Electrified nanohybrid filter for enhanced phosphorus removal from water

Wu, Wanxiang; Zhao, Zhiyuan; Li, Mohua; Zheng, Wentian; You, Shijie; Wei, Qunshan; Liu, Yanbiao

doi:10.1016/j.chemosphere.2022.135226

Cited by 5 publications

(4 citation statements)

References 51 publications

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“…As the voltage was increased from 0 to 2 V, the current had a proportional increase, with a surface charge density at pH 7 of 0.146 mA/cm 2 . Thus, the increased kinetics for the phosphate removal in the presence of an electric field could be due to the increased near-surface electromigration as well as the greater electrostatic interactions with the sorption sites. , Additionally, anodic capacitive charging of the h-Ti 3 C 2 T x (24 h) surface could increase the stability of the adsorbed phosphates and limit desorption, leading to an increase in the kinetics for phosphate sorption. , …”

Section: Resultsmentioning

confidence: 99%

“…Electrochemical phosphate removal experiments were conducted in a commercial Whatman polycarbonate casing modified for electrochemistry . In the filtration mode, 50 mL of 5 mg P/L and 50 mg/L Na 2 SO 4 solution was recirculated sequentially through an h-Ti 3 C 2 T x filter anode and a perforated titanium sheet cathode.…”

Section: Methodsmentioning

confidence: 99%

“…35,36 Additionally, anodic capacitive charging of the h-Ti 3 C 2 T x (24 h) surface could increase the stability of the adsorbed phosphates and limit desorption, leading to an increase in the kinetics for phosphate sorption. 26,37 The physicochemical properties of h-Ti 3 C 2 T x filters and the phosphate species were closely correlated to the pH of the solution. Thus, changes in the removal of phosphate in the h-Ti 3 C 2 T x (24 h) electrofiltration mode as a function of solution pH were monitored, as shown in Figure 3d.…”

Section: Characterization Of the H-ti 3 C 2 Tmentioning

confidence: 96%

“…Electrochemical phosphate removal experiments were conducted in a commercial Whatman polycarbonate casing modified for electrochemistry. 26 In the filtration mode, 50 mL of 5 mg P/L and 50 mg/L Na 2 SO 4 solution was recirculated sequentially through an h-Ti 3 C 2 T x filter anode and a perforated titanium sheet cathode. For the kinetics investigation, recirculation tests were run at flow rate (J) values of 1.5, 4, and 6 mL/min, applied voltage (V voltage ) values of 0, 1, and 2 V, and solution pH values of 3, 7, and 9.…”

Section: Characterization Of the H-ti 3 C 2 Tmentioning

confidence: 99%

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Surface Engineering of Electrified MXene Filter for Enhanced Phosphate Removal

et al. 2023

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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 Ti 3 C 2 T x MXene (h-Ti 3 C 2 T x ) 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-Ti 3 C 2 T x filter. With a 6 mL/min recirculating flow rate, the h-Ti 3 C 2 T x 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 Ti 3 C 2 T x 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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