The Synergetic Effects in a Fenton-like System Catalyzed by Nano Zero-valent Iron (nZVI)

Insights into the role of nanoscale zero‐valent iron in Fenton oxidation and its application in naphthalene degradation from water and slurry systems

“…Besides more H 2 O 2 consumption, nZVI addition would create a synergistic environment, including Fe (II) liberation and reducing Fe (III) to Fe (II) (Wu et al, 2019; Yao et al, 2019). To examine the synergistic effect, the behavior of Fe (II) in NAP‐free solution was determined and the result was presented in Figure 4.…”

“…In contrast, nZVI addition could play a positive role in Fenton‐like process. Yao et al (2019) reported that H 2 O 2 utilization could be enhanced from 46.4% to 73.4% when nZVI was involved into the Fenton process (Yao et al, 2019). Nevertheless, fewer insights into the role of nZVI in Fenton‐like oxidation systems have been provided, especially the impact of nZVI on the H 2 O 2 utilization, Fe (II) concentration in solution and HO• yield. $$$$ \mathrm{Fe}(0)+2\mathrm{Fe}\left(\mathrm{II}\mathrm{I}\right)\to 3\mathrm{Fe}\left(\mathrm{II}\right) $$$$ $$$$ {\mathrm{e}}^{-}+\mathrm{Fe}\ {\left(\mathrm{II}\right)}_{\mathrm{absorbed}}+\mathrm{Fe}\ {\left(\mathrm{II}\mathrm{I}\right)}_{\mathrm{dissolved}}\to \mathrm{Fe}\ {\left(\mathrm{II}\right)}_{\mathrm{absorbed}}+\mathrm{Fe}\ {\left(\mathrm{II}\right)}_{\mathrm{dissolved}} $$$$ To fulfill this gap, this study selected naphthalene (NAP) as the target contaminant to investigate the mechanisms of nZVI in Fenton‐like processes and its potential application due to the following reasons.…”

“…Some influencing factors should be taken into consideration for pollutants removal in Fenton-like process coupled with nZVI, including H 2 O 2 consumption, HO• yield, and Fe (II) concentration. Considerable studies have been conducted to investigate the synergetic effect of nZVI (Wu et al, 2019;Yao et al, 2019). nZVI presence can promote the Fe (II)/Fe (III) redox cycle, at the meantime, the dissolved iron ions will be adsorbed on the nZVI surface and accelerate the electrons transmission from nZVI core to shell, as shown in Equations 4 and 5.…”

Zero-Valent Iron Nanoparticles and Its Combined Process for Diclofenac Degradation under Various Experimental Conditions

“…Due to the addition of H 2 O 2 , a lot of hydroxyl radicals were generated. The standard redox potential 2.8 V of hydroxyl radical is undifferentiated oxidation to any organic substance [27,28]. The high removal rate of TOC was also showed the DCF mineralization by the Fenton-like oxidation.…”

“…It was found that this combined process of nZVI and H 2 O 2 could degrade carbamazepine rapidly and was well suited for groundwater, with a removal rate of more than 98%. Yao et al [28] used a nZVI Fenton-like system formed by nZVI and H 2 O 2 for nitrobenzene treatment. The removal rate of 91.9% was obtained in 240 min reaction.…”