NanoBio High-Tech Materials Research Center, Department of Biological Sciences and Bioengineering, Inha University, 100 Inha-ro, Incheon, 22212, Republic of Korea.
Department of Biological and Environmental Engineering, Semyung University, Jecheon, 27136, Republic of Korea.
Chemosphere. 2024 Sep;364:143051. doi: 10.1016/j.chemosphere.2024.143051. Epub 2024 Aug 8.
In this study, acid-modified activated carbon fibers (ACF-Ps) were synthesized by phosphorylation. Three different types of ACF-based adsorbents functionalized with PO, PO, or PO ions, namely, ACF-P1, ACF-P2, and ACF-P3, were prepared by phosphorylating ACF with trisodium phosphate (NaPO), sodium dihydrogen pyrophosphate (NaHPO), and sodium tripolyphosphate (NaPO), respectively, and utilized as adsorbents to remove cesium ions (Cs) from aqueous solutions. Among the tested adsorbents, ACF-P3 exhibited the highest Cs adsorption capacity of 37.59 mg g at 25 °C and pH 7 which is higher than that of ACF (5.634 mg g), ACF-P1 (19.38 mg g), and ACF-P2 (30.12 mg g) under the same experimental conditions. More importantly, the Cs removal efficiencies of ACF-P3 (82.90%), ACF-P2 (66.2%), ACF-P1 (34.2%) were 29.3-, 23.4-, and 12.11-fold higher than that of un-treated ACF (2.83%). The results suggested that the phosphorylation with NaPO is highly suitable for Cs adsorption which effectively functionalizes ACF with a greater number of phosphate functional groups. Adsorption and kinetic data well-fitted the Langmuir isotherm and pseudo-second-order model, respectively, which indicated the monolayer adsorption of Cs onto ACF-P1, ACF-P2, and ACF-P3 which were largely controlled by chemisorption. Overall, phosphoric acids containing different phosphate-based polyanions (PO, PO, or PO) enriched -OH and/or -COOH surface functional groups of ACF in addition to P-containing surface groups (PO, C-P-O, C-O-P, and P-O) and facilitated the Cs adsorption through surface complexation and electrostatic interactions.
在这项研究中，通过磷酸化合成了酸改性的活性碳纤维（ACF-Ps）。通过用磷酸三钠（NaPO）、焦磷酸二氢钠（NaHPO）和三磷酸钠（NaPO）分别对活性碳纤维进行磷酸化，制备了三种不同类型的 PO、PO 或 PO 离子功能化的基于 ACF 的吸附剂，即 ACF-P1、ACF-P2 和 ACF-P3，并将其用作吸附剂从水溶液中去除铯离子（Cs）。在测试的吸附剂中，ACF-P3 在 25°C 和 pH 7 下表现出最高的 Cs 吸附容量为 37.59mg g，高于相同实验条件下的 ACF（5.634mg g）、ACF-P1（19.38mg g）和 ACF-P2（30.12mg g）。更重要的是，ACF-P3（82.90%）、ACF-P2（66.2%）和 ACF-P1（34.2%）的 Cs 去除效率分别比未处理的 ACF（2.83%）高 29.3、23.4 和 12.11 倍。结果表明，用 NaPO 进行磷酸化非常适合 Cs 吸附，它有效地用更多的磷酸官能团官能化 ACF。吸附和动力学数据分别很好地符合朗缪尔等温线和准二级模型，这表明 Cs 单层吸附到 ACF-P1、ACF-P2 和 ACF-P3 上，主要由化学吸附控制。总的来说，含有不同的磷酸多阴离子（PO、PO 或 PO）的磷酸在 ACF 上除了含 P 的表面基团（PO、C-P-O、C-O-P 和 P-O）外，还富集了-OH 和/或-COOH 表面官能团，并通过表面络合和静电相互作用促进了 Cs 的吸附。
