| Summary: | 碩士 === 國立清華大學 === 生醫工程與環境科學系 === 104 === Nanoscale zerovalent iron (nZVI) has been widely used in environmental remediation. It has low toxicity, abundance in the world, suitable potential for triggering the reduction make it a promising material in decades. However, the ferromagnetism of ZVI nanoparticles leads to aggregation, causing low reactivity and mobility. In recent years, using solid supports for nZVI is one of the methods enhancing its reactivity. In this study, a facile approach for the synthesis and immobilization of ZVI nanoparticles onto reduced graphene oxide (rGO) have developing by adding NaBH4 as reducing agent. By adjusting the weight ratio between iron precursors and graphene oxide, we can purchase the well-dispersed ZVI nanoparticles on reduced graphene oxide. In this study, the diameter of particles of rGO-Fe nanocomposites was about 44.1 nm. Its pseudo-first rate constant (kobs) of TCE degradation can reach to 9.40×10-3 h-1, which was 3 times higher than conventional ZVI. Due to synergetic effect, adding second metal ions can significantly enhanced the reactivity of rGO-Fe nanocomposites. The kobs for TCE degradation were 5.89, and 53.6 h-1 at 1.877 mM Ni(II), 0.105 mM Pd(II). Both of them are much higher than rGO-Fe nanocomposites alone ( 9.40×10-3 h-1). The result obtained in this study proving that immobilization of ZVI nanoparticles on reduced graphene oxide is successful in water treatment. Its high reactivity and large surface area make it have potential developing in multifunctional use in environmental application.
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