SINTESIS MCM-41 DENGAN METODE HIDROTERMAL: PENGARUH WAKTU HIDROTERMAL, RASIO CTA/TMA DAN RASIO Si/Al

MUSTOFA AHDA, Dr. Sutarno, M.Si.

2011 | Tesis | S2 Ilmu Kimia

Telah dipelajari pengaruh penambahan aluminat dan tetrametilammonium hidroksida (TMAOH) dalam proses sintesis MCM-41 dengan surfaktan cetiltrimetilammonium bromide (CTAB). MCM-41 disintesis dengan metode hidrotermal menggunakan komposisi molar 1 SiO2 : 0,25 CTAB : 0,29 Na2O : 50 H2O. Pengaruh aluminat dan TMAOH dipelajari dengan menambahkan aluminat dalam sintesis MCM-41 dengan rasio mol Si/Al= 23 dan 80, sedangkan penambahan tetrametilammonium hidroksida dengan rasio mol CTA/TMA= 1 dan 1,25. Studi tentang pengaruh penambahan aluminat dan TMAOH meliputi karakter, stabilitas material MCM-41 dan kemampuannya dalam mengadsorpsi metilen biru. Hasil penelitian menunjukkan bahwa penambahan aluminat dan TMAOH dapat menurunkan intensitas relatif namun dapat meningkatkan stabilitas MCM-41. Penggunaan TMAOH dengan rasio mol CTA/TMA = 1 menghasilkan stabilitas hidrotermal yang lebih baik dengan kristalinitas 88 % setelah pengujian hidrotermal 100ËšC selama 24 jam. Al-MCM-41 memiliki kapasitas adsorpsi terhadap metilen biru 4 kali lebih besar daripada MCM-41 dan MCM-41 dengan adanya TMAOH. Kinetika adsorpsi metilen biru oleh Al-MCM-41 mengikuti model pseudo orde dua dengan harga konstanta laju adsorpsi sebesar 0,01 g.mg-1.menit-1.

The effect of aluminate and tetramethylammonium hydroxide (TMAOH) addition in the MCM-41 synthesis with cetyltrimethylammonium bromide surfactant (CTAB) was studied. MCM-41 was synthesized with molar composition 1 SiO2 : 0.25 CTAB : 0.29 Na2O : 50 H2O with hydrothermal method. Effect of addition of aluminate and the TMAOH was studied at a mol ratio of Si/Al = 23 and 80 in the synthesis of MCM-41, while a mol ratio of CTA/TMA was performed at 1 and 1.25. The effect of aluminate and TMAOH on the characteristics, stability of MCM-41 material and its ability to adsorb methylene blue was also investigated. The results showed that the addition of aluminate and TMAOH decreased the relative intensity but it increased the stability of MCM-41. Use of TMAOH with mol ratio of CTA/TMA = 1 has a better hydrothermal stability with 88% crystallinity after hydrothermal test at 100 ËšC for 24 hours. The adsorption capacity of Al-MCM-41 for methylene blue was 4 times more than the MCM-41 and MCM-41 with TMAOH. Adsorption of methylene blue by Al-MCM-41 followed pseudo second order model with the adsorption rate constant of 0.01 g.mg-1.min-1.

Kata Kunci : MCM-41, TMAOH, Aluminat, Stabilitas, Metilen Biru