Abstract
This work reports the synthesis of natural zeolite-based silver and magnetite nanocomposites and their application for the catalytic oxidation of methylene blue in water. The zeolite was impregnated with 5.5 wt.% Fe in the form of magnetite nanoparticles with size of 32 nm, and with 6.4 wt.% Ag in the form of silver oxide and metallic silver nanoparticles with sizes of 42 and 20 nm, respectively. The results showed that physical adsorption contributed to the removal of methylene blue by 25–36% and that Fe3O4@NZU is superior to Ag2O@NZU and Ag0@NZU, leading to 55% removal without oxidant and 97% in the presence of H2O2. However, there is no evidence of significant mineralization of methylene blue. The application of reaction rate models showed that the reaction order changes from zero to first and second order depending on the H2O2 concentration.
Highlights
Pollution of water with organic dyes is a major concern due to their harmful effects to the environment and human health [1,2,3,4]
Zhang et al [40] observed no influence of the H2O2 on the reaction order but they used an organic form of Fe2+ and the reaction system is different
The zeolite was impregnated with approximately 5.5 wt% of Fe in the form of magnetite nanoparticles of size of 32 nm and 6.4 wt% Ag in the form of silver oxide and metallic silver nanoparticles of sizes of 42 and 20 nm, respectively
Summary
Pollution of water with organic dyes is a major concern due to their harmful effects to the environment and human health [1,2,3,4]. Leather, paper and other industries use dyes to color their products and waste significant amounts of water. This results in polluted and colored wastewater that requires treatment [5]. Unusual color of the water is the first sign of contaminated water with dyes; even 1 ppm of some dyes can be recognized without sophisticated equipment [9,10]. Methylene blue (MB) or methylthioninium chloride is an organic thiazine-class cationic dye commonly used in the cotton, pharmaceuticals, wood and textile industry. Other health effects after exposure to MB can be carcinoma of the bladder [12], tissue necrosis [13], spinal cord necrosis [14], paraplegia [11], infancy
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