Abstract:

The resource application of coal gasification fine slag is an important way to achieve the “carbon peaking and carbon neutrality” in China. In this study, the coal gasification fine slag (FS) obtained from Space Furnace was used as the catalyst carrier after simple water washing and ultrasonic impregnation to prepare CoO@FSC with well dispersion. The as-prepared catalyst was used to activate peroxide single sulfate (PMS) for the efficient degradation of wastewater containing bisphenol A (BPA). The results showed that the CoO particles were uniformly distributed on the surface of the fine slag, which avoided the accumulation of metal oxides in the actual catalytic degradation process and thus provided more active sites for activating PMS. BPA could be completely degraded within 25 minutes by CoO@FSC under the conditions of 30℃, 0.2g/L catalyst dosage, 6mmol/L PMS dosage and 50mg/L BPA concentration and the degradation could be effective a wide pH range from weak acid to alkaline substrate. The free radical quenching experiment confirmed that the main active substances in the BPA catalytic degradation process were ¹O₂ and ·O{}_{\mathrm{2}}^{-}. The good catalytic performance of CoO@FSC demonstrated the potential application of coal gasification fine slag in the degradation of organic pollutants, and provided a theoretical basis for its further utilization.

Key words: coal gasification fine slag, activation, peroxide monosulfate, catalysis, degradation

摘要：

以航天炉煤气化细渣（FS）为载体，对其经简单水洗后，通过超声浸渍法在其表面负载CoO制备了分散性良好的煤气化细渣负载型复合催化剂CoO@FSC，并将其用于活化过氧化单硫酸盐（PMS）高效降解含双酚A（BPA）废水。结果表明，CoO颗粒均匀分布在细渣表面，避免了金属氧化物在实际催化降解过程中的聚集，为活化PMS提供了更多的活性位点。所制备催化剂CoO@FSC可在30℃、催化剂投加量0.2g/L、PMS投加量6mmol/L、BPA浓度50mg/L的条件下，25min内实现BPA的完全降解，且降解过程可以适应从弱酸到碱性基质的广泛pH范围。通过自由基淬灭实验发现，BPA的催化降解路径中的主要活性物质为¹O₂和·O{}_{\mathrm{2}}^{-}。CoO@FSC在活化PMS降解BPA方面表现出的良好性能，证明了煤气化细渣在有机污染物去除中的应用潜力，为后续进一步实现煤气化细渣的资源化应用提供了理论依据。

关键词: 煤气化细渣, 活化, 过氧化单硫酸盐, 催化, 降解