Pushing the boundaries of heavy metal adsorption: A commentary on strategies to improve adsorption efficiency and modulate process mechanisms

Dev, Vinu V.; Nair, Kripa K.; Baburaj, Gayathry; Krishnan, K. Anoop

doi:10.1016/j.colcom.2022.100626

Cited by 24 publications

(8 citation statements)

References 161 publications

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“…On the contrary, if the adsorption process is endothermic, the adsorption efficiency will be improved as temperature increases [37]. The adsorbent dose is also very significant on the adsorption performance since the amount of heavy metal ions that can be adsorbed increases with the concentration of the adsorbent material in an aqueous solution, which occurs continuously up to a certain concentration value from which it becomes constant with the concentration [38, 39]. This limit value is different for each metal ion, keeping the other parameters of the system unchanged [7, 40].…”

Section: Introductionmentioning

confidence: 99%

Heavy Metal Removal from Aqueous Effluents by TiO₂ and ZnO Nanomaterials

Lissarrague

Alshehri

Alsalhi

et al. 2023

Adsorption Science & Technology

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The presence of heavy metals in wastewater, such as Ni, Pb, Cd, V, Cr, and Cu, is a serious environmental problem. This kind of inorganic pollutant is not biodegradable for several years, and its harmful effect is cumulative. Recently, semiconductor nanomaterials based on metal oxides have gained interest due to their efficiency in the removal of heavy metals from contaminated water, by inducing photocatalytic ion reduction when they absorb light of the appropriate wavelength. The most commonly applied semiconductor oxides for these purposes are titanium oxide (TiO2), zinc oxide (ZnO), and binary nanomaterials composed of both types of oxides. The main purpose of this work is to critically analyse the existent literature concerning this topic focusing specially in the most important factors affecting the adsorption or photocatalytic capacities of this type of nanomaterials. In particular, photocatalytic activity is altered by various factors, such as proportion of polymorphs, synthesis method, surface area, concentration of defects and particle size, among others. After a survey of the actual literature, it was found that, although these metal oxides have low absorption capacity for visible light, it is possible to obtain an acceptable heavy metal reduction performance by sensitization with dyes, doping with metallic or nonmetallic atoms, introduction of defects, or the coupling of two or more semiconductors.

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Section: Introductionmentioning

confidence: 99%

Heavy Metal Removal from Aqueous Effluents by TiO₂ and ZnO Nanomaterials

Lissarrague

Alshehri

Alsalhi

et al. 2023

Adsorption Science & Technology

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“…Therefore, once Pb(II) is excluded, i.e., in the single Cd(II) system, the CFSG adsorption sites are solely available for Cd(II). It is worth mentioning that in real wastewater, the coexisting other ions (e.g., Ca 2+ , Na + , Mg 2+ ) in water would alter the adsorption process as they compete with the adsorbate over the adsorption sites …”

Section: Resultsmentioning

confidence: 99%

“…It is worth mentioning that in real wastewater, the coexisting other ions (e.g., Ca 2+ , Na + , Mg 2+ ) in water would alter the adsorption process as they compete with the adsorbate over the adsorption sites. 37 3.3.1. Effect of Contact Time.…”

Section: Resultsmentioning

confidence: 99%

Facile Preparation of Magnetic CuFe₂O₄ on Sepiolite/GO Nanocomposites for Efficient Removal of Pb(II) and Cd(II) from Aqueous Solution

Othman,

Banat,

Hasan

et al. 2023

ACS Omega

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CuFe 2 O 4 nanoparticles were synthesized and immobilized on sepiolite fibers and graphene oxide sheets, producing a CuFe 2 O 4 /sepiolite/GO (CFSG) nanocomposite via a facile single-pot method. The synthesized nanocomposite was characterized using TEM, FTIR, SEM−EDX, XRD, and TGA techniques to determine its composition, structure, and thermal stability. The adsorptive removal of Pb(II) and Cd(II) heavy metal ions from aqueous solutions was studied using the synthesized CFSG nanocomposite. Adsorption parameters such as CFSG loading, pH, contact time, and temperature were investigated. The CFGS nanocomposite showed a higher Pb(II) removal (q m = 238.1 mg/g) compared to Cd(II) (q m = 14.97 mg/g) in a Pb(II) and Cd(II) binary system. The Pb(II) and Cd(II) adsorption fitted well with the Langmuir model, followed by the pseudo-second-order model, and was found spontaneous. Adsorption thermodynamic analysis showed that the Pb(II) adsorption process was exothermic while Cd(II) adsorption was endothermic. The CuFe 2 O 4 nanoparticles on the CFSG surface could facilitate the adsorption of heavy metal ions through electrostatic interaction and complexation processes.

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“…The adsorption equilibrium of antibiotics was a time-dependent process where the adsorption rate drops as time increases. After the adsorption of antibiotics by GO, the charge shielding effect caused a decrease in the adsorption force, which resulted in a slow reaction rate at a later stage, and the reaction equilibrium could not be reached rapidly [21].…”

Section: Adsorption Dynamicsmentioning

confidence: 99%

Effect of pH on Adsorption of Tetracycline Antibiotics on Graphene Oxide

Jiang

Wang

et al. 2023

IJERPH

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Graphene oxide (GO) has good dispersibility and adsorption capacity for antibiotics adsorption, a complex process influenced by many factors. In this work, the adsorption mechanism of GO on tetracycline antibiotics at different pH was studied to address its attenuated effects on the microbial growth. The results showed that the adsorption process of GO on three antibiotics, namely, tetracycline (TC), oxytetracycline (OTC), and chlortetracycline (CTC), followed the pseudo-second-order kinetic model. The maximum adsorption capacities were observed at pH5 which were 133.0 mg/g for TC, 125.4 mg/g for OTC, and 167.0 mg/g for CTC. Furthermore, the reaction was uniform adsorption with a single layer on the surface of GO, and heating was conducive to the reaction. In the microbial growth experiment, the growth of E. coli and B. subtilis senses was optimal at pH5, which was consistent with the adsorption experiment. This study analyzed the effect of pH on the adsorption of antibiotics by GO and provided a theoretical basis for the further application of GO in various aquatic environments.

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Pushing the boundaries of heavy metal adsorption: A commentary on strategies to improve adsorption efficiency and modulate process mechanisms

Cited by 24 publications

References 161 publications

Heavy Metal Removal from Aqueous Effluents by TiO₂ and ZnO Nanomaterials

Heavy Metal Removal from Aqueous Effluents by TiO₂ and ZnO Nanomaterials

Facile Preparation of Magnetic CuFe₂O₄ on Sepiolite/GO Nanocomposites for Efficient Removal of Pb(II) and Cd(II) from Aqueous Solution

Effect of pH on Adsorption of Tetracycline Antibiotics on Graphene Oxide

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Pushing the boundaries of heavy metal adsorption: A commentary on strategies to improve adsorption efficiency and modulate process mechanisms

Cited by 24 publications

References 161 publications

Heavy Metal Removal from Aqueous Effluents by TiO2 and ZnO Nanomaterials

Heavy Metal Removal from Aqueous Effluents by TiO2 and ZnO Nanomaterials

Facile Preparation of Magnetic CuFe2O4 on Sepiolite/GO Nanocomposites for Efficient Removal of Pb(II) and Cd(II) from Aqueous Solution

Effect of pH on Adsorption of Tetracycline Antibiotics on Graphene Oxide

Contact Info

Product

Resources

About

Heavy Metal Removal from Aqueous Effluents by TiO₂ and ZnO Nanomaterials

Heavy Metal Removal from Aqueous Effluents by TiO₂ and ZnO Nanomaterials

Facile Preparation of Magnetic CuFe₂O₄ on Sepiolite/GO Nanocomposites for Efficient Removal of Pb(II) and Cd(II) from Aqueous Solution