The need for critical studies and reviews

The gap

Evidence profile

Sourced from the stated research gap and future-work section and limitations section and stated challenges of the source papers, classified as general, drawn from work published between 2024 and 2026, spanning 4 journals. Those papers have been cited 718 times in total.

Supporting evidence — 8 representative gaps

• A Bio-Mimetic Approach: Non-adverse Effects of Zinc Oxide Nanoparticles with Probiotic Isolate (Lactiplantibacillus plantarum) (2026) · The Open Biotechnology Journal · doi

  The lack of environmentally friendly methods for the synthesis of ZnO nanoparticles. The need for novel approaches for the biosynthesis of ZnO nanoparticles. The limited understanding of the antibacterial and cytotoxic activities of ZnO nanoparticles.

  generalstated research gapevidence 5/5
  Keywords: lack environmentally friendly methods synthesis zno nanoparticles need
• Investigation of photocatalytic properties of Cu & Rb Co-doped ZnO thin films via sol-gel spin coating method (2026) · Journal of Sol-Gel Science and Technology · doi

  Future studies can investigate the long-term stability of the Cu/Rb: ZnO thin films. Future studies can examine the photocatalytic activity of the Cu/Rb: ZnO thin films in different light sources. Future studies can explore the use of Cu/Rb: ZnO thin films in combination with other technologies to enhance their photocatalytic activity.

  generalfuture-work sectionevidence 5/5
  Keywords: future studies investigate long-term stability zno thin films
• Photocatalytic systems: reactions, mechanism, and applications (2024) · RSC Advances · cited 359× · doi

  The need for critical studies and reviews on photocatalysts and photocatalytic processes. The necessity to put the goals of researchers on studies to overcome the limitations of the application and efficiency of photocatalysts.

  generalstated research gapevidence 5/5
  Keywords: need critical studies reviews photocatalysts photocatalytic processes necessity
• Photocatalytic systems: reactions, mechanism, and applications (2024) · RSC Advances · cited 359× · doi

  To overcome the limitations of the application and efficiency of photocatalysts. To promote the use of photocatalysts on a large scale for the development of industrial activities. To explore the potential applications of photocatalysts in various fields.

  generalfuture-work sectionevidence 5/5
  Keywords: overcome limitations application efficiency photocatalysts promote use large
• Enhancement of ZnO photocatalytic activity through Li and Mg doping: synthesis, characterization, and performance analysis (2026) · Nanotechnology for Environmental Engineering · doi

  There is a need for a comprehensive study on the effect of Li and Mg doping on the photocatalytic activity of ZnO. The current study aims to address this gap by investigating the effect of Li and Mg doping on the photocatalytic activity of ZnO.

  generalstated research gapevidence 5/5
  Keywords: there need comprehensive study effect doping photocatalytic activity
• Enhancement of ZnO photocatalytic activity through Li and Mg doping: synthesis, characterization, and performance analysis (2026) · Nanotechnology for Environmental Engineering · doi

  Future studies can investigate the effect of other dopants on the photocatalytic activity of ZnO. The study of the photocatalytic activity of ZnO under different light sources and conditions can be explored. The development of more efficient and sustainable photocatalysts for environmental applications is a potential area of future research.

  generalfuture-work sectionevidence 5/5
  Keywords: future studies investigate effect other dopants photocatalytic activity
• Enhancement of ZnO photocatalytic activity through Li and Mg doping: synthesis, characterization, and performance analysis (2026) · Nanotechnology for Environmental Engineering · doi

  The content of Li in doped ZnO variants could not be estimated by EDS analysis due to its low ionization energy. The diffusion of Mg into the hydrogel matrix during gelation was limited by synthesis conditions. The study only investigated the photocatalytic activity of the catalysts under visible light irradiation.

  generallimitations sectionevidence 5/5
  Keywords: content doped zno variants estimated eds analysis due
• Enhancement of ZnO photocatalytic activity through Li and Mg doping: synthesis, characterization, and performance analysis (2026) · Nanotechnology for Environmental Engineering · doi

  One challenge is the rapid e-/h+ recombination rate of ZnO, - Another challenge is the limited photocatalytic efficiency of ZnO under solar radiation, - The study also faces the challenge of achieving high stability and recyclability of the catalysts

  generalstated challengesevidence 5/5
  Keywords: one challenge rapid recombination rate zno another limited

Questions about this gap