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Adel Fisli
Pusat Sains dan Teknologi Bahan Maju-BATAN
Materials Science & Nanotechnology

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ANALISIS STRUKTUR DAN POROSITAS KOMPSOSIT Fe3O4-KARBON AKTIF DARI LIMBAH KERTAS SEBAGAI ADSORBEN MAGNETIK Adel Fisli; Rahma Dina Safitri; Nurhasni Nurhasni; Deswita Deswita
Jurnal Sains Materi Indonesia Vol 19, No 4: JULI 2018
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (76.498 KB) | DOI: 10.17146/jsmi.2018.19.4.4886

Abstract

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.
THE EFFECT OF CALCINATION ON MICROWAVE ABSORBING PROPERTIES OF Fe3O4/TiO2 COMPOSITE Adel Fisli; Didin Sahidin WinataPura; Wisnu Ari Adi; Yana Taryana
Jurnal Sains Materi Indonesia Vol 20, No 2: JANUARY 2019
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (636.541 KB) | DOI: 10.17146/jsmi.2019.20.2.5292

Abstract

THE EFFECT OF CALCINATION  ON MICROWAVE ABSORBING PROPERTIES OF Fe3O4/TiO2 COMPOSITE. The Fe3O4/TiO2 composites have been fabricated by simple precipitation method for microwave absorbing. The obtained powder of Fe3O4/TiO2 which 10 % iron oxide containing were calcinated from 300oC – 700oC for 3 hours. The characteristic of samples was investigated by various techniques. The TEM image showed the composites form agglomeration with particles size of around 20 nm.  The all sample contents most of the anatase phase. The increasing of calcination temperature is the bigger of crystallite size. The Raman bands shift towards lower wavenumber and their full-widths at half-maximum (FWHM) of the bands decreases as the particles size increase. The measurement of the magnetic properties illustrated that the Fe3O4/TiO2 exhibited paramagnetic behavior at room temperature. The microwave absorbing properties of the sample was measured by VNA  using frequency microwave filter in  X-band range  (8-12 GHz). The reflection loss (RL) values were calculated for thickness 1 mm of the sample. The minimum reflectivity peak value tends to decrease with the increase of the calcination temperature due to increasing the crystallite size of the particles. The lowest reflectivity value of Fe3O4/TiO2 was occurred calcinated at 600oC with -13.4 dB loss at 10.9 GHz, that is more 80% absorbed of the electromagnetic wave in thickness 1 mm of the sample. The microwave absorption properties the calcinated 700oC the sample decrease due to the loss of magnetic properties of the sample. This study concluded that increase in average crystalline size, microwave absorption properties increased. However, the decrease dratisly of magnetic properties of the sample causes microwave absorption properties to decrease.
Co-Authors Deswita Deswita Didin Sahidin Winatapura Nurhasni, N. Rahma Dina Safitri Wisnu Ari Adi Yana Taryana