BUAH API-API PUTIH (Avicennia alba Blume) TERMODIFIKASI ASAMMERKAPTOASETAT (AMA) SEBAGAI ADSORBEN ION Pb(II)DAN Cd(II);API-API PUTIH FRUIT (Avicennia alba Blume) MODIFIED BYMERKAPTOACETIC ACID (MAA) AS ADSORBENT OF Pb(II) ANDCd(II) IONS
2015
Avicennia alba Blume) unmodified and modified by mercaptoasetic acid (MAA)
to adsorb Pb(II) and Cd(II) ions. Modification was conducted through reacting
api-api putih fruit which had been activated by NaOH dan HNO3 with 5.0 M
mercaptoacetic acid at 30 °C and pH 7.1. Modification was aimed to increase the
effectivity and capacity of adsorption. Characterization of unmodified adsorbent
(UMA) and modified adsorbent (MA) was carried out by using spectrophotometer
infrared (FT-IR), Scanning Electron Microscope (SEM-EDS) and Gas Sorption
Analyzer (GSA). Adsorption study included optimization of adsorbent mass, pH
solution, contact time, initial concentration of heavy metal ion and temperature.
The result of MA characterization using spectrophotometer FT-IR showed
C-S bond at 694 cm-1 and the presence of sulphur (S) element on EDS spectrum
of 5.22 % mass as the result of modification with mercaptan (-SH). The results of
GSA at MA indicated an increasing surface area from 2,79 m2 g-1 to 39,24 m2 g-1
and pore volume from 0,0037 cm3 g-1 to 0,0368 cm3 g-1. Optimum condition of
MA to adsorption 50 mg L-1 of Pb(II) and Cd(II) ions was occured at each
adsorbent mass 0.1 g at pH 4 and 1.25 g at pH 6 within the same optimum time,
90 minutes. Adsorption kinetic of UMA and MA showed that Pb(II) and Cd(II)
ions followed pseudo second orde and isotherm Langmuir model. Maximum
capacity adsorption (qmax) UMA and MA of Pb(II) ion at 50 °C were 32.26 mg g-1
and 45.45 mg g-1. At the adsorption of Cd(II) ion, each of qmax UMA and MA
value was 23.81 mg g-1 and 27.03 mg g-1 at 30 °C. Adsorption Pb(II) and Cd(II)
ions showed that UMA and MA were chemisorption process with spontaneous
and exothermic adsorption reaction. The result of this study showed that api-api
putih fruit (Avicennia alba Blume) modified by merkaptoacetic acid has good
adsorption affinity toward Pb(II) and Cd(II) ions with increasing adsorption
capacity compared than unmodified.
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