To reduce environmental pollution from dyeing wastewater, reverse micelles were prepared and used for the removal and separation of anionic Color Index (CI) Reactive Yellow 3 and cationic CI Basic Red 14 in mixed dye aqueous solution. The effect of the amount of dye and surfactant on removal rates of dyes was investigated. An ion-exchange reaction model was used to fit the experimental data. Ultraviolet-visible absorption spectra were employed to evaluate the state of dyes in mixed dye aqueous solution during the removal process. In addition, the removed dyes were recovered by back extraction and reused for dyeing fabrics. The results obtained indicated that the removal of dyes was increased with increasing the amount of surfactants, while the dye concentration exhibited the reverse trend. The dye extraction process could be described by the ion-exchange reaction equations. The mixed dyes could be removed and separated for the attractive force between dyes and the counter ionic surfactant. The mixed dyes were separated and recovered, which exhibited a good dyeing property.

To reduce environmental pollution by CI reactive red 195, solvent extraction of the dye from water was performed by using reverse micelles prepared from hexadecyltrimethylammonium bromide and amyl alcohol. The effects of dye concentration, surfactant concentration, sodium chloride concentration, and pH on the removal percentage of the dye were investigated. A pseudo-first-order kinetic model and an ion-exchange reaction model were used to fit the experimental data. Ultraviolet-visible absorption spectra and particle size distribution were analyzed to evaluate the state of the dyes in the reverse micelles. In addition, the dyes were recovered by backward extraction and then reused for dyeing cotton fabric. The removal percentage of CI reactive red 195 increased with increasing concentrations of surfactant and sodium chloride. Increasing dye concentration and pH values resulted in less removal of dyes. The dye extraction process could be described by the pseudo-first-order kinetic model and by the ion-exchange reaction equations. The state of the dye in the reverse micelles was similar to that in bulk water. The mean particle diameter of the reverse micelles was 10.8 nm. Dye recovery was improved by adding a counterionic surfactant. The recovered CI reactive red 195 had a good dyeing property for cotton fabric.

Colon cancer ranks as the third most common malignancy in the world. Combination chemotherapy, resorting to electrospun fibrous technology, has been considered as a promising strategy to exert synergistic effects in colon cancer treatment. Herein, we manufactured various pluronic F127 (PF127)-modified electrospun fibrous meshes with different weight ratios of camptothecin (CPT) and curcumin (CUR). The fluorescence characterization of the obtained PF127-CPT-meshes, PF127-CUR-meshes, and PF127-CPT/CUR-meshes (2:1) showed that CPT and CUR were evenly distributed within individual fibers of these meshes. Drug release experiments revealed that both types of drugs could be released from fibrous meshes simultaneously and sustainably. Importantly, these meshes exhibited strong in vitro anti-colon cancer activities, compared with the control meshes without drugs. Moreover, the combination index values of the PF127-CPT/CUR-meshes (CPT/CUR weight ratio = 5:1, 3:1, or 2:1) were <0.5 after incubation for respective 24 and 36 h, indicating the synergistic anti-colon cancer effects of CPT and CUR in fibrous meshes. Collectively, these results demonstrate that PF127-CPT/CUR-meshes can be developed as an efficient implantable system for effective synergistic treatment of colon cancer.