Magnetic Multiwall Carbon Nanotube Decorated with Novel Functionalities: Synthesis and Application as Adsorbents for Lead Removal from Aqueous Medium

Abstract

Water pollution is one of the major challenges facing modern society because of industrial development and urban growth. This study is directed towards assessing the use of multiwall carbon nanotube, after derivatization and magnetization, as a new and renewable absorbent, to remove toxic metal ions from waste streams. The adsorbents were prepared by, first oxidation of multiwall carbon nanotube, then derivatizing the oxidized product with hydroxyl amine, hydrazine and amino acid. The adsorbents were characterized by various techniques. The adsorption efficiency of the multiwall carbon nanotube adsorbents toward Pb(II) was investigated. The effect of adsorbent’s dose, temperature, pH, and time on the adsorption efficiency were studied and the adsorption parameters that gave the highest efficiency were determined. The derivatives have unique coordination sites that included amine, hydroxyl, and carboxyl groups, which are excellent chelating agents for metal ions. The thermodynamic and kinetic results analysis results indicated spontaneous adsorption of Pb(II) by the multiwall carbon nanotube adsorbents at room temperature. The adsorption process followed pseudo-second-order and Langmuir isotherm model. The adsorbents were regenerated using 0.1 N HCl.

Eco-Friendly Synthesis and Characterization of Double-Crossed Link 3D Graphene Oxide Functionalized With Chitosan for Adsorption of Sulfamethazine From Aqueous Solution: Experimental and DFT Calculations

“…The kinetics and mechanism of SMZ adsorption on 3D GF-CS have been studied using pseudo-first-order and pseudo-secondorder models (Hanbali et al, 2020a;Hanbali et al, 2020b). In separate 250-ml Erlenmeyer flasks, 50 ml of different beginning SMZ concentrations (50,100,200,300, and 400 mgL −1 ) were created; then, specified adsorbate masses were added and incubated for 20 min at 25 °C and 200 rpm.…”

Functionalized MoO3 Nanosheets for High‐Efficiency RhB Removal

“…The results indicate that the competitive adsorption between the other cationic ions existing in tap water and RhB on F‐MoO 3 nanosheets led to the reduction of the adsorption capacity. [ 61 ] Although the adsorption performance decreased in the stimulated real water, the adsorption capacity (416 mg g −1 , RhB/F‐MoO 3 nanosheets) is still much higher than other currently reported MoO 3 materials (Table 1), showing great potential in industrial dye removal.…”

“…Meanwhile, the adsorption capacity of RhB on F‐MoO 3 nanosheets decreased in real water, due to the negatively charged active binding sites being partly occupied by the other cationic ions in tap water. [ 61 ] Besides, the anionic dye (reactive black 5) was tested to verify if the RhB dye was adsorbed on F‐MoO 3 nanosheets via electrostatic attractions. As shown in Figure S8 (Supporting Information), the concentration of the solution barely decreased after the adsorption, demonstrating that the negatively charged F‐MoO 3 nanosheets can hardly adsorb anionic dyes.…”

Removing of Anionic Dye from Aqueous Solutions by Adsorption Using of Multiwalled Carbon Nanotubes and Poly (Acrylonitrile-styrene) Impregnated with Activated Carbon

“…Furthermore, the results of the BET surface area examination of MWCNTs show that the whole surface area was observed to be 180.89 m 2 g −1 . It was shown that the MWCNTs have a greater specific surface area than that distinguished by Hanbali et al [37]. The specific surface area of MWCNTs is affected by their agglomeration, attendance of impurities, diameter, surface functionalization, etc.…”