PENURUNAN WARNA METHYLENE BLUEDALAM AIRRNMENGGUNAKAN FOTOKATALISRNLA-DOPED NATAO3

PENURUNAN WARNA METHYLENE BLUEDALAM AIRRNMENGGUNAKAN FOTOKATALISRNLA-DOPED NATAO3

ABSTRAKFotokatalis La-doped NaTaO3.Telah disintesis dengan mengunakan mitode sol dan gel pada temperatur 800oC. Penelitian ini bertujuan mendegradasi limbah zat warna (Methlyene blue) dalam air dengan mengunakan Mitode fotokatalisis,katalis dikarateristik dengan mengunakan X-Ray Defractofometer (XRD), dan Scaning Electron Microscopy (SEM).Hasil dari pada analisa (SEM) terlihat struktur dan bentuk dari partikel, dan hasil dari spectrum (XRD) menunjukan derajat kristalisasi yang tinggi.Persentase degradasi Methlyene blue semakin meningkat dengan bertambahnya nilai pH. Analisa sampel larutan Methlyene blue dilakukan dengan Spectrofotometer untuk mengetahui penurunan Methyleneblue secara fotokatalisis.Persen degradasi terbesar terlihat pada pH 9, mencapai angka 87 %. Semakin lama waktu radiasi maka persen degradasi Methlyene blue semakin meningkat. Hal ini disebabkan radikal hidroksil yang dihasilkan semakin banyak. Demikian juga Penambahan H2O2 dan NaOH dalam larutan Methlyene blue menghasilkan peningkatan degradasi yang signifikan mencapai 88%.Kata kunci : Methylen blue, La-doped NaTaO3, Fotokatalisis.ixABSTRACTPhoto catalyst La-dope NaTaO3, has been synthetized using sol method and gel on the temperature of 800oC. The purpose of this study is to break down the dye effluent (methylene blue) in the water by using photo catalyst method, where catalyst is characterized by using X-ray Defractofometer (XRD), and scanning Electron Microscopy (SEM). The results were taken from the analyzed data by using SEM shown that the structure and the form of the particles, and the XRD results were also in the high crystallization. The percentage of methylene blue degradation was getting higher as the increasing of pH Value. The analyzed sample of Methylene blue was executed by using spectrophotometer in order to know the reduction of Methylene blue analytically. The biggest analysis percentage on the pH of 9, was getting 87 in percentage. The Longer radiation time used the higher Methylene blue obtained. It was because of the radical hydroxyl was obtained higher, and also the addition of H2O2 and NaOH in Methylene Blue resulted the increment of significant degradation until 88%.Key words: Methylene Blue, La doped NaTaO3, photo catalyst.

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