Competitive adsorption of magnesium and calcium with phosphate at the goethite water interface: Kinetics, equilibrium and CD-MUSIC modeling

被引:45
作者
Atouei, Malihe Talebi [1 ]
Rahnemaie, Rasoul [1 ]
Kalanpa, Esmaiel Goli [2 ]
Davoodi, Mohammad Hossein [3 ]
机构
[1] Tarbiat Modares Univ, Dept Soil Sci, POB 14115-336, Tehran, Iran
[2] Univ Mohaghegh Ardabili, Dept Soil Sci, POB 179, Ardebil, Iran
[3] Soil & Water Res Inst, Lab Soil & Plant Anal, Karaj, Iran
关键词
Adsorption; Kinetic; Phosphate; Magnesium; Calcium; Ionic strength; CD-MUSIC model; Goethite; RAY-ABSORPTION SPECTROSCOPY; SURFACE STRUCTURAL APPROACH; CHARGE-DISTRIBUTION; CARBONATE SORPTION; IONIC-STRENGTH; SITE DENSITY; CENTRAL-ASIA; COMPLEXATION; ARSENATE; PROTON;
D O I
10.1016/j.chemgeo.2016.05.004
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
In natural environments, competitive interactions of ions with charged particles often control bioavailability and mobility of ions. In these systems, chemical reactions are often in a semi-equilibriumstate; thus, along with equilibrium data, kinetic data are of great importance in predicting ion bioavailability and mobility. Therefore, in this research, kinetics and equilibrium adsorption interactions of magnesium, calcium and phosphate on goethite are investigated as a function of time, pH, ion loading and ionic strength in single and binary ion systems. The thermodynamically valid model parameters, obtained from single ion systems by applying the CD-MUSIC model, are used to predict ion interactions in more complex systems, i.e. binary ion systems. Results indicate that the kinetics of phosphate and magnesium adsorption is pH-dependent and electrostatic attractive and repulsive forces dominantly control the reaction. Thus, adsorption of magnesium and calcium influences significantly both the amount of adsorbed phosphate and the reaction time, and vice versa. Therefore, the equilibration time for phosphate and magnesium adsorption on goethite is approximately <= 1 h when electrostatic forces are attractive and approximately 24 h when electrostatic forces are repulsive. Variation in ionic strength (0.01-0.3 M NaCl) has no significant effect on the magnesium and calcium adsorption, suggesting a large difference in the adsorption energy of Ca and Mg compared to Na, which is very likely due to the difference in their adsorption mechanism. Based on the model calculations, formation of two inner sphere surface complexes, as (FeOH)(2)Mg and (FeOH)(2)MgOH, is the dominant mechanism for magnesium adsorption. For calcium, however, a monodentate outer sphere surface complex dominates its adsorption at acid pH range and a monodentate inner sphere complex at basic pH range ( FeOHCa). This difference results in a different amount of charge on electrostatic planes that influences strongly phosphate adsorption such that phosphate adsorption is significantly higher in Ca-PO4 systems than in Mg-PO4 systems. (C) 2016 Published by Elsevier B.V.
引用
收藏
页码:19 / 29
页数:11
相关论文
共 45 条
[1]   Effects of simple organic acids on sorption of Cu2+ and Ca2+ on goethite [J].
Ali, MA ;
Dzombak, DA .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1996, 60 (02) :291-304
[2]   Arsenate and phosphate adsorption on ferrihydrite nanoparticles. Synergetic interaction with calcium ions [J].
Antelo, Juan ;
Arce, Florencio ;
Fiol, Sarah .
CHEMICAL GEOLOGY, 2015, 410 :53-62
[3]   CLUSTER FORMATION VERSUS ISOLATED-SITE ADSORPTION - A STUDY OF MN(II) AND MG(II) ADSORPTION ON BOEHMITE AND GOETHITE [J].
BLEAM, WF ;
MCBRIDE, MB .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1985, 103 (01) :124-132
[4]   Modeling proton binding at the goethite (α-FeOOH)-water interface [J].
Boily, JF ;
Lützenkirchen, J ;
Balmès, O ;
Beattie, J ;
Sjöberg, S .
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2001, 179 (01) :11-27
[5]   X-ray absorption spectroscopy investigation of aqueous Co(II) and Sr(II) sorption at clay-water interfaces [J].
Chen, CC ;
Hayes, KF .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1999, 63 (19-20) :3205-3215
[6]  
Dehghani F., 2012, J WATER RES AGR, V26, P114
[7]   Soil pH controls the environmental availability of phosphorus: Experimental and mechanistic modelling approaches [J].
Devau, Nicolas ;
Le Cadre, Edith ;
Hinsinger, Philippe ;
Jaillard, Benoit ;
Gerard, Frederic .
APPLIED GEOCHEMISTRY, 2009, 24 (11) :2163-2174
[8]   Modeling bacterial metal toxicity using a surface complexation approach [J].
Flynn, Shannon L. ;
Szymanowski, Jennifer E. S. ;
Fein, Jeremy B. .
CHEMICAL GEOLOGY, 2014, 374 :110-116
[9]   Individual and competitive adsorption of phosphate and arsenate on goethite in artificial seawater [J].
Gao, Y ;
Mucci, A .
CHEMICAL GEOLOGY, 2003, 199 (1-2) :91-109
[10]   Acid base reactions, phosphate and arsenate complexation, and their competitive adsorption at the surface of goethite in 0.7 M NaCl solution [J].
Gao, Y ;
Mucci, A .
GEOCHIMICA ET COSMOCHIMICA ACTA, 2001, 65 (14) :2361-2378