Synthesized Silver Carbon Nanotubes and Zinc Oxide Nanoparticles and their Ability to Remove Methylene Blue Dye

Abstract

A promising rotating arc discharge method has been developed for producing high purity silver carbon nanotube and zinc oxide nanoparticles, to study their capacities for methylene blue (MB) dye removal under different conditions such as contact time, initial methylene blue dye ion concentration, solution pH, and adsorbent dose. The equilibrium isotherm data were analyzed using Langmuir, Freundlich, Temkin isotherms. Correlation coefficients indicated the following order to fit isotherms for silver carbon nanotube: Freundlich > Langmuir > Temkin. On the other hand, for zinc oxide nanoparticles, the following adjustment founded to fit isotherms was: Langmuir > Temkin> Freundlich. Furthermore, separation factors and distribution coefficients of Methylene blue (MB) dye were calculated. Adsorption kinetic data were analyzed using pseudo-first and second -orders and Elovich model. Film and intraparticle Diffusion model were used to investigate Adsorption mechanism. Kinetic studies showed that the adsorption of methylene blue onto silver carbon nanotubes followed Elovich kinetic model, and the rate of adsorption is controlled by the liquid film diffusion model. Adsorption of methylene blue on zinc oxide nanoparticles followed the pseudo-second-order kinetic model, and the rate of adsorption is controlled by the intraparticle diffusion model.

Water Treatment from MB Using Zn-Ag MWCNT Synthesized by Double Arc Discharge

“…The adsorbtion capacity of Zn, Ag MWCNT is compared with other materials prepared with the same method Ag-CNT, and ZnO NPs [ 10 ] showed that the Zn, Ag MWCNT is higher than ZnO NPs and lower than Ag-CNT. In the present work, the Ag% of Zn, Ag MWCNT reduced from 64.65% to 6.28% that present in Ag-CNT to not affect the toxicity of water.…”

“…This operation was carried out in a vessel containing 1 L of deionized water at 5.8 pH under the effect of atmospheric pressure. As demonstrated in Figure 1 where the whole system was modified from the previous work [ 10 ] by adding another feeding anode which is connected to a carbon cylindrical rotating cathode 16 mm rotated at 950 rpm in diameter and 5 cm in length.…”

“…The double arc discharge in which first arc (sampling plasma) was used to evaporate and atomize the first metal sample, while the second arc is used to excite the resultant particles to combine with the second metal nanoparticles and carbon cathode. The yield prepared its characterizations were investigated to get clear information about size, shape, crystallinity, morphology, purity, and types of bonds attached together [ 10 ]. Zn-Ag MWCNT was done in only one step without the use of catalyst precursors to avoid the chemical toxicity of nano adsorbents used in the water dye removal.…”

“…It was discovered that the AgNPs in the products act as an e-transport link between the nano-adsorbent and the MB [ 8 ]. In latest years, carbonaceous compounds have received a lot of attention for adsorption applications, because of their exact stability, structural variety, density, and appropriateness for large-scale production, the adsorption of different types of dye may be a convenient alternative for graphene [ 9 , 10 , 11 ]. Carbon nanotubes (CNTs) decorated by transition metal such as snaps can increase the activity by using the charge mediator mechanism [ 3 ].…”

“…It may appear too simple and avoid chemical toxicity, and oxidizing nanometals [ 6 ]. Many research laboratories use two electrodes of arc discharge to produce metal nanoparticles or use two different metals to produce metal-metal nanocomposite [ 10 ]. A new design for preparation, a sample was created using double arc discharge successfully produces controlled size Zn-Ag MWCNT avoiding chemical toxicity.…”