Meng Yang, Fei Chao, Li Jingwen, Fan Zhiping, Wang Bo
School of Environmental and Safety Engineering, Liaoning Petrochemical University, Fushun 113001, China.
School of Environmental and Safety Engineering, Liaoning Petrochemical University, Fushun 113001, China.
Sci Total Environ. 2024 Aug 15;938:173495. doi: 10.1016/j.scitotenv.2024.173495. Epub 2024 May 24.
Zero-valent aluminum (ZVAl) is a potential activator for peroxodisulfate (PDS), yet the dense oxide film on its surface hampers electron transfer for the O-O bond cleavage of PDS. We synthesized zero-valent aluminum-biochar (BM-ZVAl@BC) composites through ball milling, which effectively disrupted the native oxide layer on BM-ZVAl@BC. Within the BM-ZVAl@BC/PDS system, biochar (BC) not only suppressed the rapid oxidation of BM-ZVAl@BC but also enhanced the dispersion and electron transfer rate of ZVAl, thereby improving the overall catalytic efficiency. Consequently, the phenol removal efficacy in the BM-ZVAl@BC/PDS system was notably improved. Optimal catalytic performance of the prepared BM-ZVAl@BC was achieved at a charcoal-to‑aluminum mass ratio of 2:1, resulting in 95.7 % phenol removal after 180 min. Quenching experiments and electron paramagnetic resonance (EPR) analysis revealed that both free radicals (SO, •OH, and O) and non-radical species (O) contributed to phenol degradation, with SO and •OH playing predominant roles. In summary, the BM-ZVAl@BC/PDS system represented an effective and promising technology for the remediation of phenolic water pollutants.
零价铝（ZVAl）是过二硫酸盐（PDS）的潜在活化剂，但其表面致密的氧化膜阻碍了PDS中O-O键断裂的电子转移。我们通过球磨合成了零价铝-生物炭（BM-ZVAl@BC）复合材料，有效地破坏了BM-ZVAl@BC表面的原生氧化层。在BM-ZVAl@BC/PDS体系中，生物炭（BC）不仅抑制了BM-ZVAl@BC的快速氧化，还提高了ZVAl的分散性和电子转移速率，从而提高了整体催化效率。因此，BM-ZVAl@BC/PDS体系中苯酚的去除效果显著提高。制备的BM-ZVAl@BC在木炭与铝的质量比为2:1时达到最佳催化性能，180分钟后苯酚去除率为95.7%。淬灭实验和电子顺磁共振（EPR）分析表明，自由基（SO、•OH和O）和非自由基物种（O）均对苯酚降解有贡献，其中SO和•OH起主要作用。综上所述，BM-ZVAl@BC/PDS体系是一种有效且有前景的酚类水污染物修复技术。
