Kinetics, isotherm and thermodynamics for Cr(III) and Cr(VI) adsorption from aqueous solutions by crystalline hydrous titanium oxide

Debnath, Sushanta; Ghosh, Uday Chand

doi:10.1016/j.jct.2007.05.014

Cited by 175 publications

(89 citation statements)

References 34 publications

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“…Hence, intra-particle diffusion was the rate determining step. Similar result is reported elsewhere [30]. Table 6.…”

Section: Boyd Kineticssupporting

confidence: 91%

“…Table 5 [30] and R 2 > 0.96, thus confirming intra-particle diffusion as the rate determining step. Similar result has been obtained elsewhere [30]. Figure 9.…”

Section: 5g/lmentioning

confidence: 53%

“…If D p is in the range 10 -11 to 10 -13 cm 2 .s -1 , then intra-particle diffusion is the rate determining step [30]. Table 5 [30] and R 2 > 0.96, thus confirming intra-particle diffusion as the rate determining step.…”

Section: 5g/lmentioning

confidence: 82%

“…where q t is adsorption capacity at time, t, q e is adsorption capacity at equilibrium, bt is a mathematical function of F.q t [30]. Table 6 shows that the R 2 from plot of -bt against time > 0.98.…”

Section: Boyd Kineticsmentioning

confidence: 99%

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Adsorptive approach on nepholometric study of paint effluent using Tympanotonos fuscatus extract

Ezemagu¹,

Menkiti²,

Ugonabo³

et al. 2017

Bull. Chem. Soc. Eth.

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ABSTRACT. Adsorptive study of paint effluent coagulation using T. fuscatus coagulant (TFC) is investigated. Effects of pH, dose, time, and temperature were investigated. Functional group, crystalline, morphology and thermal characteristics of samples were determined. Equilibrium data were analysed by Langmuir, Freundlich, Temkin, Frumkin, and Dubinin-Radushkevich (D-R) isotherms. Kinetic data were fitted to reversible first order, pseudo-first-order, pseudo-second-order, Elovich, intra-particle diffusion and Boyd kinetic models. Process Gibbs free energy (∆G°), enthalpy (∆H°) and the entropy (∆S°) were evaluated. The process was best described by Langmuir isotherm (R 2 > 0.99; X 2 ˂ 0.6; SSE ˂ 0.7). Pseudo second order best fitted the kinetic data. The process was spontaneous, feasible and endothermic. 97% optimal removal was achieved at pH 5. Tympanotonos fuscatus extract has potential for application as an effective coagulant while showing significant component of adsorptive phenomenon

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“…Hence, intra-particle diffusion was the rate determining step. Similar result is reported elsewhere [30]. Table 6.…”

Section: Boyd Kineticssupporting

confidence: 91%

“…Table 5 [30] and R 2 > 0.96, thus confirming intra-particle diffusion as the rate determining step. Similar result has been obtained elsewhere [30]. Figure 9.…”

Section: 5g/lmentioning

confidence: 53%

Section: 5g/lmentioning

confidence: 82%

Section: Boyd Kineticsmentioning

confidence: 99%

See 2 more Smart Citations

Adsorptive approach on nepholometric study of paint effluent using Tympanotonos fuscatus extract

Ezemagu¹,

Menkiti²,

Ugonabo³

et al. 2017

Bull. Chem. Soc. Eth.

View full text Add to dashboard Cite

show abstract

“…This equation can singly be applied on adsorption data to identify whether the adsorption is monolayer or heterogenous. Numbers of papers have reported the suitability of R-P isotherm over Langmuir and Freundlich equations describing adsorption systems [33][34][35]. R-P proposed the following nonlinear equation:…”

Section: Redlich-peterson (R-p) Isothermmentioning

confidence: 99%

Surfactant‐Free One‐Pot Synthesis of Low‐Density Cerium Oxide Nanoparticles for Adsorptive Removal of Arsenic Species

Mishra

Saxena

Rawat

et al. 2017

Env Prog and Sustain Energy

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Cerium oxide (CeO 2 ) nanoparticles of size 3-5 nm and surface area 257 m 2 g 21 were synthesized using simple, single-pot, and surfactant-free aerogel process. Efforts were made to tune the surface area and porosity of CeO 2 nanoparticles by changing the concentration of precursors. CeO 2 nanoparticles were characterized by TEM, SEM, XRD, N 2 -BET, and FTIR. Prepared CeO 2 was used to remove As(III) and As(V) from water at variable contaminant concentrations (25-100 ppm) and pH (3-10). The adsorption process found extremely fast for the first few minutes of exposure. CeO 2 nanoparticles indicated adsorption capacities of 71.9 and 36.8 mg g 21 against As(III) and As(V), respectively. The adsorption data best fitted with Redlich-Peterson model, depicting monolayer adsorption. The adsorption followed pseudo-second-order kinetics and intraparticle diffusion with three-step diffusion process. The effect of co-existing anions (H 2 PO 2 4 , SO 22 4 , and HCO 2 3 ) indicated 80-96% reduction in adsorption capacity.

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Synthesis and application of modified chitosan beads for iron removal: kinetic and isotherm models

Correa-Murrieta¹,

López-Cervantes²,

Sánchez-Machado³

et al. 2014

Asia-Pacific J Chem Eng

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Chitosan beads (CBs) and glutaraldehyde cross-linked chitosan beads (CGLBs) were used to investigate adsorption behavior of Fe (II/III) ions. Optimal adsorption conditions were determined by analyzing the solution pH, adsorption time, and adsorbent dosage. Kinetic studies were analyzed by using pseudo-first-order, pseudo-second-order, Elovich and intraparticle diffusion models. The equilibrium data were modeled by Langmuir, Redlich-Peterson, and Freundlich. The kinetic data were found to follow the pseudo-first-order and pseudo-second-order models. The equilibrium data were best modeled by Langmuir and Freundlich isotherms. The maximum adsorption capacities estimated from the Langmuir model were 90.49 mg Fe (III)/g CGLBs, 59.85 mg Fe (II)/g CBs, and 56.99 mg Fe (II)/g CGLBs. These last two results allow concluding that the cross-linking slightly affected the adsorption capacity of pure chitosan, but the resulting beads are resistant to acidic medium using a small amount of glutaraldehyde and are a friendly alternative for the treatment of wastewater.

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Kinetics, isotherm and thermodynamics for Cr(III) and Cr(VI) adsorption from aqueous solutions by crystalline hydrous titanium oxide

Cited by 175 publications

References 34 publications

Adsorptive approach on nepholometric study of paint effluent using Tympanotonos fuscatus extract

Adsorptive approach on nepholometric study of paint effluent using Tympanotonos fuscatus extract

Surfactant‐Free One‐Pot Synthesis of Low‐Density Cerium Oxide Nanoparticles for Adsorptive Removal of Arsenic Species

Synthesis and application of modified chitosan beads for iron removal: kinetic and isotherm models

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