ANALISIS STRUKTUR DAN POROSITAS KOMPSOSIT Fe3O4-KARBON AKTIF DARI LIMBAH KERTAS SEBAGAI ADSORBEN MAGNETIK
DOI:
https://doi.org/10.17146/jsmi.2018.19.4.4886Keywords:
Nanopartikel Fe3O4, Karbon aktif, Komposit, Limbah kertas, Adsorben magnetikAbstract
ANALISIS STRUKTUR DAN POROSITAS KOMPOSIT Fe3O4-KARBON AKTIF DARI LIMBAH KERTAS SEBAGAI ADSORBEN MAGNETIK. Komposit partikel magnet-karbon aktif dari limbah kertas telah berhasil dibuat. Karbon aktif dibuat dengan cara bahan kertas bekas dibakar dan selanjutnya direndam dalam asam kuat. Komposit Fe3O4-karbon aktif dibuat dengan mencampurkan garam besi Fe3+/Fe2+ (rasio mol 2 : 1) dengan suspensi karbon aktif dalam air. Larutan campuran garam besi-karbon aktif ditambahkan larutan NaOH tetes demi tetes pada kondisi suhu 70 oC. Analisis struktur, morfologi, ikatan kimia, sifat magnet dan porositas diselidiki dengan berbagai alat, berturut-turut menggunakan alat XRD, SEM, FTIR, VSM dan adsorpsi-desorpsi N2 Quantasorb. Hasil karakterisasi menunjukkan bahwa nanopartikel Fe3O4 telah berhasil tercangkok pada struktur karbon melalui interaksi gugus hidroksil. Bahan komposit mempunyai sifat magnetik berkelakuan superparamagnetik. Keberadaan nanopartikel Fe3O4 pada struktur karbon membentuk sistem mesopori baru, dimana volume pori meningkat dari 0,07 cc/g menjadi 0,464 cc/g (meningkat 6 kali untuk karbon tanpa aktivasi dan meningkat dari 0,1053 cc/g menjadi 0,525 cc/g (meningkat 5 kali) untuk karbon aktivasi dengan sebaran ukuran pori rata-rata 17,5 nm. Hasil uji adsorpsi menunjukkan bahwa senyawa fenol dan metil jingga hanya mampu diserap 30% dalam larutan air, tetapi untuk senyawa metilen biru mampu diserap 96,3% pada kondisi yang sama. Bahan komposit partikel magnet Fe3O4/karbon aktif limbah kertas dapat digunakan sebagai bahan alternatif menghilangkan zat warna metilena biru dalam limbah cair.
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