Combined Electrosorption and Chemisorption of As(V) in Water by Using Fe-rGO@AC Electrode

Abstract

A novel method of arsenic removal from water, combined electrosorption and chemisorption (CEC), has been presented in this work in order to deeply eliminate arsenic in water. This method was proposed using a mixture of activated carbon (AC) and reduced graphene−iron composite (Fe-rGO) as the electrode (Fe-rGO@AC). The results showed that the AC had a better electrosorption performance, while Fe-rGO was more suitable for chemisorption of As(V). The Fe-rGO@AC electrode combined the electrosorption with chemisorption. It was confirmed that the combination accelerated the adsorption rate of Fe-rGO. The AC on the electrode accelerated the mobility of arsenic ions and concentrated them in the electrical double layer (EDL) by means of electrostatic force underpotential. Meanwhlie, the concentrated As(V) ions reacted with Fe-rGO, contributing to a higher arsenic chemisorption on Fe-rGO. Therefore, the combination of electrosorption with chemisorption was an effective process for arsenic removal.

Design, synthesis, and performance of adsorbents for heavy metal removal from wastewater: a review

“…For example, an Fe-rGO/AC composite was employed for capacitive detoxification of carcinogenic As( v ). 86 The composite exhibited an improved adsorption capacity and accelerated adsorption rate, since Fe-rGO allowed effective chemisorption while AC contributed to a mesoporous structure for boosting ion transfer and uniform dispersion of Fe-rGO. Fe 3 O 4 nanoparticles were also distributed on porous graphene to form a magnetic nanocomposite, achieving large electrosorption capacities of 40.0–49.0 mg g −1 for Pb( ii ), Cu( ii ), and Cd( ii ).…”

Aero-Gel Based Cerium Doped Iron Oxide Solid Solution for Ultrafast Removal of Arsenic

“…32,33 After doping of iron, a new peak in the range of 500 to 600 nm wavelength was also observed which is consistent from previous studies and accredited to the presence of Fe 2+ and Fe 3+ ions. From the Tauc plots of these samples ((ahn) 2 (eV/cm) 2 Vs hv (eV)), the band gaps were calculated and found to be decreased after doping of iron from 3.001 to 2.457 eV (Figure S3a,b,c) and Table 3.…”

“…Arsenic is a metalloid element and naturally present in earth crust, widely distributed throughout the environment and extremely toxic in its inorganic form . The long-term consumption of arsenic through drinking water and food can cause several chronic diseases including cardiovascular, neurotoxicity and diabetes . According to WHO, Bangladesh and India are some of the most affected countries dealing with arsenic exposure: approximately 45 million people in Bangladesh are at risk of being exposed to arsenic. , Results from mass health study revealed that more than 400 people in Bangladesh have lost their life due to arsenic poisoning from 2000 to 2009 and many are still suffering from skin lesions and cancer .…”

Electroanalysis with a single microbead of phosphate binding resin (FerrIX™) mounted in epoxy film

“…In contrast to these electrically conducting high surface area materials, traditional ion exchanger materials with high surface area and ion binding capacity have been developed based on polymer or polymer-inorganic hybrids [6]. The use of hydrous iron oxide as electrosorption material (particularly for arsenate and phosphate) in conjunction with high surface area carbons [7] and with ion exchanger membranes [8] has been explored.…”