1. Adsorption of lead ions and methylene blue on acrylate-modified hydrochars.
- Author
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Chen, Yan, Huang, Shen-Ao, Yu, Kun, Guo, Jian-Zhong, Wang, Yu-Xuan, and Li, Bing
- Subjects
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METHYLENE blue , *LEAD removal (Water purification) , *LEAD , *LANGMUIR isotherms , *ADSORPTION (Chemistry) , *IONS , *ACRYLATES , *ACRYLIC acid - Abstract
[Display omitted] • Acrylate-modified hydrochar with excellent adsorption properties was prepared easily. • The removal amounts of Pb(II) and methylene blue exceed 291.96 and 1014.96 mg/g. • Acrylate plays a key role in the adsorption process. • The acrylate content was more influential on adsorption than specific surface area. • The structure of hydrochar significantly affects its functional modification. Hydrochars are promising sorbents for wastewater treatment. Herein, two acrylate-modified hydrochars (AMHC 1 and AMHC 2) were obtained by grafting acrylic acid on the surface of two hydrochars (MHC 1 and MHC 2 hydrothermally carbonized in water and acidic medium respectively) with free radical polymerization. Characterizations show that MHC 2 is more prone to free radical polymerization than MHC 1 does, and has higher carboxylate content after modification. The adsorption amounts of AMHC 2 over methylene blue (MB) and Pb(II) are much higher than those of AMHC 1. Pseudo-second-order kinetic and Langmuir isotherm equations well fit the Pb(II) and MB sorption data of AMHC 2. The Pb(II) adsorptive mechanism is mainly inner-surface complexation accompanied by ion exchange and cation-π interaction. MB adsorption involves ion exchange, electrostatic interaction, H-bonding and π-π interaction. Hence, the one-step modification method of free radical polymerization under alkaline condition has great potential for preparing carboxylate-modified hydrochars to adsorb cationic pollutants. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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