The adsorption of copper(II) ions on to dehydrated wheat bran (DWB): determination of the equilibrium and thermodynamic parameters

Özer, Ayla; Özer, Dursun

doi:10.1016/j.procbio.2003.11.008

Cited by 299 publications

(144 citation statements)

References 29 publications

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“…However, sea weeds, molds, yeasts, bacteria have been tested for metal biosorption with encouraging results [41][42][43][44]. Table 4 shows various agricultural sorbents and the metal they removed [45][46][47][48][49][50].…”

Section: Removal Of Heavy Metals By Agricultural Wastesmentioning

confidence: 99%

Removal of Heavy Metals from Industrial Waste Water by Biomass-Based Materials: A Review

Ms¹,

Arm²

2016

J Pollut Eff Cont

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The recent researches are moving to removal of the agricultural and industrial pollutants from sewage treatment and discuss the possibility of the re-use of this water for agricultural purposes. The chemical contaminants represent the most dangerous types of contaminants found in the water for a many reasons, they are non-biodegradable environmentally and their high toxicity at very low concentrations in addition to the cumulative impact in the bodies of living organisms. The most toxic heavy metals are lead, mercury and chromium. It was estimated that the estimated that global impact of lead is 18-22 million people and of mercury 15 to 19 million people at 2010 according to Blacksmith Institute's World worst pollution problems. Contamination of the water resources with these elements, leads to polluting of the entire food chain and represents a real threat to the ecosystem. Thus, pure water shortage becomes a crucial problem worldwide. Among the most important research that can contribute to solving the problem of those related to water purification and improving the quality and re-use even in agriculture, for example, instead of wasted and discarded. There are many scientific methods applied in this regard. They include adsorption, precipitation, ion exchange, reverse osmosis, electrochemical treatments, membrane filtration, evaporation, flotation, and oxidation and biosorption processes. Some of these techniques however, have disadvantages such as incomplete metal removal, high reagent and energy requirements and generation of toxic sludge or other waste products. Among all these techniques, the adsorption is economically favorable and technically easy to separate. Instead of using commercial materials researchers have worked on inexpensive materials such as natural and agricultural products. Several works concerned the removal of heavy metals but the present work focuses on the sorbents based on biomass and their efficiency in removal of heavy metals from waste water.

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Section: Removal Of Heavy Metals By Agricultural Wastesmentioning

confidence: 99%

Removal of Heavy Metals from Industrial Waste Water by Biomass-Based Materials: A Review

Ms¹,

Arm²

2016

J Pollut Eff Cont

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“…Therefore, existing competition between hydronium and copper ions for adsorption sites resulted in the decrease of adsorption capacity [11,26].…”

Section: Ph Dependence Of Metal Retentionmentioning

confidence: 99%

Study of Agar Proportions Effect on a Gamma Ray Synthesized Hydrogel

Ammar¹,

Saied²,

Mejri³

et al. 2016

JMSE-A

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Abstract:In this study, we aimed to identify the effect of agar proportion on the synthesized superabsorbent properties based on PVP (Polyvinyl pyrrolidone), poly (ethylene glycol) (PEG) and agar. In a first stage, the study of swelling and deswelling behavior of synthesized hydrogel was done. It was proved that agar acts as a crosslinking inhibitor since it competes with free radicals. The pH versus swelling time was studied. The polymer was characterized by Fourier transform infrared spectra analysis and X-ray Diffraction. The removal of Cu(II) from aqueous solution by the prepared PVP/PEG/agar hydrogel was studied. Also, the influences of pH and contact time were investigated throughout adsorption experiments. The maximum retention capacity was found to be 36.5 mg g -1 for the hydrogel containing 1% of agar. The kinetic parameters were calculated from the experimental data and it was shown that they fit well with pseudo-second-order kinetic model.

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“…Where only adsorption of Ni(II) ions is involved, the temperature effect on retention time is relatively small. Empirical studies show that temperature has a small effect on adsorption (Tseng et al, 2007, Ozer et al, 2004, Bayramoglu et al, 2006, Bajpai and Johnson, 2007, Hanafiah et al, 2010, Taqvi et al, 2008.…”

Section: Effect Of Temperature On Adsorption Of Ni(ii) Ionsmentioning

confidence: 99%

Physicochemical studies

Guthrie¹

1968

Carbohydrate Chemistry

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A modified suspension polymerization was used for the preparation of the mesoporous magnetic-poly(divinylbenzene-co-vinylimidazole) (m-poly(DVB-VIM)) microbeads in size 53-212 μm of average diameter. The specific surface area and the DVB/VIM mol ratio of the microspheres were determined as 29.47 m 2 /g and 1:4 mol/mol with Fe 3 O 4 , respectively. The physicochemical studies of adsorption of Ni(II) ions from aqueous solutions such as pH, initial concentration, amount of mesoporous m-poly(DVB-VIM) microbeads, contact time, and temperature onto the m-poly(DVB-VIM) microspheres were carried out. The maximum adsorption capacities of the m-poly(DVB-VIM) microspheres towards Ni(II) ions were determined as 13.51, 20.14, 21.00 and 23.62 mg/g at 277 K, 298 K, 318 K, and 338 K, respectively. The dynamic and equilibrium adsorption behaviours of the system were adequately described by the pseudo-second-order kinetic and the Langmuir isotherm models, respectively. Various thermodynamic parameters, such as the Gibbs' free energy change (ΔG o ), the standard enthalpy change (ΔH o ) and the standard entropy change (ΔS o ) were also determined. Morever, after use in the adsorption, the m-poly(DVB-VIM) microbeads with paramagnetic property was separated from the via the applied magnetic force. These results indicate that the material studied could be used as a purifier for the removal of Ni(II) ions from water and wastewater under magnetic field.Keywords: Magnetic polymers; Adsorption isotherm; Adsorption kinetic; Adsorption thermodynamic; Ni(II) ions. R L the dimensionless separation factor k 1 the rate constant of pseudo first-order adsorption (min -1 ) k 2 the rate constant of pseudo second-order adsorption ((g/mg) min -1 ) k R the rate constant for the modified Ritchie's-second-order model (min -1 ) k i the intraparticle diffusion rate constant (mg/g min 0.5 ) R 2 linear regression coefficient t time (min)T temperature (K)

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The adsorption of copper(II) ions on to dehydrated wheat bran (DWB): determination of the equilibrium and thermodynamic parameters

Cited by 299 publications

References 29 publications

Removal of Heavy Metals from Industrial Waste Water by Biomass-Based Materials: A Review

Removal of Heavy Metals from Industrial Waste Water by Biomass-Based Materials: A Review

Study of Agar Proportions Effect on a Gamma Ray Synthesized Hydrogel

Physicochemical studies

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