Heterogeneous activation of peroxymonocarbonate by chalcopyrite (CuFeS2) for efficient degradation of 2,4-dichlorophenol in simulated groundwater

Xu, Xiangjian; Tang, Daisheng; Jian-Hua, Cai; Xi, Beidou; Zhang, Yan; Pi, Li; Mao, Xuhui

doi:10.1016/j.apcatb.2019.03.080

Cited by 86 publications

(23 citation statements)

References 56 publications

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“…5c and 5d, respectively. In the absence of the cobalt species (only HCO3 − and H2O2), there was no degradation or the by-products observed in the first 20 min, which is in good agreement with other studies [3,37]. The commercial, pristine Co3O4 catalyst showed very slow AO7 degradation profile reaching to C/C0 = 0.76 after 20 min (Fig.…”

Section: J O U R N a L P R E -P R O O Fsupporting

confidence: 91%

“…Fenton-like catalysts show good organic pollutants degradation performance in aqueous solution and its activity can be significantly enhanced by the presence of cobalt ions [3,34] The APMC system has drawn significant attentions for the remediation of organic dye contamination from the textile industry due to its high oxidation efficiency under near-neutral or weakly alkaline conditions [35][36][37]. In this work, the APMC catalytic performance of both Co3O4-silica nanocomposites and the commercial Co3O4 particles for the degradation of AO7 was investigated and the UV-Vis spectra of AO7 solution as a function of time during the tests is shown in Fig.…”

Section: Fenton-like Catalytic Performancementioning

confidence: 99%

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Enhanced catalyst dispersion and structural control of Co3O4-silica nanocomposites by rapid thermal processing

Liu

Ding

Sarrigani

et al. 2020

Applied Catalysis B: Environmental

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Section: J O U R N a L P R E -P R O O Fsupporting

confidence: 91%

Section: Fenton-like Catalytic Performancementioning

confidence: 99%

Enhanced catalyst dispersion and structural control of Co3O4-silica nanocomposites by rapid thermal processing

Liu

Ding

Sarrigani

et al. 2020

Applied Catalysis B: Environmental

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“…The intermediate (brighter) layer 2 between the tribofilm and the deformed metallic region, contains a significant amount of sulfur, iron and zinc (Figure S7, Supporting Information) from ZnS and FeS, and similar observations have been made elsewhere . In addition, the high magnified STEM‐BF pictures in Figure S7 (Supporting Information) indicate the presence of crystalline structure from FeS 2 (211) ( d ‐spacing = 0.18 nm) and ZnS (220) ( d ‐spacing = 0.196 nm), which correspond to the regions with strong EDS mapping signal of zinc, iron and sulfur (Figure S7, Supporting Information).…”

Section: Resultssupporting

confidence: 71%

Unusual Competitive and Synergistic Effects of Graphite Nanoplates in Engine Oil on the Tribofilm Formation

Pham

Wan

Tieu

et al. 2019

Adv Materials Inter

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To exploit the improved efficiency from formulated oil modified with graphite nanoplates (GNP), it is important to understand how GNP behave alongside conventional additives such as zinc dialkyl dithiophosphates (ZDDP). The results in this work demonstrate unusual tribological responses of engine oil due to GNP additions, which cannot be explained by the traditionally low shearing mechanism between graphene layers in GNP. A competitive and synergistic effect of GNP on tribofilm formation is proposed for this unusual friction and wear behavior. The presence of GNP modifies the tribofilm formation and spontaneously creates alternate hard and soft regions from the microscopic view of the surface. At low concentrations (≤0.05 wt%), graphene is formed by shear‐assisted exfoliation of GNP and intermixed with intermediate oxide region. Due to its random orientation, graphene produces mechanical reinforcement of the tribofilm, but low shear yielding is not achieved. This gives rise to high friction but low wear conditions. At higher concentrations (>0.05 wt%), GNP align with their hexagonal sheets parallel to the surface to promote low‐shear sliding, but wear increases. This is due to GNP clumping together which makes them less effective at forming graphene and providing stable reinforcement of the tribofilm.

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“…Percarbonate has been detected during the production of alkali-metal peroxocarbonate salts , and in enzymatic reactions . It also has been evaluated as a potential oxidant for organic contaminants when contaminated groundwater from carbonate-rich formations undergoes pump-and-treat remediation. − However, its role in contaminant transformation during ISCO has not been considered previously. HCO 4 – is a selective electrophile that reacts with electron-rich compounds such as organosulfides, , amines, and alkenes .…”

Section: Introductionmentioning

confidence: 99%

Impact of Peroxymonocarbonate on the Transformation of Organic Contaminants during Hydrogen Peroxide in Situ Chemical Oxidation

Yang

Duan

Wang

et al. 2019

Environ. Sci. Technol. Lett.

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Under the conditions employed when in situ chemical oxidation is used for contaminant remediation, high concentrations of H2O2 (e.g., up to ∼10 M) are typically present. Using 13C NMR, we show that in carbonate-rich systems, these high concentrations of H2O2 result in a reaction with HCO3 – to produce peroxymonocarbonate (HCO4 –). After formation, HCO4 – reacts with phenol to produce di- and trihydroxyl phenols. HCO4 – reacts with substituted phenols in a manner consistent with its electrophilic character. Exchanging an electron-donating substituent in the para position of a phenolic compound with an electron-withdrawing group decreased the reaction rate. Results of this study indicate that HCO4 – is a potentially important but previously unrecognized oxidative species generated during H2O2 in situ chemical oxidation that selectively reacts with electron-rich organic compounds. Under conditions in which HO· formation is inefficient (e.g., relatively high concentration of HCO3 –, low total Fe and Mn concentrations), the fraction of the phenolic compounds that is transformed by HCO4 – could be similar to or greater than the fraction transformed by HO·. It may be possible to adjust treatment conditions to enhance the formation of HCO4 – as a means of accelerating rates of contaminant removal.

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Heterogeneous activation of peroxymonocarbonate by chalcopyrite (CuFeS2) for efficient degradation of 2,4-dichlorophenol in simulated groundwater

Cited by 86 publications

References 56 publications

Enhanced catalyst dispersion and structural control of Co3O4-silica nanocomposites by rapid thermal processing

Enhanced catalyst dispersion and structural control of Co3O4-silica nanocomposites by rapid thermal processing

Unusual Competitive and Synergistic Effects of Graphite Nanoplates in Engine Oil on the Tribofilm Formation

Impact of Peroxymonocarbonate on the Transformation of Organic Contaminants during Hydrogen Peroxide in Situ Chemical Oxidation

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