Simple Aminated Modified Zeolite 4A Synthesized Using Fly Ash and Its Remediation of Mercury Contamination: Characteristics and Mechanism

Mengdan Gao, Liyun Yang (), Shuangjian Yang, Tong Jiang, Fei Wu and Tetsuya Nagasaka
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Mengdan Gao: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Liyun Yang: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Shuangjian Yang: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Tong Jiang: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Fei Wu: Beijing 101 Middle School, Beijing 100086, China
Tetsuya Nagasaka: Department of Metallurgy, Graduate School of Engineering, Tohoku University, 02 Aoba-yama, Sendai 980-8579, Japan

Sustainability, 2022, vol. 14, issue 23, 1-17

Abstract: In this study, through simple ammonia impregnation, more amine functional groups could be introduced into the zeolite 4A synthesized using fly ash, which efficiently improved the mercury ion removal capacity of modified zeolites. The impregnation-modification mechanism of NH 3 ·H 2 O, ammonium chloride, and silane coupling agent (KH792) for zeolite 4A, and the Hg 2+ ion removal-efficiency by aminated zeolites, were studied and compared. Through ion exchange and hydroxyl reactions, NH 3 ·H 2 O impregnation introduced the same kinds of nitrogen-containing groups into zeolite as KH792 grafting, which was more than the NH 4 Cl modification. The Hg 2+ ion adsorption capacity of NH 3 ·H 2 O-zeolite was higher than those of KH792-zeolite and NH 4 Cl-zeolite through ion exchange and the complexation of nitrogen-containing groups. When coexisting with Pb 2+ , Cu 2+ , and Zn 2+ ions, the Hg 2+ ion removal rate of NH 3 ·H 2 O-zeolite was still higher than 99%. After five adsorption and desorption cycles, the Hg 2+ ion removal rate of NH 3 ·H 2 O-zeolite was 72.03%. When NH 3 ·H 2 O-zeolite was added to the leaching of mercury-contaminated soil, the content of soluble mercury significantly decreased. Therefore, we synthesized a potential cheap and safe adsorbent using fly ash as the main raw material through the simple NH 3 ·H 2 O impregnation modification for the treatment of mercury-contaminated water and soil.

Keywords: amination modification; fly ash; zeolite 4A; Hg 2+ ion; mercury-contaminated soil (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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