Characterization of mesoporous rice husk ash (RHA) and adsorption kinetics of metal ions from aqueous solution onto RHA

Srivastava, Vimal Chandra; Mall, Indra Deo; Mishra, Indra Mani

doi:10.1016/j.jhazmat.2005.11.052

Cited by 509 publications

(270 citation statements)

References 33 publications

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“…where k 2 is the rate constant of pseudo-second-order adsorption (g/mg.min) and k 2 q e 2 or h is the initial adsorption rate (mg/g.min) [13], [14]. Adsorption isotherm can explain the equilibrium relationship between adsorbent and adsorbate, and determine the maximum capacity of adsorption.…”

Section: ) Pseudo-second-order Modelmentioning

confidence: 99%

Isotherm, Kinetic and Thermodynamic Studies on the Adsorption of Cd (II) and Zn (II) ions from Aqueous Solutions onto Bottom Ash

Sukpreabprom¹,

Arquero²,

Naksata³

et al. 2014

IJESD

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Abstract-Bottom ash is a waste material obtained from electricity generation through combustion of coal at the Mae Moh power plant in Thailand. The adsorption of Cd (II) and Zn (II) ions from aqueous solutions onto bottom ash was studied using batch experiments. The effect of pH, contact time and temperature were investigated. Adsorption isotherm data for metal ions was analyzed by the Langmuir and Freundlich isotherms. The Freundlich isotherm properly described the adsorption data for all studied temperatures. The results revealed that the adsorption kinetics followed pseudo-second-order kinetic model. Thermodynamic parameters such as Gibbs free energy change (∆G°), enthalpy change (∆H°) and entropy change (∆S°) were investigated. The calculated values showed that the adsorption process for both Cd (II) and Zn (II) ions was endothermic.

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Section: ) Pseudo-second-order Modelmentioning

confidence: 99%

Isotherm, Kinetic and Thermodynamic Studies on the Adsorption of Cd (II) and Zn (II) ions from Aqueous Solutions onto Bottom Ash

Sukpreabprom¹,

Arquero²,

Naksata³

et al. 2014

IJESD

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“…The magnitude of the activation energy has been commonly used as the basis for differentiating between physical and chemical adsorption. The activation energy for Ni(II) adsorption onto wMNR was found to be 9.56 kJ mol -1 for 25 mg L -1 initial concentrations, confirmed that the Ni(II) ions are physically adsorbed onto the wMNR surface (Srivastava et al 2006). …”

Section: Adsorption Kineticsmentioning

confidence: 55%

“…In addition, slope in the intraparticle diffusion given by Webber and Morris was found to start from origin and hence may be regarded as the rate-limiting step (Srivastava et al 2006). The kinetics of the Ni(II) adsorption was found to be improved by increasing the temperature from 303 to 323 K as evident from rate constants for pseudo-first-order model (Table 3) though equilibrium Ni(II) uptake was adversely affected, presumably an indication of physisorption (Srivastava et al 2006). Another evidence in support of physical sorption of Ni(II) onto wMNR was obtained when activation energy of Ni(II) adsorption was calculated using the following expression:…”

Section: Adsorption Kineticsmentioning

confidence: 90%

“…are given in Table 5. The wMNR has loading capacity almost equal to clinoptilolite (Sprynskyy et al 2006) but significantly higher than that for most of the adsorbents listed in Table 5 except modified pine bark (Argun et al 2010) and the activated carbon produced from almond husk (Srivastava et al 2006). Thus, wMNR can also be effectively considered as potential adsorbent for Ni(II) removal from contaminated water.…”

Section: Loading Capacitymentioning

confidence: 95%

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Application of manganese nodules leaching residue for adsorption of nickel(II) ions from aqueous solution

Randhawa

Dwivedi

Jana

2013

Int. J. Environ. Sci. Technol.

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Deep ocean manganese nodules are significant futuristic resource of copper, nickel and cobalt. After recovery of these valuable metals, a huge quantity of residue (*70 % of ore body) is generated. In the present paper, investigations carried out for the application of washed manganese nodule leaching residue (wMNR) for the removal of nickel (Ni) ions from aqueous solution by adsorption are described. Several parameters have been varied to study the feasibility of using wMNR as potential adsorbent for remediation of Ni(II)-contaminated water. The adsorption kinetics followed pseudo-first-order equation, and the rate of adsorption increased with solution temperature. Kinetics data of Ni(II) adsorption were also discussed using diffusion models of Webber-Morris and Dumwald-Wagner models. The equilibrium data were best fitted into Langmuir adsorption isotherm, and the maximum adsorption capacity was found to be 15.15 mg g -1 at pH 5.5 and temperature 303 K, which decreased to 10.64 mg g -1 upon raising the solution temperature to 323 K. The activation energy for Ni(II) adsorption onto wMNR was 9.56 kJ mol -1 indicated physical sorption. Desorption studies showed successful regeneration of adsorbent and recovery of Ni. This process can be utilized for removal and recovery of Ni from the industrial effluent.

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“…The rice husk ash was collected from the particulate collection equipment attached upstream to the stack of rice-fired boilers. The ash generated represents a severe disposal problem (Naiya et al, 2009;Srivastava et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of lead and copper ions from aqueous effluents on rice husk ash in a dynamic system

Vieira

Neto

Silva

et al. 2014

Braz. J. Chem. Eng.

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-This study evaluated the kinetic adsorption of Pb and Cu ions using rice husk ash as adsorbent in a fixed bed. The maximum adsorption capacities obtained for lead and copper ions in the fixed bed were 0.0561 and 0.0682 mmol/g (at 20 °C), respectively. The thermodynamic studies indicated that the lead adsorption process was exothermic and spontaneous, while the copper adsorption process was endothermic and spontaneous. Characterization results indicated the presence of several functional groups, amorphous silica and a fibrous and longitudinal structure of rice husks. Rice husk ash (RHA) from northern Brazil can be used as a bioadsorbent for the individual removal of Pb(II) and Cu(II) ions from metal-containing effluents.

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Characterization of mesoporous rice husk ash (RHA) and adsorption kinetics of metal ions from aqueous solution onto RHA

Cited by 509 publications

References 33 publications

Isotherm, Kinetic and Thermodynamic Studies on the Adsorption of Cd (II) and Zn (II) ions from Aqueous Solutions onto Bottom Ash

Isotherm, Kinetic and Thermodynamic Studies on the Adsorption of Cd (II) and Zn (II) ions from Aqueous Solutions onto Bottom Ash

Application of manganese nodules leaching residue for adsorption of nickel(II) ions from aqueous solution

Adsorption of lead and copper ions from aqueous effluents on rice husk ash in a dynamic system

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