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Diah Rizki
Universitas Sam Ratulangi
Chemistry

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ADSORPSI ION TEMBAGA(II) MENGGUNAKAN AMPAS DAUN TEH SEBAGAI ADSORBEN Rizki, Diah
CHEMISTRY PROGRESS Vol 3, No 2 (2010)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.3.2.2010.18980

Abstract

ABSTRACT Gusti, D. R. and A. Wuntu, 2010. Absorption of Cupper (II) ion using tea leaves dregs as adsorbent.An investigation on the adsorption of copper (II) by using the dregs of tea leaves as an adsorbent. The research results are obtained that the adsorption of metal ions Cu (II) with a concentration of 500 mg /L at the dregs of tea leaves as adsorbent 0.1 g for 20 minutes has a contact time of equilibrium at 190-200 minutes. This adsorption followed the Freundlich isotherm model. Adsorption process is highly dependent on initial concentration, the higher the initial concentration of metal ions Cu (II), the higher the concentration of metal ions Cu (II) adsorbed. Adsorption capacity of Cu (II) on waste tea leaves are estimated from graphs isoterm adsorption worth more than 45 mg for every gram of adsorbent.Keywords : adsorption, ion copper (II), waste tea leaves, and adsorption capacity
LAJU KOROSI DALAM LARUTAN ASAM SULFAT DENGAN MENGGUNAKAN INHIBITOR ASAM OKSALAT Rizki, Diah
CHEMISTRY PROGRESS Vol 1, No 2 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.2.2008.4956

Abstract

The objectives of this research were study the effect of addition oxalat acid on inhibiting of stainless steelcorrosion in sulfuric acid solution. The stainless steel sample sieved and macerated in sulfuric acidsolution with concentration 0.05 M for 24, 48 and 72 hours. The corrosion rate are evaluated with Asdimof method. The result showed that corrosion rate of stainless steel in sulfuric acid for 72 hour is 0,1309mg/ cm2jam. The corrotion rate rate of stainless steel in sulfuric acid with addition axalat acid inhibitor withconcentracion 1.10-3M , 2.10-3M , 3.10-3M , 4.10-3M for 72 jam were 0,0157 , 0,0188, 0,017 , and 0,0165mg/cm2hour. . It is concluded thatoxalat acid having inhibition effect on stainless steel corrosion Keywords: oxalate acid, stainless steel, corrosion, sulphuric acid
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