Luo Xinrui, Tan Li, Wu Liping, Liu Qiuxia
College of Environmental Science and Engineering, China West Normal University Nanchong 637009 Sichuan China
Periodical Agency, Editorial Department of Ecology and Environmental Monitoring of Three Gorgee, College of Chemistry and Chemical Engineering, Yangze Normal University Chongqing 408100 China.
RSC Adv. 2025 Jul 15;15(31):25055-25061. doi: 10.1039/d5ra04274g.
The use of nano-catalysts to reduce nitroaromatic compounds is a promising wastewater treatment strategy. In this study, melamine foam (MF) is employed as the substrate, and sheet-like bismuth oxide iodide (BiOI) was grown on its surface through a cross-impregnation process involving Bi(NO) and KI solution. As a catalyst, bismuth oxide iodide/melamine foam composite (BiOI/MF) exhibits remarkable catalytic activity and excellent durability in the treatment of continuous flow 4-nitrophenol (4-NP) solutions. The loading capacity of BiOI on a 2 × 2 × 2 cm MF substrate is notably low at just 0.13 g, yet it can completely reduce 50 mL 4-NP solution (0.37 mmol L) within 32 minutes. After six consecutive cycles, the catalyst maintained a conversion efficiency of over 90%, with the total treatment amount for 4-NP reaching 1.49 × 10 mmol. Furthermore, BiOI/MF also exhibited high catalytic reduction activity towards other organic pollutants, such as methylene blue and methyl orange solutions. In this study, we propose an efficient and cost-effective composite catalyst that offers technical guidance for the practical treatment of wastewater and sewage.
使用纳米催化剂还原硝基芳香化合物是一种很有前景的废水处理策略。在本研究中，三聚氰胺泡沫（MF）被用作基底，通过涉及硝酸铋（Bi(NO)）和碘化钾（KI）溶液的交叉浸渍过程，在其表面生长出片状碘化铋（BiOI）。作为催化剂，碘化铋/三聚氰胺泡沫复合材料（BiOI/MF）在处理连续流动的4-硝基苯酚（4-NP）溶液时表现出显著的催化活性和优异的耐久性。在2×2×2 cm的MF基底上BiOI的负载量极低，仅为0.13 g，但它能在32分钟内完全还原50 mL的4-NP溶液（0.37 mmol/L）。经过连续六个循环后，该催化剂的转化效率保持在90%以上，4-NP的总处理量达到1.49×10 mmol。此外，BiOI/MF对其他有机污染物，如亚甲基蓝和甲基橙溶液，也表现出较高的催化还原活性。在本研究中，我们提出了一种高效且经济高效的复合催化剂，为废水和污水的实际处理提供了技术指导。
