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Sintesis magnetit Silika Sulfonat Dari Pasir Besi Pantai Marina Untuk Adsropsi Ion Pb(II) da Ca(II) 546

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RINGKASAN

Pasir besi merupakan sumber daya alam yang melimpah di Indonesia tapi belum
dimanfaatkan dengan baik. Kandungan utama pasir besi adalah besi oksida, salah satunya yaitu
magnetit (Fe3O4). Magnetit merupakan besi oksida yang memiliki sifat kemagnetan kuat
sehingga partikelnya mudah dipisah dengan magnet batang. Namun, magnetit mudah bereaksi
dengan larutan asam sehingga permukaannya tidak stabil. Di sisi lain, silika sulfonat telah
banyak digunakan sebagai adsorben, sehingga pada penelitian ini, dicoba melapisi magnetit
dari sampel pasir besi Pantai Marina dengan silika sulfonat melalui metode sol-gel untuk
menghasilkan magnetit silika sulfonat. Produk yang dihasilkan digunakan untuk adsorpsi
logam Pb(II) dan Ca(II).
Metode yang digunakan dalam sintesis magnetit silika sulfonat yaitu metode sol-gel di
mana larutan silika ditambahkan partikel magnetit lalu ditetesi dengan campuran larutan HCl
dan garam mononatrium asam 4-amino-5-hidroksi-2-7-naftalena disulfonat (AHNSNa).
Magnetit diperoleh dari Pasir Pantai Marina Semarang melalui proses pengayakan dan
ekstraksi. Prekusor silika adalah natrium silikat yang divariasi konsentrasinya. Massa magnetit
dan konsentrasi campuran larutan HCl dan AHNSNa dibuat tetap. Magnetit silika sulfonat yang
diperoleh kemudian dikarakterisasi menggunakan spektrofotometri FTIR untuk mengetahui
gugus fungsi, dan SEM-EDX untuk mengetahui morfologi dan komposisi unsur penyusunnya.
Kemampuan adsorpsi magnetit silika sulfonat diketahui melalui proses adsorpsi ion logam
Pb(II) dan Ca(II) dengan variasi konsentrasi dan waktu.
Dalam penelitian ini diperoleh magnetit silika sulfonat yang berwarna abu-abu hingga
coklat kemerahan. Semakin besar konsentrasi natrium silikat, maka semakin besar rendemen
magnetit silika sulfonat yang diperoleh. Berdasarkan hasil karakterisasi dengan FTIR,
diperoleh pita serapan ±OH paling luas pada magnetit silika sulfonat dengan konsentrasi
natrium silika 20%.
Kata Kunci: magnetit silica sulfonate, sol gel, adsorpsi

SUMMARY

Iron sand is a natural resource that is abundant in Indonesia but has not been used well
yet. The main content of iron sand is iron oxides, which one of them is a magnetite (Fe3O4).
Magnetite is an iron oxide that has strong magnetic properties, hence its particles could be
separated by a magnetic bar easily. However, magnetite is easy to react with acid solutions,
hence its surface is not stable. On the other hand, silica sulfonate has been widely used as an
adsorbent. Thus, in this study, the coating of magnetite, which was extracted from Marina
Beach sands by sulfonate silica via sol-gel method to produce sulfonate silica magnetite were
conducted. Then, the resulting products were used for the adsorption of Pb (II) and Ca (II).
The method used in the synthesis of sulfonate silica magnetite was the sol-gel method
in which a solution of silica was added by magnetite particles and continued by dropwising a
mixture of HCl and monosodium 4-amino-5-hydroxy-2-7-naphthalenedisulfonate salt
(AHNSNa). The magnetite was obtained from Marina Beach sand Semarang through a sifting
and extraction process. The silica precursors were sodium silicate which their concentrations
varied. The magnetite mass and the concentration of HCl mixture and AHNSNa solution was
constant. Further, the sulfonate silica magnetites obtained were characterized using FTIR
spectrophotometry to determine the functional groups, and SEM-EDX to determine the
morphology and composition of the constituent elements. The sulfonate silica magnetite
adsorption capacities were determined through the adsorption of of Pb(II) and Ca(II) metal ions
with various concentrations and time.
In this Study, it was obtained that the sulfonate silica magnetite colours were gray to
reddish brown. The greater the concentration of sodium silicate, the greater the sulfonate silica
magnetite obtained. Based on the results of FTIR, the OH adsorption bands showed the widest
band was on the sample with the sodium silicate concentration of 20%.
Keywords: sulfonate silica magnetite, sol-gel, adsorption

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Ketersediaan

1333C16IV

1333 C 16

Perpustakaan FSM Undip (Referensi)

Tersedia

Informasi Detail

Judul Seri

KIMIA

No. Panggil

1333 C 16

Penerbit

: ., 2016

Deskripsi Fisik

-

Bahasa

Indonesia

ISBN/ISSN

-

Klasifikasi

1403

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

-

Info Detail Spesifik

-

Pernyataan Tanggungjawab

Rizky Indra Maulana

Versi lain/terkait

Lampiran Berkas

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