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Removal of aqueous triclosan using TiO2 nanotube arrays reactive membrane by sequential adsorption and electrochemical degradation
Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2020-11-04 , DOI: 10.1016/j.cej.2020.127615
Xubin Qian , Lei Xu , Yunqing Zhu , Haiying Yu , Junfeng Niu

Removal of triclosan (TCS) in water has attracted increasing attention due to its high detection frequency and potential toxicity. In this study, porous TiO2 nanotube arrays (TiO2 NTA) was prepared as the reactive electrochemical membrane (REM) to adsorb aqueous TCS, and subsequently to degrade TCS in-situ (a regeneration process of TiO2 NTA). Adsorption kinetics and thermodynamic of TCS followed pseudo-second-order model and Langmuir model, respectively. Compared with adsorption at 0 mL min−1 (static adsorption), the initial adsorption rate and the maximum adsorption capacity increased 18.8-fold and 73.8-fold at 300 mL min−1, respectively. The optimal equilibrium absorption capacity (per projected area of TiO2 NTA) and the initial adsorption rate were 2042.92 mg m−2 and 108.51 mg m−2 min−1, respectively. In the subsequently electrochemical oxidation process, 99.8% of the adsorbed TCS was degraded in-situ and TiO2 NTA was regenerated simultaneously. TiO2 NTA electrode maintained the stable removal performance of TCS during four adsorption-degradation cycles. The adsorption process was a complex combination of the hydrophobic interaction and electrostatic interaction with/without applied voltage at different pH value. The electrochemical degradation pathways of TCS on TiO2 NTA were hydroxylation, disproportionation, dichlorination and cleavage of ether bond under the attack of electrochemical generated •OH and O2. The flow-through sequential adsorption and electrochemical degradation (SAED) based on TiO2 NTA REM were proved to be effective method to removal TCS in waters, especially for the water with low conductivity.



中文翻译:

TiO 2纳米管阵列反应膜吸附和电化学降解去除三氯生水溶液

水中三氯生(TCS)的去除由于其高检测频率和潜在毒性而引起了越来越多的关注。在这项研究中,多孔TiO 2纳米管阵列(TiO 2 NTA)被制备为反应性电化学膜(REM),以吸附水性TCS,然后原位降解TCS(TiO 2 NTA的再生过程)。TCS的吸附动力学和热力学分别遵循伪二级模型和Langmuir模型。与0 mL min -1下的吸附(静态吸附)相比,300 mL min -1下的初始吸附速率和最大吸附容量增加了18.8倍和73.8倍, 分别。最佳平衡吸收容量(TiO 2 NTA的每投影面积)和初始吸附速率分别为2042.92 mg m -2和108.51 mg m -2 min -1。在随后的电化学氧化过程中,吸附的TCS的99.8%原位降解,同时TiO 2 NTA再生。TiO 2 NTA电极在四个吸附降解循环中保持了TCS的稳定去除性能。吸附过程是疏水相互作用和静电相互作用的复杂组合,在不同pH值下施加/不施加电压。TCS在TiO 2上的电化学降解途径NTA是在电化学产生的•OH和O 2-的攻击下羟基化,歧化,二氯化和醚键的裂解。事实证明,基于TiO 2 NTA REM的流通式顺序吸附和电化学降解(SAED)是去除水中TCS的有效方法,特别是对于电导率低的水中。

更新日期:2020-11-04
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