Preparation and Optimization of Coal Fly Ash-Based Geopolymer and Its Application as an Adsorbent for Basic Yellow 2 and Methylene Blue Dyes

• 出版年: Alchemy
• 主要な著者: Eddy Heraldy, Edi Pramono, Yuniawan Hidayat, Khoirina Dwi Nugrahaningtyas, Angel Maydeleine, Intan Dwi Rahmadani
• フォーマット: 論文
• 言語: 英語
• 出版事項: Universitas Sebelas Maret 2026-03-01
• 主題: adsorption; basic yellow 2; coal; fly ash; geopolymer; methylene blue.
• オンライン･アクセス: https://jurnal.uns.ac.id/alchemy/article/view/98784
• ISSN: 1412-4092; 2443-4183

The preparation of geopolymer from coal fly ash (CFA) solid waste of Jepara PLTU has been carried out by activating CFA using a 10 M NaOH solution and Na2SiO3. Characterization of CFA and geopolymer using X-ray fluorescence (XRF), X-ray diffractometer (XRD), Scanning Electron Microscopy (SEM), and Fourier Transform Infra-Red (FTIR) spectroscopy. The adsorption process was studied under parameters including pH, geopolymer mass, contact time, and initial adsorbate concentration. The optimum conditions for the adsorption process of basic yellow 2 dye with fly ash-based geopolymer were optimum at solution pH of 11; adsorbent mass of 0.15 g; contact time of 120 minutes; and initial concentration of 80 ppm, while methylene blue adsorption was at solution pH of 11; adsorbent mass of 0.15 g; contact time of 120 minutes; and initial concentration of 60 ppm. Coal fly ash, a solid waste product from the Jepara PLTU, can be used to produce geopolymers through geopolymerization in the presence of activators such as NaOH and Na₂SiO₃. The adsorption capacities of these geopolymers for basic yellow 2 and methylene blue dye solutions are 26.55 and 19.825 mg/g, respectively.