ChenTaiwen,LiXiaodan,ZhangRong,et al.Adsorption Characteristics and Mechanism of Heavy Metals and Dyes by Modified Castor-based Hydrothermal Carbon[J].China Water & Wastewater,2026,42(13):84-91.
Adsorption Characteristics and Mechanism of Heavy Metals and Dyes by Modified Castor-based Hydrothermal Carbon
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第42卷
Number:
第13期
Page:
84-91
Column:
Date of publication:
2026-07-01
- Keywords:
- hydrothermal carbon; castor; adsorption; heavy metal; dye
- Abstract:
- Using castor leaves and stems as raw materials and polyethyleneimine as the amino grafting modifier, a functional hydrothermal carbon capable of efficiently and selectively adsorbing heavy metals in complex water bodies was prepared. The morphology and pore structure of the hydrothermal carbon were analyzed by scanning electron microscopy (SEM), N2 adsorption-desorption curve modeling (BET), and Fourier transform infrared spectroscopy (FTIR), and the adsorption mechanism for Cu(Ⅱ), Pb(Ⅱ), Cr(Ⅵ), and methyl orange (MO) dye in water was elucidated. The results showed that the prepared hydrothermal carbon was rich in functional groups such as amine/imine groups, carboxyl groups, and hydroxyl groups, and its adsorption capacities for Cu(Ⅱ), Pb(Ⅱ), Cr(Ⅵ), and MO were 58.48 mg/g, 226.25 mg/g, 34.04 mg/g, and 63.21 mg/g, respectively. Fitting of adsorption kinetics and adsorption isotherm models confirmed that the adsorption process was dominated by monolayer chemical adsorption, and the adsorption mechanism primarily involved coordination removal by nitrogen-containing functional groups (—NH2/—NH), electrostatic interactions, and complexation by oxygen-containing functional groups (—C=O/—COOH). Co-adsorption experiments of heavy metals and organic dyes demonstrated the simultaneous removal of heavy metals and organic matter by the adsorbent, thereby improving the economic cost-effectiveness of the adsorbent for the treatment of complex water bodies.
Last Update:
2026-07-01