Adsorption of mercuric ion from aqueous solutions using modified fly ash

Nguyen Thuy Chinh; Tran Do Mai Trang; Nguyen Thi  Tuyet; Nguyen Nhat  Oanh; Tran Thi  Mai; Nguyen Thi Thu Trang; Thai Hoang

doi:10.15625/2525-2518/56/6/12664

Author affiliations

Authors

Nguyen Thuy Chinh Institute for Tropical Technology, Vietnam Academy of Science and Technology,18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam https://orcid.org/0000-0001-8016-3835
Tran Do Mai Trang Thuy Loi University, 173 Tay Son, Dong Da, Ha Noi, Viet Nam
Nguyen Thi Tuyet Ly Thai To High School, Nguyen Van Troi, Dinh Bang, Tu Son, Bac Ninh, Viet Nam
Nguyen Nhat Oanh Hanoi PedagogicalUniversity 2, Nguyen Van Linh, Xuan Hoa, Phuc Yen, Vinh Phuc, Viet Nam
Tran Thi Mai Institute for Tropical Technology, Vietnam Academy of Science and Technology,18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam
Nguyen Thi Thu Trang Institute for Tropical Technology, Vietnam Academy of Science and Technology,18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam
Thai Hoang Institute for Tropical Technology, Vietnam Academy of Science and Technology,18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam

DOI:

https://doi.org/10.15625/2525-2518/56/6/12664

Keywords:

(3-Mercaptopropyl) triethoxysilane, fly ash, mercuric ion absorption, adsorption isotherm models

Abstract

In this study, fly ash was treated with NaOH solution (FAN) before modifying with (3-mercaptopropyl) triethoxysilane - MPTMS (FAMPS). By using FTIR, FESEM, XRD, EDX, and BET techniques, the change in structure, composition and morphology of FAN and FAMPS was evaluated. The FTIR spectra of FAN and FAMPS showed that there is no chemical reaction between the MPTMS and FAN. After modification, the FAMPS has a rough surface with composition difference from the FAN. Mercuric ion adsorption behavior as well as adsorptionisotherm models (Langmuir and Freundlich) of the FAN and FAMPS were also investigated and discussed. Thanks to FAN modification, the mercuric ion removal percent of the FAMPS was higher than that of the FAN. Owing to the adsorption data, Freundlich isotherm modelwas fitted for the mercuric ion adsorption process.

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