Jang Ki Hyuk, Kang Yun Ok, Park Won Ho
Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University, Daejeon 305-764, South Korea.
Department of Nanotechnology, Chungnam National University, Daejeon 305-764, South Korea.
Int J Biol Macromol. 2014 Jun;67:394-400. doi: 10.1016/j.ijbiomac.2014.03.052. Epub 2014 Apr 3.
The cellulose acetate nanofibers containing Ag ions [CA(as-spun)] were fabricated by electrospinning a CA solution with 0-5wt% AgNO3. The CA(as-spun) was UV-irradiated to produce CA nanofibers containing Ag ions/nanopaticles (NPs) [CA(UV)], and the CA(UV) was deacetylated to cellulose nanofibers with Ag NPs [CA(UV+DA)]. When the CA(UV) was deacetylated with KOH/ethanol solution, the number and size of the Ag NPs were further increased. During the deacetylation reaction, residual Ag(+) ions in the CA(UV) seemed to be reduced by hydroxide anions in KOH/ethanol solution and Ag NPs seemed to be diffused and aggregated further in the cellulose nanofibers. The catalytic activity of cellulose-based nanofibers with different Ag contents or phases was investigated using a reduction of methylene blue (MB) as a model reaction. From a model reaction, Ag ions played an important role as a reducing catalyst of MB.
通过静电纺丝含0 - 5wt%硝酸银的醋酸纤维素（CA）溶液制备了含银离子的醋酸纤维素纳米纤维[CA（初纺态）]。对CA（初纺态）进行紫外线照射以制备含银离子/纳米颗粒（NPs）的CA纳米纤维[CA（紫外线照射）]，并将CA（紫外线照射）脱乙酰化得到含银纳米颗粒的纤维素纳米纤维[CA（紫外线照射+脱乙酰化）]。当用氢氧化钾/乙醇溶液对CA（紫外线照射）进行脱乙酰化时，银纳米颗粒的数量和尺寸进一步增加。在脱乙酰化反应过程中，CA（紫外线照射）中残留的银离子似乎被氢氧化钾/乙醇溶液中的氢氧根阴离子还原，并且银纳米颗粒似乎在纤维素纳米纤维中进一步扩散和聚集。以亚甲基蓝（MB）还原反应为模型反应，研究了不同银含量或相态的纤维素基纳米纤维的催化活性。从模型反应可知，银离子作为MB的还原催化剂发挥了重要作用。
