Eupatorium adenophorum derived adsorbent by hydrothermal-assisted HNO3 modification and application to Pb2+ adsorption. Issue 5 (October 2021)

• Record Type: Journal Article
• Authors: Liu, Dongdong; Tang, Yibo; Li, Jinming; Hao, Zhengkai; Zhu, Junhao; Wei, Jintao; Liu, Chang; Dong, Liangjie; Jia, Boyin; Chen, Guang
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 5(2021)
• Publication Date: 2021-10
• Subjects: Eupatorium adenophorum -- Hydrothermal carbonization -- HNO3 modification -- Pb2+ removal -- Adsorption mechanisms; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.105972
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Eupatorium adenophorum (EA), a kind of invasive plant, was utilized as feedstock to prepare the adsorbent using HNO3 impregnation (2.0 mol·L -1 ) before or after hydrothermal carbonization (HTC) for Pb 2+ adsorption in wastewater. A series of batch adsorption experiments including the solution pH, adsorbent dose and contact time showed prominent Pb 2+ adsorption performance of HNO3 -HTC-EA prepared by HNO3 modification first and then HTC treatment (e.g., equilibrium adsorption amount, 164.68 mg·g -1 ). The kinetic and isotherm analysis demonstrated that a physico-chemical complex adsorption was the main controlled step for two kinds of HNO3 -modified hydrochars adsorption, and Pb 2+ adsorption process of HNO3 -HTC-EA was multi-molecular layer adsorption. According to the physicochemical structure of HNO3 -modified hydrochars comparison before and after Pb 2+ adsorption, the surface complexation, electrostatic attraction, cation-π bond interactions and physical adsorption were main adsorption mechanisms. In addition, the developed mesopores of adsorbent could ensure the full binding of functional groups in the pores/channel with Pb 2+, improving the Pb 2+ adsorption capacity. Hydrothermal-assisted HNO3 modification provided a method to make use of Eupatorium adenophorum and other global exotic plants. Graphical Abstract: ga1 Highlights: This study provided a method to make use of Eupatorium adenophorum. Pb 2+ adsorption mechanism of Eupatorium adenophorum-based adsorbent was elucidated. The developed mesopores played an important role for Pb 2+ adsorption.