Adsorption of Pb2+ ions on nanosized γ-Fe2O3: formation of surface ternary complexes on ligand complexation

Mallikarjuna, N. N.; Venkataraman, A.

doi:10.1016/s0039-9140(03)00119-x

Cited by 39 publications

(22 citation statements)

References 8 publications

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“…Excessive Pb exposure has been reported to result in brain damage and dysfunction of kidneys, liver, and central nervous system in humans, especially in children (WHO 2006). Lead contamination in the environment usually results from wastewaters or effluents from lead mining, battery recycling, electronics assembly plants, and military facilities, as well as landfill leachate and urban rainwater runoff (Mallikarjuna and Venkataraman 2003). Conventional cleanup technologies that are applied for Pb removal from contaminated water include chemical precipitation, ion exchange, or adsorption, among which the adsorption technique using activated carbon has been widely used because of its simplicity and costeffectiveness (Aggarwal et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Ethylenediamine-modified activated carbon for aqueous lead adsorption

2009

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This study is to develop a carbon-based adsorbent containing multiple functional ligands for effective removal of lead ions from aqueous media. Activated carbon was oxidized by nitric acid, followed by chlorination with thionyl chloride and reaction with ethylenediamine. Modified activated carbon (MAC) was characterized using scanning electron microscopy in conjunction of energy dispersive spectroscopy (SEM-EDS), Fourier transform infrared spectroscopy (FT-IR), and potentiometric titration. Surface characterizations confirmed that carboxyl, amine, and chlorine functional groups were effectively introduced onto the carbon surface by the treatments. The modifications lowered the pH at the point of zero charge (pH pzc ) from 9.6 to 2.55 and resulted in more negatively charged surfaces. Adsorptive experiments showed that aqueous Pb removal by MAC was faster, with a 62% higher capacity than the original activated carbon (60.2 vs. 37.2 mg g -1 ).

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Section: Introductionmentioning

confidence: 99%

Ethylenediamine-modified activated carbon for aqueous lead adsorption

2009

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“…The following sequence of reactions could be considered [29] CO 2 from the atmosphere forms CO 3 2-ion on reacting with OH - [29] Results obtained in the current investigation are compared with that of the literature reports. Nanosized γ-Fe 2 O 3 and its complex composite exhibit 15 and 50 % efficiency in removing lead ion in12 h duration [4]. Similarly, the efficiency achieved in using γ-Fe …”

Section: Adsorption Mechanismmentioning

confidence: 76%

“…Some of the reports of iron oxides as adsorbents include adsorption of lead [4], removal of selenite [5], removal of arsenite [6], removal of mercury [7] and removal of neutral red dye [8] [9][10][11][12]. Nickel ferrite has been widely studied as a magnetic, catalytic and gas sensing material but reports associated to its adsorption properties are limited [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Removal of Lead Ions by Nife2o4 Nanoparticles

Andal¹,

Buvaneswari²

2014

IJRET

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“…SEM analysis revealed that there were significant changes on the surface texture and the porosity of the adsorbent has holes and small openings found on the surface indicate that these increase the contact areas which facilitate pore diffusion during adsorption. A foam like net anchored on the surface of the adsorbent corresponding to the adsorbed heavy metal ion on the surface 8 . …”

Section: Adsorbent Characterizationmentioning

confidence: 99%

Kinetic and Isotherm Studies on Adsorption of Nickel (II) Ions by Brassera Oleracea as a Bioadsorbent

2016

IJSR

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An increase in population initiating rapid industrialization was found to consequently increase the effluents into the aquatic ecosystem. brassera oleracea -Cabbage, a vegetable wastes were used to produce bioadsorbent through environment friendly process. It were cut, washed, dried, grounded into powder and used for nickel(II) removal. Nickel(II) adsorption onto raw cabbage(RC) was depended upon the controlling parameters such as pH, contact time, initial concentration, adsorbent dosage, particle size and temperature. pH 5 was found to be suitable for nickel(II) removal. Equilibrium, thermodynamic and kinetic data were well fitted (R 2 = 0.991). Various thermodynamic parameters such as ΔGº, ΔHº and ΔSº have also been evaluated and it has been found that the adsorption process was spontaneous, endothermic and randomness in nature. The experimental data were analyzed using the Freundlich, Langmuir and Temkin adsorption isotherm equations. The equilibrium data were found to fit well in the Langmuir isotherm, which confirmed the monolayer coverage of Ni(II) ions onto RC. The monolayer adsorption capacity was 13.63mg/g. The R L and 'n' values has proved the favorability of nickel(II) adsorption onto raw cabbage. The uptake of metal ions normally follows pseudo-first order kinetics and the adsorption capacity increase at elevated temperatures. The results indicate that the RC can be used to effectively adsorb nickel(II) ions from wastewater.

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Adsorption of Pb2+ ions on nanosized γ-Fe2O3: formation of surface ternary complexes on ligand complexation

Cited by 39 publications

References 8 publications

Ethylenediamine-modified activated carbon for aqueous lead adsorption

Ethylenediamine-modified activated carbon for aqueous lead adsorption

Removal of Lead Ions by Nife2o4 Nanoparticles

Kinetic and Isotherm Studies on Adsorption of Nickel (II) Ions by Brassera Oleracea as a Bioadsorbent

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