Dalam kajian ini, abu sekam padi (RHA) telah digunakan untuk menghasilkan magnet RHA-Fe (III) hidrogel melalui dua kaedah, silang dan sol-gel yang menggunakan cecair ionik bmimCl sebagai pelarut. Magnet Rha-Fe (III) hidrogel yang telah dihasilkan kemudian digunakan dalam hidrolisis ammonia borane (NH3BH3) untuk menghasilkan hidrogen dan mengenal pasti kesan dua parameter; iaitu penambahan jumlah pemangkin dan suhu tindak balas. Selain itu, pencirian magnet Rha-Fe (III) hidrogel yang telah disediakan dan digunakan dalam hidrolisis juga telah dikaji dengan menggunakan SEM, SEM-EDX dan FTIR. Analisis daripada SEM, SEM-EDX dan FTIR menunjukkan bahawa Fe3O4 telah tersebar dan melekat di permukaan matriks silika RHA untuk kedua-dua hidrogel. Parameter-parameter ini memberi kesan kepada masa yang diperlukan untuk menghasilkan hidrogen. Dengan meningkatkan jumlah hidrogel yang digunakan dan meningkatkan suhu tindak balas, pengeluaran gas hidrogen melalui hidrolisis menjadi lebih cepat. Tenaga pengaktifan bagi hidrogel silang ialah 19 kJ mol-1 manakala sol-gel pula ialah 97 kJ mol-1.
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In this study, rice husk ash (RHA) was used to synthesize the magnetic RHA-Fe (III) hydrogels via two method, cross-linking and sol-gel method using ionic liquid bmimCl as solvent. The prepared magnetic RHA-Fe (III) was then used in the hydrolysis of ammonia borane (NH3BH3) for hydrogen generation and the effect of two parameters; amount of catalyst added and reaction temperature were investigated. Moreover, the characterization of the prepared and spent magnetic RHA-Fe (III) hydrogels were also studied using SEM, SEM-EDX and FTIR. SEM, SEM-EDX and FTIR showed that the Fe3O4 was successfully and uniformly dispersed on the surface of RHA silica matrix for both hydrogels. Both of these parameters affected the hydrogen generation with respect to time taken. By increasing the amount of hydrogels used and increasing the reaction temperature, the production of hydrogen gas through hydrolysis became faster. The activation energy for cross-linking hydrogel and sol-gel hydrogels were calculated as 19 kJ mol-1 and 97 kJ mol-1 respectively.
Hydrogen production through hydrolysis of ammonia borane (nh3bh3) by using magnetic hydrogel synthesized from rice husk ash / Nurul Wafa Ali