Boosting Heterogeneous Fenton Reactions for Degrading Organic Dyes via Photothermal Effect under Neutral Conditions

Although heterogeneous Fenton reaction has demonstrated great promise in the remediation of refractory organic pollutants, its widespread application is still limited by the insufficient degradation performance under neutral conditions. Here,...

CATALYTIC PROPERTIES IN THE HETEROGENEOUS FENTON REACTION OF THE SURFACE OF NANOPOROUS IRON OBTAINED BY ELECTROCHEMICAL DEALOIYNG IN MELTED CHLORIDE MIXTURES

Исследованы образцы частично окисленного микро- и нанопористого железа, полученного методом высокотемпературного деаллоинга железо-марганцевого сплава в солевом расплаве. При помощи электронной микроскопии получены данные о морфологии образцов и составе их поверхности, установлено, что уже после отмывки при комнатной температуре на воздухе образовались оксидные фазы железа в виде вискеров толщиной порядка 10 нм. В ходе получения образцов достигалось количественное удаление марганца из исходного сплава. Оценена каталитическая активность полученных образцов в гетерогенной реакции Фентона по окислению красителя метилового оранжевого пероксидом водорода. На первом этапе протекания реакции, описываемой уравнением реакции первого порядка, ее скорость определялась наиболее активной расходуемой частью образцов, далее реакция переходила в стационарный режим. Более высокой каталитической активностью обладали нанопористые образцы. The samples of partially oxidized micro- and nanoporous iron obtained by high-temperature dealloing of an iron-manganese alloy in a molten salt were investigated. The data concerning the structure of the samples and the composition of their surface were obtained by electron microscopy; it was found that after washing at room temperature in air the oxide phases of iron were formed as whiskers with a thickness of about 10 nm. During the preparation of the samples a quantitative removal of manganese from the initial alloy was achieved. The catalytic activity of the obtained samples in the heterogeneous Fenton reaction was estimated by oxidation of methyl orange by hydrogen peroxide. The rate of the first stage of the reaction, which was described by the first-order equation, was determined by the most active spent part of the samples, and then the reaction passed into the stationary mode. The nanoporous samples possessed a higher catalytic activity.

Review: Effects of soil organic matters on Fenton reaction

Heterogeneous Fenton reaction has been widely known to destruct organic contaminants, in its basic application definition, by applying one or more Fe2+ or Fe3+-containing source(s) with hydrogen peroxide for producing the strong hydroxyl radicals. Comprehensive experiments in the Fenton reaction area have been done for over 100 years, and considerable progress has been achieved. Achieved removal efficiency by Fenton reaction is usually studied by evaluating the effects of parameters such as initial reagents concentrations, pH, and soil organic matter (SOM). Among them, the results related to the effect of SOM sometimes seem conflicting, as its effects are reported either promoting or inhibiting and sometimes both. Reaction parameters such as initial reagents and pH are the most studied and effective ones in evaluating the effects of SOM on Fenton reaction for organic pollutants. This review intends to give a comprehensive survey of the impact of SOM on the Fenton reaction, with the focus on the heterogeneous Fenton reaction in the soil and solid. For this purpose, the general effects of pH and initial reagents on the Fenton reaction are reviewed in the beginning

Review: Effects of soil organic matters on Fenton reaction

Heterogeneous Fenton reaction has been widely known to destruct organic contaminants, in its basic application definition, by applying one or more Fe2+ or Fe3+-containing source(s) with hydrogen peroxide for producing the strong hydroxyl radicals. Comprehensive experiments in the Fenton reaction area have been done for over 100 years, and considerable progress has been achieved. Achieved removal efficiency by Fenton reaction is usually studied by evaluating the effects of parameters such as initial reagents concentrations, pH, and soil organic matter (SOM). Among them, the results related to the effect of SOM sometimes seem conflicting, as its effects are reported either promoting or inhibiting and sometimes both. Reaction parameters such as initial reagents and pH are the most studied and effective ones in evaluating the effects of SOM on Fenton reaction for organic pollutants. This review intends to give a comprehensive survey of the impact of SOM on the Fenton reaction, with the focus on the heterogeneous Fenton reaction in the soil and solid. For this purpose, the general effects of pH and initial reagents on the Fenton reaction are reviewed in the beginning. Keywords: Fenton reaction, Hydrogen peroxide, pH, Soil organic matter (SOM), The removal efficiency