Green mechanochemical oxidative decomposition of powdery decabromodiphenyl ether with persulfate

Huang, Aizhen; Zhang, Zhimin; Wang, Nan; Zhu, Lihua; Zou, Jing

doi:10.1016/j.jhazmat.2015.09.072

Cited by 42 publications

(33 citation statements)

References 40 publications

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“…Researches showed that K 2 S 2 O 8 was transformed into sulfate under the activation of ball milling. The activation of persulfate supported an oxidation process (Huang et al, 2016;Liu et al, 2016). This suggests that K 2 S 2 O 8 played the role of oxidant during the ball milling process.…”

Section: Comparison Of Different Co-milling Reagentsmentioning

confidence: 75%

“…The recovery efficiency with NH 4 Cl was nearly 100% for Cu and 57.2% for Pd. In this case, K 2 S 2 O 8 , an oxidant often used in advanced oxidation technologies(Huang et al, 2016), was added to the ball milling to further increase metal recovery efficiency. By comparing Fig.2a with b, it can be seen that recovery efficiency of Pd was significantly enhanced for NaCl and NH 4 Cl after the addition of K 2 S 2 O 8 , especially NaCl.…”

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confidence: 99%

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An environmentally friendly ball milling process for recovery of valuable metals from e-waste scraps

Zhang

Yao

2017

Waste Management

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The present study reports a mechanochemical (MC) process for effective recovery of copper (Cu) and precious metals (i.e. Pd and Ag) from e-waste scraps. Results indicated that the mixture of KSO and NaCl (abbreviated as KSO/NaCl hereafter) was the most effective co-milling reagents in terms of high recovery rate. After co-milling with KSO/NaCl, soluble metallic compounds were produced and consequently benefit the subsequent leaching process. 99.9% of Cu and 95.5% of Pd in the e-waste particles could be recovered in 0.5mol/L diluted HCl in 15min. Ag was concentrated in the leaching residue as AgCl and then recovered in 1mol/L NH solution. XRD and XPS analysis indicated that elemental metals in the raw materials were transformed into their corresponding oxidation state during ball milling process at low temperature, implying that solid-solid phase reactions is the reaction mechanism. Based on the results and thermodynamic parameters of the probable reactions, possible reaction pathways during ball milling were proposed. Suggestion on category of e-waste for ball milling process was put forward according to the experiment results. The designed metal recovery process of this study has the advantages of highly recovery rate and quick leaching speed. Thus, this study offers a promising and environmentally friendly method for recovering valuable metals from e-waste.

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Section: Comparison Of Different Co-milling Reagentsmentioning

confidence: 75%

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confidence: 99%

An environmentally friendly ball milling process for recovery of valuable metals from e-waste scraps

Zhang

Yao

2017

Waste Management

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“…Both experimental and theoretical data confirmed the promotional effect of short‐chain saturated alcohols on the decomposition of H 2 O 2 over Fe 3 O 4 microspheres. This finding may have wide applications because the oxidation process has been involved in many technologies . In the present work, this process was exploited to improve the selective oxidation of PhCH 2 OH to PhCHO with H 2 O 2 in water over Fe 3 O 4 microspheres.…”

Section: Resultsmentioning

confidence: 98%

Promotional effect of short‐chain saturated alcohols on Fe₃O₄‐catalyzed decomposition of H₂O₂ and its application in selective oxidation of benzyl alcohol

Zhang

Xiao

Chen

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Hydrogen peroxide (H2O2) has been used widely in diverse areas of biotechnology, environmental remediation and organic synthesis wherein its catalytic activation to generate reactive oxygen species (e.g. hydroxyl radicals) is of vital importance. Magnetite (Fe3O4) microspheres are attractive heterogeneous peroxidase‐like catalysts due to many technological advantages (e.g. biocompatible, stable and magnetically recoverable). However, its peroxidase‐like activity has to be improved for practical applications. RESULTS Small amounts of short‐chain saturated alcohols (e.g. methanol, ethanol, iso‐propanol, tert‐butanol, mono‐ethylene glycol and glycerol) increased collision frequency between H2O2 and Fe3O4 (e.g. by about two orders of magnitude with the addition of 1 mol% glycerol) via facilitating the nucleophilic addition of H2O2 to surface Fe sites and promoted Fe3O4‐catalyzed decomposition of H2O2 and selective oxidation of benzyl alcohol with H2O2 in water. In addition, Fe3O4 microspheres were magnetically recoverable and reusable for at least five times without loss of catalytic activity and selectivity. CONCLUSIONS The Fe3O4/trace alcohol catalytic system decomposed H2O2 effectively. Its potential application was demonstrated by selective oxidation of benzyl alcohol with H2O2 in water in this work. This simple and efficient catalytic system may be applied also to other oxidative transformations in organic syntheses, or to oxidative degradation of organic pollutants in environmental remediation. © 2019 Society of Chemical Industry

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“…The efficiency of the MC degradation of organic pollutants is improved by using appropriate additives. For example, CaO, 14 CaO-SiO 2 , 15 Fe, 16 zerovalent metal (e.g., Fe, Al)-SiO 2 , 17 persulfate (PS), 18 and PS−CaO 19 have been used as efficient additives in MC degradation of chlorinated and brominated organic pollutants, although these additives are not efficient enough individually for the MC degradation of PFOA (SI Table S1). Yan et al investigated the MC degradation of a chlorinated polyfluorinated ether sulfonate (F-53B, a PFOS alternative) by using sodium persulfate and NaOH as comilling agents, and found that the defluorination efficiency of F53−B was 54% after ball milling for 8 h. 20 Zhang et al reported that ball milling for 8 h produced defluorination efficiency of PFOA and F-53B greater than 80% by adding KOH as a milling agent with a KOH/ PFOA molar ratio of 170:1, but less than 20% by adding NaOH.…”

Section: ■ Introductionmentioning

confidence: 99%

Complete Defluorination and Mineralization of Perfluorooctanoic Acid by a Mechanochemical Method Using Alumina and Persulfate

Wang

Zhou

et al. 2019

Environ. Sci. Technol.

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Perfluorooctanoic acid (PFOA) is a persistent organic pollutant that has received concerns worldwide due to its extreme resistance to conventional degradation. A mechanochemical (MC) method was developed for complete degradation of PFOA by using alumina (Al2O3) and potassium persulfate (PS) as comilling agents. After ball milling for 2 h, the MC treatment using Al2O3 or PS caused conversion of PFOA to either 1-H-1-perfluoroheptene or dimers with a defluorination efficiency lower than 20%, but that using both Al2O3 and PS caused degradation of PFOA with a defluorination of 100% and a mineralization of 98%. This method also caused complete defluorination of other C3∼C6 homologues of PFOA. The complete defluorination of PFOA attributes to Al2O3 and PS led to the weakening of the C–F bond in PFOA and the generation of hydroxyl radical (•OH), respectively. During the MC degradation, Al2O3 strongly anchors PFOA through COO––Al coordination and in situ formed from Lewis-base interaction and PS through hydrogen bond. Meanwhile, mechanical effects induce the homolytic cleavage of PS to produce SO4 •–, which reacts with OH group of Al2O3 to generate •OH. The degradation of PFOA is initiated by decarboxylation as a result of weakened C–COO– due to Al3+ coordination. The subsequent addition of •OH, elimination of HF, and reaction with water induce the stepwise removal of all carboxyl groups and F atoms as CO2 and F– , respectively. Thus, complete defluorination and mineralization are achieved.

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Green mechanochemical oxidative decomposition of powdery decabromodiphenyl ether with persulfate

Cited by 42 publications

References 40 publications

An environmentally friendly ball milling process for recovery of valuable metals from e-waste scraps

An environmentally friendly ball milling process for recovery of valuable metals from e-waste scraps

Promotional effect of short‐chain saturated alcohols on Fe₃O₄‐catalyzed decomposition of H₂O₂ and its application in selective oxidation of benzyl alcohol

Complete Defluorination and Mineralization of Perfluorooctanoic Acid by a Mechanochemical Method Using Alumina and Persulfate

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Green mechanochemical oxidative decomposition of powdery decabromodiphenyl ether with persulfate

Cited by 42 publications

References 40 publications

An environmentally friendly ball milling process for recovery of valuable metals from e-waste scraps

An environmentally friendly ball milling process for recovery of valuable metals from e-waste scraps

Promotional effect of short‐chain saturated alcohols on Fe3O4‐catalyzed decomposition of H2O2 and its application in selective oxidation of benzyl alcohol

Complete Defluorination and Mineralization of Perfluorooctanoic Acid by a Mechanochemical Method Using Alumina and Persulfate

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Promotional effect of short‐chain saturated alcohols on Fe₃O₄‐catalyzed decomposition of H₂O₂ and its application in selective oxidation of benzyl alcohol