green synthesis of zinc

1. BIOMEDIATED SYNTHESIS OF ZINC OXIDE
NANOPARTICLES USING CARICA PAPAYA AND ITS
CHARACTERIZATION
submitted by,
Christy Mary Joy

2. Application of ZnO NPs
• Rubber Industry.
• Pharmaceutical and cosmetic industry.
• Photo catalysis.
• Miscellaneous applications.
• Electronics and electro technology industries.
• Textile industry.

3. OBJECTIVES OF STUDY
1. To characterize synthesized ZnO NPs using ultraviolet-visible
(u-V) spectroscopy, X- ray Diffraction (XRD).
2. To synthesize ZnO NPs through a green synthesis pathway
using Carica papaya (papaya Leaf).

4. Methodology
Preparation of standard solution of zinc acetate:
Preparation of standard solution of Ammonium Carbonate:

5. PROCEDURE
• 100 ml of leaf extract was taken in a 500 ml clean beaker mounted on a magnetic
stirrer. 100 ml of 0.1 M ammonium carbonate solution and zinc acetate solutions
were simultaneously added to it from a burette drop by drop at the rate of one drop
in 2 seconds.
• During the addition, the solution was stirred vigorously about 2-3 hours till a
greenish precipitate was formed. The inert medium provided by papaya leaf extract
isolates the particles formed from aggregation.
• The precipitate is filtered off using funnel and filter paper and washed with distilled
water several times. It was then dried and transferred into a crucible and heated for
two hours at 400 ˚C in a muffle furnace . The sample was then transferred into a
mortar and grinded well .

6. • X-ray diffraction (XRD)
crystalline size of synthesized Zinc oxide particle using Scherer's
equation
D= 𝐾 λ /𝛽 𝑐𝑜𝑠Ө
where, β =𝐹𝑊𝐻𝑀ax 2*𝜋/180°
• UV-Visible spectroscopy
Band gap energy
Ebg = hc / λ
CHARACTERIZATION TECHNIQUES

7. RESULTS AND DISCUSION
 Characterization of Synthesized Zinc Oxide Nanoparticles
• In this work Zinc oxide nanoparticles are synthesized through biogenic green
method using Zinc acetate and ammonium carbonate as precursor and
papaya leaf as capping agent.
• The synthesized ZnO NPs was characterized accordingly using XRD, UV-V
Spectroscopy.

8. X-ray Diffraction (XRD)
XRD of synthesized ZnO nanoparticles

9. UV Visible Analysis
UV-Visible spectrum of synthesized ZnO NPs

10. CONCLUSION:
 The crystalline size of synthesized ZnO NP = 19.22 nm
 The energy band gap of as synthesized nanoparticles was
obtained to be equal to 3.3406 eV.