Presentation on photocatalytic degradation of industrial dyes, pollutants and CO2 reduction

1. Controlled Synthesis of Ag-Sn𝐎𝟐/α- 𝐅𝐞𝟐𝐎𝟑 Nanocomposites
for Improving Visible-Light Catalytic Activities of Pollutant
Degradation and C𝐎𝟐 Reduction
Presented by :
Muhammad Zaka Ansar
133-FoS/PhDPHY/F-23
Presented to:
Dr. Imran Murtaza

2. Purpose of the research
• Environmental pollution is increasing day by day.
• The US Environmental Protection Agency has listed 2,4-DCP as one of
the most toxic pollutants
• It is highly desirable to develop green and efficient techniques to
degrade organic pollutants, such as 2,4-DCP, in water.

3. Research Problem
• Low Efficiency of Traditional Photocatalysts
• Limited Light Absorption
• Stability and Recyclability
• Selective Catalysis
• Scalability and Cost-effectiveness

4. The Strategy
• The hematite α- Fe2O3 is a promising photocatalyst candidate but it
has short recombination time and hence poor charge separation
• One of the most applied strategies is to introduce another
semiconductor to couple with α- Fe2O3, forming a heterojunction
• To increase the catalytic efficiency a co catalyst is also needed to be
attached with the heterojunction

5. Degradation Mechanism

6. The Synthesis Process for FO nanosheets

7. The Synthesis Process for SO nanosheets

8. Synthesis of SO/FO

9. Synthesis of Ag-SO/FO
SO/FO in ethanol
AgNO3 with
different % age
Sonication
Beaker is sealed,
O2 is flushed out

10. XRD and DRS

11. Morphology of Samples by using TEM

12. Analysis of Ag-Sn𝐎𝟐/-𝐅𝐞𝟐𝐎𝟑 Nanocomposites
XPS of NCs
SEM Micrographs of SnO2, Fe2O3 nanosheets and Ag nanorods

13. (a) FS related to produced hydroxyl radicals under
visible-light irradiation
(b) SS-SPS signals for FO, 5SO/FO, and 2Ag-5SO/FO,
respectively
Charge Separation Characteristics Degradation & Reduction
Characteristics
Photocatalytic activities for 2,4-DCP degradation
of FO, 5SO/FO, and 2Ag-5SO/FO respectively,
under visible-light irradiation in the presence of
different scavengers.

14. Degradation of DCP
Photocatalytic aerobic degradation for 2,4-DCP over (a) FO, xSO/FO; (b) yAg-5SO/FO samples under
visible-light irradiation. Note :(x indicates the mass ratio (1, 3, 5, and 7%) of SO relative to FO, and y
indicates the mass ratio (0.5, 1, 2, and 3%) of Ag NPs relative to 5SO/FO respectively.

15. Degradation of BPA and MO and CO2 Reduction
Visible light aerobic degradation of
(a) MO and BPA; (b) and CO2 reduction
Recycle test of 2Ag-5SO/FO for
photocatalytic 2,4-DCP
degradation.

17. 17
Thank you for
your attention
Questions……?