التفاصيل البيبلوغرافية
| العنوان: |
Removal of dissolved inorganic phosphorus with modified gravel sand: kinetics, equilibrium, and thermodynamic studies. |
| المؤلفون: |
Huang, Wei, Zhang, Liangjie, Gao, Junqi, Li, Jihua, Zhang, Jibiao, Zheng, Zheng |
| المصدر: |
Desalination & Water Treatment; Feb2016, Vol. 57 Issue 7, p3074-3084, 11p |
| مصطلحات موضوعية: |
GRAVEL, SAND, PHOSPHORUS, SORPTION, ISOTHERMAL processes, THERMODYNAMICS |
| مستخلص: |
The sorption of dissolved inorganic phosphorus by modified gravel sand (iron-doped and calcined gravel sand) was studied through kinetic, equilibrium, and thermodynamic experiments. The maximum phosphorus sorption capacity of iron-doped and calcined gravel sand was 1.01 and 2.93 mg g−1, respectively. When the solution pH gradually approached a highly alkaline condition, the phosphorus removal efficiency of iron-doped gravel sand decreased sharply and that of calcined gravel sand increased. With an increase in initial phosphorus concentration, the sorption capacity of calcined gravel sand increased significantly (0.8–3.1 mg g−1), and that of iron-doped gravel sand was relatively constant (1.2 mg g−1). Data from the isotherm experiments were well described by Langmuir isotherm model. Kinetic studies illustrated that the rate of sorption followed both the pseudo-first-order and pseudo-second-order models, and that the pseudo-second-order model could better describe the sorption kinetics. The calculated thermodynamic parameters suggested that the sorption was a feasible or spontaneous (ΔG < 0), entropy-driven (ΔS > 0), and endothermic (ΔH > 0) reaction. [ABSTRACT FROM PUBLISHER] |
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| قاعدة البيانات: |
Complementary Index |
