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Sintesis partikel silika magnetik
berpori dengan metode hidrotermal dan aplikasinya sebagai adsorben Cd2+
telah dilakukan. Tujuan dari penelitian ini adalah mensintesis partikel silika
magnetik berpori, mengetahui pengaruh metode hidrotermal pada partikel silika
magnetik berpori serta melakukan adsorpsi ion logam Cd2+. Sintesis dilakukan dalam dua tahapan
yaitu pertama sintesis partikel magnetit dan kedua sintesis silika magnetik
berpori. Produk yang dihasilkan kemudian dikarakterisasi dengan menggunakan
instrumen XRD, FTIR, VSM, SAA, SEM dan TEM. Uji kinerja adsorben silika
magnetik berpori yaitu dengan mengukur sisa konsentrasi ion Cd2+ setelah
proses adsorpsi menggunakan analisis AAS. Parameter yang dipelajari dalam proses
adsorpsi ini meliputi pengaruh pH, waktu kontak dan variasi konsentrasi awal
ion logam.
Hasil penelitian menunjukkan penggunaan
hidrotermal dapat meningkatkan kristalinitas dan luas permukaan dari silika
magnetik dibanding tanpa metode hidrotermal. Studi adsorpsi ion Cd2+ terhadap
adsorben silika magnetik berpori menunjukkan pH optimum dan waktu optimum pada proses
adsorpsi yaitu pH 8 pada waktu 15 menit. Studi kinetika adsorpsi ion Cd2+ mengikuti
orde reaksi dua semu dengan nilai konstanta laju reaksi sebesar 0,9130 g mg-1
menit-1. Mekanisme adsorpsi
ion Cd2+ terhadap adsorben silika magnetik berpori mengikuti model
isoterm Langmuir dengan kapasitas adsorpsi 1,7733 mg g-1 dan energi
adsorpsi sebesar 35,735 kJ mol-1.
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Synthesis of porous magnetic silica
particles using the hydrothermal method and its application as Cd2+
adsorbents has been carried out. The purpose of this study was to synthesis
porous magnetic silica particles, to determine the effect of the hydrothermal method
on the porous magnetic silica particles and to adsorp of Cd2+ metal
ions using the porous magnetic silica adsorbent. This synthesis is in two steps,
the first synthesis of magnetite particles and the second synthesis of porous
magnetic silica. The resulting product was then characterized using XRD, FTIR,
VSM, SAA, SEM and TEM instruments. Performance test of porous magnetic silica
adsorbent by measuring the remaining Cd2+ ion concentration after
the adsorption process using AAS analysis. Parameters studied in this
adsorption process include the influence of pH, contact time and variations in
the initial concentration of metal ions.
The
results showed that the use of hydrothermal can increase the crystallinity and
surface area of ??magnetic silica compared than without hydrothermal method. Adsorption
study of Cd2+ ions on porous magnetic silica adsorbent showed
optimum at pH 8 and optimum time of 15 minutes. The adsorption kinetics of
Cd(II) ions follows the apparent second reaction order with a reaction rate
constant value 0.9130 g mg-1 minute-1. The adsorption
mechanism of Cd2+ ions on the porous magnetic silica adsorbent
follows the Langmuir isotherm model with an adsorption capacity of 1.7733 mg g-1
and an adsorption energy of 35.735 kJ mol-1.
Kata Kunci : magnetic silica, hydrothermal, Cd(II) ions, adsorption
