Recovery of cadmium, lead and nickel from leach solutions of waste electrical and electronic equipment using activated carbon modified with 1-(2-pyridylazo)-2-naphthol

Iqbal, Aamir; Jan, M. Rasul; Shah, Jasmin

doi:10.1016/j.hydromet.2021.105570

Cited by 8 publications

(17 citation statements)

References 36 publications

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“…In the authors’ opinion, harsh conditions can provide information on ion-sorbent interaction strength that is useful enough to satisfy both landfill and recovery applications. Moreover, low pH is reported as the best condition to promote quantitative desorption [ 8 , 41 ].…”

Section: Discussionmentioning

confidence: 99%

“…More conventional treatment methods (i.e., chemical precipitation, flotation, ion exchange, coagulation/flocculation, adsorption, and electrochemical removal) are already in use, while other unconventional ones (i.e., ultrafiltration, nanofiltration or reverse osmosis) [ 1 , 2 ], have been more recently proposed and implemented in the practice, as reported by D. Fila et al, A. Iqbal et al, and V. Kumar et al [ 7 , 8 , 9 ]. However, despite several good efforts on the development of cheap and efficient technologies, in our opinion, there is not a unique solution to the problem.…”

Section: Introductionmentioning

confidence: 99%

“…To the best authors’ knowledge, no studies considering such sorbents systems and solution composition have been reported in the literature. Furthermore, different sorbents’ nature, modifiers, solutions concentration and compositions have been reported and studied [ 9 , 18 , 20 , 28 , 32 , 38 , 39 ] Moreover, few papers reported mixed La-Ni solutions [ 15 ] or assessed both capture and release mechanisms [ 8 , 40 , 41 ].…”

Section: Introductionmentioning

confidence: 99%

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Capture and Release Mechanism of Ni and La Ions via Solid/Liquid Process: Use of Polymer-Modified Clay and Activated Carbons

Cristiani

Bellotto²,

Dotelli

et al. 2022

Polymers

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This study is a starting point for the development of an efficient method for rare earths (REs) and transition metals (TMs) recovery from waste electrical and electronic equipment (WEEE) via a hydrometallurgical process. The capture and release capability of mineral clays (STx) and activated carbons (AC), pristine and modified (STx-L6 and AC-L6) with a linear penta-ethylene-hexamine (L6), towards solutions representative of the process, are assessed in the lab-scale. The solids were contacted with synthetic mono- and bi-ionic solutions containing Ni(II) and La(III) in a liquid/solid adsorption process. Contacting experiments were carried out at room temperature for 90 min by fixing a La concentration at 19 mM and varying the Ni one in the range of 19–100 mM. The four solids were able to capture Ni(II) and La(III), both in single- and bi-ionic solutions; however, the presence of the polyamine always results in a large improvement in the capture capability of the pristine sorbents. For all the four solids, capture behaviour is ascribable to an adsorption or ion-sorbent interaction process, because no formation of aquo- and hydroxy-Ni or La can be formed. The polyamine, able to capture Ni ions via coordination, allowed to differentiate ion capture behaviour, thus bypassing the direct competition between Ni and La ions for the capture sites found in the pristine solids. Release values in the 30–100% range were found upon one-step treatment with concentrated HNO3 solution. However, also, in this case, different metals recovery was found depending on both the sorbent and the ions, suggesting a possible selective recovery.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Capture and Release Mechanism of Ni and La Ions via Solid/Liquid Process: Use of Polymer-Modified Clay and Activated Carbons

Cristiani

Bellotto²,

Dotelli

et al. 2022

Polymers

View full text Add to dashboard Cite

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“…The binding sites with maximum binding strengths at equilibrium concentration are occupied first in the adsorption process. The linear form of the Freundlich isotherm model is given in Eqn (10) 28 :…”

Section: Effect Of Concentration and Adsorption Equilibriummentioning

confidence: 99%

Biopolymer magnetic chitosan–graphene oxide composite for removal and extraction of aromatic amines from aqueous samples

Zeb

Shah

Jan

2022

J of Chemical Tech & Biotech

Self Cite

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BACKGROUND Magnetic chitosan was crosslinked with graphene oxide and a magnetic chitosan–graphene oxide composite was synthesized and characterized. The composite was used for the removal and extraction of aromatic amines like aniline, N,N‐dimethylaniline and N,N‐diethylaniline. RESULTS Experimental factors affecting the adsorption process such as solution pH, time of contact, amount of adsorbent, initial concentration of analyte and temperature of solution were studied. The maximum adsorption capacity was found to be 7.55 mg g−1 for aniline, 6.96 mg g−1 for N,N‐dimethylaniline and 6.86 mg g−1 for N,N‐diethylaniline using pH 7 at room temperature. Kinetic and adsorption isotherm models were applied to the data which showed the best fit of experimental data to pseudo‐second‐order kinetic model and Langmuir isotherm for all three analytes. CONCLUSIONS The adsorption process was found to be spontaneous and exothermic as revealed by thermodynamic study. The maximum recoveries for aniline, N,N‐dimethylaniline and N,N‐diethylaniline were 98.56%, 97.05% and 95.26%, respectively. Successful application of the adsorbent was found for spiked aqueous samples. © 2022 Society of Chemical Industry (SCI).

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“… 12 Owing to its well-developed pore structure, high specific surface area, high adsorption capacity, low cost, nontoxicity, and high stability, activated carbon is an excellent adsorbent for removing heavy metal pollutants from wastewater. 13 …”

Section: Introductionmentioning

confidence: 99%

Contributions of Various Cd(II) Adsorption Mechanisms by Phragmites australis-Activated Carbon Modified with Mannitol

et al. 2022

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Due to its high toxicity, persistence, and bioaccumulation in the food chain, controlling cadmium (Cd) pollution in wastewater is urgent. Activated carbon is a popular material for removing Cd. To improve the Cd(II) adsorption efficiency by increasing the number of oxygen-containing functional groups, Phragmites australis -activated carbon (PAAC) was modified with mannitol at a low temperature (150 °C). The textural and chemical characteristics of PAAC and modified PAAC (M-PAAC) were analyzed by surface area analysis, elemental analysis, Boehm’s titration, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Batch adsorption experiments were conducted to investigate the influence of Cd(II) concentration, contact time, ionic strength, and pH on Cd(II) adsorption. The main adsorption mechanisms of Cd(II) on activated carbon were quantitatively calculated. The results showed that mannitol modification slightly decreased the S BET (5.30% of PAAC) and increased the content of carboxyl, lactone, and phenolic groups (total increase of 43.96% with PAAC), which enhanced the adsorption capacity of PAAC by 58.59%. The adsorption isotherms of PAAC and M-PAAC were described well using the Temkin model, while the intraparticle diffusion model fitted the Cd(II) adsorption kinetics best. Precipitation with minerals was a crucial factor for Cd(II) adsorption on activated carbon (50.40% for PAAC and 40.41% for M-PAAC). Meanwhile, the Cd(II) adsorption by M-PAAC was also dominated by complexation with oxygen-containing functional groups (33.60%). This research provides a method for recovering wetland plant biomass to prepare activated carbon and efficiently treat Cd-containing wastewater.

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Recovery of cadmium, lead and nickel from leach solutions of waste electrical and electronic equipment using activated carbon modified with 1-(2-pyridylazo)-2-naphthol

Cited by 8 publications

References 36 publications

Capture and Release Mechanism of Ni and La Ions via Solid/Liquid Process: Use of Polymer-Modified Clay and Activated Carbons

Capture and Release Mechanism of Ni and La Ions via Solid/Liquid Process: Use of Polymer-Modified Clay and Activated Carbons

Biopolymer magnetic chitosan–graphene oxide composite for removal and extraction of aromatic amines from aqueous samples

Contributions of Various Cd(II) Adsorption Mechanisms by Phragmites australis-Activated Carbon Modified with Mannitol

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