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Electrically Controlled Adsorptive Membranes with Tunable Affinity for Selective Chromium (VI) Separation from Water
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2023-08-30 , DOI: 10.1021/acs.est.3c02751 Lie Liu 1 , Xiaoqiang An 1 , Yuqi Cui 1 , Qingwen Tang 1 , Huachun Lan 1 , Huijuan Liu 1 , Jiuhui Qu 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2023-08-30 , DOI: 10.1021/acs.est.3c02751 Lie Liu 1 , Xiaoqiang An 1 , Yuqi Cui 1 , Qingwen Tang 1 , Huachun Lan 1 , Huijuan Liu 1 , Jiuhui Qu 1
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Ionic contaminants such as Cr(VI) pose a challenge for water purification using membrane-based processes. However, existing membranes have low permeability and selectivity for Cr(VI). Therefore, in this study, we prepared an electrically controlled adsorptive membrane (ECAM-L) by coating a loose Cl–-doped polypyrrole layer on a carbon nanotube substrate, and we evaluated the performance of ECAM-L for Cr(VI) separation from water. We also used electrochemical quartz crystal microbalance measurements and molecular dynamics and density functional theory calculations to investigate the separation mechanisms. The adsorption and desorption of Cr(VI) could be modulated by varying the electrostatic interactions between ECAM-L and Cr(VI) via potential control, enabling the cyclic use of the ECAM-L without additional additives. Consequently, the oxidized ECAM-L showed high Cr(VI) removal performance (<50 μg/L) and treatment capacity (>3500 L/m2) at a high water flux (283 L/m2/h), as well as reusability after the application of a potential. Our study demonstrates an efficient membrane design for water decontamination that can selectively separate Cr(VI) through a short electric stimulus.
中文翻译：
具有可调亲和力的电控吸附膜，用于选择性从水中分离铬 (VI)
Cr(VI) 等离子污染物对采用膜工艺进行水净化提出了挑战。然而，现有膜对 Cr(VI) 的渗透性和选择性较低。因此，在本研究中，我们通过在碳纳米管基底上涂覆松散的Cl掺杂聚吡咯层制备了电控吸附膜（ECAM-L），并评估了ECAM-L分离Cr（VI）的性能。水。我们还使用电化学石英晶体微天平测量以及分子动力学和密度泛函理论计算来研究分离机制。Cr(VI) 的吸附和解吸可以通过电位控制改变 ECAM-L 和 Cr(VI) 之间的静电相互作用来调节，从而无需额外添加剂即可循环使用 ECAM-L。因此，氧化后的ECAM-L在高水通量（283 L/m 2 /h）下表现出高Cr(VI)去除性能（<50 μg/L）和处理能力（>3500 L/m 2 ）。作为应用潜力后的可重复使用性。我们的研究展示了一种用于水净化的高效膜设计，可以通过短时间的电刺激选择性地分离 Cr(VI)。
更新日期：2023-08-30
中文翻译：
具有可调亲和力的电控吸附膜，用于选择性从水中分离铬 (VI)
Cr(VI) 等离子污染物对采用膜工艺进行水净化提出了挑战。然而，现有膜对 Cr(VI) 的渗透性和选择性较低。因此，在本研究中，我们通过在碳纳米管基底上涂覆松散的Cl掺杂聚吡咯层制备了电控吸附膜（ECAM-L），并评估了ECAM-L分离Cr（VI）的性能。水。我们还使用电化学石英晶体微天平测量以及分子动力学和密度泛函理论计算来研究分离机制。Cr(VI) 的吸附和解吸可以通过电位控制改变 ECAM-L 和 Cr(VI) 之间的静电相互作用来调节，从而无需额外添加剂即可循环使用 ECAM-L。因此，氧化后的ECAM-L在高水通量（283 L/m 2 /h）下表现出高Cr(VI)去除性能（<50 μg/L）和处理能力（>3500 L/m 2 ）。作为应用潜力后的可重复使用性。我们的研究展示了一种用于水净化的高效膜设计，可以通过短时间的电刺激选择性地分离 Cr(VI)。
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