Pan Long, Liu Zilu, Hernandez Marcos Villeda, Schroeder Bob C, Sun Yuchen, Faul Charl F J
School of Chemistry, University of Bristol, Bristol, England BS8 1TS, U.K.
Institute for Advanced Pharmaceutical Materials, Asymchem Life Sciences (Tianjin) Co., Ltd., No.265 South Avenue, TEDA, Tianjin 300462, P. R. China.
ACS Appl Polym Mater. 2024 May 24;6(11):6416-6424. doi: 10.1021/acsapm.4c00658. eCollection 2024 Jun 14.
Efficient treatment of wastewater contaminated with carcinogenic Cr(VI) has been a long-term challenge for both academic and industrial research efforts. Removal of Cr(VI) species by ion exchange is a relatively simple and efficient method, and its combination with highly tailorable nanomaterials is promising for the treatment of such wastewater. Here, we report a type of cationic porous organic polymer (POP), namely, PTPA-PIP, which can be prepared simply by converting the corresponding aromatic polyamine PTPA to its protonated form, thereby significantly increasing its hydrophilicity and ability to disperse homogeneously in water, crucial for application in water treatment. In addition to detailed characterization of the physicochemical properties of PTPA-PIP (including using Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET), and solid-state NMR techniques), adsorption experiments demonstrate that PTPA-PIP removes low-concentration dichromate anions with very high performance, including excellent exchange capacity (maximum capacity of 230 mg CrO /g PTPA-PIP), ultrafast removal (initial adsorption rate of 83 mg g min), excellent selectivity (∼10% loss of adsorption capacity in the presence of 40-fold concentration of competing anions), as well as superior reusability (reusable for at least 5 cycles without compromised performance). These results demonstrate that PTPA-PIP is an outstanding candidate for application in industrial settings for the effective removal of harmful Cr(VI) pollutants in wastewater.
高效处理受致癌性六价铬污染的废水，一直是学术和工业研究长期面临的挑战。通过离子交换去除六价铬物种是一种相对简单且高效的方法，将其与高度可定制的纳米材料相结合，有望用于处理此类废水。在此，我们报道了一种阳离子型多孔有机聚合物（POP），即PTPA - PIP，它可以通过将相应的芳香族多胺PTPA转化为其质子化形式简单制备，从而显著提高其亲水性以及在水中均匀分散的能力，这对于水处理应用至关重要。除了对PTPA - PIP的物理化学性质进行详细表征（包括使用傅里叶变换红外光谱（FTIR）、X射线光电子能谱（XPS）、布鲁诺尔 - 埃米特 - 泰勒（BET）和固态核磁共振技术）外，吸附实验表明，PTPA - PIP能以非常高的性能去除低浓度重铬酸根阴离子，包括出色的交换容量（最大容量为230 mg CrO₄²⁻/g PTPA - PIP）、超快去除速率（初始吸附速率为83 mg g⁻¹ min⁻¹）、优异的选择性（在存在40倍浓度竞争阴离子的情况下吸附容量损失约10%）以及卓越的可重复使用性（至少可重复使用5个循环且性能不降低）。这些结果表明，PTPA - PIP是在工业环境中有效去除废水中有害六价铬污染物的杰出候选材料。
