Synthesis of magnetically separable and recyclable magnetic nanoparticles decorated with β-cyclodextrin functionalized graphene oxide an excellent adsorption of As(V)/(III)

Kumar, A. Santhana Krishna; Jiang, Shiuh‐Jen

doi:10.1016/j.molliq.2017.04.093

Cited by 74 publications

(17 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[65]. The possible reason is that the adsorbent surface could be negatively charged above pH 4.8 [66]. Irrespective of the charge on the surface of GOMs, the As(V) adsorption can increase in acidic pH, as has been well reported in earlier studies.…”

Section: Structure Analysis Of Crosslinked Gomsmentioning

confidence: 54%

“…Irrespective of the charge on the surface of GOMs, the As(V) adsorption can increase in acidic pH, as has been well reported in earlier studies. The anionic arsenic species (H 2 AsO − 4 or HAsO 2− 4 ) can be adsorbed onto the positively charged adsorbent (GO-OH + 2 , GOCOOH + 2 ) by electrostatic attraction [66,67]. Adsorption capacity As(V) begins to decrease in alkaline (pH = 10) due to the high density of hydroxyl (OH − ) ion.…”

Section: Structure Analysis Of Crosslinked Gomsmentioning

confidence: 99%

See 1 more Smart Citation

Triethylenetetramine/hydroxyethyl cellulose-functionalized graphene oxide monoliths for the removal of copper and arsenate ions

Jin

Easton

Yin

et al. 2018

Science and Technology of Advanced Materials

View full text Add to dashboard Cite

Nitrogen-doped graphene oxide monoliths (GOMs) were readily constructed by crosslinking graphene oxide (GO) using triethylenetetramine (TETA) and hydroxyethyl cellulose (HEC). The addition of HEC was beneficial to the formation of a network structure compared to that in the absence of HEC. The generated monoliths have shown various morphologies with different d spacing, layer thickness, and micropore size. Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) analyses provided evidences for the formation of covalent C-N bonds and some nitrogen-containing heterocyclic composition inside the graphene oxide sheet, indicating that the interaction of GO with the amine crosslinker involved the crosslinking reaction between GO epoxides and amine groups. HEC was also involved in the N-doping reaction via the partial reduction of oxygen in HEC molecules. Analysis of X-ray diffraction (XRD) results indicated that the lattice distance between GO sheets increased after TETA/HEC crosslinking. Thermogravimetric analysis (TGA) confirmed the successful incorporation of crosslinker moieties on the surface of GO sheets. The fabricated GOMs could be used to efficiently adsorb metal ions and arsenate by the introduced polar functional groups on GO sheets and porous structures based on hydrogen bonds, whose morphologies and compositions were confirmed via XRD, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS).

show abstract

Section: Structure Analysis Of Crosslinked Gomsmentioning

confidence: 54%

Section: Structure Analysis Of Crosslinked Gomsmentioning

confidence: 99%

Triethylenetetramine/hydroxyethyl cellulose-functionalized graphene oxide monoliths for the removal of copper and arsenate ions

Jin

Easton

Yin

et al. 2018

Science and Technology of Advanced Materials

View full text Add to dashboard Cite

show abstract

“…As shown in the insets of Figure 9 ture allowed ranking them as superparamagnetic. 49 The lower range of magnetization (emu g −1 ) for the Ag/ CuFe 2 O 4 /rGO can be related to the decrease of CuFe 2 O 4 content due to the presence of non-magnetic components As shown in Figure S1 The study of the reaction mechanism helps to design a catalyst with better output. Figure S2 shows the catalytic mechanism of 4-NP reduction by the Ag/CuFe 2 O 4 /rGO nanocomposite in the presence of NaBH 4 .…”

Section: Catalytic Reduction Of Nitroarenes Over the Ag/cufe 2 O 4mentioning

confidence: 99%

Magnetically Separable Ag/CuFe2O4 /Reduced Graphene Oxide Ternary Nanocomposite with High Performance for the Removal of Nitrophenols and Dye Pollutants from Aqueous Media

Nirumand¹,

Farhadi²,

Zabardasti³

2018

ACSi

View full text Add to dashboard Cite

In this work, a novel ternary magnetic nanocomposite namely Ag/CuFe 2 O 4 /rGO was produced by a facile solvothermal route. The reduction of graphene oxide (GO) to reduced form (rGO) and the in-situ deposition of CuFe 2 O 4 and Ag nanoparticles on rGO occurred simultaneously in a one-pot reaction. The structure, composition and morphology of the as-prepared nanocomposite were characterized by FT-IR, XRD, VSM, FESEM, EDX, TEM, and BET analyses. The results indicated that the Ag and CuFe 2 O 4 nanoparticles were successfully loaded on the surface of rGO. The catalytic performance of the Ag/CuFe 2 O 4 /rGO nanocomposite was evaluated for the reduction of nitroarenes to corresponding amines in the presence of sodium borohydride (NaBH 4) as a reducing agent. The nanocomposite exhibited the high performance in the reduction of the reduction of nitroarenes with 100% conversion within 10-30 min. The catalytic activity of the Ag/CuFe 2 O 4 /rGO was enhanced compared with Ag/CuFe 2 O 4 , Ag/rGO and CuFe 2 O 4 /rGO samples due to easier electron transfer process. Furthermore, the adsorption data revealed that cationic methylene blue (MB) dye could be removed almost completely on the Ag/CuFe 2 O 4 /rGO composite within 2 min and the composite could also selectively adsorb MB from the mixed solution with anionic methyl orange (MO). Due to the existence of magnetic CuFe 2 O 4 nanoparticles, the Ag/CuFe 2 O 4 /rGO nanocomposite can be magnetically separated and reused without any change in structure and performance.

show abstract

“…The pH of a solution plays an important role in the adsorption process and can radically change the existing speciation of an adsorbate and surface charge of an adsorbent [19]. In the present study, the effect of pH was tested under a temperature of 25 • C, an initial Cu(II) concentration of 25 mg·L −1 , a reaction time of 360 min, and dosages of Cu SS and Cu MS of 20 g·L −1 and 5 g·L −1 respectively, depending on their adsorption capacity.…”

Section: Effect Of Ph On Adsorptionmentioning

confidence: 99%

Characterization of the Adsorption of Cu (II) from Aqueous Solutions onto Pyrolytic Sludge-Derived Adsorbents

Wang

Chen

Yan

et al. 2018

Water

View full text Add to dashboard Cite

The adsorption of Cu (II) onto two typical types of pyrolytic sludge was investigated in this study. The examined conditions include pH, adsorption time, and temperature, as well as the dosage of adsorbents. Results show that the adsorbents removed the Cu (II) effectively. The adsorbent made from pyrolyzed paper mill sludge (Cu MS ) exhibited exceptional performance, with a removal efficiency of around 100%. Moreover, the adsorption of Cu (II) onto Cu MS was not affected by pH in the range of 3-9. The kinetic data showed better conformation with the pseudo-second-order kinetic model, and the adsorption processes of the Cu MS fit well to the Langmuir isotherm model. The adsorption capacity reached 4.90 mg·g −1 under appropriate conditions. Microscopic analysis and FT-IR analysis revealed that the adsorbent with porous structure and high monosilicate content was beneficial to Cu (II) adsorption. Thus, the Cu MS is a potentially promising candidate for retaining Cu (II) in aqueous environments.

show abstract

Synthesis of magnetically separable and recyclable magnetic nanoparticles decorated with β-cyclodextrin functionalized graphene oxide an excellent adsorption of As(V)/(III)

Cited by 74 publications

References 31 publications

Triethylenetetramine/hydroxyethyl cellulose-functionalized graphene oxide monoliths for the removal of copper and arsenate ions

Triethylenetetramine/hydroxyethyl cellulose-functionalized graphene oxide monoliths for the removal of copper and arsenate ions

Magnetically Separable Ag/CuFe2O4 /Reduced Graphene Oxide Ternary Nanocomposite with High Performance for the Removal of Nitrophenols and Dye Pollutants from Aqueous Media

Characterization of the Adsorption of Cu (II) from Aqueous Solutions onto Pyrolytic Sludge-Derived Adsorbents

Contact Info

Product

Resources

About