Abstract
Fly ash is an ash with smooth granular shape and black grey color. It is a waste material produced from the burning of coal. The contain of fly ash especially is silica and alumina that it can be used as adsorbent. As adsorbent, fly ash as used to decrease water hardness at Darmakradenan Village, Ajibarang District. The result showed that the porosity of fly ash was 13.6056%, the water content was 0.055%, adsorption capacity of iodium was 216.8975 mg/g, and adsorption capacity of methylen blue was 0,3891 mg/g. Fly ash could decrease total water hardness. The adsorption rise when contact time was added. Adsorption reached equilibrium at contact time 120 minutes with decreasion percentage 63.6363%.
Highlights
Abu terbang merupakan material oksida anorganik berwarna abu-abu kehitaman yang mengandung silica dan alumina aktif karena sudah melalui proses pembakaran pada suhu tinggi
Fly ash is an ash with smooth granular shape
a waste material produced from the burning of coal
Summary
Bahan yang digunakan dalam penelitian adalah abu terbang yang diambil dari PLTU Desa Karangkandri, Kec.Kesugihan, Kab.Cilacap Jawa Tengah, metilen biru, iodium, natrium tiosulfat, buffer NH4Cl, EDTA, nheksana, KI, CaCO3, dan indicator EBT. Peralatan yang diperlukan adalah peralatan gelas yang biasa digunakan di laboratorium kimia, oven, tanur, shaker, XRF, dan spectrometer UV-Visible. Analisis komposisi kimia abu terbang dilakukan menggunakan alat XRF. Porositas Piknometer kosong ditimbang (w1), kemudian diisi penuh dengan nheksana dan ditimbang (w2). Piknometer dengan bubuk sampel setinggi 1⁄4 piknometer ditimbang (w3) dan piknometer dengan bubuk sampel dengan n-heksana sampai penuh juga ditimbang (w4), kemudian porositasnya dihitung dengan persamaan berikut : Keterangan : w1 = berat piknometer kosong w2 = berat piknometer + n-heksana w3 = berat piknometer + sampel w4 = berat piknometer + sampel +
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