Enhanced Degradation of Carbamazepine from Constructed Wetlands with a PEC System Based on an Anode of N-TiO2 Nanocrystal-Modified TiO2 Nanotubes and an Activated Carbon Photocathode

Separations Pub Date : 2024-07-19 DOI:10.3390/separations11070216

Xiongwei Liang, Shaopeng Yu, Bo Meng, Jia Liu, Chunxue Yang, Chuanqi Shi, Junnan Ding

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Abstract

We used the Vienna ab initio Simulation Package (VASP), X-ray photoelectron spectroscopy (XPS) and diffuse reflectance (DRS) to optimize anode material for a photoelectric catalytic system. After screening how the doping of TiO2 by N and S affects its photoelectric properties, N-doped TiO2 was selected to fabricate the photoelectron catalytic (PEC) system. TiO2 nanotubes modified by N-doped TiO2 nanocrystals and activated carbon were used as an anode and as a photocathode, respectively, to decompose carbamazepine in water samples from the constructed wetlands. The calculations showed that the N-TiO2 NCs/TNTAs-AC/PTFE system had the highest content of •OH. The highest carbamazepine removal rate under the N-TiO2 NCs/TNTAs-AC/PTFE composite presence was at pH = 8, and 69% of carbamazepine was removed within 180 min of the constructed wetland water treatment at pH = 7.8. The PEC system containing modified (with nano N-TiO2) TiO2 nanotubes as an anode and activated carbon as a photocathode can effectively decompose carbamazepine in the constructed wetlands.

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基于 N-TiO2 纳米晶体修饰的 TiO2 纳米管阳极和活性炭光阴极的 PEC 系统增强了对构筑湿地中卡马西平的降解能力

我们利用维也纳自洽模拟软件包（VASP）、X 射线光电子能谱（XPS）和漫反射（DRS）来优化光电催化系统的阳极材料。在对 TiO2 的 N 和 S 掺杂如何影响其光电特性进行筛选后，选择了 N 掺杂的 TiO2 来制造光电子催化（PEC）系统。用掺有 N 的 TiO2 纳米晶体修饰的 TiO2 纳米管和活性炭分别作为阳极和光阴极来分解建湿地水样中的卡马西平。计算结果表明，N-TiO2 NCs/TNTAs-AC/PTFE 系统中的 -OH 含量最高。pH = 8 时，N-TiO2 NCs/TNTAs-AC/PTFE 复合材料对卡马西平的去除率最高，pH = 7.8 时，在构建湿地水处理后的 180 分钟内，69% 的卡马西平被去除。含有改性（纳米 N-TiO2）TiO2 纳米管作为阳极、活性炭作为光阴极的 PEC 系统可有效分解构建湿地中的卡马西平。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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