In recent years, waste mobile phones have become popular as electronic waste due to the huge amount, serious pollution with improper disposal and high resource value. It is imperative to realize the recycling of resources in waste mobile phones. The application of emulsion liquid membrane in the recovery of gold and synthesis of nanomaterials from waste mobile phone printed circuit boards (WMPCBs) was studied. The components of the emulsion liquid membrane, effects of 7 factors on the extraction rate and the morphology of the synthesized nanomaterials were explored. The results show that it is possible to extract 99.79% of Au(III) from WMPCBs leachate with kerosene as diluent, Span80 as surfactant, methyl isobutyl ketone(MIBK) as carrier, ascorbic acid solution as stripping agent and liquid paraffin as membrane stabilizer. The external phase pH and the internal phase concentration had a greater influence on the extraction efficiency of Au(III) among 7 factors. The morphology of the synthesized product was affected by the concentration and type of the surfactant. It provides a new idea to connect recovery from waste with deep processing, extending the waste mobile phone recycling process chain and achieving high-value utilization of waste mobile phone secondary metal resource products.
The gelatin/gellan gum based-bilayer emulsion film was developed in this work to improve the survivability of Bifidobacterium longum during the storage process. The baobab seed oil (BO) was added to the gelatin (GE) matrix to develop emulsion film as the barrier outer layer. The blueberry anthocyanin extract (BE) was incorporated into the gellan gum (GG)-based inner layer to enhance the viability of B. longum . The SEM and FTIR results revealed that the probiotics were successfully entrapped in BO/BE-loaded bilayer film. The greatest survivability and viable cell numbers of the B. longum during the storage period were observed in the BO/BE loaded bilayer film. Furthermore, the stability of the colorful patterns by electrochemical writing was also evaluated in this work. Finally, the GE/BO-GG/BE/BM maintain satisfactory probiotic viability in steamed bread coating application. Hence, the GE/BO-GG/BE/BM bilayer film could be considered a novel material to deliver and protect the probiotics in food applications.
In order to explore the effects of oil's melting points on film performance, a gelatin emulsion film with different degrees (8°, 18°, 24°, 33° and 44°, referring to different melting points) of commercial palm oils were fabricated and its properties were investigated. A variety of size distribution (d 4,3 and d 3,2 ) of oil droplets in film-forming emulsion was observed, with 24° oil being the smallest and most regular. As expected, the addition of palm oil obviously decreased film strength but increased elongation, depending upon oil degree. Among them, more importantly, strength of the film containing 24° palm oil was close to that of the pure gelatin film, coexisting with a satisfied elongation value. Furthermore, reducing water vapor permeability was observed in all emulsion films, wherein film containing 24° oil was lowest. Increasing degrees of palm oil led to an increase in film's opacity and a variation of film color, as well as thermal stability. The aforementioned different effects were consistent with microstructure of the emulsion films, where the film with 24° oil droplets was smoother and compact. In conclusion, the melting point of palm oil had a remarkable influence on properties of the resulting emulsion film, mainly being attributed to the differences in size and related state of oil droplets in emulsion during film processing.
危险品化学品经营许可证（带存储）