Journal
CHEMICAL ENGINEERING SCIENCE
Volume 239, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2021.116739
Keywords
Biochar; Pyrrole N; Pyridine N; Interaction mechanism; Density functional theory
Categories
Funding
- National Natural Science Foundation of China [21978047, 21776046]
- National Science Fund for Excellent Young Scholars [21722610]
- Fundamental Research Funds for the Central Universities [2242020K40033]
- Six Talent Peaks Project in Jiangsu Province [XCL-079]
Ask authors/readers for more resources
A novel N-doped porous graphitized biochar (NPGBC) with excellent adsorption capacities for methylene blue and methyl orange from wastewater was prepared in this study. The adsorption process followed pseudo-second-order kinetics and Sips models. Pyrrole N and pyridine N played crucial roles in the removal of methyl orange, and their contents affected the adsorption performance, with interactions including p-p stacking and electrostatic and hydrogen-bonding interactions.
A novel N-doped porous graphitized biochar (NPGBC) with a large specific surface area (950.52 m(2)/g), partly graphitized structure, and high nitrogen (N) doping (3.61%) was prepared by co-carbonization of alfalfa, ferric chloride (FeCl3), and potassium hydroxide (KOH). This biochar was used as an adsorbent with excellent methylene blue (MB) (326.90 mg/g) and methyl orange (MO) (906.52 mg/g) sorption capacities from wastewater. The sorption of MB and MO by NPGBC followed pseudo-second-order kinetics and Sips models. Density functional theory (DFT) calculations showed that the pyrrole N and pyridine N played decisive roles in the elimination of MO. When the content of pyridine N was more than 6.67%, or the content of pyrrole N was more than 3.00% in the calculation model, it was conducive to the sorption of MO. The interactions between NPGBC and organic dyes included p-p stacking and electrostatic and hydrogen-bonding interactions. The above results provide important reference values for the preparation and application of high-efficiency organic dye adsorbents. (C) 2021 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available