International Joint Research Center for Persistent Toxic Substances (IJRC-PTS), State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; Heilongjiang Provincial Key Laboratory of Polar Environment and Ecosystem (HPKL-PEE), Harbin 150090, China.
International Joint Research Center for Persistent Toxic Substances (IJRC-PTS), State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; Heilongjiang Provincial Key Laboratory of Polar Environment and Ecosystem (HPKL-PEE), Harbin 150090, China.
Sci Total Environ. 2023 Jan 15;856(Pt 2):159247. doi: 10.1016/j.scitotenv.2022.159247. Epub 2022 Oct 5.
Propylparaben (PrP) has attracted extensive concerns due to its wide occurrence in wastewater and potential health risk. Herein, nitrogen vacancy engineered reticulate g-CN (Nv-RCN) was successfully synthesized for the photodegradation of PrP. Nv-RCN exhibited larger specific surface area, greater light absorption ability, higher transfer and separation efficiency of charge carriers in comparison with bulk g-CN (CN). According to the characterization results and DFT calculation, nitrogen vacancy could capture electrons and facilitate oxygen adsorption. The Nv-RCN exhibited an outstanding PrP removal efficiency of 94.3 %, and the corresponding apparent rate constant of Nv-RCN was 3.37 times higher than that of CN. High O concentration (8 mg/L) and low pH value (pH = 3) promoted PrP photodegradation based on Box-Behnken Design. The O was the major radical during PCOP of Nv-RCN, and could oxidize PrP by decarbonylation and dealkylation. This study provided new insights to the improvement of photodegradation performance of g-CN for parabens removal and related environmental remediation.
对羟基苯甲酸丙酯（PrP）由于其在废水中的广泛存在及其潜在的健康风险而引起了广泛的关注。在此，成功合成了氮空位工程化的网状 g-CN（Nv-RCN），用于 PrP 的光降解。与块状 g-CN（CN）相比，Nv-RCN 具有更大的比表面积、更强的光吸收能力、更高的载流子转移和分离效率。根据表征结果和 DFT 计算，氮空位可以捕获电子并促进氧气吸附。Nv-RCN 对 PrP 的去除效率高达 94.3%，相应的表观速率常数是 CN 的 3.37 倍。基于 Box-Behnken 设计，高 O 浓度（8mg/L）和低 pH 值（pH=3）促进了 PrP 的光降解。在 Nv-RCN 的 PCOP 过程中，O 是主要的自由基，可以通过脱羰基和脱烷基氧化 PrP。该研究为提高 g-CN 对防腐剂去除及相关环境修复的光降解性能提供了新的思路。
