Toward a better understanding of peroxymonosulfate and peroxydisulfate activation using a nano zero-valent iron catalyst supported on graphitized carbon: Mechanisms and application to the degradation of estrogenic compounds in different water matrix

Cai, Minjuan; Cheng, Peng; Li, Jinjun; Wu, Feng; Sarakha, Mohamed; Mailhot, Gilles; Brigante, Marcello

doi:10.1016/j.jclepro.2023.137702

Cited by 12 publications

(3 citation statements)

References 52 publications

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“…Notably, these research studies revealed that nZVI materials can be conveniently recovered by a magnet and reused 3-5 times in AOPs (Figure 5), which reinforces their potential recyclable application in practice [58,69,71,72,77,87]. After storage for 6 months, nZVI/CF still had a favorable levofloxacin degradation efficiency, which confirms that nZVI materials can possess excellent long-term stability (Figure 5B) [69], while some recycling experiments in the reported research suffered an obvious decrease in degradation efficiency [60,79,88], for example, the degradation rate of atrazine was only 40.1% in the seconds run, which is a significant reduction of 53.7% below the initial rate [70].…”

Section: Applicationssupporting

confidence: 63%

“…Furthermore, supposing that the persulfate is PMS, the formation pathway of •OH has a slight difference; that is, Fe 2+ catalyzes HSO 5 − to produce •OH or •SO 4 − , as shown in Equations ( 13) and ( 14) [40,69,83,88]. PMS can also directly react with Fe 0 via electron transfer to generate •SO 4 − (Equation ( 15)), similarly to the activation mechanism of PDS [84].…”

Section: Mechanismsmentioning

confidence: 99%

“…This may be attributed to the hydrolysis of SO 4 − (Equations ( 6) and ( 7)) during the reaction, which can be promoted by the modification of nZVI, and thus generate more •OH and incidentally cause the system to be acidic [57,63]. Additionally, most of the research stated that •SO 4 − plays a more dominant role in the reaction compared to •OH [40,59,66,68,69,80,83,84,88]. Investigations suggested that an acidic environment is favorable for the generation of •SO 4 − , while neutral and alkaline conditions were more conducive to the formation of •OH (Figure 6A); hence, this could have affected the domination of •OH and •SO 4 − in the degradation process [60,76].…”

Section: Mechanismsmentioning

confidence: 99%

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Recent Advances in Nanoscale Zero-Valent Iron (nZVI)-Based Advanced Oxidation Processes (AOPs): Applications, Mechanisms, and Future Prospects

Liu,

Ye,

et al. 2023

Nanomaterials

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The fast rise of organic pollution has posed severe health risks to human beings and toxic issues to ecosystems. Proper disposal toward these organic contaminants is significant to maintain a green and sustainable development. Among various techniques for environmental remediation, advanced oxidation processes (AOPs) can non-selectively oxidize and mineralize organic contaminants into CO2, H2O, and inorganic salts using free radicals that are generated from the activation of oxidants, such as persulfate, H2O2, O2, peracetic acid, periodate, percarbonate, etc., while the activation of oxidants using catalysts via Fenton-type reactions is crucial for the production of reactive oxygen species (ROS), i.e., •OH, •SO4−, •O2−, •O3CCH3, •O2CCH3, •IO3, •CO3−, and 1O2. Nanoscale zero-valent iron (nZVI), with a core of Fe0 that performs a sustained activation effect in AOPs by gradually releasing ferrous ions, has been demonstrated as a cost-effective, high reactivity, easy recovery, easy recycling, and environmentally friendly heterogeneous catalyst of AOPs. The combination of nZVI and AOPs, providing an appropriate way for the complete degradation of organic pollutants via indiscriminate oxidation of ROS, is emerging as an important technique for environmental remediation and has received considerable attention in the last decade. The following review comprises a short survey of the most recent reports in the applications of nZVI participating AOPs, their mechanisms, and future prospects. It contains six sections, an introduction into the theme, applications of persulfate, hydrogen peroxide, oxygen, and other oxidants-based AOPs catalyzed with nZVI, and conclusions about the reported research with perspectives for future developments. Elucidation of the applications and mechanisms of nZVI-based AOPs with various oxidants may not only pave the way to more affordable AOP protocols, but may also promote exploration and fabrication of more effective and sustainable nZVI materials applicable in practical applications.

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