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Open research questions in Advanced oxidation water treatment

350 gap statements mined from Advanced oxidation water treatment papers in our 7.9M-paper local library, which holds 3,967 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 lack of understanding of the electrochemical oxidation of p-phenylenediamine in aqueous media. The need for a facile and efficient method for synthesizing novel compounds from p-phenylenediamine. The limited knowledge of the pH-dependent mechanism of the electrochemical oxidation of p-phenylenediamine.

    Electrochemical oxidation of p-phenylenediamine in aqueous media: a pH-dependent study and synthesis of a new trimer of p-phenylenediamine · 2026 · DOI

  • Limited biodegradability of sulfonamide antibiotics in aquatic environments. Inefficacy of conventional wastewater treatment in removing sulfamethazine. Need for advanced oxidation processes, particularly PMS-based systems, for efficient mineralization and compliance with discharge standards.

    Copper-Based MOF-Derived Core–Shell Materials via N/P/S Ternary Doping for Peroxymonosulfate Activation: Efficient Degradation and Removal of Sulfamethazine · 2025 · DOI

  • Conventional treatment technologies are inefficient in removing contaminants of emerging concern from wastewater. There is a lack of sustainable and efficient strategies for removing these contaminants. The need for advanced remediation strategies to address the issue of contaminants of emerging concern in wastewater.

    Hook-and-Destroy Strategy for Efficient Activation of Persulfate by B-Doped Pyrochar for the Removal of Contaminants of Emerging Concern from Wastewater · 2025 · DOI

  • The lack of effective co-catalyst application strategies and suitable reactor designs hinders the practical implementation of co-catalytic Fenton reactions. The consumption of active sites on co-catalysts by H2O2 undermines the efficiency and stability of co-catalytic Fenton reactions.

    Enhanced Degradation of 4-Nitrophenol via a Two-Stage Co-Catalytic Fenton Packed-Bed Reactor with External Circulation · 2025 · DOI

  • The need to optimize the conditions for electrooxidation and photoelectrooxidation to reduce ecotoxicity. The complexity of predicting ecotoxicity thresholds for combinations of bentazone, NaCl, and Na2SO4.

    Ecotoxicity Analysis of Bentazone Under the Albufera Lake Conditions Before and After Electrooxidation and Photoelectrooxidation Processes · 2025 · DOI

  • The lack of understanding of the ecotoxicity of bentazone in the presence of NaCl and Na2SO4. The need for effective methods to reduce the ecotoxicity of bentazone in wastewater.

    Ecotoxicity Analysis of Bentazone Under the Albufera Lake Conditions Before and After Electrooxidation and Photoelectrooxidation Processes · 2025 · DOI

  • The study identifies the need for cost-effective, durable, and high-performance electrode materials. The study highlights the importance of overcoming current limitations, such as high operational costs and electrode degradation.

    Electrochemical Methods for Nutrient Removal in Wastewater: A Review of Advanced Electrode Materials, Processes, and Applications · 2024 · DOI

  • The high cost and energy requirements of advanced oxidation processes are significant challenges. The lack of efficient regeneration techniques for biochar is a challenge that needs to be addressed. The variability in the physicochemical characteristics of biochar can affect its performance as a catalyst in AOPs.

    Combination of Biochar and Advanced Oxidation Processes for the Sustainable Elimination of Pharmaceuticals in Water · 2024 · DOI

  • Although non-thermal plasma can promote efficient CBZ degradation, the elementary molecular mechanisms governing its initial oxidative transformation remain incompletely understood.

    Atomic oxygen-induced oxidative degradation of carbamazepine: mechanistic insights from reactive molecular dynamics · 2026 · DOI

  • Solar-driven activation of peroxymonosulfate (PMS) is a promising advanced oxidation process for water and wastewater treatment; however, the kinetics of emerging contaminant removal in real water matrices remain poorly understood.

    Solar Activation of Peroxymonosulfate by Chromophoric Dissolved Organic Matter Enables Predictable Micropollutant Attenuation in Real Waters · 2026 · DOI

  • The need for sustainable and low-energy treatment methods for petroleum refinery wastewater. The lack of effective treatment methods for complex petroleum-derived pollutants.

    Treatment of petroleum refinery wastewater by photo-anodic oxidation process with Gr /Bi-Ni-Sb-SnO2 rotating photo-anode: Performance and kinetic study · 2026 · DOI

  • Long-term electrode stability, operational costs, and energy consumption were not comprehensively evaluated, which may affect the economic feasibility of full-scale implementation. Therefore, future studies should focus on pilot-scale validation, long-term performance assessment, and techno-economic analysis to better understand the process viability.

    Optimization of the electrochemical Fenton process for hexavalent chromium removal from tannery wastewater · 2026 · DOI

  • The lack of efficient, sustainable, and cost-effective strategies for TCH removal. The need for the development of advanced oxidation processes that can degrade recalcitrant organic contaminants under relatively mild operating conditions.

    Oxygen vacancy rich lanthanum doped nickel ferrite as a visible light driven peroxydisulfate activator for rapid degradation of tetracycline in water · 2026 · DOI

  • In this mini review, we have discussed the synergistic catalytic elimination of NOx and VOCs, critically analyzing how engineered acid-redox bifunctionality and dynamic active site cooperation can overcome inherent challenges such as temperature-window mismatch and competitive adsorption in complex flue gases.

    Synergistic catalytic strategies for multipollutant control · 2026 · DOI

  • There is a need for more efficient and robust anodes for industrial wastewater treatment. Conventional anodes have limitations in terms of stability and catalytic efficiency.

    Artificial neural network model-based investigation of Ti/PANI/PbO2 electrode performance in methylene blue wastewater electrooxidation · 2026 · DOI

  • The treatment of P&P wastewater is challenging due to its high chemical oxygen demand and toxicity. The paper highlights the need for more effective and sustainable treatment technologies. The treatment of refractory organics in P&P wastewater is a significant challenge.

    Recent Advances in Electrocatalytic Treatment and Valorization of Pulping and Papermaking Wastewater · 2026 · DOI

  • Conventional treatment methods have insufficient degradation efficiency toward recalcitrant organics. There is a need for more effective and sustainable treatment technologies for P&P wastewater. The paper identifies the potential of electrocatalytic technologies to address this gap.

    Recent Advances in Electrocatalytic Treatment and Valorization of Pulping and Papermaking Wastewater · 2026 · DOI

  • Further research is needed to investigate the scalability and cost-effectiveness of the combined chemical precipitation and Fenton processes. The use of other oxidation processes, such as ozone or UV treatment, could be investigated as alternative approaches for enhancing leachate biodegradability.

    Feasibility study on enhancing the biodegradability of fresh and old landfill leachate using combined chemical precipitation and Fenton processes · 2026 · DOI

  • Future studies should focus on (i) continuous flow pilot trials, (ii) characterization and dewatering of Fe rich sludge; (iii) reusability of the sludge as a coagulant or Fenton catalyst; and (iv) multivariate optimization using RSM to capture interaction effects.

    Mechanistic Optimization of FeSO4 for Synthetic Petroleum Wastewater Treatment · 2026 · DOI

  • The need to consider wastewater complexity, reactor-scale performance, and operational durability in evaluating catalytic ozonation strategies.

    Non-Radical Catalytic Ozonation for Wastewater Treatment: Evidence Standards, Bromate Trade-Offs, and Scale-Up Constraints · 2026 · DOI

  • Utilising AOPs to create ZNPs has great potential for treating wastewater. By using naturally occurring, non-toxic, and recyclable zeolites, this technique incorporates green chemistry concepts and supports sustainability objectives. Nanotechnology developments will enable ZNPs to have customised characteristics, increasing their effectiveness in removing a variety of contaminants.

    A review of zeolite nanoparticles in wastewater treatment for sustainable water management in the advanced oxidation process application · 2026 · DOI

  • The ultrasound-assisted Fe2O3 process is energy-intensive, - The study was conducted at a laboratory scale, - The process requires further energy optimization before practical…

    Investigating the Combined Effect of Ultrasound and an Iron Oxide Catalyst for the Degradation of Congo Red Dye · 2026 · DOI

  • Investigation of the long-term environmental risks associated with residual tungsten, - Optimization of the ECTPBR system for large-scale applications, - Comparison with other wastewater treatment…

    Enhanced Degradation of 4-Nitrophenol via a Two-Stage Co-Catalytic Fenton Packed-Bed Reactor with External Circulation · 2025 · DOI

  • Further research must be conducted to evaluate different regeneration techniques to increase biochar’s sustainable applicability, - Research on the modification of biochar to enhance its catalytic performance, such as iron (Fe) impregnation, heteroatom doping, and supporting semiconductors on the biochar…

    Combination of Biochar and Advanced Oxidation Processes for the Sustainable Elimination of Pharmaceuticals in Water · 2024 · DOI

  • Scaling up the photoelectrocatalysis process for industrial applications. Investigating the use of other photo-anodes and irradiation sources. Evaluating the effectiveness of photoelectrocatalysis for treating other types of wastewater.

    Treatment of petroleum refinery wastewater by photo-anodic oxidation process with Gr /Bi-Ni-Sb-SnO2 rotating photo-anode: Performance and kinetic study · 2026 · DOI

Most-cited papers in Advanced oxidation water treatment

Most recent work

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Open questions raised by papers listed on this page include: (1) The lack of understanding of the electrochemical oxidation of p-phenylenediamine in aqueous media (“Electrochemical oxidation of p-phenylenediamine in aqueous media: a…”, 2026); (2) Although non-thermal plasma can promote efficient CBZ degradation, the elementary molecular mechanisms governing its initial oxidative transformation remain incompletely understood (“Atomic oxygen-induced oxidative degradation of carbamazepine: mechanistic…”, 2026); (3) Solar-driven activation of peroxymonosulfate (PMS) is a promising advanced oxidation process for water and wastewater treatment; however, the kinetics of emerging contaminant removal in real water matrices remain poorly understood (“Solar Activation of Peroxymonosulfate by Chromophoric Dissolved Organic Matter…”, 2026); (4) The lack of effective treatment methods for complex petroleum-derived pollutants (“Treatment of petroleum refinery wastewater by photo-anodic oxidation process…”, 2026); (5) Future studies should focus on pilot-scale validation, long-term performance assessment, and techno-economic analysis to better understand the process viability (“Optimization of the electrochemical Fenton process for hexavalent chromium…”, 2026). 350 gap statements have been mined from Advanced oxidation water treatment papers in our 7.9M-paper local library, which holds 3,967 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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