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

作者：Cides da Silva Luis Carlos; Infante Carlos M C; de Pra Urio Ricardo; Cosentino Ivana Conte; de Abreu Fantini Marcia Carvalho; Matos Jivaldo do Rosario; do Nascimento Fernando H; Masini Jorge C^*

来源：Separation Science and Technology (Philadelphia), 2015, 50(7): 984-992.

DOI：10.1080/01496395.2014.983246

• voltammetry
• ordered mesoporous silica
• Hg(II) adsorption
• humic acid
• FDU-1 silica

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.

• 出版日期2015-5-3