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2012年 第6卷 第4期

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《环境科学与工程前沿（英文）》 >> 2012年 第6卷 第4期 doi: 10.1007/s11783-010-0275-1

Preparation and characterization of

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

发布日期： 2012-08-01
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Batch adsorption experiments were conducted to explore the adsorption of Cr(VI) in aqueous solutions by -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 and the positive value of showed that the adsorption of Cr(VI) in aqueous solutions by -FeOOH-coated sand was spontaneous, endothermic and occurred by physisorption.

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