Kinetic and equilibrium study for the sorption of cadmium(II) ions from aqueous phase by eucalyptus bark

Ghodbane, Ilhem; Nouri, Loubna; Hamdaoui, Oualid; Chiha, Mahdi

doi:10.1016/j.jhazmat.2007.06.079

Cited by 188 publications

(88 citation statements)

References 26 publications

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“…The equilibrium data were fitted with Langmuir (q e = q m bC e /(1 + bC e )) and Freundlich (q e = KC e 1/n ) equations and the former gave the best fit with R 2 = 0.992 ( Figure 1 and Table 1). Other adsorption studies on metal removal in water have also shown that Langmuir equation fitted the experimental data better than Freundlich equation [14,16,17]. In this study, the maximum uptake of Cu by MCS, q m was 0.0164 mg/g; while the Langmuir constant, b, was 3.1326 L/mg.…”

Section: Equilibrium Isothermsupporting

confidence: 47%

“…The effects of initial concentration, ratio of MCS to solution volume, pH, and dissolved oxygen concentration (DO) on the adsorption of Cu ions by MCS under batch conditions were also studied. Langmuir and Freundlich models were used to describe the equilibrium data whilst the kinetics of Cu adsorption was analyzed using the pseudo-first-order, the pseudo-second-order [14], and the Elovich models [15].…”

Section: Introductionmentioning

confidence: 99%

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Manganese Coated Sand for Copper (II) Removal from Water in Batch Mode

Rachmawati

Tizaoui

Hilal

2013

Water

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Abstract:Removal of heavy metals, such as copper ions, from water is important to protect human health and the environment. In this study, manganese coated sand (MCS) was used as an adsorbent to remove copper ions in a batch system. Equilibrium data were determined at a temperature of 25.6 °C and the Langmuir model was used to describe the experimental data. Mn-coating improved the removal of copper ions by 70% as compared to uncoated sand. Based on a kinetics study, the adsorption of copper ions on MCS was found to occur through a chemisorption process and the pseudo-second-order model was found to fit the kinetics experimental data well. Due to particle interactions, the equilibrium uptake was reduced as the ratio of sand to volume of solution increased. pH affected the removal of copper ions with lowest uptakes found at pH 3 and pHs >7, whilst at pHs in the range of 4 to 7, the uptake was highest and almost constant at the value of 0.0179 mg/g ± 4%. This study has also revealed that copper ions removal was dissolved oxygen (DO) dependent with the highest removal occurring at ambient DO concentration, which suggests that DO should be carefully studied when dealing with copper ions adsorption.

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Section: Equilibrium Isothermsupporting

confidence: 47%

Section: Introductionmentioning

confidence: 99%

Manganese Coated Sand for Copper (II) Removal from Water in Batch Mode

Rachmawati

Tizaoui

Hilal

2013

Water

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“…The remarkable increase of industrial processes and human activities intensified environmental contamination and pollution problems 1−3 The accumulation of heavy metals in the environment leads to many health problems on one hand 4,5 and to the deterioration of many ecosystems on the other hand 6 As a consequence, there are ever increasing legislative standards in most countries that impose treatment processes to reduce heavy metal concentrations or to recover them where feasible. The metals ions of primary concern according to the World Health Organization are those of aluminum, cadmium, chromium, cobalt, copper, iron, manganese, mercury, lead, arsenic, and nickel.…”

Section: Introductionmentioning

confidence: 99%

Impact of surface modification of green algal biomass by phosphorylation on the removal of copper(II) ions from water

Al-Qodah¹,

Al-Shannag²,

Amro³

et al. 2017

Turk J Chem

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A series of batch lab-scale experiments were performed to investigate the performance of dead phosphorylated algal biomass of Spirogyra species for the bioadsorption of Cu +2 ions from aqueous solutions. FT-IR and SEM analyses were performed to characterize the phosphorylated and raw algae. The SEM analysis indicated that the phosphorus content increases by about 5 times. The isotherm equilibrium data indicated that phosphorylation enhances the removal of Cu +2 from water by about 20%. The experimental isotherms fit well to Langmuir models with R 2 values close to 0.99.Adsorption kinetic study was conducted to investigate the effect of initial Cu +2 concentrations, pH, and adsorbent dose on the loading capacity of algal biomass. The optimum pH for the process was around 6 and the corresponding maximum loading capacity was 65 mg/g. The pseudo second-order kinetics successfully modeled the kinetic results with R 2 values closed to 0.99. The thermodynamic results indicated that the bioadsorption process is endothermic and spontaneous at initial Cu +2 concentrations lower than 100 mg/L. The results were promising and encourage the design of a continuous process using algal biomass to remediate water polluted with heavy metals.

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“…For both adsorbents the maximum percentage removal was attained at a shaking speed of 240 revolutions per minute. o C, 10mg/l, 2Hrs and pH7) This is due to increased diffusion rate of metal ions from the bulk liquid to the liquid boundary layer surrounding sorbent particles as the agitation speed is increased 12 . Enhancement of turbulence also ensures good diffusion of ions towards the sorbent particles.…”

Section: Effect Of Shaking Speedmentioning

confidence: 99%