out in continuous feeding double jacket glass reactor that was described in our previous work [17,18]. A total of 20 g of CoMgAl-Na-Y (2.10% cobalt) was loaded in the reactor.…”

“…Recently bicarbonate activation of hydrogen peroxide (BAP) is reported for various organic pollutants and dyes directly with redox metals [14][15][16], even these practices clearly caused heavy metal pollution. Alternately, bicarbonate activation of hydrogen peroxide with heterogeneous catalyst will be a good choice for degradation of pollutants and our last two publications encouraged us to develop this efficient, durable, and stable treatment system for wastewater with no leaching of catalyst [17,18].…”

In situ generation of hydroxyl radical by cobalt oxide supported porous carbon enhance removal of refractory organics in tannery dyeing wastewater

“…Amongst tertiary treatment processes, advance oxidation processes gained much importance for its high removal efficiency than conventional methods. Fenton oxidation process was found to be most prominent and practicable methods for the treatment of various industrial wastewaters [6]. The main drawback on the practical use of Fenton process was the formation of ferric hydroxide precipitate and acidic conditions for the hydroxyl generation during the organic destruction [7].…”