Environmental Science and Pollution Research

, Volume 26, Issue 5, pp 5140–5154 | Cite as

Manganese dioxide nanoparticles/activated carbon composite as efficient UV and visible-light photocatalyst

  • Idrees Khan
  • Muhammad Sadiq
  • Ibrahim Khan
  • Khalid SaeedEmail author
Research Article


Manganese dioxide nanoparticles/activated carbon (MnO2/AC) composites and manganese dioxide nanoparticles (MnO2 NPs) are prepared through chemical reduction method. Morphological study shows that MnO2 NPs had cylindrical and spherical shape. The morphological study also revealed that MnO2 NPs were well dispersed on AC while neat Mn NPs present both in dispersed and in agglomerated form. The FT-IR study confirms the synthesis of MnO2 NPs. Zetasizer study presented that the Mn NPs had uniform size and below 100 nm in size and had zeta potential of − 20 mV, which represent its stability in the suspension form. The synthesized Mn/AC composite and Mn NPs were utilized as photocatalysts for the photodegradation of Congo red (CR) dye. The degradation study shows that MnO2/AC composite degraded CR dye more efficiently than MnO2 NPs under UV and normal light irradiation. The efficient degradation of dye by Mn/AC composite is due to the synergistic effect between dye adsorption on AC and rapid photodegradation by supported MnO2 NPs. The results revealed that Mn/AC composite degraded about 98.53% of CR dye within 5 min while MnO2 NPs degraded 66.57% of dye within the same irradiation time. The recycled catalyst also significantly degraded dye which verifies its sustainability. The effect of catalyst dosage and initial dye concentration was conducted. The degradation rate of dye was found drastically faster in tap water (in presence of catalyst), which might be due to the presence of various mineral ions in the tap water.


Manganese dioxide, nanoparticles Activated carbon Photodegradation Congo red Photocatalyst 


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Idrees Khan
    • 1
  • Muhammad Sadiq
    • 2
  • Ibrahim Khan
    • 3
  • Khalid Saeed
    • 1
    Email author
  1. 1.Department of ChemistryBacha Khan UniversityCharsaddaPakistan
  2. 2.Department of ChemistryUniversity of MalakandChakdara, Dir (L)Pakistan
  3. 3.Department of ChemistryKing Fahd University of Petroleum and MineralsDhahranSaudi Arabia

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