Formation of manganese oxide shells on silica spheres with various crystal structures using surfactants for the degradation of methylene blue dye

Nanobubbles within a Microbubble: Synthesis and Self-Assembly of Hollow Manganese Silicate and Its Metal-Doped Derivatives

“…Due to the excellent catalytic activity of manganese-based solid compounds and the unique morphology of these hollow structures, we chose to study their adsorption and catalytic properties toward the degradation of cationic organic dyes, e.g. , rhodamine-6G and methylene blue, via an advanced oxidation process (AOP). , In this study, reported in Figure (also SI-3A), the nanobubbles of manganese silicate and the dye solution were allowed to establish an adsorption equilibrium for a period of 60 min. After establishing equilibrium, 20% and 30% of the initial rhodamine 6G and methylene blue molecules were adsorbed on the nanobubbles of manganese silicate, respectively.…”

pH-Dependent Degradation of Methylene Blue via Rational-Designed MnO2 Nanosheet-Decorated Diatomites

“…Manganese dioxides (MnO 2 ) have attracted intensive interest because of low cost, high activity/stability in alkaline/neutral media, environmental compatibility, and abundant availability. − Because of the existing unique layers or tunnels in crystal lattices and high specific surface areas, MnO 2 has been widely investigated and extensively used in adsorption, − catalysis, − oxidation, − and electrochemical capacitor material. − These reports have proven that MnO 2 is one of the outstanding candidates for the practical application in the degradation of dye wastewater in different surroundings. Birnessite-type MnO 2 , which is also denoted as δ-MnO 2 , has a two-dimensional lamellar structure with an interlayer distance of 0.71 nm and hydrated alkaline cations (Na + , K + , ...) in the interlayers that compensate the small overall negative charge .…”

Morphologically controlled synthesis of porous Mn2O3 microspheres and their catalytic applications on the degradation of methylene blue

“…Various methods, including adsorption, ion-exchange, coagulation/flocculation, membrane separation and advanced oxidation processes (AOPs) have been applied for the treatment of dye wastewaters [6,7]. Of the above-mentioned treatment techniques, AOPs are regarded as the most effective approaches to decontaminate dye wastewaters based on the generation of reactive species in the presence of catalysts, which can degrade a broad range of organic pollutants quickly and non-selectively [8] degradation of dye wastewaters due to their unique physical and chemical properties [9,10]. Among them, Mn 2 O 3 , is an inexpensive, environment friendly metal oxide, has attracted considerable attention because of its distinctive properties and extensive applications in catalysis, adsorption, ion-exchange materials, and Li-ion batteries.…”