H₂O₂/periodate (IO₄⁻): a novel advanced oxidation technology for the degradation of refractory organic pollutants

Abstract

H2O2/periodate: a novel advanced oxidation process.

Removal of persistent textile dyes from wastewater by Fe(ii)/H2O2/H3NOH+ integrated system: process performance and limitations

“…Different oxidants/species have been found to perform a similar role in several degradation situations involving various cOH or SO 4 c À -based AOPs. 3,27,[35][36][37][38][39][40][41] Consequently, an excessive amount of hydroxylamine (>0.5 mM in our case) should be avoided for the best performance of the Fe(II)/ H 2 O 2 /H 3 NOH + integrated process. To conrm the above enhancement/quenching mechanism of NH 3 OH + toward radical generation in the Fe(II)/H 2 O 2 system, additional experimental evidence was added by analyzing the Fe(III) production kinetics in the presence of low (0.01, 0.1 mM) and excess amounts of H 3 NOH + (1 mM) and comparing the obtained evolution with that achieved at 0.5 mM (i.e., the optimal HA concentration, which provided the best improvement in Fe(II)/H 2 O 2 efficiency, Fig.…”

“…EPR and chemical probe techniques are usually employed for determining the reactive species involved in AOPs, 3,38,39,[42][43][44] and both of these techniques provided similar results and conclusions. 42,43 Because of the simplicity of the second one (the chemical probe), it has been adopted in the present study.…”

“…This behavior has been widely reported for a variety of degradation cases involving AOPs. 3,35,37,38,40,41 Consequently, iron(II) and H 2 O 2 concentrations should be applied at optimized doses so as not to restrict the efficiency of the Fe(II)/H 2 O 2 /H 3 NOH + integrated process. The Fenton-H 3 NOH + process is more efficient than the Fenton process over an extended interval of C 0 (10-40 mM), as depicted in Fig.…”

Production of Reactive Oxygen Species by the Reaction of Periodate and Hydroxylamine for Rapid Removal of Organic Pollutants and Waterborne Bacteria

“…Since the degradation of 4-CP was virtually completely inhibited by • OH and 1 O 2 scavengers, we believe the production of • IO 3 should be limited in PI/HA, considering the prior reactivity of • IO 3 toward 4-CP in other IO 4 – /4-CP systems. , Accordingly, the subsequent generation of • IO 4 through reaction between • IO 3 and IO 4 – (eq ) should be insignificant as well. Although the reactivity of • IO 4 toward organic pollutants remains unknown, it seems to be low according to previous studies. ,, Thus, the contribution of • IO 4 to pollutant removal is supposed to be insignificant in the PI/HA system.…”

Atomically Dispersed Cobalt Sites on Graphene as Efficient Periodate Activators for Selective Organic Pollutant Degradation

“…With the ever-increasing severity of the ongoing water crisis due to the scarcity of viable, unpolluted water resources, the development of efficient, eco-friendly water treatment technology has become the crux of research efforts in this academic field. Over the past decades, researchers have developed periodate (IO 4 – )-based advanced oxidation processes (AOPs) capable of removing recalcitrant organic contaminants from aquatic environments via the in situ formation of powerful oxidizing species such as hydroxyl ( · OH) and iodyl (IO 3 · ) radicals. − Although IO 4 – is a strong oxidant (+1.60 V) thermodynamically, it suffers from poor kinetic properties during the oxidative decomposition of organic pollutants. , Thus, the core issue of this technology is the development of highly active, resource-efficient activators to promote the otherwise sluggish degradation reactions.…”