Penelitian ini bertujuan untuk mensintesis zeolit-A dari abu dasar dengan pemisahan kandungan Fe dan Ca sebelum dilakukan peleburan. Zeolit-A disintesis menggunakan ekstrak yang dihasilkan melalui metode peleburan abu dasar pada suhu 750 o C dalam atmosfer udara yang diikuti proses hidrotermal pada suhu 100°C selama 12 jam. Hasil menunjukkan bahwa kristalinitas zeolit-A dengan pemisahan Fe dan Ca sebesar 88,64% dengan tingkat kemurnian yang lebih besar, sementara pada zeolit-A tanpa pemisahan Fe dan Ca yang telah dilaporkan pada penelitian sebelumnya didapatkan kristalinitas sebesar 84,19% dengan tingkat kemurnian yang lebih rendah.

The aim of this research is to synthesize mesoporous silica directly from the bottom ash waste through the melting method using alkali at high temperatures. The resulting mesoporous silica will be used as CH4 gas adsorbent. The bottom ash waste was firstly separated by Fe and Ca using 37% HCl followed by melting at high temperatures and producing silica extract. The extract will be used as the basic material for making mesoporous silica which impregnation with PEG 4000. The resulting solids will then be characterized using XRD and BET. The result of mesoporous silica was then carried out by measuring CH4 gas adsorption capacity by gravimetric method with interval temperature of 30, 40, and 50 °C and pressure of 1, 3, and 5 atm.

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Nitrogen-doped activated carbon (SBACN) was synthesized from sugarcane bagasse waste as acarbon source and urea as nitrogen source through potassium hydroxide (KOH) activation for 2 h at high temperature via two step methods. The synthesized SBCN was characterized using X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), and Fourier Transform Infrared (FTIR). The results showed that the SBCN has low degree crystallinity and graphitization with highly developed micropores due to synergistik activation effect of KOH and urea. These characteristics provide an important contribution to carbon dioxide adsorption capacity, which can reach up to 11,20% wt and this value is higher than pristine activated carbon. The results indicating that the presence of this nitrogen functionalities is found to have a beneficial influence on the carbon dioxide adsorption characteristic in standart condition and exhibit considerable potential in solid adsorption.