Endang Widjayanti LFX
FMIPA UNY

Published : 2 Documents
Articles

Found 2 Documents
Search

NANOPARTIKEL APPLICATION OF TIN WHITE PRODUCTS AS A MICROSENSOR ETHANOL Utomo, M. Pranjoto; LFX, Endang Widjayanti; Prodjosantoso, Anti Kolonial; Wulandari, Rini
Jurnal Penelitian Saintek Vol 18, No 1: April 2013
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v18i1.1831

Abstract

Penelitian  ini bertujuan  untuk mengetahui  karakter  SnOz, kemampuan  adsorpsi  dan kepekaan  mikrosensor  timah oksida terhadap  etanol. Timah  oksida (SnOz) disintesis melalui  metode  sol-gel.  Terbentuknya  Sn02  dipelajari  dengan  cara membandingkan difraktrogram  Sn02 hasil sintesis dengan difraktogram  standar JCPDS. Adsorpsi etanol pada permukaan  SnOz dipelajari  berdasar  spektra FTIR sebelum dan sesudah proses adsorpsi. Daya adsorpsi Sn02 terhadap etanol pada berbagai waktu pemaparan ditentukan dengan  menggunakan  metode  Micro Conway Diffusion. Konduktivitas  listrik  Sn02 sebelum dan sesudah adsorpsi pada berbagai waktu pemaparan  ditentukan berdasarkan resistansi Sn02. Hasil penelitian menunjukkan bahwa  Sn02  berhasil  disintesis berdasarkan kemiripan  puncak  pada difraktogram  hasil sintesis  dengan puncak  pada  difraktogram standar, yaitu pada 29: 26,48; 33,87; 51,72. Adsorbsi Sn02 terhadap etanol ditunjukkan dengan adanya serapan baru pada 1300-1000 em" (serapan khas gugus -CO). Daya adsorpsi per gram Sn02 pada waktu pemaparan 3, 10, dan 30 menit masing-masing adalah 0,0222 g, 0,0224 g, dan 0,0226 g. Konduktivitas  listrik Sn02 sebelum proses adsorpsi adalah 2,042x10-5 S/cm. Konduktivitas  SnOz sesudah proses adsorpsi terhadap etanol cair pada waktu pemaparan  3, 5, 10, 20, dan 30 menit secara berurutan  adalah 94,783x10-5 , 82,935x10-5 , 66,348x10-5 , 64,730x10-5 dan  63,189x10-5 S/cm. Konduktivitas SnOz terhadap gas etanol pada waktu pemaparan 3, 5 dan 10 menit secara berurutan adalah 0,332xlO-5, 0,295x10-5 dan 0,265x10-5 S/cm.
EFFECT OF MORDAN SYNTHESIS OF CANNED WASTE TO POWER IKAT DAN LAJU REMOVED METHYL VIOLET COLOR DYES BY FABRIC FIBER EFFECT OF MORDAN SYNTHESIS OF CANNED WASTE TO POWER Ikhsan, Jaslin; LFX, Endang Widjayanti; Sunarto, Sunarto
Jurnal Penelitian Saintek Vol 19, No 1: April 2014
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v19i1.2330

Abstract

This study aims to determine: the binding capacity of cloth toward methylene violet (MV) dye, the rate of releaseof methyl violet from cloth due to washing, and the effect of the addition of the mordant to the binding capacity and the rate of release. pH, temperature, and equilibrium time were always maintained in all experiments. Data of binding capacity were collected by isothem experiments and performed by measuring the concentration of methyl violet bound by cloth at various added-concentrations of methylene violet. Collected  data were analyzed with a Langmuir and Freundlich isotherm equations. Data of release rate were collected by mesuring the concentration of free methylene violet dye in solution due to washing as a function of time. The release data were analyzed using the Lagergren rate equation. The analysis showed that bonding between methylene violet and cloth occurs with releasing protons and via hydrogen bonds. Binding capacity was represented by the Freundlich isotherm equation on which the capacity was decreased by the addition of mordant, with represented bythe constants of k 1 , 2.45 x 10 -8  and 1.75 x 10-8  M MV per gram of cloth, respectively. The addition of mordant also deceleratedoubly the releaseof MV from cloth due to washing whose constants k - 2 were 2103.039 and 1013.958 mmol g-1 min-1, respectively.