Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 401, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123292
Keywords
Biochar; Activation; Adsorption; Cr(VI); Naphthalene
Categories
Funding
- National Outstanding Youth Science Fund Project of National Natural Science Foundation of China [41625002]
- International Cooperation and Exchange Programme [41961144030]
- Application Technology Research and Development Projects of Heilongjiang Province [GA19B10]
- Heilongjiang Postdoctoral Science Foundation [LBH-Z19004]
- MOA Modern Agricultural Talents Support Project
- Second Batch of National 10,000 Person Plan in 2016
- Special program for guiding local science and technology development by the central government [ZY18A05]
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A high-performance porous biochar (PBCKOH) was successfully synthesized through KOH chemical activation, showing excellent adsorption performance for both Cr(VI) and NAP in water treatment. The PBCKOH achieved high uptake capacities for both contaminants and exhibited multiple kinetics during the adsorption process. The enhanced adsorption of Cr(VI) was mainly attributed to electrostatic attraction, complexation, ion exchange, and reduction actions, while the high NAP uptake was achieved through pore filling and π-π stacking interactions.
Herein, a high-performance porous biochar described as PBCKOH was successfully synthesized by two-step pyrolysis of corn straw with chemical activation of KOH, and was employed for the elimination of Cr(VI) and naphthalene (NAP) from water. Benefiting from KOH activation, the PBCKOH was found to possess huge specific surface area of 2183.80 m2/g and many well-developed micropores with average particle size of 2.75 nm and main pore diameters distribution from 1 to 2 nm. The PBCKOH presented an excellent adsorption performance with a theoretical monolayer uptake of 116.97 mg/g for Cr(VI) and a heterogeneous adsorption capacity of 450.43 mg/g for NAP. The uptake equilibrium was attained within about 120 min for Cr(VI), while about 180 min for NAP following avrami fractional-order model, revealing the existence of multiple kinetics during the adsorption. The thermodynamic results showed that the uptake of both Cr(VI) and NAP occurred spontaneously (-AC), while in an endothermic nature for Cr(VI) (+ Arr) and an exothermic characteristic for NAP (-Al-f) with different randomness. Furthermore, the PBCKOH was believed to enhance the Cr(VI) adsorption mainly through the combination of electrostatic attraction, complexation, ion exchange and reduction action, while achieving the high NAP uptake by pore filling and Tc-Tc stacking interactions.
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