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Fig.7 Effect of modification on chemical composition of powders (a) XPS spectra of the powders before and after modification; (b) XPS spectra of O 1s in the unmodified sepiolite; (c) XPS spectra of O 1s in the powders after 3 h modification; (d) XPS spectra of Si 2p in the unmodified sepiolite; (e) XPS spectra of Si 2p in the powders after 3 h modification