SYNTHESIS OF NANOPOROUS NIO MATERIAL AS A CATALYST FOR METHYLENE BLUE REDUCTION

• Main Author: Indah Pratiwi, Nuraida
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/81407
• Institution: Institut Teknologi Bandung

Methylene blue (MB) is a water environmental pollutant that is very dangerous for the environment and human health because of its highly toxic, carcinogenic and mutagenic properties. Currently, various methods have been attempted to reduce MB pollution. Several studies show that chemical reduction is a promising way to reduce this pollution because the method is simple and low cost. A heterogeneous catalyst is needed to assist the MB reduction process. Nickel oxide (NiO) is a heterogeneous catalyst used in the MB reduction process. NiO in the form of nanoparticles shows the best efficiency in selectivity, catalytic activity, and stability as a heterogeneous catalyst. However, NiO nanoparticles have the disadvantage that they are difficult to separate from the mixture because of the small size. Consequently, they cannot be used repeatedly. Recently, nanoporous materials have attracted much attention, especially for catalytic applications. FDU-12 is a nanoporous material with a fairly wide pore diameter, large surface area, and high pore volume and is easily separated in mixtures. In this research, we developed a nanoporous NiO catalyst via the nanocasting method for the MB reduction reaction. In this case, FDU-12 is used as the printing agent. The scope of the research is limited to nanoporous NiO synthesized from nickel nitrate impregnated with the mesoporous material FDU-12 as a molding agent. Several characterizations such as TEM, XRD, FTIR and UV-Vis have been carried out to analyze the catalyst and its activity. The characterization results show that the pore size of FDU-12 is 10 nm and the nanoporous NiO particle size is 7 nm. The XRD result show that nanoporous NiO is evidenced at peaks 2? = 37.31o, 43.39o, and 62.91o. Based on the catalytic test of nanoporous NiO in the MB reduction reaction, a conversion percentage of 86.8% was obtained. This result is 2 times greater than the %conversion value for conventional NiO (40.5%). In addition, the kinetic parameters obtained are as follows; kobs = 0.07 min-1, Eobs = 0.18 kJ/mol, ?H‡ = 17.78 kJ/mol, ?S‡ = -0.187 J/mol.K, and ?G‡ = 73.64 kJ/mol. The MB reduction catalysis reaction mechanism in this study follows the Langmuir-Hinshelwood reaction mechanism. This research can provide valuable insights in the development of efficient catalysts to overcome the problem of environmental pollution by textile dye waste.