En-Xuan Lin, Fang-Yu Wu, Yu-Lun Zhu, Yu-Rong Chang, Po-Yi Wu and Pei Yuin Keng
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引用次数: 0
Abstract
This study presents structurally robust cobalt pyroborate (Co2B2O5) as a heterogeneous catalyst for advanced oxidation processes (AOPs). The Co2B2O5 nanoparticles were systematically characterized and employed to activate peroxymonosulfate (PMS) effectively in the degradation of various organic recalcitrant pollutants. When compared to conventional heterogeneous CoO and Co3O4 catalysts in sulfate radical-advanced oxidation processes (SR-AOPs), the Co2B2O5 catalyst exhibited seven-fold and 2.7-fold increases in degradation rate, respectively. The Co2B2O5/PMS system was optimized to enable degradation of a diverse array of persistent organic pollutants, including tetracycline, 4-nitrophenol and sulfamethoxazole, with respective first-order rate constants of 0.136 min−1 and 0.104 min−1, and 0.092 min−1, respectively. Mechanistic insights, supported by selective trapping experiments and electron paramagnetic resonance (EPR) analyses, revealed that surface-bound sulfate radicals serve as the primary reactive oxygen species (ROS) under dark conditions. Singlet oxygen species also contributed to the degradation process via a non-radical pathway. Remarkably, the catalyst maintained its effectiveness in the presence of natural organic matter, highlighting its potential practical applicability for wastewater treatment. This study presents the single-component cobalt pyroborate catalyst with high catalytic activity under varying conditions, thus providing unprecedented benefits for industrial wastewater treatment applications.
期刊介绍:
Environmental Science: Nano serves as a comprehensive and high-impact peer-reviewed source of information on the design and demonstration of engineered nanomaterials for environment-based applications. It also covers the interactions between engineered, natural, and incidental nanomaterials with biological and environmental systems. This scope includes, but is not limited to, the following topic areas:
Novel nanomaterial-based applications for water, air, soil, food, and energy sustainability
Nanomaterial interactions with biological systems and nanotoxicology
Environmental fate, reactivity, and transformations of nanoscale materials
Nanoscale processes in the environment
Sustainable nanotechnology including rational nanomaterial design, life cycle assessment, risk/benefit analysis