Construction of dual-carbon-confined metal sulfide nanocrystals via bio-mimetic reactors enabling superior Fenton-like catalysis

Peroxymonosulfate (PMS) based Fenton-like reactions are widely proposed for the degradation of refractory pollutants. However, the contradiction between achieving delicate architecture of efficient Fenton-like catalysts and the inevitable high operation cost remains to be reconciled. Herein, inspired by the cascaded bio-mineralization mechanism of seaweed, we propose a scalable and all-encompassing seaweed-mimetic reactor (SMR) to construct dual-carbon-confined metal sulfide (Co9S8) nanocrystals. Benefiting from the Co9S8 core with dual-carbon-confined structure, the as-prepared catalysts show splendid degradation efficiency towards organic pollutants (100 % in 14 min for rhodamine B) via activation of PMS. The integration of the catalysts in a continuous-flow catalytic reaction system achieves a 90 % degradation ratio of 28 L rhodamine B-contained wastewater (20 mg L-1) using only 1 g catalyst. In addition, feasibility and sustainability are guaranteed with ultra-low cost (only $0.065 g-1), convenient preparation procedures, and a balanced environmental burden. It is suggested that this efficient, sustainable, and cost-effective SMR-assisted strategy not only provides promising Fenton-like catalysts for practical wastewater remediation, but also takes a step toward the production of advanced metal sulfide/carbon heterostructures for diverse catalytic and energy applications.