Recent advances in alginate-based adsorbents for heavy metal retention from water: a review

Elwakeel, Khalid Z.; Ahmed, Marwan M.; Akhdhar, Abdullah; Sulaiman, Mohamed G.M.; Khan, Ziya Ahmad

doi:10.5004/dwt.2022.28834

Cited by 39 publications

(15 citation statements)

References 119 publications

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“…Furthermore, the corresponding thermodynamics parameters including Δ G 0 , Δ H 0 , and Δ S 0 are determined and summarized in Table S3. According to the results, the changes of Δ G 0 values for IIP-AM are larger than those for IIP-MAA, suggesting that the spontaneous degree of IIP-AM is smaller than that of IIP-MAA. , Moreover, Δ H 0 values of −45.94 and −27.60 kJ/mol for IIP-AM and IIP-MAA, respectively, reveal that the adsorption of La(III) is an exothermic process, also being well consistent with the experimental results (i.e., the descending adsorption capacity with the increasing ambient temperature). , In addition, the negative values of Δ S 0 indicate a decrease of the freedom degree at the liquid–solid interfaces. , …”

Section: Resultssupporting

confidence: 84%

“…3,26 Moreover, ΔH 0 values of −45.94 and −27.60 kJ/mol for IIP-AM and IIP-MAA, respectively, reveal that the adsorption of La(III) is an exothermic process, also being well consistent with the experimental results (i.e., the descending adsorption capacity with the increasing ambient temperature). 40,41 In addition, the negative values of ΔS 0 indicate a decrease of the freedom degree at the liquid−solid interfaces. 42,43 Besides, stripping and reusable performance are significant for the adsorbent in practical applications.…”

Section: ■ Introductionmentioning

confidence: 99%

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Enhanced Selective Adsorption of Lanthanum(III) by Dual-Site Polymeric Ion-Imprinted Nanoparticles from Aqueous Media

Zhang

Liu

Guo

et al. 2023

ACS Appl. Polym. Mater.

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Selective recognition and separation of rare-earth elements (REEs) is considered a real challenge for the RE industry. In this work, two dual-site ion-imprinted polymers (IIP-AM and IIP-MAA) were synthesized via a radical copolymerization method for the removal of La(III) from aqueous solutions. The structures of samples were characterized and confirmed with various kinds of techniques, including IR, X-ray diffraction, field emission scanning electron microscopy, Brunauer–Emmett–Teller, thermogravimetry analysis, and X-ray photoelectron spectroscopy (XPS). Adsorption studies reveal that the pseudo-second-order kinetic model and the Langmuir isotherm model were well-fitted with the adsorption of La(III), showing high adsorption capacities of 45.65 and 50.05 mg/g for IIP-AM and IIP-MAA, respectively, after 120 min at pH = 5.5 and 25 °C. Impressively, the fabricated IIPs possess remarkable selectivity between La(III) and other REEs, as well as excellent reusability after five successive adsorption–regeneration cycles with less than 9% reduction of capacities. The adsorption mechanism indicates that the surface complexation and electrostatic attraction contribute to the adsorption of La(III) based on the characterization analysis of XPS, elemental mapping, and energy-dispersive spectrometry, as well as density functional theory calculations. Accordingly, these samples with tailored ion-imprinted cavities and abundant active O sites entirely exhibit the potentials for the selective recovery of REEs from aqueous solutions.

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Section: Resultssupporting

confidence: 84%

Section: ■ Introductionmentioning

confidence: 99%

Enhanced Selective Adsorption of Lanthanum(III) by Dual-Site Polymeric Ion-Imprinted Nanoparticles from Aqueous Media

Zhang

Liu

Guo

et al. 2023

ACS Appl. Polym. Mater.

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“…Recently, a variety of efforts have been devoted to the separation of REEs, such as liquid–liquid extraction, precipitation, membrane separation, and adsorption. Among them, adsorption is widely regarded as one of the most efficient and facile ways. − However, many problems still exist, including the low sorption capacity, sluggish sorption kinetics, and dissatisfied separation selectivity. Therefore, design and manufacture of the effective, stable, low-cost, and environmentally friendly adsorbents for REE capture is necessary but challenging.…”

Section: Introductionmentioning

confidence: 99%

Tuning the Dual Active Sites of Functionalized UiO-66 for Selective Adsorption of Yb(III)

Zhang

Guo

Liu

et al. 2023

ACS Appl. Mater. Interfaces

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The recovery of rare earth elements (REEs) from discharged electronic devices or mineral waste water is highly essential but still facing challenges. In this work, two amino-functionalized carboxyl-UiO-66 (UiO-66-COOH-TETA and UiO-66-(COOH) 2 -ED) prepared via the postmodification method were employed as the adsorbents for Yb(III) capture. The experimental results revealed their superior adsorption capacities of 161.5 and 202.6 mg/g, respectively. Meanwhile, their adsorption processes can be described by the pseudosecond-order kinetic model and Langmuir model. Effects of initial pH and temperature on adsorptions were systematically evaluated, affording an optimal operating condition (i.e., pH of 5.5−6, T of 65 °C, t of 10 h). Moreover, the fabricated materials exhibited great reusability after five adsorption−regeneration cycles. UiO-66-COOH-TETA demonstrated good separation selectivity for Yb(III) over light REEs (i.e., 3.98 of Yb/ Ce, 3.51 of Yb/Nd). Based on the density functional theory calculations and characterization analysis (XPS, Zeta, mapping, and IR), the adsorption mechanisms were mainly attributed to significant electrostatic attraction and strong surface complexation between N and O sites and Yb(III).

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“…Various methods such as chemical extraction, bio-leaching, adsorption, and bioremediation have been applied for the removal of HMs from the tannery sludge and other waste such as tailing leachate. [8][9][10][11][12] However, such methods are tedious and time-consuming and it has been observed that they are difficult to control for removal efficiency in the actual operation. Immobilization, in this regard, is a promising technique for treating heavy metal-contaminated sludge and soil and thus reducing the HMs toxicity in the environment.…”

Section: Introductionmentioning

confidence: 99%

Immobilization of heavy metals in tannery sludge by the formation of tobermorite in subcritical water treatment with rice husk silica

et al. 2023

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Recent advances in alginate-based adsorbents for heavy metal retention from water: a review

Cited by 39 publications

References 119 publications

Enhanced Selective Adsorption of Lanthanum(III) by Dual-Site Polymeric Ion-Imprinted Nanoparticles from Aqueous Media

Enhanced Selective Adsorption of Lanthanum(III) by Dual-Site Polymeric Ion-Imprinted Nanoparticles from Aqueous Media

Tuning the Dual Active Sites of Functionalized UiO-66 for Selective Adsorption of Yb(III)

Immobilization of heavy metals in tannery sludge by the formation of tobermorite in subcritical water treatment with rice husk silica

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