Abstract:

Recently, superwetting materials are widely used in oil-water emulsion separation, but there are few reports on the simultaneous separation of complex oil-water mixtures containing bacteria. To solve this problem, a comprehensive strategy of one-step O/W separation and efficient sterilization by photothermal conversion was proposed. Using melamine sponge (MS) as the substrate, chitosan (CS), CuS and polyvinylpyrrolidone (PVP) were loaded on MS by a simple two-step soaking method, and the prepared MS@CS-CuS@PVP composite sponge had superhydrophilic/underwater superoleophobic and photothermal antibacterial properties. The chemical structure and micromorphology of the material before and after modification were characterized, and the purification ability of the composite sponge to emulsion containing bacteria was studied. The results showed that the underwater oil contact angle of the composite sponge reaches 155.4^o with the addition of CuS nanoparticles, and it had the underwater superoleophobic property. Composite sponge was applied to the separation of oil-in-water emulsion, the separation efficiency was above 98.56%, and it had good chemical and mechanical stability. The high photothermal conversion performance and photothermal stability can promote the purification of the emulsion containing bacteria under light irradiation, which increased the separation flux by 22% and the sterilization rate by 18.84%. This would provide more inspirations for the separation of complex oil-water mixtures and provide new solutions to potential problems in industrial applications.

Key words: copper sulfide, composites, emulsion, separation, photothermal conversion, antibacterial

摘要：

近年来超润湿材料广泛应用于油水乳液分离，但对于含有细菌的复杂油水混合物同步分离的研究报道较少。为了解决这一问题，本文提出了一种一步O/W分离、利用光热转换高效除菌的综合策略。以三聚氰胺海绵（MS）为底材，采用简单的两步浸泡法将壳聚糖（CS）、CuS和聚乙烯吡咯烷酮（PVP）负载于MS上，制备出了具有超亲水/水下超疏油、光热抗菌性能的MS@CS-CuS@PVP复合海绵，对材料改性前后化学结构与微观形貌进行了表征，研究了复合海绵对含菌乳液净化处理能力。结果表明，CuS纳米粒子的加入使复合海绵的水下油接触角达到了155.4°，具有水下超疏油性能。将复合海绵应用于水包油乳液的分离，分离效率均在98.56%以上，且复合海绵具有较好的化学、机械稳定性。在光照条件下复合海绵表现出良好的光热转换性能及光热稳定性，能够促进含菌乳液的净化处理，使分离通量提高22%，除菌率提高18.84%。这将为分离复杂油水混合物提供更多的启示，为工业应用中的潜在问题提供了新的解决思路。

关键词: 硫化铜, 复合材料, 乳液, 分离, 光热转换, 抗菌