P-nitrophenol degradation by gold nanoparticles augmented cellulosic microcapsules: Influence of catalyst dosage, reaction temperature and kinetic analysis

Abstract

For the parametric research of P-nitrophenol degradation (PNP) performance, the alginate encapsulating method was used to improve gold nanoparticles using cellulosic microcapsules. The goals are to investigate the gold nanoparticles's kinetic model in the degradation of PNP using UV-Vis spectrometry and to determine the parametric of the effect of AuNP-cellulose catalyst dose on efficiency of its removal and the role of AuNP-cellulose in PNP degradation at a variation of temperatures. The gold nanoparticle was formulated by reducing citrate technique and synthesised with coconut husk cellulose before being transformed into microcapsules and then formed into AuNP-cellulosic microcapsule beads. An excess quantity of sodium borohydride, NaBH4, was used as a model reaction to assess the catalytic performance of AuNPs for the reduction of PNP. The quantities of AuNP-cellulose catalyst have been weighted at 5, 7, and 10 mg for the dose of AuNP-cellulose catalyst on PNP elimination efficiency. With a 10 mg catalyst dose, the maximum PNP removal rate of 96.1 percent is achieved. When AuNP-cellulose reactions in degrading PNP are compared at different temperatures (28°C, 35°C, 45°C, and 55°C), the degradation is quicker at 55°C, taking just 5 minutes. The catalytic system's activation energy (Ea) for PNP degrading into PAP is 13.63 kJ/mol. This research indicates that as the catalyst dose is raised, the removal efficiency improves, and high temperatures accelerate PNP decrease.