Volume Changes Due to SO2−4, SeO2−4, and H2PO−4Adsorption on Amorphous Iron(III) Hydroxide in an Aqueous Suspension

✍ Scribed by Noriko U. Yamaguchi; Masanori Okazaki; Takusei Hashitani

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 65 KB
• Volume: 209
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1998.5900

✦ Synopsis

III) hydroxide were released to the bulk. The volume changes due to SO 4 2؊ , SeO 4 2؊ , and H 2 PO 4 ؊ adsorption at initial pH 4.50 were ؉18, ؉18, and ؉14 cm 3 mol ؊1 , respectively. Phosphate, which adsorbed as an inner-sphere complex, released most of its hydration water to the bulk. The volume changes due to SO 4 2؊ and SeO 4 2؊ adsorption indicated that they were dehydrated at the water/amorphous iron(III) hydroxide interface. The smaller changes in volume for H 2 PO 4 ؊ compared to SO 4 2؊ and SeO 4

2؊ may be explained by differences of charges and adsorption mechanisms of these oxoanions.