supporting information (Fig. S3). Therefore, oil/waterseparation efficiency was investigated.To evaluate the oil/water separation efficiency ofC18-RS-g-PS, a mixture of chloroform/water containing heavy metal ions was poured into separationdevice including 0.5 g of C18-RS-g-PS (Fig. 11a).Because of the low surface tension, the oil is absorbedby C18-RS-g-PS at first, then penetrated and eventually collected in the collection flask (Fig. 11b). Novisible blue liquid was observed in the filtrate,indicating the efficient performance of C18-RS-g-PSfor the separation of chloroform /water mixture(Fig. 11c). After calculation, 11.54 g CHCl3 wascollected (Fig. 11d). The oil/water separationefficiency was 98.2% according to the formula wegive you before. As important criteria for practicalapplications, the recyclability and durability of theobtained superhydrophobic straw were also evaluated.After the oil/water separation experiment, the contaminated straw of C18-RS-g-PS was rinsed thoroughly by ethanol to remove the absorbed oil. Afterdried in an oven at 50 C for several hours, thesuperhydrophobicity of C18-RS-g-PS was easilyrestored (Fig. 11e). It is worth mentioning that forthe oils with lower density than water, the oil/waterseparation can also be realized (Fig. S4).As shown in Fig. 12a, the as-prepared C18-RS-gPS maintained good oil/water separation efficiency fordifferent oils. In view of environmental protection, thereusability is of great significance to meet practicalapplications (Chu et al. 2015). C18-RS-g-PS could berenewed easily by immersing the sample into theethanol solution and drying under air condition beforenext separation cycle. As shown in Fig. 12b, taking themixture of chloroform and water as an example, theC18-RS-g-PS still maintained a high separation efficiency of 98% even after 5 times of recyclingprocesses. Then the adsorption behaviors of residualheavy metal ions in the separated water was evaluatedin the second purification.
supporting information (Fig. S3). Therefore, oil/water<br>separation efficiency was investigated.<br>To evaluate the oil/water separation efficiency of<br>C18-RS-g-PS, a mixture of chloroform/water containing heavy metal ions was poured into separation<br>device including 0.5 g of C18-RS-g-PS (Fig. 11a).<br>Because of the low surface tension, the oil is absorbed<br>by C18-RS-g-PS at first, then penetrated and eventually collected in the collection flask (Fig. 11b). No<br>visible blue liquid was observed in the filtrate,<br>indicating the efficient performance of C18-RS-g-PS<br>for the separation of chloroform /water mixture<br>(Fig. 11c). After calculation, 11.54 g CHCl3 was<br>collected (Fig. 11d). The oil/water separation<br>efficiency was 98.2% according to the formula we<br>give you before. As important criteria for practical<br>applications, the recyclability and durability of the<br>obtained superhydrophobic straw were also evaluated.<br>After the oil/water separation experiment, the contaminated straw of C18-RS-g-PS was rinsed thoroughly by ethanol to remove the absorbed oil. After<br>dried in an oven at 50 C for several hours, the<br>superhydrophobicity of C18-RS-g-PS was easily<br>restored (Fig. 11e). It is worth mentioning that for<br>the oils with lower density than water, the oil/water<br>separation can also be realized (Fig. S4).<br>As shown in Fig. 12a, the as-prepared C18-RS-gPS maintained good oil/water separation efficiency for<br>different oils. In view of environmental protection, the<br>reusability is of great significance to meet practical<br>applications (Chu et al. 2015). C18-RS-g-PS could be<br>renewed easily by immersing the sample into the<br>ethanol solution and drying under air condition before<br>next separation cycle. As shown in Fig. 12b, taking the<br>mixture of chloroform and water as an example, the<br>C18-RS-g-PS still maintained a high separation efficiency of 98% even after 5 times of recycling<br>processes. Then the adsorption behaviors of residual<br>heavy metal ions in the separated water was evaluated<br>in the second purification.
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