Research Institute of Industrial Technology Convergence, Smart Textiles R&D Groups, Korea Institute of Industrial Technology, Ansan 15588, Republic of Korea; Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University, Daejeon 34134, Republic of Korea.
Research Institute of Industrial Technology Convergence, Smart Textiles R&D Groups, Korea Institute of Industrial Technology, Ansan 15588, Republic of Korea; Department of Organic and Nano Engineering, Hanyang University, Seoul 04763, Republic of Korea.
Carbohydr Polym. 2020 Apr 15;234:115881. doi: 10.1016/j.carbpol.2020.115881. Epub 2020 Jan 17.
This work reports the fabrication of a thiol-functionalized cellulose nanofiber membrane that can effectively adsorb heavy metal ions. Thiol was incorporated onto the surface of cellulose nanofibers, which were fabricated by the deacetylation of electrospun cellulose acetate nanofibers and subsequent esterification of a thiol precursor molecule. Adsorption mechanism was investigated using adsorption isotherms. Adsorption capacity as a function of adsorbate concentration was described well with Langmuir isotherm, suggesting that metal ions form a surface monolayer with a homogenously distributed adsorption energy. Maximum adsorption capacities in the Langmuir isotherm for Cu(II), Cd(II), and Pb(II) ions were 49.0, 45.9, and 22.0 mg·g, respectively. The time-dependent adsorption capacities followed a pseudo-second-order kinetic model, suggesting that chemisorption of each doubly charged metal ion occurs with two thiol groups on the surface. These results highlight the significance of surface functionality on biocompatible, nontoxic, and sustainable cellulose materials to expand their potential and applicability towards water remediation applications.
这项工作报道了一种巯基功能化纤维素纳米纤维膜的制备，该膜可以有效吸附重金属离子。巯基被引入到纤维素纳米纤维的表面，通过静电纺丝的醋酸纤维素纳米纤维的脱乙酰化和随后的巯基前体分子的酯化来制备。使用吸附等温线研究了吸附机理。吸附容量与吸附剂浓度的关系很好地符合朗缪尔等温线，表明金属离子形成具有均匀分布的吸附能的表面单层。Cu(II)、Cd(II)和 Pb(II)离子的朗缪尔等温线的最大吸附容量分别为 49.0、45.9 和 22.0 mg·g。时间依赖的吸附容量遵循伪二阶动力学模型，表明每个二价金属离子的化学吸附发生在表面的两个巯基上。这些结果突出了表面功能化对生物相容性、无毒和可持续纤维素材料的重要性，以扩大其在水修复应用中的潜力和适用性。
