Retraction notices

Modified of CaO-Nanoparticle Synthesized from Waste Oyster Shells with Tin Tailings as a Renewable Catalyst for Biodiesel Production from Waste Cooking Oil as a Feedstock

Type

Retraction

Notice date

11/20/2025 0:00

Journal

Chemistry Africa

Publisher

Springer - Nature Publishing Group

Notice DOI

10.1007/s42250-025-01500-z

Original paper DOI

10.1007/s42250-022-00541-y

Reasons

• Concerns/Issues about Image
• Duplication of/in Image
• Euphemisms for Duplication
• Investigation by Journal/Publisher
• Investigation by Third Party
• Unreliable Data
• Unreliable Results and/or Conclusions

Matching venue names

Name match only, not an authoritative journal identifier.

• Chemistry Africa