Enhanced electrochemical removal of arsenic and heavy metals from mine tailings

Rosa, Miguel; Egido, Jaime; Márquez, M. Carmen

doi:10.1016/j.jtice.2017.06.046

Cited by 32 publications

(10 citation statements)

References 19 publications

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“…Different electrochemical processes were already developed such as electrolytic processes (electrolysis, electrodialysis, electrocoagulation, electrofloculation, electroflotation), and different advanced oxidation processes, which can be coupled with electrochemistry (photocatalysis, photolysis of water, Fenton reaction, irradiation in the presence of an oxidant) [3][4][5][6][7][8][9][10][11][12]. For example, these electrochemical processes are known to be effective for the treatment of leachate coming from hazardous waste landfills [5] or wastewater [3,4,6,7,[10][11][12][13][14], or to remove organic compounds [1,3,[12][13][14][15][16] and/or inorganic species such as heavy metals [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Development of an efficient electrochemical process for removing and separating soluble Pb(II) in aqueous solutions in presence of other heavy metals: Studies of key parameters

Choumane

Peulon

2021

Chemical Engineering Journal

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Section: Introductionmentioning

confidence: 99%

Development of an efficient electrochemical process for removing and separating soluble Pb(II) in aqueous solutions in presence of other heavy metals: Studies of key parameters

Choumane

Peulon

2021

Chemical Engineering Journal

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“…Cameselle and Pena [86] demonstrated that the use of citric acid efficiently removes cadmium, cobalt, chromium, copper, lead, and zinc, since it favors the acidification of soil, solubilization of metals, their transportation by electro-osmosis, and their electromigration towards the cathode. The efficiency of citric acid is also relevant in the removal of arsenic [90].…”

Section: Electrochemical Remediationmentioning

confidence: 99%

Remediation of Metal/Metalloid-Polluted Soils: A Short Review

2021

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The contamination of soil by heavy metals and metalloids is a worldwide problem due to the accumulation of these compounds in the environment, endangering human health, plants, and animals. Heavy metals and metalloids are normally present in nature, but the rise of industrialization has led to concentrations higher than the admissible ones. They are non-biodegradable and toxic, even at very low concentrations. Residues accumulate in living beings and become dangerous every time they are assimilated and stored faster than they are metabolized. Thus, the potentially harmful effects are due to persistence in the environment, bioaccumulation in the organisms, and toxicity. The severity of the effect depends on the type of heavy metal or metalloid. Indeed, some heavy metals (e.g., Mn, Fe, Co, Ni) at very low concentrations are essential for living organisms, while others (e.g., Cd, Pb, and Hg) are nonessential and are toxic even in trace amounts. It is important to monitor the concentration of heavy metals and metalloids in the environment and adopt methods to remove them. For this purpose, various techniques have been developed over the years: physical remediation (e.g., washing, thermal desorption, solidification), chemical remediation (e.g., adsorption, catalysis, precipitation/solubilization, electrokinetic methods), biological remediation (e.g., biodegradation, phytoremediation, bioventing), and combined remediation (e.g., electrokinetic–microbial remediation; washing–microbial degradation). Some of these are well known and used on a large scale, while others are still at the research level. The main evaluation factors for the choice are contaminated site geology, contamination characteristics, cost, feasibility, and sustainability of the applied process, as well as the technology readiness level. This review aims to give a picture of the main techniques of heavy metal removal, also giving elements to assess their potential hazardousness due to their concentrations.

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“…5 , 6 A wide range of treatment technologies have been indicated for the removal of heavy metals from contaminated water in the last decades, starting from liquid–liquid extraction, 7 ion exchange, 8 chemical precipitation, 9 membrane filtration, 10 coagulation, 11 adsorption, 12 − 14 and ending with electrochemical treatment. 15 Among these approaches, adsorption is regarded as one of the very popular ones and captures enormous attention due to its high efficiency, simplicity, economy, and high environmental friendliness. 16 , 17 Hence, several of such adsorbents, such as graphene, 18 bentonite, 19 cellulose, 20 zeolite, 21 and so forth, were fabricated and applied to the elimination of heavy metals in aquatic systems.…”

Section: Introductionmentioning

confidence: 99%

Efficient and Environmentally Friendly Adsorbent Based on β-Ketoenol-Pyrazole-Thiophene for Heavy-Metal Ion Removal from Aquatic Medium: A Combined Experimental and Theoretical Study

et al. 2020

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A new sustainable and environmentally friendly adsorbent based on a β-ketoenol-pyrazole-thiophene receptor grafted onto a silica surface was developed and applied to the removal of heavy-metal ions (Pb(II), Cu(II), Zn(II), and Cd(II)) from aquatic medium. The new material SiNPz-Th was well characterized and confirms the success of covalent binding of the receptor on the silica surface. The effect of environmental parameters on adsorption including pH, contact time, temperature, and the initial concentration were investigated. The maximum adsorption capacities of SiNPz-Th for Pb(II), Cu(II), Zn(II), and Cd(II) ions were 102.20, 76.42, 68.95, and 32.68 mg/g, respectively, at 30 min and pH = 6. The adsorption isotherms, kinetics, and thermodynamic process were investigated and showed efficiency and selectivity toward Pb(II) and good regeneration performance. Density functional theory, noncovalent-interaction, and quantum theory of atoms in molecules calculations were used to study and to gain a deeper understanding of both the adsorption mechanism and selectivity of metal ions onto the adsorbent. Accordingly, metal ions such as Pb(II), Cu(II), and Zn(II) were bidentate coordinated with the adsorbent by nitrogen and oxygen atoms of the Schiff base C=N and hydroxyl group −OH, respectively, to form stable complexes. Whereas Cd(II) was coordinated in a monodentate fashion with oxygen atom of the hydroxyl group. Furthermore, the affinity of SiNPz-Th toward the metal ions was decreased in the order of Pb(II) > Cu(II) > Zn(II) > Cd(II), in good agreement with the experimental results. All these results highlight that SiNPz-Th has good potential to be an advanced adsorbent for the removal of lead ions from real water.

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Enhanced electrochemical removal of arsenic and heavy metals from mine tailings

Cited by 32 publications

References 19 publications

Development of an efficient electrochemical process for removing and separating soluble Pb(II) in aqueous solutions in presence of other heavy metals: Studies of key parameters

Development of an efficient electrochemical process for removing and separating soluble Pb(II) in aqueous solutions in presence of other heavy metals: Studies of key parameters

Remediation of Metal/Metalloid-Polluted Soils: A Short Review

Efficient and Environmentally Friendly Adsorbent Based on β-Ketoenol-Pyrazole-Thiophene for Heavy-Metal Ion Removal from Aquatic Medium: A Combined Experimental and Theoretical Study

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