pto4dLiberty Hill Elementary Parent Teacher Organization (LHE PTO) is a volunteer organization created to support the staff and students of Liberty Hill Elementary.Download scientific diagram | XPS spectra of Pt4f in ( a ) PtO 2 ; ( b ) a Pt foil, and ( c ) Pt loaded on Zn-TPPDON-14. from publication: Dye Modification Effects on TaON for Photocatalytic