Removal of Methylene Blue from aqueous solution by Fe3O4@Ag/SiO2 nanospheres: Synthesis, characterization and adsorption performance

Fe3O4@C particles synthesized with iron‐containing water treatment residuals and its potential for methylene blue removal

“…As the pH values went down, the performance for MB removal was reduced, for the surface of the sample presented positive while the pH < pH pzc . Similar findings were reported by other researchers . So the earlier‐mentioned results showed that the sample had a good affinity to MB ions through a broad range of pH from 5 to 12 (removal rate percent > 78), which was highly advantageous for practical operation.…”

“…S2). The difference of pH pzc in these two solutions might be due to the fact that the as‐prepared sample surface charge decreased after the sorption of MB ions, and the finding was very similar to the results obtained by Saini et al . Next, it could be seen that there was a small shift on MB removal under the condition of the pH range from 7 to 12, the MB removal rate's changing only from 87.17% to 88.21%.…”

“…S2). The difference of pH pzc in these two solutions might be due to the fact that the as-prepared sample surface charge decreased after the sorption of MB ions, and the finding was very similar to the results obtained by Saini et al 33 Next, it could be seen that there was a small shift on MB removal under the condition of the pH range from 7 to 12, the MB removal rate's wileyonlinelibrary.com/jctb changing only from 87.17% to 88.21%. However, the effect on the adsorption of MB was non-negligible under low pH value (pH < 5), and an evident and sharp drop could be seen when seeing the MB removal rate's shift from initial pH 5.13 to initial pH 2.15, exhibiting the adsorption removal efficiency severe decline from 78.92% at initial pH 5.13, dramatically, to the 19.25% at initial pH 2.15.…”

“…Similar findings were reported by other researchers. 33,35 So the earlier-mentioned results showed that the sample had a good affinity to MB ions through a broad range of pH from 5 to 12 (removal rate percent > 78), which was highly advantageous for practical operation. And therefore, in the meanwhile, the adsorption performance of this sample was representative enough when MB solution was adjusted to neutral (pH was about 7.0) in the next experiments.…”

Synthesis of novel low‐cost porous gangue microsphere/geopolymer composites and their adsorption properties for dyes

“…It is a popular way but expensive . Fe 3 O 4 @Ag/SiO 2 nanospheres were also synthesized to adsorb MB, showing the maximum monolayer adsorption capacity of 128.5 mg/g . MnO 2 nanosheets on montmorillonite were reported to adsorb MB with high adsorption capacity of 363.63 mg/g .…”