ADSORPTION OF HG(II) IONS USING FLOATING ?-CARRAGEENAN BEADS ADSORBENT
Mercury is one of the heavy metals that is carcinogenic and can accumulate in human cells. Mercury in the environment comes from gold mining activities, the battery industry, and the thermometer industry. These industrial activities produce mercury waste that can pollute the environment. One w...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/82785 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Mercury is one of the heavy metals that is carcinogenic and can accumulate in human cells.
Mercury in the environment comes from gold mining activities, the battery industry, and the
thermometer industry. These industrial activities produce mercury waste that can pollute the
environment. One way to reduce mercury levels is by adsorption method. Adsorbents that can
be used for the adsorption of Hg(II) ions are ?-carrageenan with an anionic surface of sulfate
ester groups that can attract Hg(II) ions. In this study, floating ?-carrageenan beads adsorbent
was used to adsorb Hg(II) ions. Floating beads will facilitate the retrieval of the adsorbent after
contact. Floating ?-carrageenan beads were prepared using a mixture of ?-carrageenan and
CaCO3 with a mass ratio of 8:2. CaCO3 solution will react with the acid to form cavities in the
?-carrageenan beads. Characterization of the adsorbent was carried out by determining the
swelling degree, flotation test, functional group analysis using Fourier Transform Infrared
(FTIR) spectroscopy, morphological analysis, and elemental composition on the adsorbent
surface using Scanning Electron Microscope-Energy Dispersive X-ray Spectroscopy (SEM
EDS). FTIR results showed shifts in the absorption peaks of O-H and O=S=O vibrations of
?-carrageenan moieties. SEM results showed changes in adsorbent morphology before and
after contact. EDS results showed the presence of Hg(II) ions on the adsorbent surface after
contact. The adsorption ability of floating ?-carrageenan beads was carried out by measuring
the residual Hg(II) ions after the adsorption process using Cold Vapor-Atomic Absorption
Spectrometry (CV-AAS). The optimum conditions for adsorption of Hg(II) ions by floating
?-carrageenan beads were obtained at pH 3, contact time for 120 minutes, and adsorbent mass
of 0,1 gram. Adsorption of Hg(II) ions using floating ?-carrageenan beads followed the pseudo
second-order adsorption kinetics and Langmuir adsorption isotherm model with qmax of
29,56 mg.g?1 obtained at 50 °C. Thermodynamic study of adsorption of Hg(II) ions showed
that the adsorption was spontaneous and endothermic as judged from the ?G values at
temperatures of 303 K, 313 K, 323 K of ?25,84 kJ.mol?1, ?26,94 kJ.mol?1, and ?28,03 kJ.mol?1
respectively and the ?H and ?S values of 7,32 kJ.mol?1 and 109,45 J.K?1.mol?1 respectively. |
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