Enhancement mechanism of the DBDP self-Fenton-like system by lightweight fly ash ceramsite: Pore-making and electron transfer with CoFe-LDO

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2024-05, Vol.488, p.151126, Article 151126
• Main Authors: Shen, Tianyao, Yang, Yi, Yu, Haihe, Wang, Peng, Xu, Peng, Qu, Jianhua, Zhang, Guangshan
• Format: Article
• Language: English
• Subjects: Ceramsite; Dielectric barrier discharge plasma; Fly ash; Layer double hydroxides/oxides
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2024.151126

[Display omitted] •Industrial solid waste-fly ash has been reutilized in the right place;•CoFe layered double oxides serves as both reactive sites and pore-forming agents;•Lightweight ceramsite possesses enhanced reactive species yield ability in dielectric barrier discharge plasma;•CoFe layered double oxides fly ash ceramsite enhancestheutilityofH2O2 more than O3 in dielectric barrier discharge plasma;•Electron transfer is the catalysis mechanism in and outside the composite ceramsite particles. Coal is the primary energy and consumption accounts for a higher proportion of fossil fuels, but its combustion product (fly ash) is a hazardous industrial solid waste (ISW). To alleviate its environmental problem and reuse waste, an appropriate disposal method for fly ash was proposed, which is using fly ash to construct the ceramsite as a catalyst carrier. To improve the catalysis property of the composite, layer double oxides (LDO) was doped into the lightweight ceramsite (CoFe-LDO/FAC) with dielectric barrier discharge plasma (DBDP) catalysis activity. In addition, following the mindset of a “waste-to-waste” strategy, apply the composite ceramsite enhancing the diuron-containing (DUR) water purification in a DBDP self-Fenton-like system, creatively using one stone kills two birds. The porous structure endows the CoFe-LDO/FAC possessed water adsorption ability, assisting oxidants and contaminants diffusion with water inside CoFe-LDO/FAC. More than 95 % of DUR could be removed within 10 min, and the DBDP + CoFe-LDO/FAC performed the properties of stability as evidenced by low metal ion leaching in the eight times recycle. During the catalysis process, CoFe-LDO/FAC promotes the dominant reactive species (1O2 and •OH) yield by the valence cycle of Fe2+/Fe3+ and Co2+/Co3+ in DUR decomposition. Abundant oxygen vacancy remedies the electron consumption and maintains the surface charge balance. This work provides a novel application of fly ash and LDO in water treatment and is helpful in ISW disposal.