Kinetic and thermodynamics of chromium ions adsorption onto low-cost dolomite adsorbent

Albadarin, Ahmad B.; Mangwandi, Chirangano; Al-Muhtaseb, Ala’a H.; Walker, Gavin; Allen, Stephen; Ahmad, Mohammad Norazmi

doi:10.1016/j.cej.2011.10.080

Cited by 483 publications

(159 citation statements)

References 61 publications

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“…The negative values of DG°and DH°indicate that the biosorption is spontaneous, exothermic and physical in nature, thus confirming the affinity of the biosorbent toward the MB molecule [75]. The negative entropy DS°r eflects the decreased randomness at the solid/solution interface during the MB biosorption [75,76]. Similar results were reported by Barka et al [27] and Han et al [77] where MB was adsorbed on Scolymus hispanicus L. and Fallen phoenix tree's leaf, respectively.…”

Section: Thermodynamic Studiessupporting

confidence: 77%

Biosorption of cationic dye from aqueous solutions onto lignocellulosic biomass (Luffa cylindrica): characterization, equilibrium, kinetic and thermodynamic studies

et al. 2016

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In the present study, biomass fiber (Luffa cylindrica) has been successfully used as biosorbent for the removal of a cationic dye namely, methylene blue, from aqueous solution using a batch process. The characterization of the biosorbent was carried out by the infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The chemical composition has been established by the energy dispersive X-Ray spectroscopy (EDS). The effects of various parameters such as the contact time (0-160 min), solution pH (2-10), biosorbent dose (0.5-8 g L -1 ), particle size, initial MB concentration (20-300 mg L -1 ) and temperature (20-60°C) were optimized. The biosorption isotherms were investigated by the Langmuir, Freundlich, Dubinin-Radushkevich and Tempkin models. The data were well fitted with the Langmuir model, with a maximum biosorption capacity of 49.46 mg g -1 at 20°C. The kinetics data were analyzed by the pseudo-first-order and pseudo-second-order models. The mass transfer model in terms of interlayer diffusion was applied to examine the mechanisms of the rate-controlling step (R 2 = 0.9992-0.9999). The thermodynamic parameters: free energy (DG°= -5.428 to -3.364 kJ mol -1 ), enthalpy (DH°= -20.547 kJ mol -1 ) and entropy (DS°= -0.052 kJ mol -1 K -1 ) were determined over the temperatures range (20-60°C). The results indicate that Luffa cylindrica could be an interesting biomass of alternative material with respect to more costly adsorbents used nowadays for dye removal.

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Section: Thermodynamic Studiessupporting

confidence: 77%

Biosorption of cationic dye from aqueous solutions onto lignocellulosic biomass (Luffa cylindrica): characterization, equilibrium, kinetic and thermodynamic studies

et al. 2016

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“…Dolomite which has similar properties to limestone is sometimes known as magnesium-limestone in industry. Its crystal structure consists of alternative layers of magnesium and calcium carbonate [24]. Therefore, dolomite had a characteristic to remove heavy metals as effective as limestone.…”

Section: Geopolymermentioning

confidence: 99%

Review on Adsorption of Heavy Metal in Wastewater by Using Geopolymer

et al. 2017

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Abstract. Rapid development of advanced technology in Malaysia gave impact increasing in the accumulation of heavy metal every day in our daily life through wastewater. Long term exposure of human bodies to heavy metals susceptible to receives various infections and diseases. From an environmental and economic perspective, adsorption is acceptable process that can be applied in wastewater treatment. However, usage of activated carbon most acknowledged and costly adsorbents lead people to find an alternative to activated carbon. Several studies of physical properties of geopolymer make them gain attention to replace an activated carbon in the treatment of heavy metal. This paper review adsorption of heavy metal by using geopolymer.

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“…Results are indicated that there are a number of important functional groups on the surface of the adsorbents. The broad adsorption band around 3432cm −1 ( Figure 1a) could to be attributed to the O-H stretching of the adsorbed water molecules and intra-molecular hydrogen bonding and bonded to the surface of fresh adsorbent [16][17][18]. The bands between 2850 and 2950 cm -1 observed in Figure 1a are due to the symmetrical and assymetrical stretching of -CH vibrations of -CH 3 and -CH 2 groups.…”

Section: Ft-ir Spectroscopic Studiesmentioning

confidence: 94%

Adsorption of Cr(VI) from Aqueous Solution onto a Mesoporous Carbonaceous Material Prepared from Naturally Occurring Pongamia pinnata Seeds

Kv¹,

BM²,

RS³

2015

J Environ Anal Toxicol

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Kinetic and thermodynamics of chromium ions adsorption onto low-cost dolomite adsorbent

Cited by 483 publications

References 61 publications

Biosorption of cationic dye from aqueous solutions onto lignocellulosic biomass (Luffa cylindrica): characterization, equilibrium, kinetic and thermodynamic studies

Biosorption of cationic dye from aqueous solutions onto lignocellulosic biomass (Luffa cylindrica): characterization, equilibrium, kinetic and thermodynamic studies

Review on Adsorption of Heavy Metal in Wastewater by Using Geopolymer

Adsorption of Cr(VI) from Aqueous Solution onto a Mesoporous Carbonaceous Material Prepared from Naturally Occurring Pongamia pinnata Seeds

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