Toxic metal ion removal by terpolymer ion-exchanger from aqueous environments: synthesis, thermal degradation, batch separation, kinetic and isotherm studies

Sorghum bicolor (S.B.) is used in this work for preparing chemically modified adsorbent for toxic metal ions, i.e., cadmium(II) and copper(II). Thiourea is selected for chemical modification of this plant waste by microwave solid fusion methodology, so that its chelating ability for metal ions can be enhanced in both acidic and basic conditions, in a cheaper and quicker way. Characterization was carried out by different physiochemical means using FT-IR, SEM, etc. An increase in pHpzc value was observed in TSB, which is confirmed by FT-IR analysis. The effect of biosorption process parameters was also studied and found that maximum removal of these toxic ions occurred in slightly acidic pH (5-6) conditions, following pseudo-second-order kinetic model. Boyd plots indicated that film dispersion mode was the rate-determining step. Langmuir model indicated that the maximum metal ion removal capacity of TSB was 17.241 mg/g and 15.151 mg/g for cadmium(II) and copper(II) ions. So, TSB can be used on a larger scale for toxic metal ion removal by Sorghum bicolor waste in a cleaner way.

Download Full-text

A review of polyampholytic ion scavengers for toxic metal ion removal from aqueous systems

Water Research ◽

10.1016/j.watres.2021.117523 ◽

2021 ◽

pp. 117523

Author(s):

Łukasz Stala ◽

Justyna Ulatowska ◽

Izabela Polowczyk

Keyword(s):

Metal Ion ◽

Toxic Metal ◽

Aqueous Systems ◽

Metal Ion Removal ◽

Ion Removal

Download Full-text

New hybrid nanocomposite of copper terephthalate MOF-graphene oxide: synthesis, characterization and application as adsorbents for toxic metal ion removal from Sungun acid mine drainage

Environmental Science and Pollution Research ◽

10.1007/s11356-017-9823-6 ◽

2017 ◽

Vol 24 (28) ◽

pp. 22353-22360 ◽

Cited By ~ 11

Author(s):

Esmaeil Rahimi ◽

Neda Mohaghegh

Keyword(s):

Graphene Oxide ◽

Acid Mine Drainage ◽

Metal Ion ◽

Mine Drainage ◽

Toxic Metal ◽

Hybrid Nanocomposite ◽

Metal Ion Removal ◽

Ion Removal ◽

Acid Mine

Download Full-text

Adsorption of Mixtures of Toxic Metal Ions Using Non-Viable Cells of Saccharomyces Cerevisiae

Adsorption Science & Technology ◽

10.1260/0263-6174.30.1.43 ◽

2012 ◽

Vol 30 (1) ◽

pp. 43-63 ◽

Cited By ~ 12

Author(s):

Shahram Amirnia ◽

Argyrios Margaritis ◽

Madhumita B. Ray

Keyword(s):

Metal Ions ◽

Metal Ion ◽

Toxic Metal ◽

Operating Conditions ◽

Ion Concentration ◽

Yeast Cells ◽

Metal Ion Removal ◽

Ion Removal ◽

Model Equations ◽

Biomass Dosage

The use of waste biomaterial for the adsorption of heavy metal ions is an economically appealing alternative to conventional metal ion removal methods. In the present work, S. cerevisiae biomass has been shown to be capable of the simultaneous removal of more than 98% of Pb(II) ions, 60% of Zn(II) ions and up to 55% of Cu(II) ions from aqueous solutions in the 10–50 mg/ℓ concentration range. Model equations describing the removal efficiency of each metal ion were determined using Response Surface Methodology (RSM) with respect to operating conditions such as pH, initial metal ion concentration and biomass dosage. Characterization of the metal ion–biomass interactions responsible for biosorption was studied employing zeta potential measurements, BET, FT-IR and EDX techniques; these indicated that the uptake of metal ions by non-living yeast was a surface adsorption phenomenon. The results proved the involvement of an ion-exchange mechanism between the adsorbing metal ions and the cell walls. In the presence of the complete range of metal ions studied, yeast cells were more selective towards Pb(II) ions.

Download Full-text