ANALISIS STRUKTUR DAN POROSITAS KOMPSOSIT Fe3O4-KARBON AKTIF DARI LIMBAH KERTAS SEBAGAI ADSORBEN MAGNETIK

Abstract

ANALISIS STRUKTUR DAN POROSITAS KOMPOSIT Fe 3 O 4-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 Fe 3 O 4-karbon aktif dibuat dengan mencampurkan garam besi Fe 3+ /Fe 2+ (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 o C. Analisis struktur, morfologi, ikatan kimia, sifat magnet dan porositas diselidiki dengan berbagai alat, berturut-turut menggunakan alat XRD, SEM, FTIR, VSM dan adsorpsi-desorpsi N 2 Quantasorb. Hasil karakterisasi menunjukkan bahwa nanopartikel Fe 3 O 4 telah berhasil tercangkok pada struktur karbon melalui interaksi gugus hidroksil. Bahan komposit mempunyai sifat magnetik berkelakuan superparamagnetik. Keberadaan nanopartikel Fe 3 O 4 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 Fe 3 O 4 /karbon aktif limbah kertas dapat digunakan sebagai bahan alternatif menghilangkan zat warna metilena biru dalam limbah cair.

ISOTHERM, KINETICS AND THERMODYNAMICS ADSORPTION STUDIES OF DYE ONTO Fe3O4-WASTE PAPER ACTIVATED CARBON COMPOSITES

“…The Fe3O4/activated carbon composites were prepared according to previous work [39]. Briefly, carbonisation of waste paper was carried out by pyrolysis process via the burned waste paper in laminar airflow and the activation of carbon was done by soaking into HCl concentrate.…”

“…Activated carbon naturally provides relative low surface area and pore volume. The acid treatment of activated carbon would increase the surface area, volume pore and site active expose [39], consequently its adsorption ability increases. Other literature mentions that the change of surface functional group and pore structure of activated carbon depend on the type of the acid used, therefore the resulting texture structure varies [37].…”

“…Thus, the incorporation of Fe3O4 nanoparticles with activated carbon possesses a double advantage, not only for the magnetic properties but also for increasing the adsorption capacity. Previous research mentioned that the presence of Fe3O4 nanoparticles in the activated carbon structure forms a new pore meso-system and the pore volume of the material increases highly [39]. It is observed that the increase of pore volume has played an important role to increase in the adsorption capacity of composites.…”

“…In the range of adsorbent doses from 0.5 to 2.5 g/L, the efficiency adsorption of MB increased from 19.1% to 90.8% and from 20.2% to 98% for KA-Fe3O4 and KA HCl-Fe3O4, respectively. The increase of adsorption efficiency due to the increasing availability of surface area of adsorbent in the solution [39].…”

“…In the authors previous work, the Fe3O4-waste paper active carbon composites has been successfully synthesized. The characteristics of the prepared sample has shown that the presence of Fe3O4 magnetic nanoparticles on the structure of activated carbon has led to the formation of a new mesopore system, magnetic properties and the performance of cation exchange properties [39]. In this work, as a continuation of the previous work, the authors objective is the investigation into the ability of Fe3O4-active carbon from waste paper to adsorb the dyes (methylene blue) in water.…”