Oyster shell facilitates the green production of nitrogen-doped porous biochar from macroalgae: a case study for removing atrazine from water

Abstract

Low-cost and green preparation of efficient sorbents is critical to the removal of organic contaminants during water treatment. In this study, the co-pyrolysis of macroalgae and oyster shell was designed to synthesize nitrogen-doped porous biochars for sorption removal of atrazine from water. Oyster shell played a significant role in opening pores in macroalgae-derived biochars, resulting in the surface area of the macroalgae (Enteromorpha prolifera and Ulva lactuca) and oyster shell co-pyrolyzed carbonaceous as high as 1501.80 m² g⁻¹ and 1067.18 m² g⁻¹, the pore volume reached 1.04 cm³ g⁻¹ and 0.93 cm³ g⁻¹, and O/C decreased to 0.09 and 0.08, respectively. The sorption capacity of atrazine to nitrogen-doped porous biochars (the Enteromorpha prolifera, Ulva lactuca and oyster shell co-pyrolyzed carbonaceous) reached 312.06 mg g⁻¹ and 340.52 mg g⁻¹. Pore-filling, hydrogen bonding, π-π or p-π stacking and electrostatic interaction dominated the multilayer sorption process. Moreover, the nitrogen-doped porous biochars showed great performance in cyclic reusability, and the Enteromorpha prolifera, Ulva lactuca and oyster shell co-pyrolyzed carbonaceous sorption capacity still reached 246.13 mg g⁻¹ and 255.97 mg g⁻¹, respectively. Thus, this study suggested that it is feasible and efficient to remove organic contaminants with the nitrogen-doped porous biochars co-pyrolyzed from macroalgae and oyster shell, providing a potential green resource utilization of aquatic wastes for environmental remediation.

Highlights

•	Nitrogen-doped porous biochars (NPBs) were derived from natural wastes.
•	Oyster shell enhanced the micropore and mesopore structures of NPBs.
•	Physical sorption dominated atrazine sorption onto the NPBs.

Keywords

Co-pyrolysis / Macroalgae / Oyster shell / Atrazine / Sorption

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Funding

the National Key Research and Development Program of China(2020YFC1807003); the Strategic Priority Research Program of the Sciences(XDA28010501); the Youth Innovation Promotion Association, CAS(2021309); National Natural Science Foundation of China(42277303)