Abstract
In this study, a series of Co3O4 nanoparticle-functionalized mesoporous SiO2 (Co–SiO2) were successfully synthesized via a spontaneous infiltration route. Co species were firstly infiltrated into the confined spaces between the surfactant and silica walls, with the assistance of grinding CoCl3·6H2O and the as-prepared mesoporous SiO2. Then, Co3O4 nanoparticles (NPs) were formed and grown in the limited space of the mesopores, after calcination. Structures, morphologies, and compositions of the materials were characterized by X-ray diffraction, transmission electron microscopy, energy dispersion spectrum, N2 adsorption, and Fourier transform infrared spectra. Results showed that the high content of Co (rCo:Si = 0.17) can be efficiently dispersed into the mesoporous SiO2 as forms of Co3O4 NPs, and the structural ordering of the mesoporous SiO2 was well-preserved at the same time. The Co3O4 NP functionalized mesoporous SiO2 materials were used as Fenton-like catalysts for removing methylene blue (MB) from aqueous solutions. The catalyst prepared at rCo:Si = 0.17 could completely remove the high-concentration of MB (120 mg·L−1), and also showed an excellent performance with a removal capacity of 138 mg·g−1 to 180 mg·L−1 of MB. Catalytic mechanisms were further revealed, based on the degradation results.
Highlights
IntroductionWith the rapid increase in industrialization and urbanization, water pollution has become one of the major environmental threats to human health and ecosystems, over the last few decades [1]
With the rapid increase in industrialization and urbanization, water pollution has become one of the major environmental threats to human health and ecosystems, over the last few decades [1].Water pollution is broadly categorized into inorganic and organic
The structure and surface properties of the synthesized catalysts were characterized via X-ray along with energy‐dispersive X‐ray spectroscopy (EDS), Fourier transform infrared (FTIR) spectra, diffraction (XRD), N2 adsorption−desorption isotherms, transmission electron microscopy (TEM)
Summary
With the rapid increase in industrialization and urbanization, water pollution has become one of the major environmental threats to human health and ecosystems, over the last few decades [1]. Reactions have been widely studied due to their high efficiency in generating hydroxyl radicals for Conventional homogeneous Fenton catalysts are highly sensitive to solution pH and only exhibit decontamination of recalcitrant organic pollutants. Fenton are highly sensitive solution pHpH andrange, only exhibit a tends to decrease homogeneous when the solution pHcatalysts is increased [6] Aside fromto their narrow the other good catalytic performance within a narrow acidic condition range Metal orordered metal‐oxide‐loaded silica is promising, due to its large specific area, adjustable pore structure, and satisfactory hydrothermal mesoporous SiO2 materials have been widely utilized as heterogeneous catalysts for water treatment stability. This method could lead to a partial structure structure collapse of the mesoporous material, resulting in a decreased catalytic performance [20]. As a Fenton-like catalyst for removing organic dyes from wastewater
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