Song Peng, Zhang Dong-Yang, Yao Xiao-Hui, Feng Fan, Wu Guo-Hua
School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, PR China.
College of Biotechnology and Sericultural Research Institute, Jiangsu University of Science and Technology, Zhenjiang, 212018, PR China.
Int J Biol Macromol. 2017 Sep;102:1066-1072. doi: 10.1016/j.ijbiomac.2017.05.009. Epub 2017 May 3.
In this work, a novel and sustainable biosorbent, regenerated silk fibroin film (rSFF) was successfully prepared and its adsorbability to azo dyes (acid yellow 11, naphthol orange and direct orange S) was measured. At optimal conditions, the adsorption capacity of rSFF for acid yellow 11 reached up to 59.71mg/g, which was 1.23-fold higher than that of raw silk fibroin fibers. More importantly, rSFF exhibited a high level of flexibility and functionality as well as a good shaping ability, which were crucial for its practical application. The SEM results showed that rSFF was a porous material, indicating that it had more available adsorption sites compared with raw silk fibroin fibers, which might contribute to the higher adsorption capacity of rSFF. Isotherm equilibrium studies revealed that the azo dye adsorption process followed the Langmuir model, indicating that rSFF was a structurally homogenous adsorbent. The recycle test showed that rSFF had potential to be reused in a number of treatment cycles. After five cycles, its adsorbability to acid yellow 11 remained as high as 47.20mg/g. Finally, a scale-up experiment was performed for rSFF, and the results indicated that it was feasible for rSFF to extend the practical application.
在本研究中，成功制备了一种新型可持续生物吸附剂——再生丝素蛋白膜（rSFF），并测定了其对偶氮染料（酸性黄11、萘酚橙和直接橙S）的吸附性能。在最佳条件下，rSFF对酸性黄11的吸附容量高达59.71mg/g，比生丝素蛋白纤维高1.23倍。更重要的是，rSFF具有高度的柔韧性和功能性以及良好的成型能力，这对其实际应用至关重要。扫描电子显微镜（SEM）结果表明，rSFF是一种多孔材料，这表明与生丝素蛋白纤维相比，它具有更多的有效吸附位点，这可能是rSFF吸附容量更高的原因。等温平衡研究表明，偶氮染料的吸附过程符合朗缪尔模型，表明rSFF是一种结构均匀的吸附剂。循环试验表明，rSFF有潜力在多个处理循环中重复使用。经过五个循环后，其对酸性黄11的吸附能力仍高达47.20mg/g。最后，对rSFF进行了放大实验，结果表明rSFF扩大实际应用是可行的。
