Preparation and characterization of <italic>β</italic>-FeOOH-coated sand and its adsorption of Cr(VI) from aqueous solutions

doi:10.1007/s11783-010-0275-1

Front Envir Sci Eng

2012, Vol. 6

Issue (4) : 455-462 https://doi.org/10.1007/s11783-010-0275-1

RESEARCH ARTICLE

Preparation and characterization of β-FeOOH-coated sand and its adsorption of Cr(VI) from aqueous solutions

Chunhua XU^1,2, Dandan CHENG¹, Baoyu GAO¹(

), Zhilei YIN³, Qinyan YUE¹, Xian ZHAO²

1. Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China; 2. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China; 3. School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China

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Abstract

Batch adsorption experiments were conducted to explore the adsorption of Cr(VI) in aqueous solutions by β-FeOOH-coated sand. We investigated the key factors which affected the adsorption process such as adsorbent dosage, initial pH, initial Cr(VI) ion concentration, contact time and temperature. The uptake of Cr(VI) was very rapid and 44.3%, 51.6%, 58.9% of the adsorption happened during the first 180 minutes at 293K, 303K and 313K, respectively. The pseudo-second-order rate equation successfully described the adsorption kinetics. To study the adsorption isotherm, two equilibrium models, the Langmuir and Freundlich isotherms, were adopted. At 293K, 303K and 313K, the adsorption capacities obtained from the Langmuir isotherm were 0.060, 0.070 and 0.076 mg Cr(VI) per gram of the adsorbent, respectively. Thermodynamic parameters such as the change of energy, enthalpy and entropy were calculated using the equilibrium constants. The negative value of ΔG0 and the positive value of ΔH0 showed that the adsorption of Cr(VI) in aqueous solutions by β-FeOOH-coated sand was spontaneous, endothermic and occurred by physisorption.

Keywords β-FeOOH-coated sand Cr(VI) adsorption isotherm kinetics

Corresponding Author(s): GAO Baoyu,Email:bygao@sdu.edu.cn

Issue Date: 01 August 2012

Cite this article:

Chunhua XU,Dandan CHENG,Baoyu GAO, et al. Preparation and characterization of β-FeOOH-coated sand and its adsorption of Cr(VI) from aqueous solutions[J]. Front Envir Sci Eng, 2012, 6(4): 455-462.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-010-0275-1
https://academic.hep.com.cn/fese/EN/Y2012/V6/I4/455

Fig.1 SEM image of sand (a), -FeOOH-coated sand (b), TEM image of -FeOOH (c)

Fig.2 XRD pattern of -FeOOH-coated sand

Fig.3 Effect of sorbent dose on Cr(VI) removal by -FeOOH-coated sand

Fig.4 Effect of pH on Cr(VI) removal by -FeOOH-coated sand

Fig.5 Langmuir isotherm of Cr(VI) adsorption

Fig.6 Freundlich isotherm of Cr(VI) adsorption

Tab.1 Values of the constants and of the two models

Fig.7 Plots of ln vs 1 for adsorption of Cr(VI) on -FeOOH-coated sand

Tab.2 Values of thermodynamic parameters for Cr(VI) removal with -FeOOH-coated sand

Fig.8 Adsorption of Cr(VI) over time at C = 5mg·L and different temperatures

Fig.9 Adsorption of Cr(VI) over time at = 303K and different concentrations

Fig.10 Pseudo-second-order kinetic model

Tab.3 Kinetics parameters for adsorption of Cr(VI)

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