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Open research questions in Advanced Photocatalysis Techniques

711 gap statements mined from Advanced Photocatalysis Techniques papers in our 7.9M-paper local library, which holds 15,101 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • The gap is the need for a efficient and effective method for photocatalytic degradation of ciprofloxacin. Traditional treatment methods are not effective in degrading persistent pollutants. There is a lack of understanding of the mechanism of photocatalytic degradation.

    Sol-gel auto combustion synthesis of Z-scheme CuFe2O4/GCN/rGO ternary photocatalyst for efficient photocatalytic degradation of ciprofloxacin · 2026 · DOI

  • The limited ability of ZnO to absorb solar light. The need for more efficient and sustainable technologies for environmental remediation and energy conversion. The lack of understanding of the effect of the combination of ZnO and Ag nanoparticles on charge-carrier generation and light absorption.

    Synthesis of plasmonic Ag-ZnO-TiO2 nanocomposites for enhanced visible-light photocatalytic activity · 2026 · DOI

  • The need to consider the effect of initial concentration and pH on the degradation process. The importance of achieving rapid charge transport properties and high-density photocurrent production.

    Construction of Co3O4/g-C3N4 S-scheme heterojunction with modulated charge transport and extended visible-light harvesting for photocatalytic mineralization of organic pollutants · 2026 · DOI

  • The lack of a method that can efficiently produce H2O2 without breaking O-O bonds. The need for a novel material with enhanced separation and migration efficiency of photogenerated charge carriers. The requirement for a dual-channel pathway for H2O2 production.

    Half-unit-cell-thick ZnIn2S4 nanosheets with sulfur vacancies for sacrificial-agent-free photocatalytic H2O2 production via dual-channel pathway · 2026 · DOI

  • The microscopic electronic mechanisms by which cocatalysts interact with III-nitride surfaces are not well understood. Global electronic descriptors obscure the spatially localized interfacial physics governing charge separation and charge utilization.

    Region-resolved interface descriptors in III-nitride–nanocluster photocatalysts · 2026 · DOI

  • Intrinsic drawbacks of graphitic carbon nitride limit its photocatalytic performance. Lack of effective methods to improve its performance. Need for new approaches to synthesize and characterize graphitic carbon nitride with enhanced properties.

    Urea-Derived Carbon Nitride Fragmentation: A Route to Melem-Based Superstructures · 2026 · DOI

  • The paper highlights the need to understand the phase and elemental composition, structure, morphology, and textural characteristics of the obtained composites. The paper identifies the challenge of optimizing the synthesis conditions to obtain composites with high catalytic efficiency.

    Composite Catalysts Based on Manganese Carbonate Ore for Environmental Ozone Decomposition and Decolourization of Malachite Green Dye · 2025 · DOI

  • There is a gap in the development of efficient catalysts for ozone decomposition and dye decolourization. The paper identifies the need for novel composite catalysts that can efficiently decompose ozone and decolourize Malachite Green dye.

    Composite Catalysts Based on Manganese Carbonate Ore for Environmental Ozone Decomposition and Decolourization of Malachite Green Dye · 2025 · DOI

  • The need for efficient degradation methods for pharmaceutical contaminants, such as acetaminophen. The limited effectiveness of current photocatalysts for the degradation of acetaminophen. The lack of understanding of the photocatalytic mechanisms involved in the degradation of acetaminophen.

    Photocatalytic Degradation of Acetaminophen by g-C3N4/CQD/Ag Nanocomposites from Aqueous Media · 2025 · DOI

  • The need for sustainable routes for mitigating carbon emissions. The challenge of developing efficient photocatalysts for CO2 reduction. The gap in understanding the charge separation and interfacial transfer mechanisms in heterostructured composites.

    Photocatalytic CO2 Conversion Using MoSe2/g-C3N4 Heterostructured Composites with Enhanced Selectivity and Activity · 2025 · DOI

  • The need for innovative and profitable techniques for hydrogen evolution. The lack of stability of photocatalysts. The need for a transition to renewable and sustainable energy sources to curb greenhouse gas emissions.

    Effective CdS:(Ce, Ga) Nanoparticles for Photocatalytic H2 Production Under Artificial Solar Light Exposer · 2025 · DOI

  • The gap in the literature is the lack of understanding of the role of nanoparticle composition and positioning in optimizing photocatalytic efficiency. The study identifies the need for a systematic investigation of the photocatalytic activity of Zn-Ferrite and Hematite dispersed by SBA-15 Silica Grains.

    Zn-Ferrite and Hematite Dispersed by SBA-15 Silica Grains: Visible Light-Driven Photocatalytic Activity for Advanced Oxidation Process on Amoxicillin · 2025 · DOI

  • The lack of optimization of photocatalytic process parameters using artificial intelligence. The need for techno-economic feasibility in the treatment of methylene blue dye-containing wastewater. The requirement for sustainable development goals accompanied by pollution reduction, human health protection, and aquatic species conservation.

    Synergism of Artificial Intelligence and Techno-Economic for Sustainable Treatment of Methylene Blue Dye-Containing Wastewater by Photocatalysis · 2024 · DOI

  • The need to carefully adjust the conversion process to produce BiOI nanoflakes with high yield and purity. The challenge of scaling up the production of BiOI nanoflakes while maintaining their superior characteristics. The need to optimize the photocatalytic activity of the produced BiOI nanoflakes for environmental remediation applications.

    Ultrasonic-Assisted Conversion of Micrometer-Sized BiI3 into BiOI Nanoflakes for Photocatalytic Applications · 2024 · DOI

  • The limited production of BioH2 in photofermentation. The high values of COD and VS in the digestate after photofermentation.

    Assessment of the Sequential Dark Fermentation and Photofermentation of Organic Solid Waste with Magnetite and Substrate Pre-Treatment Aimed at Hydrogen Use · 2025 · DOI

  • Investigate long-term stability and reusability, - Explore applications in real-world wastewater treatment, - Study effects of different catalyst dosages and pH…

    Phytochemical-mediated design of magnetic MgFe2S4/CoBiO2I heterojunction for enhanced photocatalytic degradation of ciprofloxacin · 2026 · DOI

  • Investigating the effect of other operating parameters, such as pH and temperature, on the photocatalytic degradation efficiency. Studying the reusability and stability of the CuFe 2 O 4 /GCN/rGO ternary composite catalyst. Exploring the application of the CuFe 2 O 4 /GCN/rGO ternary composite catalyst for the degradation of other pollutants.

    Sol-gel auto combustion synthesis of Z-scheme CuFe2O4/GCN/rGO ternary photocatalyst for efficient photocatalytic degradation of ciprofloxacin · 2026 · DOI

  • Investigation of the catalytic performance of the composite photocatalysts in the photocatalytic epoxidation of styrene, - Optimization of the experimental conditions to conduct an in-depth investigation of the catalytic performance, - Development of cost-effective, efficient, sustainable, and stable…

    Visible‐light excitable TiO2/Na-P-g-C3N4 heterojunction catalysts for photocatalytic epoxidation of styrene · 2026 · DOI

  • Investigating the effects of other variables on the photocatalytic activity, - Exploring the economic viability of the Co_3O_4/g-C_3N_4 heterojunction, - Studying the scalability of the Co_3O_4/g-C_3N_4 heterojunction for industrial…

    Construction of Co3O4/g-C3N4 S-scheme heterojunction with modulated charge transport and extended visible-light harvesting for photocatalytic mineralization of organic pollutants · 2026 · DOI

  • Investigating the effects of different nanocluster cocatalysts on III-nitride surfaces, - Exploring the application of region-resolved interface descriptors to other photocatalytic…

    Region-resolved interface descriptors in III-nitride–nanocluster photocatalysts · 2026 · DOI

  • Conventional water treatment technologies offer limited removal capability toward recalcitrant and highly toxic pollutants, - Excess secondary phases can lead to particle agglomeration or bury active sites, - Incomplete mineralization, secondary pollution risks, and poor adaptability toward complex…

    Graphitic Carbon Nitride-Based Heterojunctions for Photocatalytic Water Purification: Mechanisms, Fabrication, and Applications · 2026 · DOI

  • Rational design of high-performance g-C3N4-based heterojunctions, - Practical engineering prospects of g-C3N4-based heterojunctions, - Translation of g-C3N4-based heterojunctions toward practical water…

    Graphitic Carbon Nitride-Based Heterojunctions for Photocatalytic Water Purification: Mechanisms, Fabrication, and Applications · 2026 · DOI

  • The natural scarcity of H2 gas - The requirement for low-cost manufacturing techniques - Currently, around 5% of commercial hydrogen is produced from renewable sources, while the remaining portion is still produced from fossil…

    Enhanced Photocatalytic Hydrogen Generation from Methanol Solutions via In Situ Ni/Pt Co-Deposition on TiO2 · 2025 · DOI

  • Investigating other metal ions for in situ deposition on TiO2 - Exploring the effect of different Pt loading amounts on the photocatalytic activity - Studying the long-term stability of the NiPt/TiO2…

    Enhanced Photocatalytic Hydrogen Generation from Methanol Solutions via In Situ Ni/Pt Co-Deposition on TiO2 · 2025 · DOI

  • The study focuses solely on hydrogen production through dark fermentation due to limited production of BioH2 in photofermentation, - The magnetite may have been inhibitory in the photofermentation process, - The experiment was conducted with a specific type of organic waste…

    Assessment of the Sequential Dark Fermentation and Photofermentation of Organic Solid Waste with Magnetite and Substrate Pre-Treatment Aimed at Hydrogen Use · 2025 · DOI

Most-cited papers in Advanced Photocatalysis Techniques

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Open questions raised by papers listed on this page include: (1) There is a lack of understanding of the mechanism of photocatalytic degradation (“Sol-gel auto combustion synthesis of Z-scheme CuFe2O4/GCN/rGO ternary…”, 2026); (2) The lack of understanding of the effect of the combination of ZnO and Ag nanoparticles on charge-carrier generation and light absorption (“Synthesis of plasmonic Ag-ZnO-TiO2 nanocomposites for enhanced visible-light…”, 2026); (3) The lack of a method that can efficiently produce H2O2 without breaking O-O bonds (“Half-unit-cell-thick ZnIn2S4 nanosheets with sulfur vacancies for…”, 2026); (4) The microscopic electronic mechanisms by which cocatalysts interact with III-nitride surfaces are not well understood (“Region-resolved interface descriptors in III-nitride–nanocluster photocatalysts”, 2026); (5) The lack of understanding of the photocatalytic mechanisms involved in the degradation of acetaminophen (“Photocatalytic Degradation of Acetaminophen by g-C3N4/CQD/Ag Nanocomposites…”, 2025). 711 gap statements have been mined from Advanced Photocatalysis Techniques papers in our 7.9M-paper local library, which holds 15,101 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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