Electro-Fenton oxidation of imidacloprid by Fe alginate gel beads

Hydrothermal electrocatalytic oxidation for the treatment of herbicides wastewater

“…By adding the homogeneous and heterogeneous catalysts, it can be performed in a milder condition with higher efficiency compared to those in the traditional hydrothermal oxidation processes. However, there are challenges in subsequent dealing and recycling utilization of the added catalysts (Iglesias et al 2014). Here, we attempted to combine HTCO with EO.…”

“…Except that, H 2 O 2 was also added in this system since it is one of the important assisted oxidants in most of the advanced oxidation processes (AOPs). For example, the active hydroxyl radicals (·OHs) can be generated from H 2 O 2 by the direct UV photolysis in a photocatalytic reaction system (Gong et al 2015;Brillas et al 2003) or from the reaction with Fe 2+ in a Fenton or electro-Fenton system (Iglesias et al 2014;Zazo et al 2011). In an electrochemical system, both ·OH and hydroperoxy radicals (HO 2 ·) can be produced from H 2 O 2 through the cathode reduction or anode oxidation reactions (Morais et al 2012;Brillas et al 2000), which can effectively increase the amount of active radicals.…”

“…Moreover, pollutants and their intermediates can also be adsorbed on the surface of the electrode, resulting in the passivation of the electrode, which will decrease the decomposition rate greatly, especially at a high pollution concentration (Brillas et al 2004). To obtain a fast degradation of pollutions, even at the high concentration, many other techniques combined with EO were developed, such as microwave, ultrasound, Fenton oxidation, and photoelectric-synergistic catalytic oxidation Souza et al 2015;Iglesias et al 2014;Solano et al 2015). In these reaction systems, the problems induced by mass transfer or electrode passivation can be well dissolved; thus, enhanced degradation efficiency can be achieved.…”

Neutral solar photo-Fenton degradation of 4-nitrophenol on iron-enriched hybrid montmorillonite-alginate beads (Fe-MABs)

“…This material is biocompatible, inexpensive, and is easily assembled into spherules or beads [22]. However, the replacement of calcium cations in the alginate matrix with the catalytic iron species would significantly decrease the bead stability [23,24]. Recently, mesoporous inorganic materials, such as alumina silicates clays (montmorillonite, halloysite), have been used to obtain hybrid gel beads with improved stability [18,25,26].…”

Removal of Imidacloprid Pesticide by Electrocoagulation Process using Iron and aluminum Electrodes

“…The dermal LD50 in rats was estimated at greater than 5000 mg/kg [6]. There are several methods to remove the imidacloprid from water, such as treatment by photolysis [7], photo-Fenton [8], ozonation [9], electrocatalytic oxidation [10] and electrofenton oxidation [11]. Most practical methods are the application of electrocoagulation (EC) which is an electrochemical wastewater treatment technology.…”