Visible light-driven photocatalytic degradation of Microcystin-LR by Bi2WO6/Reduced graphene oxide heterojunctions: Mechanistic insight, DFT calculation and degradation pathways

Zhan, Mingming; Yang, Hong; Fang, Zhi; Qiu, Daping

doi:10.1016/j.chemosphere.2023.138105

Cited by 14 publications

(3 citation statements)

References 64 publications

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“…For future works, it would be beneficial to investigate the influence of humic acid, coexisting anions, and different waterbodies on the efficiency of adsorption similar to literature 18 , 19 . Furthermore, the impact of contact time on the adsorption of STX and MCLR onto biochar at different concentrations will be explored.…”

Section: Discussionmentioning

confidence: 99%

“…For example, chemical processes are only recommended as a last resort option as the negative aspects outweigh the positives, due to (1) proliferation of lysing algal cells, (2) potential harm to the aquatic ecosystem, and (3) the potential of introduction of novel toxins effects to aquatic organisms 16 , 17 . Additionally, chemical process such as advanced oxidation has proven to be an excellent upcoming mitigation technique for the degradation of Microcystin-LR through the use of novel photocatalysts 18 , 19 . While superior degradation efficiency has been reported for larger hydrophobic molecules like Microcystin-LR similar performance is not shown for smaller hydrophilic molecules like Anatoxin-a and Saxitoxin 20 , 21 .…”

Section: Introductionmentioning

confidence: 99%

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Influence of biochar on the removal of Microcystin-LR and Saxitoxin from aqueous solutions

Chambers,

Grimes,

Fire

et al. 2024

Sci Rep

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The present study assessed the effective use of biochar for the adsorption of two potent HAB toxins namely, Microcystin-LR (MCLR) and Saxitoxin (STX) through a combination of dosage, kinetic, equilibrium, initial pH, and competitive adsorption experiments. The adsorption results suggest that biochar has excellent capabilities for removing MCLR and STX, with STX reporting higher adsorption capacities (622.53–3507.46 µg/g). STX removal required a minimal dosage of 0.02 g/L, while MCLR removal needed 0.4 g/L for > 90%. Similarly, a shorter contact time was required for STX removal compared to MCLR for > 90% of toxin removed from water. Initial pH study revealed that for MCLR acidic conditions favored higher uptake while STX favored basic conditions. Kinetic studies revealed that the Elovich model to be most suitable for both toxins, while STX also showed suitable fittings for Pseudo-First Order and Pseudo-Second Order in individual toxin systems. Similarly, for the Elovich model the most suited kinetic model for both toxins in presence of each other. Isotherm studies confirmed the Langmuir–Freundlich model as the best fit for both toxins. These results suggest adsorption mechanisms including pore filling, hydrogen bonding, π–π interactions, hydrophobic interactions, electrostatic attraction, and dispersive interactions.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of biochar on the removal of Microcystin-LR and Saxitoxin from aqueous solutions

Chambers,

Grimes,

Fire

et al. 2024

Sci Rep

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“…To overcome this limitation, these photocatalysts combined with other materials to reduce the recombination rate. Graphene and its derivations are wildly used as metal-free co-catalysts to enhance photocatalytic performance by promoting charge transfer and reducing the rate of electron–hole recombination 24 – 31 .…”

Section: Introductionmentioning

confidence: 99%

Novel synthesis of siligraphene/tungstates (g-SiC/AWO) with promoted transportation of photogenerated charge carriers via direct Z-scheme heterojunctions

Afsharpour

Darvishi-Farash

2023

Sci Rep

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We developed here the efficient photocatalysts for the removal of high concentrations of tetracycline under visible light by immobilizing the AWO (A = Ag, Bi, Na) nanocrystals on the surface of siligraphene (g-SiC) nanosheets. The g-SiC/AWO composites was synthesized by magnesiothermic synthesis of g-SiC and sonochemical immobilization of tungstates. These new heterojunctions of g-SiC/tungstates show superior photocatalytic activities in the degradation of high concentrations of tetracycline and 97, 98, and 94% of tetracycline were removed by using low amounts of g-SiC/Ag2WO4, g-SiC/Bi2WO6, and g-SiC/Na2WO4 catalysts, respectively. Based on band structures, the band gaps reduce and the photocatalytic activities were extremely enhanced due to the shortening of electron transfer distance through the Z-scheme mechanism. Also, the graphenic structure of g-SiC is another parameter that was effective in improving photocatalytic performance by increasing the electron transfer and decreasing the rate of electron–hole recombination. Furthermore, the π back-bonding of g-SiC with metal atoms increases the electron–hole separation to enhance the photocatalytic activity. Interestingly, g-SiC composites (g-SiC/AWO) showed much higher photocatalytic properties compared to graphene composites (gr/AWO) and can remove the tetracycline even at dark by producing the oxygenated radicals via adsorption of oxygen on the positive charge of Si atoms in siligraphene structure.

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Inhibitory effect of malonic acid on Microcystis aeruginosa: Cell morphology, oxidative stress and gene expression

Tao,

Niu,

Zhang

et al. 2024

Algal Research

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Visible light-driven photocatalytic degradation of Microcystin-LR by Bi2WO6/Reduced graphene oxide heterojunctions: Mechanistic insight, DFT calculation and degradation pathways

Cited by 14 publications

References 64 publications

Influence of biochar on the removal of Microcystin-LR and Saxitoxin from aqueous solutions

Influence of biochar on the removal of Microcystin-LR and Saxitoxin from aqueous solutions

Novel synthesis of siligraphene/tungstates (g-SiC/AWO) with promoted transportation of photogenerated charge carriers via direct Z-scheme heterojunctions

Inhibitory effect of malonic acid on Microcystis aeruginosa: Cell morphology, oxidative stress and gene expression

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