Kinetics of heavy metal adsorption and desorption in soil: Developing a unified model based on chemical speciation

2018 ◽  
Vol 224 ◽  
pp. 282-300 ◽  
Author(s):  
Lanfang Peng ◽  
Paiyu Liu ◽  
Xionghan Feng ◽  
Zimeng Wang ◽  
Tao Cheng ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Chemical Speciation ◽  
Unified Model ◽  
Metal Adsorption ◽  
Heavy Metal Adsorption ◽  
Adsorption And Desorption ◽  
Model Based ◽  
Kinetics Of

A General Model for Kinetics of Heavy Metal Adsorption and Desorption on Soils

2013 ◽  
Vol 47 (8) ◽  
pp. 3761-3767 ◽  
Author(s):  
Zhenqing Shi ◽  
Dominic M. Di Toro ◽  
Herbert E. Allen ◽  
Donald L. Sparks
Keyword(s):  
Heavy Metal ◽  
General Model ◽  
Metal Adsorption ◽  
Heavy Metal Adsorption ◽  
Adsorption And Desorption ◽  
Kinetics Of

Regeneration of chitosan-based adsorbents used in heavy metal adsorption: A review

2019 ◽  
Vol 224 ◽  
pp. 373-387 ◽  
Author(s):  
Mohammadtaghi Vakili ◽  
Shubo Deng ◽  
Giovanni Cagnetta ◽  
Wei Wang ◽  
Pingping Meng ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Adsorption ◽  
Heavy Metal Adsorption

scholarly journals Combined Influence of Low-Grade Metakaolins and Natural Zeolite on Compressive Strength and Heavy Metal Adsorption of Geopolymers

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 486
Author(s):  
Alcina Johnson Sudagar ◽  
Slávka Andrejkovičová ◽  
Fernando Rocha ◽  
Carla Patinha ◽  
Maria R. Soares ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Compressive Strength ◽  
Natural Zeolite ◽  
Metal Adsorption ◽  
Low Grade ◽  
Heavy Metal Adsorption ◽  
Adsorption Model ◽  
X Ray ◽  
Adsorption Capacities

Metakaolins (MKs) prepared from low-grade kaolins located in the Alvarães (A) and Barqueiros (B) regions of Portugal were used as the aluminosilicate source to compare their effect on the compressive strength and heavy metal adsorption of geopolymers. Natural zeolite, an inexpensive, efficient adsorbent, was used as an additive in formulations to enhance geopolymers’ adsorption capacities and reduce MK utilization’s environmental footprint. Geopolymers were synthesized with the replacement of MK by zeolite up to 75 wt.% (A25, B25—25% MK 75% zeolite; A50, B50—50% MK 50% zeolite; A75, B75—75% MK 25% zeolite; A100, B100—100% MK). The molar ratios of SiO2/Al2O3 and Na2O/Al2O3 were kept at 1 to reduce the sodium silicate and sodium hydroxide environmental impact. Geopolymers’ crystallography was identified using X-ray diffraction analysis. The surface morphology was observed by scanning electron microscopy to understand the effect of zeolite incorporation. Chemical analysis using X-ray fluorescence spectroscopy and energy dispersive X-ray spectroscopy yielded information about the geopolymers’ Si/Al ratio. Compressive strength values of geopolymers obtained after 1, 14, and 28 days of curing indicate high strengths of geopolymers with 100% MK (A100—15.4 MPa; B100—32.46 MPa). Therefore, zeolite did not aid in the improvement of the compressive strength of both MK-based geopolymers. The heavy metal (Cd2+, Cr3+, Cu2+, Pb2+, and Zn2+) adsorption tests exhibit relatively higher adsorption capacities of Barqueiros MK-based geopolymers for all the heavy metals except Cd2+. Moreover, zeolite positively influenced divalent cations’ adsorption on the geopolymers produced from Barqueiros MK as B75 exhibits the highest adsorption capacities, but such an influence is not observed for Alvarães MK-based geopolymers. The general trend of adsorption of the heavy metals of both MK-based geopolymers is Pb2+ > Cd2+ > Cu2+ > Zn2+ > Cr3+ when fitted by the Langmuir isotherm adsorption model. The MK and zeolite characteristics influence geopolymers’ structure, strength, and adsorption capacities.

Converting Spent LiFePO4 Battery into Zeolitic Phosphate for Highly Efficient Heavy Metal Adsorption

2021 ◽  
Author(s):  
Wensong Zou ◽  
Xuezhen Feng ◽  
Wenfei Wei ◽  
Yuanhao Zhou ◽  
Ranhao Wang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Adsorption ◽  
Heavy Metal Adsorption ◽  
Highly Efficient ◽  
Lifepo4 Battery

Macrophyte biomass productivity for heavy metal adsorption

2021 ◽  
Vol 289 ◽  
pp. 112398
Author(s):  
Andrea B. Saralegui ◽  
Victoria Willson ◽  
Néstor Caracciolo ◽  
M. Natalia Piol ◽  
Susana P. Boeykens
Keyword(s):  
Heavy Metal ◽  
Biomass Productivity ◽  
Metal Adsorption ◽  
Heavy Metal Adsorption ◽  
Macrophyte Biomass
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