SINTESIS KOMPOSIT GRANUL GEOPOLIMER-ZEOLIT DARI BAHAN BAKU LOKAL MENGGUNAKAN METODE HIDROTERMAL SEBAGAI ADSORBEN METILEN BIRU. (Indonesian)

Synthesis of Geopolymer-Zeolite Granule Composite from Local Raw Materials Using the Hydrothermal Method as Methylene Blue Adsorbent. (English)

Zeolite is known as a cation exchange adsorbent and has high adsorption capabilities. These two functions of zeolite have the opportunity to be a solution in dealing with cationic dye waste. The aim of this research was to determine the CEC value and adsorption capacity of zeolite in adsorbing methylene blue. Zeolite powder is made using local metakaolin and added NaOH or water glass using the hydrothermal method. The powdered zeolite product obtained was mixed with geopolymer to form a composite of small granules and large granules. The results of XRD characterization of the synthetic product obtained from a mixture of metakaolin and NaOH were NaA zeolite, while the addition of water glass resulted in NaX zeolite. Zeolite in powder form or geopolymer-zeolite granule composite shows a high cation exchange capacity (CEC) above 200 cmol/kg. The methylene blue adsorption test on each adsorbent showed that the adsorption capacities of NaA zeolite, NaX zeolite, NaA geopolymer-zeolite small granule and large granule composites, and NaX geopolymer-zeolite small granule and large granule composites were respectively 30.81 mg g^-1, 32.84 mg g^-1, 53.29 mg g^-1, 51.64 mg g^-1, 38.32 mg g^-1, 54.22 mg g^-1 and 48.81 mg g^-1 . [ABSTRACT FROM AUTHOR]

Zeolit dikenal sebagaisalah satu adsorben penukar kation dan memiliki kemampuan adsorpsi yang tinggi. Kedua fungsi zeolit tersebut berpeluang menjadi solusi dalam mengatasi limbah pewarna kationik. Tujuan dari penelitian ini untuk mengetahui nilai KTK dan kapasitas adsorpsi zeolit dalam menjerap metilen biru. Zeolit serbuk dibuat menggunakan metakaolin lokal dan ditambahkan NaOH maupun water glass dengan metode hidrotermal. Produk zeolit serbuk yang diperoleh dicampurkan dengan geopolimer membentuk komposit granul kecil dan granul besar. Hasil pencirian XRD dari produk sintetik yang diperoleh pada campuran metakaolin dan NaOH ialah zeolit NaA, sedangkan pada penambahan water glass dihasilkan zeolit NaX. Zeolit dalam bentuk serbuk maupun komposit granul geopolimer-zeolit menunjukkan kapasitas tukar kation (KTK) yang tinggi diatas 200 cmol/kg. Uji adsorpsi metilen biru pada masing-masing adsorben menunjukkan kapasitas adsorpsi zeolit NaA, zeolit NaX, komposit granul kecil dan granul besar geopolimer-zeolit NaA, serta komposit granul kecil dan granul besar geopolimer-zeolit NaX secara berurutan sebesar 30.81 mg g^-1, 32.84 mg g^-1, 53.29 mg g^-1, 51.64 mg g^-1, 38.32 mg g^-1, 54.22 mg g^-1dan 48.81 mg g ^-1 . [ABSTRACT FROM AUTHOR]

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