Mn2+ Doped Cobalt Oxide and Its Composite with Carbon Nanotubes for Adsorption-Assisted Photocatalytic Applications

Muhammad Fida, Shahid Iqbal, Mazloom Shah, Tanzeela Fazal, Bushra Ismail, Hafiz ur Rehman, Foziah F. Al-Fawzan, Eslam B. Elkaeed, Rami Adel Pashameah, Eman Alzahrani, Abd Elaziem Farouk

Research output: Journal PublicationArticlepeer-review


In this study, cobalt oxide (Co3O4), Mn-doped Co3O4 (MDCO), and Mn-doped Co3O4-functionalized carbon nanotube (MDCO-CNTs) were synthesized via the co-precipitation method using cobalt nitrate and manganese nitrate as a cobalt and manganese precursor, respectively. Synthesized materials were assessed using different characterization techniques like scanning electron microscopy, X-ray diffraction, and UV-visible spectroscopy. Congo red in an aqueous solution was adopted as the model dye to estimate the adsorption-assisted photocatalytic efficiency of the synthesized materials. The samples studied for adsorpsstion-assisted photocatalysis were found to be highly effective and among all the samples, the best removal performance (80%) was obtained by treating the MDCO-CNTs composite for 50 min at 50 °C. Mathematical modeling shows that all of the samples followed a pseudo-second-order kinetic model and data best fitted to a Langmuir isotherm, implying that the process involved in the removal of Congo red dye is chemisorption.

Original languageEnglish
Article number16932
JournalSustainability (Switzerland)
Issue number24
Publication statusPublished - Dec 2022
Externally publishedYes


  • carbon nanotubes
  • cobalt oxide
  • nanocomposite
  • photocatalysis
  • water treatment

ASJC Scopus subject areas

  • Computer Science (miscellaneous)
  • Geography, Planning and Development
  • Renewable Energy, Sustainability and the Environment
  • Environmental Science (miscellaneous)
  • Energy Engineering and Power Technology
  • Hardware and Architecture
  • Computer Networks and Communications
  • Management, Monitoring, Policy and Law


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