Preparasi dan karakterisasi zeolit dari abu laying batu bara secara alkali hidrotermal

Abstract

Preparasi zeolit dari abu laying batu bara PLTU Suralaya secara alkali hidrotermal telah dilakukan. Preparasi dilakukan terhadap abu laying yang telah direfluks dengan HCl 1M dan tanpa refluks. Larutan NaOH dengan konsentrasi tertentu (1, 2 dan 3 M) dicampur dengan abu laying batu bara dengan rasio 10 ml larutan tiap 1 gram abu laying, ke dalam tabung Teflon 100 ml dalam suatu auto clave stainless-steel. Autoclave kemudian dipanaskan pada temperatur 80-16 0C selama 3 hari. Zeolit sintesis yang dihasilkan selanjutnya diuji secara kualitatif dengan menggunakan spektroskopi inframerah., dan Difraksi Sinar-X. Hasil penelitian menunjukkan bahwa aktivasi abu laying dengan proses alkali hidrotermal dapat material yang mempunyai struktur mirip zeolit (zeolit-like). Produk hidrotermal terdiri dari campuran zeolit ( Zeolit P, Zeolit Y) serta Kristal sodalit dan mulit. Pada temperatur 160 0C, diperoleh zeolit dengan kristalinitas lebih tinggi daripada 100 0C, baik melalui refluks atau tanpa refluks. Karakteristik zeolit yang terbentuk sangat ditentukan oleh kondisi proses, yang meliputi konsentrasi NaOH, waktu dan temperatur.Kata kunci : abu layang batu bara, alkali hidrotermal, preparasi, karakterisasi, zeolit

Synthesis and Characterization of Zeolite Materials from Power Plant Fly Ash

“…The XRD results show that the fly ash samples contain minerals of mullite, quartz and corundum. Based on the JCPDS card standard 01-075-8322, the quartz mineral is shown by the characteristic peak at 2θ of 20 [15] and Jumaeri et al [11] which stated that the fly ash of coalbased power plant contains minerals of quartz and mullite or aluminosilicates. Through the process of calcination, the minerals of silica and alumina in the fly ash are converted into a reactive amorphous silica and alumina form [18].…”

“…The synthesis of zeolite is referred to Jumaeri et al [11] Firstly, the NaOH solution (5 M) was mixed with calcinated fly ash with the ratio of NaOH solution:fly ash = 10:1 and distilled for 24 h. The mixture is poured into Teflon tube in a stainlesssteel autoclave. The hydrothermal reactor is then heated at 160 ºC for 72 h. The reaction product is filtered and washed with distilled water to pH 9 to 10 and then dried in an oven at 105 ºC for 2 h. The obtained solids were charac-terized using SEM-EDX, FTIR spectrophotometry, XRD, XRF and SAA methods.…”

“…The synthesis of zeolite can be carried out by a hydrothermal process at the glass phase dissolution stage using an alkaline solution. Glass phase is important in the formation of zeolites because it has a very high solubility in an alkaline solution [11]. The synthesis of zeolite from fly ash has been done through several methods and produces different types of zeolites.…”

“…This relates to the nature of the pores possessed, the active functional groups and the interchangeable cation balancer. The utilizations of zeolite from fly ash are for removing of radioactive cesium ions [13], as lead adsorbents [14] and for fixation of heavy metals such as Cu, Cd, Cr and Pb in waters [11]. One of the relatively underdeveloped zeolite utilizations is the material of crude palm oil (CPO) industrial waste processing.…”

Adsorption Kinetics of Fe and Mn with Using Fly Ash from PT Semen Baturaja in Acid Mine Drainage

“…The various uses of fly ash are as raw materials for cement production and construction materials [3]. As an adsorbent, fly ash has advantages of being economical, good for gas or liquid waste treatment [4], and capable of absorbing heavy metals in wastewater [5]. The condition of silica and alumina in fly ash is large enough to allow fly ash to be used as a potential adsorbent.…”