Johnson Ken I, Borges William, Sharma Priyanka R, Sharma Sunil K, Chang Hao-Yen, Abou-Krisha Mortaga M, Alhamzani Abdulrahman G, Hsiao Benjamin S
Department of Chemistry, Stony Brook University, Stony Brook, New York, NY 11790, USA.
Department of Biochemistry and Molecular Biology, Brown University, Providence, RI 02906, USA.
Nanomaterials (Basel). 2024 Mar 12;14(6):507. doi: 10.3390/nano14060507.
In this study, a sulfonation approach using chlorosulfonic acid (CSA) to prepare cellulose sulfate nanofibers (CSNFs) from raw jute fibers is demonstrated. Both elemental sulfur content and zeta potential in the CSNFs are found to increase with increasing CSA content used. However, the corresponding crystallinity in the CSNFs decreases with the increasing amount of CSA used due to degradation of cellulose chains under harsh acidic conditions. The ammonium adsorption results from the CSNFs with varying degrees of sulfonation were analyzed using the Langmuir isotherm model, and the analysis showed a very high maximum ammonium adsorption capacity (41.1 mg/g) under neutral pH, comparable to the best value from a synthetic hydrogel in the literature. The high ammonium adsorption capacity of the CSNFs was found to be maintained in a broad acidic range (pH = 2.5 to 6.5).
在本研究中，展示了一种使用氯磺酸（CSA）从生黄麻纤维制备硫酸纤维素纳米纤维（CSNFs）的磺化方法。发现CSNFs中的元素硫含量和zeta电位均随着所用CSA含量的增加而增加。然而，由于在苛刻的酸性条件下纤维素链的降解，CSNFs中的相应结晶度随着所用CSA量的增加而降低。使用朗缪尔等温线模型分析了不同磺化程度的CSNFs的铵吸附结果，分析表明在中性pH下具有非常高的最大铵吸附容量（41.1 mg/g），与文献中合成水凝胶的最佳值相当。发现CSNFs的高铵吸附容量在较宽的酸性范围内（pH = 2.5至6.5）得以保持。
