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Journal : Jurnal Penelitian Saintek

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 | Full PDF (1379.186 KB) | 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.   
THE EFFECT OF PH ON THE ADSORPTION OF MICRONUTRIENT CATIONS OF CA 2+ AND K + BY SILICA FROM LAPINDO MUD Ikhsan, Jaslin; Sulastri, Siti; Priyambodo, Erfan
Jurnal Penelitian Saintek Vol 20, No 1: April 2015
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1406.394 KB) | DOI: 10.21831/jps.v20i1.5603

Abstract

The aim of this research was to determine the effect of pH on the adsorption of micronu- trients of Ca 2+  and K . by silica from lapindo mud. Data were collected by the adsorption experiments, on which 3 grams of silica separated from Lapindo mudwere dissolved in 300 mL of 0.0001 or 0.001 M Ca + 2+ or K ., and stirred for 2 hours. The pH of suspension was varied and left for equilibrate for 2 hours, and a sample was taken and measured for free concentration of K + + .cation  using Flame Atomic Emission Spectroscopy and of Ca  using Atomic Absorption Spectroscopy (AAS). The pH ranges were from 3 to 10. Temperature o  30 C and contact time of 2 hours were maintained. The research showed that both cations were adsorbed in sigmoid curve, increased with increasing pH values. In entire ranges of observed pH, the percentage of cations adsorbed by silica was not different signi? cantly. The adsorbent of silica formed silanol (SiOH) in water. The ?OH groups of silica were protonated forming SiOH o at lower pH and deprotonated forming SiO¯ at higher pH. Wether Ca 2+  or K + 2 + . cations were bound to silica surfacesvia cation exchange reactions, on which Ca2+ or K + . exchanged H of SiOH using one charge of the cations, forming [SiO(CaO)] for Ca 2+ , and [SiO-K] for K