N-Rich Algal Sludge Biochar for Peroxymonosulfate Activation toward Sulfadiazine Removal

Abstract

The fabrication of a green, high activity and low-cost carbon-based catalyst capable of activating new oxidant (peroxymonosulfate, PMS) for contaminants abatement is needed. In this research, we prepared novel N-doped biochars via one-step pyrolysis of algal sludge without external nitrogen sources. The obtained ASBC800 possessed the largest specific surface area (SBET = 145.596 m2 g−1) and thus it displayed the best catalytic performance, as revealed by the effective elimination of sulfadiazine (SDZ, >95% within 70 min) with 0.2 g L−1 ASBC800 and 0.5 mM PMS. Both radical species (e.g., SO4•−, and •OH), and nonradical regime (1O2 and electron-transfer) contributed to SDZ oxidation, in which ASBC800 played essential roles in activating PMS, accumulating SDZ, and regulating electron shuttle from SDZ to ASBC800-PMS*. Overall, this work not only provides a novel strategy for the synthesis of N-rich and cost-effective biochar but also promotes the development and application of carbon-based functional materials in environmental remediation.

Research Advances on Nitrogen-Doped Carbon Materials in COx Hydrogenation

“…The results indicated that nitrogen doping not only provides more reactive binding sites on the surface of carbon materials, but also enhances the reactivity of biochar by adjusting the electronic structure of the material framework. Liu et al [63] prepared novel N-doped biochar via the one-step pyrolysis of algal sludge without external nitrogen sources. High-temperature pyrolysis leads to a more enriched pore structure on the material surface, which is more favorable for the adsorption and decomposition of sulfadiazine.…”

Special Issue: Functional Nanoparticles for Environmental Contaminants Removal and Agricultural Application

“…This approach can decompose and eliminate organic pollutants from aqueous environments while enabling the production of valuable chemicals [27]. Liu et al (2023) synthesized novel N-doped biochar nanoparticles through the one-step pyrolysis of algal sludge without external nitrogen sources, yielding a highly active and cost-effective carbon-based catalyst capable of activating new oxidants for contaminant removal [28]. Additionally, Liu et al (2022) found that Sedum plumbizincicola nanoparticles can effectively remove Bisphenol A (BPA) from complex wastewater, demonstrating stable and efficient reactions [29].…”