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(a) STEM image of gig-lox TiO2 spongy layer after Pb sequestration. The distribution of Pb is uniform both in the meso and nano porosity of the gig-lox sponge. (b) Representation of one of the possible configurations of Pb bond with TiO2, wherein Pb is substitutional to Ti. In the figure: oxygen is pink; titanium is grey; lead is yellow.
