Qing Sun, Lu Yang, Yutao Zhou, Jian Zhang, Jiawei Sheng
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引用次数: 0
Abstract
Cobalt-based catalysts demonstrate significant activity in activating peroxymonosulfate (PMS) for the degradation of water pollutants. Nevertheless, their practical application remains constrained due to concerns regarding potential cobalt leaching, associated toxicity risks, and overall stability under operational conditions. A novel CoCa-SBA-600 catalyst was synthesized via a hydrothermal-assisted SBA-15 sacrificial templating strategy, where the zeolite simultaneously served as a silicate precursor and structural scaffold. Comprehensive characterization (XRD, FTIR, SEM, TEM and XPS) confirmed the co-existence of CaCO3-stabilized cobalt silicate nanoflowers with ultrathin two-dimensional layered morphology. The CaCO3 incorporation remarkably enhanced PMS activation efficiency while suppressing Co²⁺ leaching (≤0.51 mg/L), achieving 99.29% metronidazole (MNZ) degradation within 10 min at 500 mg/L catalyst dosage. The system demonstrated exceptional universality, degrading multiple antibiotics (≥96.97% efficiency within 10 min) across diverse aqueous matrices (tap/lake/river water) and maintained >98% MNZ removal after four cycles, highlighting robust stability. Mechanistic studies verified singlet oxygen (¹O₂) as the dominant reactive species via quenching experiments and EPR analysis, with proposed MNZ degradation pathways aligned with LC-MS data. Notably, seed germination assays confirmed the low biotoxicity of degradation intermediates. The calcium carbonate-mediated stabilization strategy proposed in this study achieves efficient stabilization of cobalt silicate materials. The insights gained not only advance the development of environmentally friendly advanced oxidation processes (AOPs) but also provide a new paradigm for designing long-lasting catalysts for environmental remediation applications.
期刊介绍:
The journal aims to publish papers at the forefront of nanoscale science and technology and especially those of an interdisciplinary nature. Here, nanotechnology is taken to include the ability to individually address, control, and modify structures, materials and devices with nanometre precision, and the synthesis of such structures into systems of micro- and macroscopic dimensions such as MEMS based devices. It encompasses the understanding of the fundamental physics, chemistry, biology and technology of nanometre-scale objects and how such objects can be used in the areas of computation, sensors, nanostructured materials and nano-biotechnology.