Cellulose and Paper Department, National Research Centre, 12622 Dokki, Giza, Egypt; Univ. Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38000 Grenoble, France.
Cellulose and Paper Department, National Research Centre, 12622 Dokki, Giza, Egypt.
Int J Biol Macromol. 2018 Nov;119:207-214. doi: 10.1016/j.ijbiomac.2018.07.127. Epub 2018 Jul 20.
2,3,6‑Tricarboxy cellulose nanofiber (TPC-CNFs) was prepared by 2,2,6,6-tetramethylpiperidine‑1‑oxyl (TEMPO) oxidation of dissolving cellulose pulp (selective at C-6) followed by periodate-chlorite oxidation (selective on C-2 and C-3). Characterization of the prepared samples were carried out using, atomic force microscope (AFM), carboxylate content determination, FTIR spectroscopy, X-ray diffraction and light transmittance spectra. Also, the mechanical properties of TEMPO-oxidized of cellulose nanofiber (T-CNFs) and TPC-CNFs with and without polyamide-amine-epichlorohydrin crosslinker (PAE) films were determined which the tensile strength were 8.19, 12.43 and 20.5 MPa and elastic moduli of 1814, 1097 and 1150 MPa respectively. Tricaboxy cellulose nanofiber was developed as a novel adsorbent of heavy metal ions. Removal of heavy metals such as Cu, Ca and Pb from aqueous solution was carried out and the adsorption efficiencies were analyzed. On the other hand, the effect of the addition of the crosslinking agent to CNFs and the carboxylate contents of CNFs were investigated.
2,3,6-三羧酸纤维素纳米纤维（TPC-CNFs）是通过 2,2,6,6-四甲基哌啶-1-氧自由基（TEMPO）氧化溶解纤维素纸浆（选择性在 C-6），然后用过碘酸盐-次氯酸盐氧化（选择性在 C-2 和 C-3）制备的。使用原子力显微镜（AFM）、羧酸盐含量测定、傅里叶变换红外光谱（FTIR）、X 射线衍射和透光率谱对制备的样品进行了表征。此外，还测定了 TEMPO-氧化纤维素纳米纤维（T-CNFs）和 TPC-CNFs 与聚酰胺-胺-表氯醇交联剂（PAE）的机械性能，其拉伸强度分别为 8.19、12.43 和 20.5 MPa，弹性模量分别为 1814、1097 和 1150 MPa。三羧酸纤维素纳米纤维被开发为重金属离子的新型吸附剂。进行了从水溶液中去除重金属如 Cu、Ca 和 Pb 的实验，并分析了吸附效率。另一方面，还研究了交联剂对 CNFs 的添加和 CNFs 的羧酸盐含量的影响。
