Song Huiping, Zhang Shirui, Cheng Shuyan, Fan Zhenlian, Gao Hongyu, Cheng Fangqin
Institute of Resources and Environmental Engineering, Shanxi University, Shanxi Yellow River Laboratory Taiyuan China
RSC Adv. 2025 Jan 10;15(2):832-843. doi: 10.1039/d4ra08085h. eCollection 2025 Jan 9.
Coal combustion generates soot-type air pollution, and NO, as a typical pollutant, is the main haze-causing pollutant. The degradation of NO by means of photocatalytic superhydrophobic multifunctional coatings is both durable and economical. The precipitation method was employed to create a p-n type BiOBr/α-FeO photocatalytic binary system. BiOBr/α-FeO nanoparticles were combined with polydimethylsiloxane (PDMS) in a butyl acetate solution to produce a BiOBr/α-FeO/PDMS/butyl acetate emulsion, and photocatalytic superhydrophobic coatings were then prepared using a one-step cold-spraying method. Photocatalytic oxidation experiments were conducted using a low concentration of NO as the targeted degradant. The results indicate that BiOBr/α-FeO photocatalytic heterojunctions were successfully prepared with NO removal up to 65%, indicating that the formation of p-n type heterojunctions enhances the light absorption range and improves the separation of photogenerated charge carriers. Furthermore, when the mass ratio of photocatalytic material to PDMS is 30 : 1, the photocatalytic superhydrophobic coating exhibits optimal performance, attaining a contact angle of 159.55° and NO degradation rate of 70.9%. The study also found that the photocatalytic superhydrophobic coating remained stable after undergoing cyclic degradation, acid and alkali resistance tests, and self-cleaning tests. The mechanism of photocatalytic superhydrophobic coatings was further explored, which provided new insights and a theoretical foundation for the development of self-cleaning urban environments.
煤炭燃烧会产生煤烟型空气污染，而NO作为一种典型污染物，是造成雾霾的主要污染物。利用光催化超疏水多功能涂层降解NO既耐用又经济。采用沉淀法制备了p-n型BiOBr/α-FeO光催化二元体系。将BiOBr/α-FeO纳米颗粒与聚二甲基硅氧烷（PDMS）在乙酸丁酯溶液中混合，制得BiOBr/α-FeO/PDMS/乙酸丁酯乳液，然后采用一步冷喷涂法制备光催化超疏水涂层。以低浓度NO作为目标降解物进行光催化氧化实验。结果表明，成功制备了BiOBr/α-FeO光催化异质结，NO去除率高达65%，表明p-n型异质结的形成拓宽了光吸收范围，提高了光生电荷载流子的分离效率。此外，当光催化材料与PDMS的质量比为30∶1时，光催化超疏水涂层表现出最佳性能，接触角达到159.55°，NO降解率达到70.9%。研究还发现，光催化超疏水涂层在经过循环降解、耐酸碱测试和自清洁测试后仍保持稳定。进一步探究了光催化超疏水涂层的作用机理，为城市自清洁环境的发展提供了新的见解和理论基础。
