Electronic Theses and Dissertation

ABSTRAK
Fotokatalis La-doped NaTaO
3
.Telah disintesis dengan mengunakan mitode sol dan
gel pada temperatur 800
o
C. 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 NaTaO
3,
Fotokatalisis.
ix
ABSTRACT
Photo 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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