Treatment of Arsenite‐Contaminated Water by Electrochemical Advanced Oxidation Processes

Abstract

Arsenite removal from aqueous medium is quite challenging as most of the conventional methods fail to exhibit arsenite removal completely. The present article examines the possibility of electrochemical advanced oxidation processes to remove arsenite from water medium. Anodic oxidation and electro‐Fenton processes failed to remove generated arsenate in the system but found effective to oxidize arsenite completely from its initial concentrations of 1 mg/L and 10 mg/L. Arsenite oxidation is mainly due to in‐situ generated hydrogen peroxide and hydroxyl radicals for anodic oxidation and electro‐Fenton processes. However, peroxicoagulation process was found effective for the oxidation of arsenite as well as removal of arsenic in water. Complete removal of arsenic was observed within 30 min of electrolysis time for pH range in between 3 to 11. Overall, peroxicoagulation is an effective way to remove arsenic from aqueous solution.

Oxygen Reduction Reaction in the Field of Water Environment for Application of Nanomaterials

“…Furthermore, electrocatalytic degradation can handle heavy metals. Nidheesh et al [21] conducted an anode direct oxidation experiment on anode oxidizing arsenic in two different electrode systems (Pt/Ti-graphite and Pt/Ti-graphite felt). Under the same current conditions, electrolysis was 60 min.…”

“…It is a type of composition or crystal of atoms, molecules, and macro systems. If one direction is at the nanometer level, it is called a two-dimensional nanomaterial, such as nanosheets [ 15 ] and nanomembranes [ 16 ]; if two directions reach the nanometer level, it is called nanomaterials, such as nanofiber [ 17 , 18 , 19 ], nanotube [ 20 ], and nanorod [ 21 ]; and if the three directions reach the nanometer level at the same time, it is called zero-dimensional nanomaterials, such as nanoparticles [ 22 ], quantum dots, etc. Three different geometrical structures of GR are shown in Figure 2 .…”

“… The flow of nanomaterials into the environment may have a profound impact on living things. Nanomaterials will inevitably flow into the environment during production, use, and disposal [ 20 , 21 ]. The activated or generated active oxygen clusters, such as the hydroxyl groups often mentioned above, will cause significant oxidative damage to biological cells.…”

Removal of Arsenate From Groundwater by Cathode of Bioelectrochemical System Through Microbial Electrosorption, Reduction, and Sulfuration

“…Generally, As(III) is easily oxidized to As(V) (Zhou et al, 2013). Thus, the oxidization of As(III) to As(V) as a pretreatment has been regarded as an efficient approach to remove As(III) (Nidheesh et al, 2020;Wang et al, 2020). However, treatments for As decontamination of shallow groundwater are focused on As(V) removal (Chen et al, 2018) given that As(V) dominates As species in shallow ground water.…”

Electrocatalytic Degradation of Tetracycline by Cu‐PANI‐SBA‐15 on Nickel Foam via Peroxymonosulfate‐Based Advanced Oxidation Process

“…Recently, electrochemical AOPs (or EAOPs), where radicals such as . OH or SO 4 .− are produced in situ using electricity, have received considerable attention [17,21] . One of the significant advantages of EAOPs is the complete removal of total organic carbon (TOC), which may include harmful byproducts formed during degradation [17,22] .…”