Simultaneous adsorption and dechlorination of 2,4-dichlorophenol by Pd/Fe nanoparticles with multi-walled carbon nanotube support

Preparation of functionalized Pd/Fe-Fe3O4@MWCNTs nanomaterials for aqueous 2,4-dichlorophenol removal: Interactions, influence factors, and kinetics

“…However, the real concentration of dechlorinated products could not be directly determined by the liquid concentration due to the difference of adsorption capacity onto the nanohybrids. The percentage of the dechlorinated products could be estimated by the liquid concentration according to the Freundlich isotherm model, which fitted best with experimental data in our previous study [28,45]. As shown in Fig.…”

“…MWCNTs was proved to be a good supporter of Pd/Fe and Fe3O4 nanoparticles as observed in TEM images, which also achieved better 2,4-DCP dechlorination than carbon fibers or activated carbon supported Pd/Fe nanoparticles in our previous study [28]. Besides, magnetic nanoscale Fe3O4 particles were incorporated into the Pd/Fe@MWCNTs nanohybrids to improve the retrievability, which was assessed by magnetic separation experiments (Fig.…”

“…Subsequently, 2,4-DCP was gradually dechlorinated by Pd/Fe nanoparticles [7], and the removal efficiency was only 35.8% after 5 h. However, in the magnetic MWCNTs supported Pd/Fe nanohybrids system (Pd/Fe-Fe3O4@MWCNTs), simultaneous satisfactory adsorption and enhanced dechlorination of 2,4-DCP were obviously observed. More than half of 2,4-DCP (55.9%) was quickly removed within 2 min due to the adsorption by MWCNTs, which had many oxygen-containing functional groups (−COOH, −OH), and the detailed adsorption behavior between functional groups and contaminants been discussed in our previous studies [28,29]. Then the removal efficiency reached to 92.3% after 5 h, which was much higher than Pd/Fe@MWCNTs (66.3%).…”

“…The 2,4-DCP dechlorination data was fitted by the pseudo-first-order kinetics, which is often used to describe dehalogenation [28,39]. 1 …”

Adsorption Behavior of Magnetic Multiwalled Carbon Nanotubes for the Simultaneous Adsorption of Furazolidone and Cu(II) from Aqueous Solutions

“…However, there are still a small amount of Cu 2+ in the aqueous solution at pH = 6.0, copper (II) may complex with the hydroxyl and/or carbonyl group on the surface of magnetic MWCNTs, and even form some coordinate bonds between Cu(II) and oxygen-containing functional groups. These hydration shells on the surface of magnetic MWCNTs will indirectly compete with FZD for sorption sites by the effects of squeezing, shielding, and occupying (Xu et al, 2012), thus leading to a competitive adsorption phenomenon. In addition, for FZD preloading experiments, it can be found that if the concentration of Cu(II) was becoming higher, more FZD would be desorbed, which confirmed again that Cu(II) can compete the same adsorption sites with FZD.…”