Removal of Heavy Metals Using Adsorption Processes Subject to an External Magnetic Field

Virgen, Ma. del Rosario Moreno; Vázquez, Omar Francisco González; Montoya, Virginia Hernández; Gómez, Rigoberto Tovar

doi:10.5772/intechopen.74050

Cited by 16 publications

(12 citation statements)

References 112 publications

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“…This observed trend, based on the ionic radius, may be caused by the quick saturation of adsorption sites induced by the largest ions. This behavior is in agreement with that observed for the absorption of Pb(II), Cd (II), Ni(II), and Zn(II) using natural zeolite as a sorbent, where the adsorbed amount decreased as the ionic radius increased [37].…”

Section: Thermodynamic Isotherm Characterizationsupporting

confidence: 90%

Use of Chemically Treated Human Hair Wastes for the Removal of Heavy Metal Ions from Water

Zhang

Carrillo-Navarrete

López‐Mesas

et al. 2020

Water

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Human hair is considered a ubiquitous waste product and its accumulation can cause environmental problems. Hence, the search for alternatives that take advantage of this waste as a new raw material is of interest, and contributes to the idea of the circular economy. In this study, chemically modified human hair was used as a low cost biosorbent for the removal of heavy metal ions from aqueous solutions. The effect of the contact time, the pH, and the biosorbent concentration on the biosorption process were investigated. Kinetic modeling indicated that the pseudo-second order kinetic equation fitted well with R2 > 0.999. Furthermore, the equilibrium data fitted the Langmuir adsorption isotherm at 295 K resulting in saturation concentrations of 9.47 × 10−5, 5.57 × 10−5, 3.77 × 10−5, and 3.61 × 10−5 mol/g for the sorption of Cr(III), Cu(II), Cd(II), and Pb(II), respectively. The biosorption process did not change the chemical structure and morphology of the hair, which was shown by FTIR and SEM. In addition, desorption experiments prove that 0.1 mol/L EDTA solution is an efficient eluent for the recovery of Pb(II) from the treated human hair. To summarize, treated human hair showed satisfactory biosorption capacity and can be considered as an effective biosorbent for the treatment of water with a low concentration of heavy metal ions.

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Section: Thermodynamic Isotherm Characterizationsupporting

confidence: 90%

Use of Chemically Treated Human Hair Wastes for the Removal of Heavy Metal Ions from Water

Zhang

Carrillo-Navarrete

López‐Mesas

et al. 2020

Water

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“…It implied that adsorption of heavy metals onto AC-NLP was reversible process, as per discussed in chemical kinetic study. Further, total regeneration was not achieved due to adsorption was chemisorption and strong bond was formed between heavy metal and AC-NLP during adsorption; and not disintegrated even strong acid, hydrochloric acid 39,40 .…”

Section: Resultsmentioning

confidence: 99%

Batch and continuous fixed bed adsorption of heavy metals removal using activated charcoal from neem (Azadirachta indica) leaf powder

Patel¹

2020

Sci Rep

125

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The present investigate was intended for adsorption of heavy metals i.e. Pb, Cu, Cr, Zn, Ni and Cd onto activated charcoal prepared from neem leaf powder (AC-NLP) using batch and column studies. Batch adsorption was performed using different variables like adsorbent dose, temperature and contact duration. Thermodynamic analysis of batch treatment concluded that adsorption is thermodynamically feasible and endothermic. This adsorption followed the Pseudo second-order kinetic model derived from correlation coefficient values of chemical kinetic studies. For column study, interpretation of breakthrough curves and parameters were conducted by varying flow rate, initial concentration and bed height; and reveal that optimum conditions were lower flow rate (5 mL/min) and lower initial concentration (5 mg/L) and higher bed height (20 cm). Comparisons of batch and column study through isotherm models were evaluated and column study is more preferred than batch treatment. Maximum Thomas adsorption capacity was achieved upto 205.6, 185.8, 154.5, 133.3, 120.6, 110.9 mg/g for Pb, Cu, Cd, Zn, Ni and Cr respectively. This removal pattern is elucidated by metal ionic properties. Various adsorbing agents such as acids and bases were utilized for adsorption–desorption of AC-NLP.

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“…These may include ion-exchange, chelation and coordination, complex formation, surface electrostatic interaction, or a combination of some or all these mechanisms. 60 In our case, and in terms of adsorption capacities, the uptake performance of melanin nanoparticles is highest for Zn 2+ , Ni 2+ and Co 2+ metallic ions. The adsorption capacity is relatively low for Cu 2+ and drops significantly for Cd 2+ and Pb 2+ ions.…”

Section: Figurementioning

confidence: 51%

“…These may include ion-exchange, chelation and coordination, complex formation, surface electrostatic interaction, or a combination of some or all these mechanisms. 60 …”

Section: Resultsmentioning

confidence: 99%

Fast and Reliable Synthesis of Melanin Nanoparticles with Fine-Tuned Metal Adsorption Capacities for Studying Heavy Metal Ions Uptake

Darwish¹,

Kalil²,

Alqahtani³

et al. 2021

NSA

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Purpose: Adsorption and uptake of heavy metals by polymeric nanoparticles is driven by a variety of physicochemical processes. In this work, we examined heavy metal uptake by synthetic melanin nanoparticles and analyzed physicochemical properties that affect the extent of metal uptake by the nanoparticles. Methods: Eumelanin nanoparticles were synthesized in a one-pot fast process from a 5,6-diacetoxy indole precursor that is hydrolyzed in situ into dihydroxy indole (DHI). The method allows the possibility of changing the level of sodium ions that ends up in the nanoparticles. Two variants of synthetic DHI-melanin (low-sodium and high sodium variants) were evaluated and demonstrated different relative adsorption efficiencies for heavy metal cations. Results and Discussion: For the low-sodium DHI-melanin and in terms of percentages of metal ion removal, the relative order of extraction from 50 ppm solutions was Zn 2+ > Cd 2+ > Ni 2+ > Co 2+ > Cu 2+ > Pb 2+ , with the extraction percentages ranging from 90% down to 76%, for a 30-minute adsorption time before equilibrium. The lower-sodium DHI-melanin consistently removed more Zn 2+ than the higher-sodium variant. Electron microscopy (SEM) showed an increase in melanin particle size after metal ions uptake. In addition, X-ray photoelectron spectroscopy (XPS) of DHI-melanin particles with depth profiling after Zn ions uptake supported particle swelling and ion transport within the particles. Conclusion: These initial studies showed the potential of this straightforward synthesis to obtain synthetic DHI-melanin nanoparticles similar to those from biological sources with the possibility to fine-tune their metal adsorption capacity. These synthetic nanoparticles can be used either for the removal of a variety of metal ions or to mimic and study mechanisms of metal uptake by melanin deriving from biological sources, with the potential to understand, for instance, differential heavy metal uptake by various melanic pigments.

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Removal of Heavy Metals Using Adsorption Processes Subject to an External Magnetic Field

Cited by 16 publications

References 112 publications

Use of Chemically Treated Human Hair Wastes for the Removal of Heavy Metal Ions from Water

Use of Chemically Treated Human Hair Wastes for the Removal of Heavy Metal Ions from Water

Batch and continuous fixed bed adsorption of heavy metals removal using activated charcoal from neem (Azadirachta indica) leaf powder

Fast and Reliable Synthesis of Melanin Nanoparticles with Fine-Tuned Metal Adsorption Capacities for Studying Heavy Metal Ions Uptake

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