Efficient persulfate activation by hematite nanocrystals for degradation of organic pollutants under visible light irradiation: Facet-dependent catalytic performance and degradation mechanism

Guo, Tao; Jiang, Lisha; Wang, Kai; Li, Yuan; Huang, Hongfeng; Wu, Xiaoyong; Zhang, Gaoke

doi:10.1016/j.apcatb.2021.119883

Cited by 174 publications

(43 citation statements)

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“…Peroxymonosulfate (PMS) activation has emerged as a promising process that can generate highly reactive radicals for the degradation of organic contaminants in the absence of any irradiating source. , PMS possesses an asymmetric structure and a long superoxide O–O bond, which facilitates the activation of the molecule in the presence of a suitable catalyst . Several metal oxides have been extensively used for PMS activation as catalysts; − however, the use these materials has many drawbacks including inefficiency, nonrecyclability, and toxicity . Thus, the development of a heterogeneous catalyst that can overcome the drawbacks of metal oxides is highly important.…”

Section: Introductionmentioning

confidence: 99%

Cu₂S@Bi₂S₃ Double-Shelled Hollow Cages as a Nanocatalyst with Substantial Activity in Peroxymonosulfate Activation for Atrazine Degradation

ElMetwally

Goodarzi

Meier

et al. 2021

ACS Appl. Nano Mater.

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Metal dichalcogenides are promising candidates for heterogeneous catalysis. Designing them as a double-shelled hollow nanostructure can enhance their performance owing to the high surface area provided by the hollow inner space. Herein, we demonstrate a multistage templating approach to prepare double-shelled cages with Bi 2 S 3 nanoparticles as an outer shell and Cu 2 S as an inner shell. A facile deposition method, coupled with a benign sulfidation process, has been developed to prepare such a double-shelled hollow structure. The prepared Cu 2 S@Bi 2 S 3 double-shelled cages demonstrated a substantial catalytic reactivity in peroxymonosulfate (PMS) activation for the degradation of atrazine in the dark. Such performance is attributed to the synergy between Cu 2 S and Bi 2 S 3 in activating PMS, which promotes radical generation and enhances the catalytic performance. Our mechanistic studies revealed that hydroxyl radicals and singlet oxygen are the dominant species generated during atrazine degradation.

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Section: Introductionmentioning

confidence: 99%

Cu₂S@Bi₂S₃ Double-Shelled Hollow Cages as a Nanocatalyst with Substantial Activity in Peroxymonosulfate Activation for Atrazine Degradation

ElMetwally

Goodarzi

Meier

et al. 2021

ACS Appl. Nano Mater.

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“… 62 Besides, this might improve the interaction between the catalyst and organic contaminants and make it more favorable for degradation reactions. 63 , 64 It is also proposed that the existence of oxygen vacancies in the system can provide a negative charge surface that could improve the electrostatic contact between the catalyst surface and the cationic dye molecules. 65 As far as the catalytic reaction is concerned, it is well known that the typical Fenton reaction is characterized by the response of aqueous Fe 2+ with H 2 O 2 to produce a HO • radical, which is the dominant oxidizing agent and interacts with dyes to decolorate them.…”

Section: Resultsmentioning

confidence: 99%

Self-Assembled Hierarchical Cu_xO@C₁₈H₃₆O₂ Nanoflakes for Superior Fenton-like Catalysis over a Wide Range of pH

et al. 2021

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A novel copper-based catalyst supported by a long-chain hydrocarbon stearic acid (Cu x O@C 18 H 36 O 2 ) was synthesized by a hydrothermal method and double replacement reactions. The as-prepared catalyst is shown as self-assembled hierarchical nanoflakes with an average size of ∼22 nm and a specific surface area of 51.4 m 2 g –1 . The catalyst has a good performance on adsorption as well as Fenton-like catalytic degradation of Rhodamine B (RhB). The catalyst (10 mg/L) showed an excellent adsorption efficiency toward RhB (20 mg/L) for pH ranging from 5 to 13, with the highest adsorption rate (99%) exhibited at pH 13. The Fenton-like catalytic degradation reaction of RhB (20 mg/L) by Cu x O@C 18 H 36 O 2 nanoflakes was effective over a wide range of pH of 3–11, and • OH radicals were generated via Cu 2 O/H 2 O 2 interactions in acidic conditions and CuO/H 2 O 2 reactions in a neutral solution. The highest efficiency catalytic degradation of RhB (20 mg/L) was 99.2% under acidic conditions (pH = 3, H 2 O 2 = 0.05 M), with an excellent reusability of 96% at the 6th cycle. The results demonstrated that the as-prepared Cu x O@C 18 H 36 O 2 nanoflakes are an efficient candidate for wastewater treatment, with excellent adsorption capacity and superior Fenton-like catalytic efficiency and stability for RhB.

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“…These photo-generated ·OH radicals take part in dye degradation and are mainly responsible in enhancing the degradation process. To confirm the generation of ·OH radicals, we performed the degradation process in the presence of tert -butanol ( t -BuOH), which acts as the ·OH radical scavenger. ,, In the presence of t -BuOH, the degradation rate of MB was drastically reduced (Figure S7). Thus, insights into the dye degradation using iron oxide-based materials further point to the fundamental significance in understanding the photocatalysis and at the same time extending the broad applicability of such naturally occurring semiconducting nanomaterials.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Template-Free Iron Oxyhydroxide Nanorods for Sunlight-Driven Photo-Fenton Catalysis

2021

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Designing a photocatalyst with high efficiency using semiconductor materials emerges as a promising approach for the treatment of wastewater. At the same time, it is very essential to develop nondestructive, green, and sustainable techniques for the degradation of refractory pollutants. Here, we have demonstrated a facile route to prepare iron oxyhydroxide nanorods (β-FeOOH) without employment of any templating agent via a light-driven solution chemistry pathway and explored the as-prepared nanorods as the photo-Fenton catalyst under solar light irradiation. The photocatalytic experiments were performed toward the degradation of the aqueous solution of two different pollutants, namely, methylene blue and rhodamine B dyes. We have illustrated the effect of pH of the solution together with the concentration of H 2 O 2 during the degradation process and optimized the solution pH as well as the H 2 O 2 concentration. The superb photocatalytic efficiency of β-FeOOH is attributed to the generation of reactive oxygen species in the presence of solar light, and these photo-produced reactive oxygen species assist the degradation process. The excellent photocatalytic efficacy and sustainability of β-FeOOH nanorods along with their effortless synthesis approach point to a cost-effective and environmentally benign pathway in fabricating a highly active photocatalyst for the degradation of organic dyes.

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Efficient persulfate activation by hematite nanocrystals for degradation of organic pollutants under visible light irradiation: Facet-dependent catalytic performance and degradation mechanism

Cited by 174 publications

References 50 publications

Cu₂S@Bi₂S₃ Double-Shelled Hollow Cages as a Nanocatalyst with Substantial Activity in Peroxymonosulfate Activation for Atrazine Degradation

Cu₂S@Bi₂S₃ Double-Shelled Hollow Cages as a Nanocatalyst with Substantial Activity in Peroxymonosulfate Activation for Atrazine Degradation

Self-Assembled Hierarchical Cu_xO@C₁₈H₃₆O₂ Nanoflakes for Superior Fenton-like Catalysis over a Wide Range of pH

Synthesis of Template-Free Iron Oxyhydroxide Nanorods for Sunlight-Driven Photo-Fenton Catalysis

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Efficient persulfate activation by hematite nanocrystals for degradation of organic pollutants under visible light irradiation: Facet-dependent catalytic performance and degradation mechanism

Cited by 174 publications

References 50 publications

Cu2S@Bi2S3 Double-Shelled Hollow Cages as a Nanocatalyst with Substantial Activity in Peroxymonosulfate Activation for Atrazine Degradation

Cu2S@Bi2S3 Double-Shelled Hollow Cages as a Nanocatalyst with Substantial Activity in Peroxymonosulfate Activation for Atrazine Degradation

Self-Assembled Hierarchical CuxO@C18H36O2 Nanoflakes for Superior Fenton-like Catalysis over a Wide Range of pH

Synthesis of Template-Free Iron Oxyhydroxide Nanorods for Sunlight-Driven Photo-Fenton Catalysis

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Cu₂S@Bi₂S₃ Double-Shelled Hollow Cages as a Nanocatalyst with Substantial Activity in Peroxymonosulfate Activation for Atrazine Degradation

Cu₂S@Bi₂S₃ Double-Shelled Hollow Cages as a Nanocatalyst with Substantial Activity in Peroxymonosulfate Activation for Atrazine Degradation

Self-Assembled Hierarchical Cu_xO@C₁₈H₃₆O₂ Nanoflakes for Superior Fenton-like Catalysis over a Wide Range of pH