Preforming abundant surface cobalt hydroxyl groups on low crystalline flowerlike Co3(Si2O5)2(OH)2 for enhancing catalytic degradation performances with a critical nonradical reaction

Zhu, Zhong-Shuai; Yu, Xiaojie; Qu, Jin; Jing, Ya-Qiong; Abdelkrim, Yasmine; Yu, Zhong‐Zhen

doi:10.1016/j.apcatb.2019.118238

Cited by 103 publications

(40 citation statements)

References 101 publications

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“…Surface hydroxyl group is documented in many recent publication and is believed to play important role in the catalytic activity of catalysts. [46][47][48][49] Therefore, we expected that the changes in the surface hydroxyl groups after the incorporation of MgO might be important to change the PMS complexation from inner sphere to outer sphere.…”

Section: Changes In the Redox Properties Of Copper After The Incorpormentioning

confidence: 99%

Tuning of Persulfate Activation from a Free Radical to a Nonradical Pathway through the Incorporation of Non-Redox Magnesium Oxide

Ali

Zhan

Wang

et al. 2020

Environ. Sci. Technol.

460

124

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Nonradical-based advanced oxidation processes for pollutant removal have attracted much attention due to their inherent advantages. Herein we report that magnesium oxides (MgO) in CuOMgO/Fe3O4 not only enhanced the catalytic properties but also switched the free radical peroxymonosulfate (PMS)-activated process into the 1O2 based nonradical process. CuOMgO/Fe3O4 catalyst exhibited consistent performance in a wide pH range from 5.0 to 10.0, and the degradation kinetics were not inhibited by the common free radical scavengers, anions, or natural organic matter. Quantitative structure–activity relationships (QSARs) revealed the relationship between the degradation rate constant of 14 substituted phenols and their conventional descriptor variables (i.e., Hammett constants σ, σ–, σ+), half-wave oxidation potential (E 1/2), and pK a values. QSARs together with the kinetic isotopic effect (KIE) recognized the electron transfer as the dominant oxidation process. Characterizations and DFT calculation indicated that the incorporated MgO alters the copper sites to highly oxidized metal centers, offering a more suitable platform for PMS to generate metastable copper intermediates. These highly oxidized metals centers of copper played the key role in producing O2 •– after accepting an electron from another PMS molecule, and finally 1O2 as sole reactive species was generated from the direct oxidation of O2 •– through thermodynamically feasible reactions.

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Section: Changes In the Redox Properties Of Copper After The Incorpormentioning

confidence: 99%

Tuning of Persulfate Activation from a Free Radical to a Nonradical Pathway through the Incorporation of Non-Redox Magnesium Oxide

Ali

Zhan

Wang

et al. 2020

Environ. Sci. Technol.

460

124

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“…Photocatalysis of azo dyes like MB and MO by Bi‐ and Ce‐PMOS containing heterojunction active sites required energy for the transition of electrons from the valence band (VB) to the conduction band (CB) (Mudassir et al, 2018). Photons of visible light can provide energy for the electronic transition toward CB, in which dissolved oxygen molecules are reduced into .O 2 − radicals that were largely responsible for MO degradation (Dong et al, 2019; Jia et al, 2020; Zhu et al, 2020). After that, .O 2 − radicals were changed into highly reactive .O 2 H which instantly changed into H 2 O 2 and lastly produces free hydroxyl radicals .OH.…”

Section: Resultsmentioning

confidence: 99%

“…After that, .O 2 − radicals were changed into highly reactive .O 2 H which instantly changed into H 2 O 2 and lastly produces free hydroxyl radicals .OH. A large number of VB‐holes in Bi‐ and Ce‐PMOS have sufficient energy to oxidize MB (Huang et al, 2018; Jia et al, 2020) and can react with H 2 O/OH − and change into .OH which predominantly degrade the cationic MB (Daoud et al, 2005; Seven et al, 2004; Zhu et al, 2020). All the reaction intermediates were short‐lived due to unpaired electron; however, heterojunction materials can increase the recombination lifetime of photo‐generated electron–hole pairs by following the Z‐scheme mechanism under visible light (Hong et al, 2018), which increased the degradation of MB and MO molecules as expected in Figure 7.…”

Section: Resultsmentioning

confidence: 99%

Energizing periodic mesoporous organosilica (PMOS) with bismuth and cerium for photo‐degrading methylene blue and methyl orange in water

Shahzad

Khan

Elboughdiri

et al. 2021

Water Environment Research

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This work reported an efficient catalyst to reduce the organic pollutants by using an energetic periodic mesoporous organosilica (PMOS) supported with bismuth (Bi-PMOS) and cerium (Ce-PMOS). PMOS support was designed through cocondensation of sodium silicate and 3-methacryloxypropyltrimethoxysilane on polysorbate templates. The resultant PMOSs were fabricated with bismuth and cerium oxides to formulate Bi-PMOS and Ce-PMOS, respectively. These materials showed photo-degradations of methylene blue (MB, 74.7% and 41.1% with Bi-PMOS and Ce-PMOS, respectively) and methyl orange (MO, 53.2% and 39.4% with Bi-PMOS and Ce-PMOS, respectively). Such efficient photo-degradations were attributed to the precise doping of metallic nodes of Bi 2 O 3 and CeO 2 on the porous structure of PMOS with high surface area. The results also showed that Bi and Ce were more effective in PMOS support for photo-degradation of dyes as the support provides more lifetime to photo-generated electron-hole pairs than other materials. Moreover, active reusability and high degradation efficiencies of Bi-PMOS and Ce-PMOS proved them better analytical tools to reduce organic pollutants under visible lights. © 2021 Water Environment Federation • Practitioner points• The oxides of bismuth and cerium have impressive photocatalytic characteristics.• New material energizing mesoporous organosilica with bismuth and cerium for photo-degradation of methylene blue and methyl orange in water. • The use of an efficient catalyst to reduce the organic pollutants by using an energetic periodic mesoporous organosilica (PMOS) supported with bismuth (Bi-PMOS) and cerium (Ce-PMOS).

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“…6,18,19 Numerous efforts have been devoted to exploring an in-depth understanding of "conversion-type" metal oxides to pursue advanced materials for next-generation batteries. [13][14][15][16]20,21 Mechanism of "conversion-type" anodes during the charge-discharge process can be represented as eqn (1): 14,15…”

Section: Introductionmentioning

confidence: 99%

A universal electrochemical lithiation–delithiation method to prepare low-crystalline metal oxides for high-performance hybrid supercapacitors

Chen

et al. 2021

RSC Adv.

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Preforming abundant surface cobalt hydroxyl groups on low crystalline flowerlike Co3(Si2O5)2(OH)2 for enhancing catalytic degradation performances with a critical nonradical reaction

Cited by 103 publications

References 101 publications

Tuning of Persulfate Activation from a Free Radical to a Nonradical Pathway through the Incorporation of Non-Redox Magnesium Oxide

Tuning of Persulfate Activation from a Free Radical to a Nonradical Pathway through the Incorporation of Non-Redox Magnesium Oxide

Energizing periodic mesoporous organosilica (PMOS) with bismuth and cerium for photo‐degrading methylene blue and methyl orange in water

A universal electrochemical lithiation–delithiation method to prepare low-crystalline metal oxides for high-performance hybrid supercapacitors

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