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. 2020 Sep 23;13(19):4241. doi: 10.3390/ma13194241

Figure 2.

Figure 2

Absorption spectrum of ZnO nanoparticles produced from (a) Grape, (b) Lemon and (c) Orange peel extract within 10 min, within 10 min of introducing NaOH, 1 h, 2 h, 3 h and 4 h.