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Caption : fig. s1 the photos of zno powder synthesized by the serum-based precipitation method using (a) zinc acetate and (b) zinc nitrate as zinc precursors with various amounts of skim latex serum.

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Caption : fig. s2 kinetic study of photocatalytic degradation of methylene blue using (a) commercial zno (c-zno) and (b) a-zno-serum 1.