Adsorption/Desorption of Hg(II) on FDU-1 Silica and FDU-1 Silica Modified with Humic Acid

Author(s)

Cides da Silva, Luis Carlos ^[1] ; Infante, Carlos M. C. ^[2] ; de Pra Urio, Ricardo ^[1] ; Cosentino, Ivana Conte ^[3] ; de Abreu Fantini, Marcia Carvalho ^[4] ; Matos, Jivaldo do Rosario ^[1] ; do Nascimento, Fernando H. ^[1] ; Masini, Jorge C. ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo, SP - Brazil

^[2] Curso Ciencia Farmaceut, Fac Ciencias Farmaceut, Brasilia, DF - Brazil

^[3] Inst Pesquisas Energet & Nucl, Sao Paulo, SP - Brazil

^[4] Univ Sao Paulo, Inst Fis, Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: SEPARATION SCIENCE AND TECHNOLOGY; v. 50, n. 7, p. 984-992, MAY 3 2015.
• Web of Science Citations: 2

Abstract

Incorporation of humic acid in the FDU-1 mesoporous silica improved Hg(II) adsorption and did not destroy the ordered network, providing surface area of 500 m(2) g(-1), pore volume of 0.9 cm(3) g(-1), and mean pore diameter of 10 nm. Carboxylic and phenolic groups increased the affinity by forming surface complexes with Hg(II). Isotherms (25.0 +/- 0.1 degrees C) were fitted to the Freundlich equation, exhibiting K-f values that increased with pH and 1/n that decreased to values < 1 with the heterogeneity of sites. Hg(II) desorption in 0.10 mol L-1 acetic acid was lower than 10%, suggesting that chemisorption processes govern the Hg(II) removal. (AU)

• FAPESP's process: 07/07646-2 - Potential applications of highly ordered mesoporous materials in analytical chemistry and the environment
• Grantee: Luís Carlos Cides da Silva
• Support Opportunities: Scholarships in Brazil - Post-Doctoral