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Optical microphotographs (500×) and UV–vis spectra of the process of GO from PGO. (a) Optical microphotographs (500×) of PGO in WGOML. (b) Optical microphotographs (500×) of PGO in HGOML. (c) UV–vis spectra of MSAS, WGOML, and HGOML. (d) Filter cake after washing with hydrochloric acid and vacuum extraction.
