Heterogeneous Electro-Fenton-like Designs for the Disposal of 2-Phenylphenol from Water

Abstract

The hunt for efficient and environmentally friendly degradation processes has positioned the heterogeneous advanced oxidation processes as an alternative more interesting and economical rather than homogenous processes. Hence, the current study lies in investigating the efficiency of different heterogeneous catalysts using transition metals in order to prevent the generation of iron sludge and to extend the catalogue of possible catalysts to be used in advanced oxidation processes. In this study, nickel and zinc were tested and the ability for radical-generation degradation capacity of both ions as homogeneous was evaluated in the electro-Fenton-like degradation of 2-phenylphenol. In both cases, the degradation profiles followed a first-order kinetic model with the highest degradation rate for nickel (1 mM) with 2-phenylphenol removal level of 90.12% and a total organic reduction near 70% in 2 h. To synthesise the heterogeneous nickel catalyst, this transition metal was fixed on perlite by hydrothermal treatment and in a biochar or carbon nanofibers by adsorption. From the removal results using the three synthesized catalysts, it is concluded that the best catalysts were obtained by inclusion of nickel on biochar or nanofibers achieving in both with removal around 80% before 1 h. Thus, to synthetize a nickel electrocatalyst, nickel doped nanofibers were included on carbon felt. To do this, the amount of carbon black, nickel nanofibers and polytetrafluoroethylene to add on the carbon felt was optimized by Taguchi design. The obtained results revealed that under the optimised conditions, a near-complete removal was achieved after 2 h with high stability of the nickel electrocatalyst that open the applicability of this heterogeneous system to operate in flow systems.

Activity and Stability of Bifunctional Perovskite/Carbon-Based Electrodes for the Removal of Antipyrine by Electro-Fenton Process

“…These results revealed a certain contribution of the anodic oxidation and radical oxygen species from sulfate anions (electrolyte) or CB/PTFE_20_W electrode through potential EF reactions. Interestingly, it was also noteworthy a higher activity of the CB/ PTFE_20_W than the other carbon electrodes employed in literature (graphite laminate and carbon felt) (Poza-Nogueiras et al, 2021;Fdez-Sanromán et al, 2021;Puga et al, 2021;Meijide et al, 2021).…”

“…S7b) also exceedingly rose with the increment of current density, being necessary 240 min to accomplish almost complete mineralisation of ANT (92%). Additional control experiments were performed at the same current intensity (120 mA/cm 2 ) with the CB/PTFE_20_W, and other commercial carbon electrodes commonly used in literature, such as graphite laminate and carbon felt (Poza-Nogueiras et al, 2021;Fdez-Sanromán et al, 2021;Puga et al, 2021;Meijide et al, 2021). Negligible elimination rates of ANT and TOC mineralisation were observed for graphite laminate and carbon felt cathodes.…”

All-in-One Continuous Electrochemical Monitoring of 2-Phenylphenol Removal from Water by Electro-Fenton Treatment

“…Despite the plethora of studies based on electro-Fenton (EF) process for the degradation of pollutants, scarce literature is found on its application for the degradation of 2PP. Currently, only Sanromán and collaborators reported an EF-like process in which they employed a transition metal as catalyst (Ni and Zn), showing a removal percentage of 80% before 1 h with optimal experimental conditions [38].…”

A Review on Carbon Quantum Dots Modified g-C3N4-Based Photocatalysts and Potential Application in Wastewater Treatment

“…Predominantly, wastewater is the key source of water pollution, occurring particularly from chemical industrialization, which is carcinogenic and enormously poisonous in nature due to the presence of extensive large organic complexes [3]. The conventionally utilized environmental remediation processes, such as chemical oxidation, adsorption, incineration, and biological oxidation, have been employed in the mitigation of all types of toxic and organic water contaminants [4][5][6][7]. However, the performance of these techniques is not effective, owing to an incomplete degradation of the persistent organic pollutants and noxious sludge formation [7][8][9].…”