Synthesis scaly Ag-TiO2 loaded fly ash magnetic bead particles for treatment of xanthate wastewater

Li, Guanchao; Teng, Quincy; Sun, Beilei; Yang, Zhichao; Liu, Shengyu; Zhu, Xuan

doi:10.1016/j.colsurfa.2021.126795

Cited by 41 publications

(11 citation statements)

References 24 publications

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“…Practically, the pH value of mineral processing wastewater containing residual xanthate is usually around 10 . Thus, the synthesized 30BFO/ZIS photocatalyst is of great potential to treat actual wastewater …”

Section: Resultsmentioning

confidence: 99%

“…67 Thus, the synthesized 30BFO/ZIS photocatalyst is of great potential to treat actual wastewater. 1 3.5.4. Ca 2+ / Mg 2+ Ions in Xanthate Solution.…”

Section: Ph Of Xanthate Solutionmentioning

confidence: 99%

“…Xanthate is widely used as a collector for sulfide ore flotation because of its low cost, strong collection ability, and high solubility. However, xanthate is toxic, and it may damage the human nervous system if discharged without treatment . Traditional treatment methods, such as acid–base neutralization, natural degradation, adsorption, biological treatment, and Fenton method, are limited by their low degradation efficiencies, secondary pollution, long processing time, or high costs. − Thus, it is necessary to develop an eco-friendly and cost-effective method to control the discharge of xanthate organics …”

Section: Introductionmentioning

confidence: 99%

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Photodegradation of Xanthate Using a Bi₂Fe₄O₉/ZnIn₂S₄Heterojunction: Experimental and DFT Studies

Nie,

Liu,

Liu

et al. 2023

Ind. Eng. Chem. Res.

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Bi 2 Fe 4 O 9 /ZnIn 2 S 4 (BFO/ZIS) composites are synthesized by using a facile impregnation method and tested for the photocatalytic degradation of xanthate for the first time. The effects of multiple parameters, including catalyst dosage and the pH value of solution, on xanthate photodegradation are investigated systematically. Furthermore, the photocatalytic mechanisms of BFO/ZIS are proposed based on various characterizations and density functional theory calculations. Results show that the degradation efficiency of 30BFO/ZIS is 98.25% during 90 min of visible light irradiation, which is 2.63 and 2.89 times higher than that of pure ZIS and BFO, respectively. This is mainly because the type II heterojunction formed between BFO and ZIS improves the separation of photogenerated carriers. Furthermore, the xanthate photodegradation efficiency of 30BFO/ZIS decreases slightly from 98.25 to 92.86% after four cycles, indicating its excellent durability and stability. Finally, the chemical oxygen demand (COD) removal efficiency of 30BFO/ZIS is up to 81.06%, exhibiting a high degree of mineralization.

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Section: Resultsmentioning

confidence: 99%

“…67 Thus, the synthesized 30BFO/ZIS photocatalyst is of great potential to treat actual wastewater. 1 3.5.4. Ca 2+ / Mg 2+ Ions in Xanthate Solution.…”

Section: Ph Of Xanthate Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photodegradation of Xanthate Using a Bi₂Fe₄O₉/ZnIn₂S₄Heterojunction: Experimental and DFT Studies

Nie,

Liu,

Liu

et al. 2023

Ind. Eng. Chem. Res.

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“…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− . 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%

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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“…Photocatalysis is an advanced oxidation technology for wastewater treatment; it requires no additional energy and has advantages such as low cost, high efficiency, good performance, and nonselective degradation. − Consequently, it is attracting attention as a promising environmentally friendly strategy. However, the application of photocatalysis technology is limited by drawbacks, including low quantum efficiency and poor light utilization, which result in slow and inefficient photodegradation and limit the feasibility of large-scale industrial applications. − The variety of organic pollutants in wastewater further decreases the feasibility, although photocatalytic oxidation is theoretically nonselective. − Photocatalytic oxidation is known to depend on photogenerated holes and reactive oxygen species (ROS); however, the photodegradation mechanism and rate vary significantly depending on the pollutant being degraded and the properties of the photocatalysts, including the band gap structure, adsorption behavior, surface charge, generated ROS, and oxidizability of holes. − In addition, the complexity and variability of real wastewater compared to the simulated wastewater typically used in research further reduce the application potential of photocatalysis technology. − …”

Section: Introductionmentioning

confidence: 99%

Treatment of Variable Complex Mixed Dye Wastewater by Photodegradation with a Photocatalyst Gradation Strategy

Tang

Gong

et al. 2021

Ind. Eng. Chem. Res.

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Photocatalysis is a promising advanced oxidation technology for treating wastewater; however, the complexity, diversity, and variability of actual wastewater make its application difficult at the current level of technology. In this work, a photocatalyst gradation strategy is proposed in which the specific photocatalysts Ag2O, NaBiO3, and BiOCl0.75Br0.25 are combined to treat the specific pollutants methyl orange, methylene blue, and rhodamine B, as well as their mixtures. The photocatalyst ratio is adjusted on the basis of big data analysis to photodegrade variable mixed dye solutions rapidly and efficiently. The results demonstrate positive synergistic effects among the photocatalysts, which can completely decolorize a 30 mg/L mixed dye solution at a ratio of 1:1:1 in 15 min. When big data analysis is applied, mixed dye solutions with random dye ratios are purified sufficiently to meet the standard using a graded photocatalyst combination based on the predictions of the trained model. This work provides a reference strategy for the treatment of complex variable wastewater.

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Synthesis scaly Ag-TiO2 loaded fly ash magnetic bead particles for treatment of xanthate wastewater

Cited by 41 publications

References 24 publications

Photodegradation of Xanthate Using a Bi₂Fe₄O₉/ZnIn₂S₄Heterojunction: Experimental and DFT Studies

Photodegradation of Xanthate Using a Bi₂Fe₄O₉/ZnIn₂S₄Heterojunction: Experimental and DFT Studies

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

Treatment of Variable Complex Mixed Dye Wastewater by Photodegradation with a Photocatalyst Gradation Strategy

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Synthesis scaly Ag-TiO2 loaded fly ash magnetic bead particles for treatment of xanthate wastewater

Cited by 41 publications

References 24 publications

Photodegradation of Xanthate Using a Bi2Fe4O9/ZnIn2S4Heterojunction: Experimental and DFT Studies

Photodegradation of Xanthate Using a Bi2Fe4O9/ZnIn2S4Heterojunction: Experimental and DFT Studies

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

Treatment of Variable Complex Mixed Dye Wastewater by Photodegradation with a Photocatalyst Gradation Strategy

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Product

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Photodegradation of Xanthate Using a Bi₂Fe₄O₉/ZnIn₂S₄Heterojunction: Experimental and DFT Studies

Photodegradation of Xanthate Using a Bi₂Fe₄O₉/ZnIn₂S₄Heterojunction: Experimental and DFT Studies