High-performance plastic-derived metal-free catalysts for organic pollutants degradation via Fenton-like reaction

• DOI: 10.1016/j.scitotenv.2024.170185
• Publication Date: 2024-01-21T04:56:14Z
• Authors: Yu Hou; Qi Fu; Huajie Zhong; Jiaxing Yu; Yuan Tao; Zeyu Gong; Jianqiang Li; Songbo Wei; Junlang Qiu; Junhui Wang; Fang Zhu; Gangfeng Ouyang
• Keywords: Degradation

The preparation of waste plastics-derived catalysts is an effective strategy for the waste reclamation. However, plastic-derived material is unsuitable for wastewater purification due to its small specific surface area (SSA) and inadequate active sites (such as N/O sites). Herein, we synthesized graphene-like nanosheets using g-C3N4 as the self-sacrificing soft template and plastic as the carbon precursor. Consequently, this strategy greatly promoted the efficiencies of the emerging organic pollutants degradation with the SSA and N content of the plastic-derived biochar increasing up to 1043.4 m2/g and 17.53 at.%, respectively. In detail, 100 % sulfadiazine (SD) removal could be achieved in 180 s via the activation of peroxymonosulfate (PMS) and the catalytic activity is far higher than previous research. Mechanism experiments corroborated that such a striking performance was attributed to the generation of SO4•-, O2•- and 1O2. Meanwhile, kinds of plastic precursors, even medical waste (i.e., masks, gauze, operating caps and degreasing cotton) were also applicable. And the practical application of the plastic-derived catalyst was further demonstrated by treating pollutants in a continuous flow mode with in situ fabricated membrane. This work provides valuable insights into waste plastics processing and water pollutants removal.