Engineering Research Center of Optical Instrument and System, Ministry of Education and Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, No. 516 Jungong Road, Shanghai 200093, China.
Standards and Quality Center of National Food and Strategic Reserves Administration, No. 25 Yuetan North Street, Xicheng District, Beijing 100834, China.
Toxins (Basel). 2023 Feb 6;15(2):133. doi: 10.3390/toxins15020133.
The degradation of aflatoxin (AF) is a topic that always exists along with the food and feed industry. Photocatalytic degradation as an advanced oxidation technology has many benefits, including complete inorganic degradation, no secondary contamination, ease of activity under moderate conditions, and low cost compared with traditional physical, chemical, and biological strategies. However, photocatalysts are usually dispersed during photocatalytic reactions, resulting in energy and time consumption in the separation process. There is even a potential secondary pollution problem from the perspective of food safety. In this regard, three electrospun membranes anchored with g-CN/MoS composites were prepared for highly efficient photocatalytic degradation of aflatoxin B (AFB) under visible light. These photocatalytic membranes were characterized by XRD, SEM, TEM, FTIR, and XPS. The factors influencing the degradation efficiency of AFB, including pH values and initial concentrations, were also probed. The three kinds of photocatalytic membranes all exhibited excellent ability to degrade AFB. Among them, the photocatalytic degradation efficiency of the photocatalytic membranes prepared by the coaxial methods reached 96.8%. The experiment is with an initial concentration of 0.5 μg/mL (500 PPb) after 60 min under visible light irradiation. The mechanism of degradation of AFB was also proposed based on active species trapping experiments. Moreover, the prepared photocatalytic membranes exhibited excellent photocatalytic activity even after five-fold use in the degradation of AFB. These studies showed that electrospun membranes anchored with g-CN/MoS composites have a high photocatalytic ability which is easily removed from the reacted medium for reuse. Thereby, our study offers a highly effective, economical, and green solution for AFB degradation in the foodstuff for practical application.
黄曲霉毒素（AF）的降解一直是食品和饲料工业中存在的问题。光催化降解作为一种高级氧化技术具有许多优点，包括完全无机降解、无二次污染、在温和条件下易于活性、与传统的物理、化学和生物策略相比成本低。然而，光催化剂在光催化反应过程中通常会分散，导致分离过程中能源和时间的消耗。从食品安全的角度来看，甚至存在潜在的二次污染问题。在这方面，制备了三种固定有 g-CN/MoS 复合材料的静电纺丝膜，用于在可见光下高效光催化降解黄曲霉毒素 B（AFB）。这些光催化膜通过 XRD、SEM、TEM、FTIR 和 XPS 进行了表征。还探讨了影响 AFB 降解效率的因素，包括 pH 值和初始浓度。这三种光催化膜都表现出了优异的降解 AFB 的能力。其中，同轴法制备的光催化膜的光催化降解效率达到了 96.8%。在可见光照射 60 分钟后，实验初始浓度为 0.5 μg/mL（500 PPb）。还基于活性物质捕获实验提出了降解 AFB 的机制。此外，即使在 5 次重复使用 AFB 降解后，制备的光催化膜仍表现出优异的光催化活性。这些研究表明，固定有 g-CN/MoS 复合材料的静电纺丝膜具有很高的光催化能力，并且易于从反应介质中去除，可用于重复使用。因此，我们的研究为食品中 AFB 的降解提供了一种高效、经济、绿色的解决方案，具有实际应用价值。
