吸附
磷酸盐
动力学
体积流量
滤波器(信号处理)
化学
电化学
化学工程
扩散
废水
环境工程
无机化学
吸附
电极
环境科学
有机化学
热力学
工程类
物理
量子力学
物理化学
计算机科学
计算机视觉
作者
Limin Jin,Yifan Ren,Wentian Zheng,Fei Pan,Shijie You,Yanbiao Liu
出处
期刊:ACS ES&T engineering
[American Chemical Society]
日期:2023-08-01
卷期号:3 (12): 2243-2251
标识
DOI:10.1021/acsestengg.3c00240
摘要
The discharge of wastewater contaminated with low concentrations of phosphate can have serious consequences, including environmentally disastrous blooms of algae and harmful concentrations of phosphate in public water sources. Herein, we demonstrate an electrofiltration system with a flow-through configuration that uses an electrified hydroxyl-terminated Ti3C2Tx MXene (h-Ti3C2Tx) filter to achieve near complete removal of ultralow concentration phosphate (5 mg P/L). Increasing either the applied voltage or the flow rate increases the phosphate sorption kinetics of the electrified h-Ti3C2Tx filter. With a 6 mL/min recirculating flow rate, the h-Ti3C2Tx filter exhibits a sorption kinetics of 1.97 h–1 and sorption capacity of 91.8 mg P/g, which was 2.6- and 4.3-fold higher than that of a pristine Ti3C2Tx filter, respectively. The enhanced electrofiltration kinetics and capacities are attributed to the synergistic effects of plentiful sites for sorption, electrochemical enhancement, and flow-through design. The mechanism for phosphate sorption combined interlayer diffusion with surface complexation at the outer level in terms of electrostatic attraction and at the inner level in terms of Ti–O–P interactions. Overall, our research elucidates the utilization of a flow-through electrified filter incorporating −OH groups that can boost the sorption kinetics and capacity for phosphate, offering a promising paradigm for efficient water purification.
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