Comparison of Selenate and Sulfate Adsorption on Goethite

Metal ion binding to iron oxides

“…Several publications present CD-MUSIC applications on experimental data (Venema et al, 1996a;Boily et al, 2000;Rietra et al, 2001). Weng et al (2001) used this approach to calculate trace element (Cu, Cd, Zn, Pb, and Ni) speciation in a soil and estimate the amount of TE adsorbed onto goethite.…”

Sorption behavior of hydroselenide (HSe−) onto iron-containing minerals

“…A considerable amount of sorption data of Se(IV) and Se(VI) onto ironcontaining minerals such as goethite [3,4,6,[11][12][13][14][15][16][17][18][19][20], hematite [5,6,13,19,21], magnetite [21][22][23][24][25][26][27], ferric oxides/oxyhydroxides [12,18,28,29], pyrite [3], biotite [3], and chlorite [3,13] has been obtained. Both Se(IV) and Se(VI) are sorbed onto iron-containing minerals, but the sorbability of Se(IV) is generally higher than that of Se(VI).…”

“…Duc et al [6] assumed a bidentate complex (≡FeO) 2 SeO for the CCM calculation for the sorption of Se(IV) onto hematite. Fukushi and Sverjensky [50] demonstrated the applicability of an extended TLM, which took into account the effect the electrostatics of water dipole desorption had on the measurements reported for the sorption of Se(VI) onto goethite by Rietra et al [16,17] and Hayes et al [12]. The sorption behaviors of Se(VI) were explained by a mixture of outer-and inner-sphere surface complexes [≡FeOH 2 + − SeO 4 2− , (≡FeOH 2 + ) 2− SeO 4 2− , and ≡FeOSeO 3 − ].…”

Adsorção de íons sulfato em ZrO2.nH2O preparado pelo método da precipitação convencional e da precipitação em solução homogênea

“…Nos últimos anos, vários adsorventes têm sido desenvolvidos para a remoção de íons sulfato, tais como: óxidos metálicos [10][11][12][13][14], quitosana [3][4][5][6][7][8][9][10][11][12][13][14][15], óxidos metálicos hidratados [2,16], zeólita [17], goethite [18][19][20][21][22][23] e alguns tipos de solo [24][25]. Dentre estes materiais, os óxidos metálicos são materiais promissores para a remoção desse íon por possuírem elevada afinidade pelos mesmos [19].…”