Optimization Modeling of nFe0/Cu-PRB Design for Cr(VI) Removal from Groundwater

Abstract

Hexavalent chromium is one of the highly toxic heavy metals which could lead to severe health issues when it is discharged into aquifers as industrial wastewater. In the current study nFe0/Cu was successfully employed in PRB technology for Cr(VI) removal from groundwater. Batch and column experiments confirmed the high reactive performance of nFe0/Cu towards Cr(VI) removal by around 85% removal efficiency. The main pathways for Cr-species removal by nFe0/Cu were determined as the reduction of Cr(VI) to Cr(III) by both nFe0 and Cu0 and the precipitation/co-precipitation of Cr(III) with the released iron oxides on the nFe0/Cu surface. The developed 3D-surface response optimization model confirmed the reciprocal relation between the residence time, barrier thickness and hydraulic conductivity. The interaction and sensitivity analysis between the model’s parameters were significantly crucial for defining the optimal design conditions of the nFe0/Cu-PRB. Generally, the current study could represent a great contribution in scaling-up the PRB technology towards the real field applications.

Reaction medium for permeable reactive barrier remediation of groundwater polluted by heavy metals

“…The ZVI surface is plated with another metal with high reduction potential (such as copper, platinum, and nickel) to form bimetallic material, which act as galvanic cells during the reaction to speed up the reaction rate. The bimetallic system composed of nZVI can reduce the agglomeration between nZVI and the activation energy during the reaction, thereby increasing the reduction rate (Maamoun et al, 2021). Shubair et al (2018) demonstrated that the removal mechanism of cesium by nZVI and nZVI/Cu is mainly chemical adsorption, with a removal rate of more than 99%.…”

“…Copper can promote the electron transfer of Fe 0 and the generation of Fe 2+ , thereby accelerating Cr(VI) removal. With the remove of Cr(VI) by the bimetallic system composed of nZVI/Cu as an example, the chemical reaction formula is as follows (Maamoun et al, 2021):…”

Radionuclides Removal from Aqueous Solutions: A Mini Review on Using Different Sorbents

“…Fe 0 is one of the most widely used reactive nanomaterials in water treatment applications within the last decade. The unique features of Fe 0 , represented in the nano size, high redox potential, coreshell structure, and high specific surface area, enables it to remove most of the soluble contaminants via several removal mechanisms (e.g., sorption, precipitation, coprecipitation, and reduction) [42][43][44][45][46]. As presented in Table 2, the use of iron-based sorbents in the removal of radionuclides from water has been intensively reported in the literature, owing to the great sorption abilities of such materials [47].…”

Chemical deposition of iron nanoparticles (Fe0) on titanium nanowires for efficient adsorption of ciprofloxacin from water

“…Despite the superb characteristics of Fe 0 nanoparticles, for instant, high reactivity, high surface area, and multiple elimination mechanisms, they still have several drawbacks which restrict their ability to remediate antibiotics from water (Falyouna et al 2019;Maamoun et al 2021a). Fast surface oxidation, agglomeration and insignificant oxidation capacity are the main weaknesses of Fe 0 nanoparticles and various approaches were embraced to tackle these limitations (Mokete et al 2020;Maamoun et al 2021b). The pervious researchers adopted numerous techniques to improve the performance of Fe 0 nanoparticles towards the elimination of CIP from water such as addition of Fenton reagent (i.e.…”