Biosorption of nickel from aqueous solutions by Acacia leucocephala bark: Kinetics and equilibrium studies

Subbaiah, Munagapati Venkata; Vijaya, Y.; Kumar, Nitesh; Reddy, A. Subba; Krishnaiah, A.

doi:10.1016/j.colsurfb.2009.07.028

Cited by 65 publications

(17 citation statements)

References 32 publications

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“…Because the C was greater than zero, the plot did not pass through the origin. At this circumstance, adsorption process has two stages which are the initial stage with the higher slope corresponds to the external mass transfer process, and the second stage with the lower slope relates the intra-particle diffusion as a rate limiting step [36]. When the plot does not pass through the origin, there is some extent of boundary layer control, indicating that the intra-particle diffusion process is not the only rate controlling step and that other kinetics models may also control the rate of the adsorption process.…”

Section: Kinetic Studiesmentioning

confidence: 99%

Titanium(IV) hydrate based on chitosan template for defluoridation from aqueous solution

Liu

et al. 2014

Applied Surface Science

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a b s t r a c tA cost effective bio-adsorbent, titanium(IV) hydrate based on chitosan template (Ti-CHI), was synthesized using Ti(SO 4 ) 2 and chitosan for defluoridation from aqueous solutions. The Ti-CHI material was characterized using FTIR, SEM with EDX, XRD, XPS and Zeta potential. The adsorption kinetics of fluoride onto Ti-CHI followed pseudo-second-order and intra-particle diffusion models. The Ti-CHI was effective for defluoridating systems with low fluoride concentrations (4.52 mg/L), exhibiting a 87.50% removal rate and permitting a residual fluoride concentration (0.55 mg/L). The most stable pH range for fluoride removal was from 4 to 9. After combining the results of pH effects, FTIR and Zeta potential, the NH groups and Ti OH groups were revealed as the fluoride adsorption sites on Ti-CHI. In addition, the carbonate ions present in the aqueous solutions adversely impact the fluoride adsorption. The Langmuir, Freundlich, and Langmuir-Freundlich models were used to illustrate the isotherms of the adsorption process. The adsorption of fluoride onto Ti-CHI fits the Langmuir and Langmuir-Freundlich isotherm models well. The maximum adsorption capacity for fluoride on the Ti-CHI was 16.12 mg/g. Thermodynamic studies revealed that the adsorption process was spontaneous.

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Section: Kinetic Studiesmentioning

confidence: 99%

Titanium(IV) hydrate based on chitosan template for defluoridation from aqueous solution

Liu

et al. 2014

Applied Surface Science

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“…The effluent emanating from these industries often contains high concentrations of Ni(II) ions, which are toxic to both higher and lower organisms [1,2]. In humans, Ni(II) can cause various types of acute and chronic health disorders, such as severe damage of lungs and kidney, skin dermatitis, nausea, vomiting, diarrhea, pulmonary fibrosis, renal edema, chest pain, rapid respiration, cyanosis and extreme weakness [3,4]. Besides, it is well known that nickel is carcinogenic and this effect is probably related to its lipid-peroxidation properties, which induce DNA-strand gaps and breaks, and DNA-protein crosslinks [5].…”

Section: Introductionmentioning

confidence: 99%

Nickel(II) biosorption by Rhodotorula glutinis

Suazo-Madrid

Morales-Barrera

Aranda-García

et al. 2010

J Ind Microbiol Biotechnol

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The present study reports the feasibility of using Rhodotorula glutinis biomass as an alternative low-cost biosorbent to remove Ni(II) ions from aqueous solutions. Acetone-pretreated R. glutinis cells showed higher Ni(II) biosorption capacity than untreated cells at pH values ranging from 3 to 7.5, with an optimum pH of 7.5. The effects of other relevant environmental parameters, such as initial Ni(II) concentration, shaking contact time and temperature, on Ni(II) biosorption onto acetone-pretreated R. glutinis were evaluated. Significant enhancement of Ni(II) biosorption capacity was observed by increasing initial metal concentration and temperature. Kinetic studies showed that the kinetic data were best described by a pseudo-second-order kinetic model. Among the two-, three-, and four-parameter isotherm models tested, the Fritz-Schluender model exhibited the best fit to experimental data. Thermodynamic parameters (activation energy, and changes in activation enthalpy, activation entropy, and free energy of activation) revealed that the biosorption of Ni(II) ions onto acetone-pretreated R. glutinis biomass is an endothermic and non-spontaneous process, involving chemical sorption with weak interactions between the biosorbent and Ni(II) ions. The high sorption capacity (44.45 mg g(-1) at 25°C, and 63.53 mg g(-1) at 70°C) exhibited by acetone-pretreated R. glutinis biomass places this biosorbent among the best adsorbents currently available for removal of Ni(II) ions from aqueous effluents.

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“…The variation in binding enthalpy DH, which is assumed not to change with temperature, was calculated using the classical Van't Hoff equation (Eq. 2) [22,23]:…”

Section: Resultsmentioning

confidence: 99%

Binding properties of apoferritin to nicotinamide and calcium

Liu

Chen

et al. 2012

Eur Food Res Technol

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The surface binding properties of apoferritin were investigated using two different substances, specifically, non-ionic nicotinamide and calcium. Nicotinamide could bind with apoferritin through hydrogen bonding. The binding location could be estimated by combining the Förster's non-radiation resonance energy transfer theory model and Molegro Virtual Docker docking software. The surface and internal cavities of apoferritin could be used to bind calcium through electrostatic attraction. Apoferritin monomers were stabilized only when the calcium concentration was lower than 20,000 lM, whereas a high calcium concentration could promote serious protein aggregation.

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Biosorption of nickel from aqueous solutions by Acacia leucocephala bark: Kinetics and equilibrium studies

Cited by 65 publications

References 32 publications

Titanium(IV) hydrate based on chitosan template for defluoridation from aqueous solution

Titanium(IV) hydrate based on chitosan template for defluoridation from aqueous solution

Nickel(II) biosorption by Rhodotorula glutinis

Binding properties of apoferritin to nicotinamide and calcium

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