School of Chemistry and Physics, University of KwaZulu-Natal, Westville Campus, Durban, 4000, South Africa; Department of Chemical Sciences, Olabisi Onabanjo University, P. M. B. 2002, Ago-Iwoye, Nigeria.
School of Chemistry and Physics, University of KwaZulu-Natal, Westville Campus, Durban, 4000, South Africa.
Carbohydr Polym. 2017 Nov 1;175:273-281. doi: 10.1016/j.carbpol.2017.08.008. Epub 2017 Aug 3.
We report the isolation of nanocrystalline cellulose (NCC) produced from discarded cigarette filters (DCF). The DCF were processed into cellulose via ethanolic extraction, hypochlorite bleaching, alkaline deacetylation, and then converted into NCC by sulfuric acid hydrolysis. The morphological structures of the isolated NCC established with TEM showed that the nanocrystals were needle-like with a mean length of 143nm. FEGSEM showed the morphological transition of the micro-sized DCF to self-assembled NCC while EDX revealed the presence of Ti (as TiO) in DCF, which was retained in the NCC. A NCC sample was freeze-dried and showed a specific surface area of 7.78m/g. The crystallinity of the NCC film and freeze-dried samples were 96.77% and 94.47%, respectively. Crystallite sizes of the freeze-dried (8.4nm) and film (7.6nm) samples correlated with the mean width (8.3nm) of the NCC observed under TEM.
我们报告了从废弃香烟过滤嘴 (DCF) 中分离出的纳米纤维素 (NCC)。DCF 通过乙醇提取、次氯酸盐漂白、碱性脱乙酰化转化为纤维素，然后通过硫酸水解转化为 NCC。TEM 建立的分离 NCC 的形态结构表明，纳米晶体呈针状，平均长度为 143nm。FEGSEM 显示了微尺度 DCF 向自组装 NCC 的形态转变，而 EDX 则揭示了 DCF 中存在 Ti（作为 TiO），该物质保留在 NCC 中。NCC 样品经过冷冻干燥，比表面积为 7.78m/g。NCC 薄膜和冷冻干燥样品的结晶度分别为 96.77%和 94.47%。冷冻干燥（8.4nm）和薄膜（7.6nm）样品的晶粒尺寸与 TEM 下观察到的 NCC 的平均宽度（8.3nm）相关。
