Preparation, characterization, and methylene blue dye adsorption study of silk fibroin–graphene oxide nanocomposites

Abstract

In the current study, an attempt was made to fabricate the silk fibroin/graphene oxide (SF/GO) blend films. Obtained blend films were characterised by UV-visible spectroscopy (UV-Vis) confirmed the GO blending...

Coconut power: a sustainable approach for the removal of Cr6+ ions using a new coconut-based polyurethane foam/activated carbon composite in a fixed-bed column

“…Furthermore, the analysis has also revealed a signicant increase in the surface roughness of PUAC with the addition of AC particles. 1,28,39,40 This implies a strong interaction between PU and AC, which corroborates the potential of the material for effective heavy metal ion adsorption.…”

“…A study conducted by the Global Burden of Diseases (GBD) in the same year shows that unsafe water source ranks 15th in the causes and risk factors for death and diseases, responsible for about 1.23 million annual deaths worldwide, and approximately 5507 annual deaths in the Philippines. Excessive release of pollutants such as toxic metal ions, 3 dye effluents, 1 and excessive use of pesticides and inorganic fertilizers 4 into waterways from various industries contributes signicantly to pollution and poses an imminent threat to living organisms. 1 Heavy metals are metals with high densities and are toxic even at low concentrations.…”

“…Excessive release of pollutants such as toxic metal ions, 3 dye effluents, 1 and excessive use of pesticides and inorganic fertilizers 4 into waterways from various industries contributes signicantly to pollution and poses an imminent threat to living organisms. 1 Heavy metals are metals with high densities and are toxic even at low concentrations. These pollutants enter various ecosystems through different natural and anthropogenic activities.…”

Chitosan-Functionalized-Graphene Oxide (GO@CS) Beads as an Effective Adsorbent to Remove Cationic Dye from Wastewater

“…The results shows that the %R of MB over GO@CS composite beads was reduced from 99.99–39.3% with a further increase in the MB-dye concentrations from 10 to 50 mg/L. This observation is attributed to the supposition that, at low MB-dye concentration, the number of MB-dye species will be equivalent to the number of the binding sites on the surface of GO@CS composite beads [ 28 ]. With increased dye concentration, the number of dye species in the aqueous solution increase compared with the number of the binding site, leading to reduced adsorption performance [ 29 ].…”

A Novel P@SiO2 Nano-Composite as Effective Adsorbent to Remove Methylene Blue Dye from Aqueous Media

“…The effect of the initial MB dye concentrations on the removal percent (%R) and the equilibrium adsorption amount of the MB dye by P@SiO 2 nanocomposite from an aqueous solution was investigated (as in Figure 3 c) using initial MB dye concentrations ranging from 100 to 300 mg L − 1 at adsorbent dose = 25 mg/10 mL, pH = 7, and T = 25 °C. It was observed that the %R increased with the time of the initial concentration to 100 s. After that, the equilibrium state was reached, as shown in Figure 2 c. Moreover, the adsorption capacity of MB dye (q e ) increases with a further increase in the initial dye concentration in the range (100–300 mg L − 1 ), as presented in Figure 3 d. The reason for this may refer to the increase in the MB dye concentrations causing improvement in the concentration gradient’s driving force, which accelerates the MB dye species’ diffusion velocity into the P@SiO 2 nanocomposite adsorbent particles [ 44 ]. Then, the concentration gradient reduces due to the adsorption of MB molecules on the active sites of the P@SiO 2 nanocomposite.…”