The above reagents are of analytical or chemical purity. Ultra deionized water is produced through the Mil-Q system. <br><br>2.2 Preparation of GT-Fe NPs <br><br>The preparation method of GT-Fe NPs is improved on the basis of Hoag's method (Hoag et al., 2010). Green tea (40 g/L) was heated at 80 °C for 20 min, and vacuum filtered to obtain green tea extract.
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