Technologies for the Extraction and Post-extraction of Stevia rebaudiana Leaves

Iwuozor, Kingsley O.; Emmanuel, Stephen Sunday; Ahmed, Musa Opeyemi; Idris, Adepoju Moronkola; Emenike, Ebuka Chizitere; Saliu, Oluwaseyi Damilare; Qudus, Adeyemi Hafees; Adeniyi, Adewale George

doi:10.1007/s42250-023-00787-0

Cited by 11 publications

(2 citation statements)

References 177 publications

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“…It was also revealed that most of the photocatalytic degradation data fit the Langmuir isotherm model better, which indicates that the adsorption process involved during photocatalytic degradation is monolayer at the surface of the biogenic NPs, while the kinetic follows both PFO and PSO, with PFO coming to the fore in most studies, which shows that the main mechanism of adsorption that occurs during the photocatalytic degradation of OC and OP using biogenic NPs is physical adsorption. Furthermore, it was discovered that plant extract is the most widely employed capping agent or bioreductant for the biosynthesis of various biogenic NPs reported, and this might be due to the availability and ease of access of plants as a biogenic entity and the plethora of phytochemicals containing hydroxyl, carbonyl, and other oxygenated functional groups present in the plant [135,136] . This study also discloses that Au, Ag, and Fe‐based biogenic NPs are the most widely studied biogenic NPs for OC and OP degradation, and this was perceived to be a result of their intrinsic excellent properties like fast light response, good surface area, and so on.…”

Section: Discussionmentioning

confidence: 99%

Biosynthesized Metallic Nanoarchitecture for Photocatalytic Degradation of Emerging Organochlorine and Organophosphate Pollutants: A Review

Emmanuel,

Idris,

Olawoyin

et al. 2024

ChemistrySelect

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The use of efficacious and cost‐effective pesticides (OP and OC) has undoubtedly proven to be a blessing and a baron because these pesticides are safeguarding the world from food insecurity. Unfortunately, their presence in aquatic bodies brings about an upsurge in water pollution. Amazingly, the photocatalytic degradation approach utilizing biogenic nanoparticles (BNPs) is a trendy state‐of‐the‐art approach and has been established to be a sustainable methodology for the complete mineralization of contaminants into harmless molecules. Thus, this work holistically explores the use of BNPs for photocatalytic degradation of OP and OC. Based on the review, it was found that the least amount of time needed for degradation was less than 5 minutes, while the maximum degradation efficiency was >80 %. The dominant radicals participating in the degradation are ⋅OH and O2⋅ and this radical dominance was enhanced by the oxygenated functional groups present in the biogenic entities employed for the biosynthesis of BNPs. The photocatalytic degradation data fits the pseudo‐first‐order and Langmuir isotherm models (R2 > 0.9), which indicates that the main adsorption mechanisms involved during electron‐hole pair formation and photocatalytic degradation are physisorption and monolayer at the surface of the BNPs. BNPs can sustain a >80 % degradation efficiency for approximately 5 cycles and are reusable for up to 8 cycles. It was also revealed that plants constitute 80 % of the engaged biogenic entities for BNP synthesis. Ultimately, this work offers novel avenues and future research hotspots that might accelerate the use of BNPs for sustainable agricultural and wastewater management practices.

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Section: Discussionmentioning

confidence: 99%

Biosynthesized Metallic Nanoarchitecture for Photocatalytic Degradation of Emerging Organochlorine and Organophosphate Pollutants: A Review

Emmanuel,

Idris,

Olawoyin

et al. 2024

ChemistrySelect

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“…Also, for future work, the lifecycle analyses of nano-photocatalyst fabrication and utilization, and cost analysis be performed. Moreover, there is no work on the use of biogenic NPs (NPs fabricated using biological entities like plants and microorganisms that contain plethora of hydroxyl and oxygenated functional groups [99][100][101][102][103][104] ) for photocatalytic degradation of maxilon dyes and this could be an interesting future research hotspot. Lastly, since maxilon dyes are one of the most emerging colourful dyes, their photocatalytic degradation in real-life scenarios on an industrial scale needs to be explored.…”

Section: Knowledge Gap and Future Research Directionmentioning

confidence: 99%

Photocatalytic Degradation of Maxilon Dye Pollutants using Nano‐Architecture Functional Materials: A Review

Emmanuel,

Adesibikan,

Olawoyin

et al. 2024

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The most essential task in the twenty‐first century is to fight the alarming growing pollution in the aquatic body in which effluent of one of the most colouring dye categories called maxilon dye is a major contributor. This review thus specifically focuses on the use of nanoparticles (NPs) for photocatalytic degradation of maxilon dye contaminants in water bodies. The work empirically presented the performance evaluation of NPs in degrading maxilon dyes under light irradiation alongside the underlying operational photocatalytic degradation mechanism. The stability of NPs was also critically analyzed by looking at the regenerability and reusability of expended NPs. From the study, it was discovered that ⋅OH and O2⋅ played a vital role in the genesis of the oxidizing capacity of NPs for the photocatalytic breakdown of maxilon dye. Moreover, it was found that the degradation performance of most NPs is greater than 80 % and the shortest degradation period is < 1 hour with pseudo‐first‐order (PFO) being the most common kinetic best‐fit to describe the adsorption process that occurred shortly before and during the degradation operation. At the end, knowledge gaps were identified in the area of regenerability, the lifecycle analyses of nano‐photocatalyst fabrication and utilization, cost analysis for industrial scale‐up, maxilon dye ecotoxicological study, and degradation pathways. The findings of this study can open up insightful innovation for readers and industries that are interested in pursuing zero water insecurity.

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A review on eco‐sustainable photocatalytic degradation of pharmaceutical pollutants using biosynthesized nanoparticles

Emmanuel,

Esan,

Afigo

et al. 2024

J Chinese Chemical Soc

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Pharmaceutical substances, a pill for every ill, have become a sweet poison by remarkably boosting the global economy as well as human and animal wellness and at the same time causing environmental pollution, especially in the aquatic ecosystem, and this has led to a fatal diminution in the availability of clean water and upsurge in water insecurity. Notably, traditional techniques and materials have been employed to clean up pharmaceutical pollutants (PP) from aquatic bodies; however, they have come under controversy because they require hazardous chemicals and cannot fully mineralize stubborn PPs. Interestingly, the photocatalytic degradation approach employing eco‐benign biosynthesized nanoparticles (BNP) is an avant‐garde practice and has shown to be an eco‐sustainable method that can fully mineralize PPs into harmless molecules. Thus, this study critically explores the application of BNPs for the photocatalytic degradation of PPs. The review revealed that the greatest degradation efficacy of BNPs was greater than 80% in most cases, and that the least amount of time required was around 10 min. In addition, the oxygen‐containing functional groups found in the biological sources used for the fabrication of BNPs contributed to the supremacy of •OH and O2• radicals in the degradation operation. Also, the photocatalytic degradation kinetic data was well modeled by pseudo‐first order, and this indicates that •OH was more involved in the PPs degradation operation than O2•. Moreso, BNPs have excellent reusability potential (>5 rounds) while maintaining inherent structural integrity. Techno‐economic analysis revealed that BNPs are cost‐effective, costing about $1.5/1,000,000 mL of pharmaceutical wastewater on average.

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Technologies for the Extraction and Post-extraction of Stevia rebaudiana Leaves

Cited by 11 publications

References 177 publications

Biosynthesized Metallic Nanoarchitecture for Photocatalytic Degradation of Emerging Organochlorine and Organophosphate Pollutants: A Review

Biosynthesized Metallic Nanoarchitecture for Photocatalytic Degradation of Emerging Organochlorine and Organophosphate Pollutants: A Review

Photocatalytic Degradation of Maxilon Dye Pollutants using Nano‐Architecture Functional Materials: A Review

A review on eco‐sustainable photocatalytic degradation of pharmaceutical pollutants using biosynthesized nanoparticles

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