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Design swelling micas: Insights on heavy metals cation exchange reaction
https://orcid.org/0000-0003-0025-3078
Abstract Heavy metal pollution has become one of the most serious environmental problems, demanding specialized remediation mechanisms. Among the studied treatments, ion-exchange processes have been widely used due to their high remediation capacity, efficiency and fast kinetic. Here, the potential use of a new family of design micas as cation exchanger has been analysed. Micas with a layer charge in the range of brittle micas have been synthesized and their heavy metals cation exchange capacity analysed as a function of the nature of the heavy metal cations (Pb2+, Cd2+ or Hg2+), the nature of the counterions (Cl− or NO3 −), concentration of the solutions and the micas layer charge. A cation exchange ratio between 35% and 154% of their cation exchange capacity (CEC) was achieved, being more efficient when mica layer charge diminished. In general, the maximum adsorption capacity followed the trend: Hg2+ > Pb2+ > Cd2+. The efficiency of the cation exchange and adsorption mechanism of the synthetic micas depended on the experimental conditions and they were more efficient than raw and modified natural clay minerals.
Graphical abstract Display Omitted
Highlights Combined adsorption sites of design mica for remediation of heavy metal are proposed. A cation exchange ratio between 35 and 154% CEC was achieved in the design micas. The maximum adsorption was, in general, Hg2+ > Pb2+ > Cd2+. The structure of the hydrated mica was retained during the cation-exchange reactions.
Design swelling micas: Insights on heavy metals cation exchange reaction
https://orcid.org/0000-0003-0025-3078
Abstract Heavy metal pollution has become one of the most serious environmental problems, demanding specialized remediation mechanisms. Among the studied treatments, ion-exchange processes have been widely used due to their high remediation capacity, efficiency and fast kinetic. Here, the potential use of a new family of design micas as cation exchanger has been analysed. Micas with a layer charge in the range of brittle micas have been synthesized and their heavy metals cation exchange capacity analysed as a function of the nature of the heavy metal cations (Pb2+, Cd2+ or Hg2+), the nature of the counterions (Cl− or NO3 −), concentration of the solutions and the micas layer charge. A cation exchange ratio between 35% and 154% of their cation exchange capacity (CEC) was achieved, being more efficient when mica layer charge diminished. In general, the maximum adsorption capacity followed the trend: Hg2+ > Pb2+ > Cd2+. The efficiency of the cation exchange and adsorption mechanism of the synthetic micas depended on the experimental conditions and they were more efficient than raw and modified natural clay minerals.
Graphical abstract Display Omitted
Highlights Combined adsorption sites of design mica for remediation of heavy metal are proposed. A cation exchange ratio between 35 and 154% CEC was achieved in the design micas. The maximum adsorption was, in general, Hg2+ > Pb2+ > Cd2+. The structure of the hydrated mica was retained during the cation-exchange reactions.
Design swelling micas: Insights on heavy metals cation exchange reaction
https://orcid.org/0000-0003-0025-3078
Abstract Heavy metal pollution has become one of the most serious environmental problems, demanding specialized remediation mechanisms. Among the studied treatments, ion-exchange processes have been widely used due to their high remediation capacity, efficiency and fast kinetic. Here, the potential use of a new family of design micas as cation exchanger has been analysed. Micas with a layer charge in the range of brittle micas have been synthesized and their heavy metals cation exchange capacity analysed as a function of the nature of the heavy metal cations (Pb2+, Cd2+ or Hg2+), the nature of the counterions (Cl− or NO3 −), concentration of the solutions and the micas layer charge. A cation exchange ratio between 35% and 154% of their cation exchange capacity (CEC) was achieved, being more efficient when mica layer charge diminished. In general, the maximum adsorption capacity followed the trend: Hg2+ > Pb2+ > Cd2+. The efficiency of the cation exchange and adsorption mechanism of the synthetic micas depended on the experimental conditions and they were more efficient than raw and modified natural clay minerals.
Graphical abstract Display Omitted
Highlights Combined adsorption sites of design mica for remediation of heavy metal are proposed. A cation exchange ratio between 35 and 154% CEC was achieved in the design micas. The maximum adsorption was, in general, Hg2+ > Pb2+ > Cd2+. The structure of the hydrated mica was retained during the cation-exchange reactions.
Design swelling micas: Insights on heavy metals cation exchange reaction
Osuna, Francisco J. (author) / Pavón, Esperanza (author) / Alba, María D. (author)
Applied Clay Science ; 182
2019-09-05
Article (Journal)
Electronic Resource
English
| TIBKAT | 1969
Experimental studies on micas: synthesis
Engineering Index Backfile | 1957