SYNTHESIS OF HYBRID MATERIAL AU NANOPARTICLE /ORGANOSILANE/ZSM-5 AS A CATALYST FOR P-NITROPHENOL REDUCTION WITH NABH4

• Main Author: Erika, Denanti
• Format: Theses
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/55103
• Institution: Institut Teknologi Bandung

Currently, research on nanoparticle materials as catalysts is growing rapidly. One type of metal nanoparticles currently being developed is Au nanoparticles, which have unique physical and chemical properties. Apart from its potential in the field of catalysis, Au nanoparticles are also frequently used in the field of bio-labeling, nonlinear optical devices, and in the field of medicine as drug delivery, developing strategies as anti-bacterial, anti-microbial, anti-cancer, and imaging materials for DNA detection. In the preparation of Au nanoparticles, a buffer material is needed, to prevent agglomeration of Au particles. One of the buffer materials that are widely used in the preparation of metal nanoparticle catalysts is zeolite ZSM-5. In the synthesis process, the Au nanoparticles are not firmly attached to the buffer material. To overcome this problem, it is necessary to add binder materials such as organosilanes, namely amines (3-Aminopropyl)-triethoxysilane, APTES) and thiols (3-mercaptopropyl)-trimethoxysilane, MPTMS) for stabilization of Au nanoparticles through electrostatic interactions. One way to study the performance of Au nanoparticles as a catalyst is the p-nitrophenol reduction reaction. It is known that p-nitrophenol is a phenol derivative that has anthropogenic properties which are dangerous if it pollutes the environment. p-nitrophenol pollutants can be removed through a reduction reaction using the NaBH4 compound. The result of reduction of a p-nitrophenol compound by NaBH4 is a p-aminophenol compound that is relatively safe for the environment. In this study, Au nanoparticles that have been successfully synthesized are <50 nm in size. The kinetics study shows that Au nanoparticles using ZSM-5 buffer material can be used as a catalyst in the p- nitrophenol reduction reaction by NaBH4. The thermodynamic parameters obtained are EObs, ?H‡, ?S‡, and ?G‡, which have been successfully determined using the Arrhenius and Eyring equations. Determining the reaction mechanism using the Arrhenius equation with various concentrations proves that the p- nitrophenol reduction reaction in this study follows the Eley-Rideal reaction mechanism. There was a decrease in the catalytic activity of the catalyst by about 30% within 10 minutes until the third reuse test. However, there was a slight decrease every time the nanoparticles were reused, the catalytic activity decreased and a small portion of the catalyst mass was lost during the reaction and recovery process.