Mn[sup.2+] Doped Cobalt Oxide and Its Composite with Carbon Nanotubes for Adsorption-Assisted Photocatalytic Applications

• Published in: Sustainability 2022-12, Vol.14 (24)
• Main Authors: Fida, Muhammad, Iqbal, Shahid, Shah, Mazloom, Fazal, Tanzeela, Ismail, Bushra, Rehman, Hafiz ur, Al-Fawzan, Foziah F, Elkaeed, Eslam B, Pashameah, Rami Adel, Alzahrani, Eman, Farouk, Abd-ElAziem
• Format: Article
• Language: English
• Subjects: Adsorption; Chemical research; Nanotechnology; Nanotubes; Photocatalysis; Purification; Sewage; Spectrum analysis
• ISSN: 2071-1050; 2071-1050
• DOI: 10.3390/su142416932

In this study, cobalt oxide (Co[sub.3] O[sub.4] ), Mn-doped Co[sub.3] O[sub.4] (MDCO), and Mn-doped Co[sub.3] O[sub.4] -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.