Effect of solution pH and initial solute concentration of organic compound on the adsorption by Pentace triptera.

The project is to examine the effect of solution pH and initial concentration on the
adsorption of organic compound by Pentace triptera. In this project Pentace triptera is
used as adsorbent to remove benzene and toluene in wastewater. Adsorption concept is
applied in this project. Fix size of grinding Pentace tripera used as adsorbent and
various of concentration and pH of benzene and toluene are prepared. Samples shake
with adsorbent using rotary shaker. After adsorption, samples are tested by using UVvis
spectrophotometer. Result show that the concentration of benzene and toluene after
adsorption higher than before adsorption. First hypothesis was desorption of benzene
and toluene occurs by Pentace triptera. Project continues by using Gas
Chromatography Mass Spectrometer. Qualitative result show benzene and toluene
concentration at different pH sample are zero. Separation of component sample has
been show on chromatogram. Samples contain many components after adsorption based
on peak appearance on chromatogram. Most of the samples we're found to contain
carbamic acid. Hypothesis from GCMS result were the carcinogenic compound shown
by benzene and toluene. Different between GCMS and UV-vis explaining the
qualitative measurement by Uv-vis may contribute to error in measurement of benzene
and toluene concentration. Benzene and toluene were adsorbed by pentace triptera and
at the same time benzene and toluene extract and digest Pentace Triptera leaves. Leaves
normally contain chlorophyll and many other organic compounds such as amine group.
Carbamic acid is the component that identifies to be mostly extracted from Pentace
triptera leaves where toluene gives more formation of carbamic acid in sample.