Facile assembly and enhanced visible-light-driven photocatalytic activity of S-scheme BiOBr/g-C3N4 heterojunction for degrading xanthate in wastewater

Yuan, Fei; Zheng, Yufei; Gao, Dengzheng; Wang, Li; Hu, Xiaolong

doi:10.1016/j.molliq.2022.120279

Cited by 39 publications

(6 citation statements)

References 56 publications

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“…Obviously, the characteristic peak of EX at 301 nm decreased with the extension of time, demonstrating that EX was effectively degraded in the PMS activation process. Moreover, the EX peak at 226 nm disappeared after 10 min, and two new peaks appeared at 206 and 348 nm, which may be CS 2 and ethyl xanthate peroxide (EXP, C 2 H 5 OCS 2 O – ) generated by decomposition of EX . Furthermore, the peaks of CS 2 and EXP decreased significantly with the increase of reaction time, demonstrating that EX may be eventually degraded into CO 2 , H 2 O, and SO 4 2– .…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the EX peak at 226 nm disappeared after 10 min, and two new peaks appeared at 206 and 348 nm, which may be CS 2 and ethyl xanthate peroxide (EXP, C 2 H 5 OCS 2 O − ) generated by decomposition of EX. 32 Furthermore, the peaks of CS 2 and EXP decreased significantly with the increase of reaction time, demonstrating that EX may be eventually degraded into CO 2 , H 2 O, and SO 4 2− . Similarly, BX was first decomposed into CS 2 and butyl xanthate peroxide (BXP, C 4 H 9 OCS 2 O − ) over time, 33 and finally mineralized into CO 2 , H 2 O, and SO 4 2− .…”

Section: Catalytic Performance and Degradation Mechanism For Mpwmentioning

confidence: 94%

“…Moreover, the EX peak at 226 nm disappeared after 10 min, and two new peaks appeared at 206 and 348 nm, which may be CS 2 and ethyl xanthate peroxide (EXP, C 2 H 5 OCS 2 O − ) generated by decomposition of EX. 32 Furthermore, the peaks of CS 2 and EXP decreased significantly with the increase of reaction time, demonstrating that EX may be eventually degraded into CO . For DDTC, the characteristic peak at 257 and 282 nm disappeared after 20 min, while the peak of CS 2 appeared and gradually decreased with the increase of time, indicating that DDTC was effectively degraded.…”

Section: Catalytic Performance and Degradation Mechanism For Mpwmentioning

confidence: 99%

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Peroxymonosulfate Activation by Iron Sulfide Minerals for Degradation of Various Thiol Collectors in Mineral Processing Wastewater: Performance, Mechanism, and Structure–Activity Relationship

Wu,

Sun,

Meng

et al. 2023

ACS EST Water

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The quantity of mineral processing wastewater (MPW) is large and contains residual thiol collectors, which easily cause environmental pollution. Herein, we systematically investigated the catalytic performances and underlying mechanisms of iron sulfide minerals (pyrite, marcasite, and pyrrhotite) for the activation of peroxymonosulfate (PMS) to treat MPW containing various thiol collectors (ethyl xanthate (EX), butyl xanthate (BX), diethyldithiocarbamate (DDTC)). Density functional theory (DFT) calculation results indicated that electron-rich Fe atoms in pyrite and marcasite acted as electron donors for PMS adsorption and cleavage, while pyrrhotite with electron-deficient Fe atoms has no PMS adsorption site. In particular, pyrite has stronger reactivity in comparison with marcasite due to more electron transfer and the lower thermodynamic and kinetic energy barrier of the reaction. Meanwhile, the efficient electron transfer of pyrite with strong F−S covalent bonds facilitated the regeneration of Fe(II), thus improving the catalytic performance. As a result, pyrite exhibited the highest total organic carbon (TOC) removal efficiency for real MPW, which was 1.12-fold and 1.63-fold of that on marcasite and pyrrhotite, respectively. This study highlights the structure−activity relationship of iron sulfide minerals and provides new insights into the PMS activation mechanism of sulfur-containing catalysts for MPW treatment.

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Section: Resultsmentioning

confidence: 99%

Section: Catalytic Performance and Degradation Mechanism For Mpwmentioning

confidence: 94%

“…Moreover, the EX peak at 226 nm disappeared after 10 min, and two new peaks appeared at 206 and 348 nm, which may be CS 2 and ethyl xanthate peroxide (EXP, C 2 H 5 OCS 2 O − ) generated by decomposition of EX. 32 Furthermore, the peaks of CS 2 and EXP decreased significantly with the increase of reaction time, demonstrating that EX may be eventually degraded into CO . For DDTC, the characteristic peak at 257 and 282 nm disappeared after 20 min, while the peak of CS 2 appeared and gradually decreased with the increase of time, indicating that DDTC was effectively degraded.…”

Section: Catalytic Performance and Degradation Mechanism For Mpwmentioning

confidence: 99%

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Peroxymonosulfate Activation by Iron Sulfide Minerals for Degradation of Various Thiol Collectors in Mineral Processing Wastewater: Performance, Mechanism, and Structure–Activity Relationship

Wu,

Sun,

Meng

et al. 2023

ACS EST Water

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“…[94,95] For example, Yuan et al prepared BiOCl/g-C 3 N 4 and BiOBr/g-C 3 N 4 S-scheme photocatalysts by an in situ growth method. [96,97] These composite photocatalysts displayed a remarkable degradation rate of ethyl xanthate. Li et al fabricated a 2D/2D BiOI/g-C 3 N 4 S-scheme photocatalyst by an electrostatic self-assembly and d) element mappings of BiOBr/NiO composite.…”

Section: D Biox-based S-scheme Photocatalystsmentioning

confidence: 99%

Construction of 2D S‐Scheme Heterojunction Photocatalyst

Zhu,

Sun,

Zhao

et al. 2023

Advanced Materials

139

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Semiconductor photocatalytic technology holds immense promise for converting sustainable solar energy into chemically storable energy, with significant applications in the realms of energy and the environment. However, the inherent issue of rapid recombination of photogenerated electrons and holes hinders the performance of single photocatalysts. To overcome this challenge, the construction of 2D S‐scheme heterojunction photocatalysts emerges as an effective strategy. The deliberate design of dimensionality ensures a substantial interfacial area; while, the S‐scheme charge transfer mechanism facilitates efficient charge separation and maximizes redox capabilities. This review commences with a fresh perspective on the charge transfer mechanism in S‐scheme heterojunctions, followed by a comprehensive exploration of preparation methods and characterization techniques. Subsequently, the recent advancements in 2D S‐scheme heterojunction photocatalysts are summarized. Notably, the mechanism behind activity enhancement is elucidated. Finally, the prospects for the development of 2D S‐scheme photocatalysts are presented.

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“…Furthermore, Xanthate poses significant dangers to human livers, blood, and nervous systems [7]. Especially, the decomposition of xanthate will generate CS 2 gas, which irreversibly damages the respiratory system [8]. In order to highly reduce the hazards released by xanthate-containing wastewater, some proactive and effective measures should be implemented.…”

Section: Introductionmentioning

confidence: 99%

Visible-Light-Driven BiOBr-TiO2-Attapulgite Photocatalyst with Excellent Photocatalytic Activity for Multiple Xanthates

Qi,

Zhao,

Jiang

et al. 2023

Catalysts

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The novel ternary composites BiOBr-TiO2-attapulgite (BTA) were synthesized using a simple hydrothermal and water-bath method, exhibiting excellent photocatalytic performance to multiple xanthates. For the BTA photocatalyst, TiO2 and BiOBr were uniformly loaded onto the surface of acid-activated attapulgite. As a widely used collector in mining processes, sodium ethyl-xanthate (SEX) was selected as the target pollutant due to its high toxicity. The BTA ternary photocatalyst demonstrated significantly higher adsorption and photocatalytic degradation performance compared to TiO2 nanoparticles, BiOBr nanosheets, and BiOBr-TiO2 heterojunction. Structural characterization and experimental results indicated that the exceptional photocatalytic degradation efficiency of BTA was mainly attributed to the formation of a heterojunction between BiOBr and TiO2, as well as the presence of additional active adsorption sites provided by attapulgite. Free radical scavenging experiments and EPR results confirmed that the photogenerated holes were the predominant active species in photodegrading SEX throughout the entire experiment. The LC-MS results provided insight into potential degradation pathways of SEX. This research demonstrates that BTA, as a novel triple composite material, achieves rapid and complete degradation to 20 mg/L SEX within 20 min. This work presents a novel approach to synthesize mineral-based photocatalysts, which have broad prospects for application in flotation wastewater treatment.

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Facile assembly and enhanced visible-light-driven photocatalytic activity of S-scheme BiOBr/g-C3N4 heterojunction for degrading xanthate in wastewater

Cited by 39 publications

References 56 publications

Peroxymonosulfate Activation by Iron Sulfide Minerals for Degradation of Various Thiol Collectors in Mineral Processing Wastewater: Performance, Mechanism, and Structure–Activity Relationship

Peroxymonosulfate Activation by Iron Sulfide Minerals for Degradation of Various Thiol Collectors in Mineral Processing Wastewater: Performance, Mechanism, and Structure–Activity Relationship

Construction of 2D S‐Scheme Heterojunction Photocatalyst

Visible-Light-Driven BiOBr-TiO2-Attapulgite Photocatalyst with Excellent Photocatalytic Activity for Multiple Xanthates

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