Graphene oxide–bismuth tungstate (GO–Bi2WO6) nanocomposite as a green adsorbent for lead removal: isotherm, kinetics and thermodynamic study

Saadati, T.; Eftekhari, M.; Rezazadeh, N.; Nazarabad, M. K.

doi:10.1007/s13762-022-04627-5

Cited by 11 publications

(2 citation statements)

References 37 publications

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“…All in all, it is expected that in acidic pH (level І, pH = 3.0), the RP of Pb 2+ decreases due to the large amount of H + ions competing with Pb 2+ ions, which occupy the adsorption sites of NiCo‐LDHs‐rGO and hinder the dissociation of carboxylic acid for electrostatically interacting with Pb 2+ ions. [ 36–43 ] According to Figure 7, it is observed that when all effective factors are at the first level (black line in Figure 7), the RP almost reaches 50% (in the best situation). This is despite the fact that in the optimal state it can reach over 95% (red line in Figure 7).…”

Section: Resultsmentioning

confidence: 99%

One‐step hydrothermal synthesis of a green NiCo‐LDHs‐rGO composite for the treatment of lead ion in aqueous solutions

Makarem,

Aldaghi,

Gheibi

et al. 2023

Can J Chem Eng

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Herein, we have synthesized a microspherical nickel‐cobalt‐layered double hydroxides‐reduced graphene oxide composite (NiCo‐LDHs‐rGO) through a one‐step hydrothermal method and then used it as an adsorbent for the removal of Pb2+ from aqueous solutions. Fourier transform infrared spectrophotometry (FT‐IR), field emission scanning electron microscopy (FESEM), mapping elemental analysis, electron dispersive x‐ray spectroscopy (EDX), x‐ray diffraction analysis (XRD), and the Brunauer–Emmett–Teller (BET) method were used for the characterization of the adsorbent. Factors affecting the adsorption of Pb2+ ion such as solution pH, adsorbent dosage, contact time, competing ion, and regeneration were investigated in batch mode by the NiCo‐LDHs‐rGO. Under optimized conditions based on the Taguchi method (pH = 5.0, adsorbent dosage = 20 mg, and contact time = 30 min), the highest removal percentage was found to be 99.7% for 100 mg L−1 of Pb2+. According to the results, NiCo‐LDHs‐rGO exhibited a high preference for Pb2+ over Cu2+, Zn2+, and Cd2+. This adsorbent was regenerated for several cycles (using 0.01 M HCl) with no significant deterioration in performance. Analyses of the adsorption isotherm models revealed that the adsorption of Pb2+ follows Freundlich isotherm with a maximum adsorption capacity of 200 mg g−1. Also, the kinetic data confirmed that pseudo second order kinetic equation is the best model for predicting the kinetics. Furthermore, the Simulink modelling illustrated that the adsorption kinetics of Pb2+ onto NiCo‐LDHs‐rGO is done with high accuracy in a continuous stirred‐tank reactor. Finally, dual interactions of the effective parameters can be modelled by polynomial equations in MATLAB, and according to the Taguchi model, pH is clearly the most important feature among all effective parameters.

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Section: Resultsmentioning

confidence: 99%

One‐step hydrothermal synthesis of a green NiCo‐LDHs‐rGO composite for the treatment of lead ion in aqueous solutions

Makarem,

Aldaghi,

Gheibi

et al. 2023

Can J Chem Eng

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“…Their results demonstrated that Rb(I) and Cs(I) possessed maximum adsorption capacities of 0.78 and 0.85 mmol g −1 , respectively. The removal of Pb(II) from aqueous solution by using graphene oxide–bismuth tungstate (GO–Bi 2 WO 6 ) nanocomposite has been evaluated by Saadati et al ( 2023 ). They declared that Pb(II) has a high adsorption capacity of 128.0 mg g −1 .…”

Section: Introductionmentioning

confidence: 99%

Adsorption behavior of Mo(VI) from aqueous solutions using tungstate-modified magnetic nanoparticle

Abu Elgoud,

Abd-Elhamid,

Aly

2024

Environ Sci Pollut Res

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A new magnetic nanoparticle modified with sodium tungstate (Mnp-Si-W) was synthesized and employed for the sorption of molybdenum from aqueous solutions. The prepared nanoparticles (Mnp-Si-W) were characterized by different advanced techniques. Different parameters that influenced the adsorption percent of Mo(VI) were investigated using a batch process. Based on a systematic investigation of the adsorption isotherms and kinetics models, Mo(VI) adsorption follows the Langmuir model and pseudo-second-order kinetics. According to the Langmuir isotherm model, the Mnp-Si-W nanoparticles exhibited a maximum adsorption capacity of 182.03 mg g−1 for Mo(VI) at pH 2.0. The effect of competing ions showed that the prepared nanoparticles have a high selectivity for the sorption of molybdenum. Moreover, the effect of some interfering anions on Mo(VI) ion sorption is found in the following order: phosphate < sulfate < chromate. Finally, the nanoparticle (Mnp-Si-W) can be successfully reused five times.

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Modelling and optimising the performance of graphene oxide-Cu2SnS3-polyaniline nanocomposite as an adsorbent for mercury ion removal

Enferadi,

Eftekhari,

Gheibi

et al. 2024

Environ Sci Pollut Res

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Graphene oxide–bismuth tungstate (GO–Bi2WO6) nanocomposite as a green adsorbent for lead removal: isotherm, kinetics and thermodynamic study

Cited by 11 publications

References 37 publications

One‐step hydrothermal synthesis of a green NiCo‐LDHs‐rGO composite for the treatment of lead ion in aqueous solutions

One‐step hydrothermal synthesis of a green NiCo‐LDHs‐rGO composite for the treatment of lead ion in aqueous solutions

Adsorption behavior of Mo(VI) from aqueous solutions using tungstate-modified magnetic nanoparticle

Modelling and optimising the performance of graphene oxide-Cu2SnS3-polyaniline nanocomposite as an adsorbent for mercury ion removal

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