【摘 要】
：
Trimethoprim (TMP) is a typical antibiotic to treat infectious disease,which is among the most commonly detected antibacterial agents in natural waters and municipal wastewaters.In the present study,the impacts of dissolved oxygen (DO) on the oxidation ef
【机 构】
：
Shanghai Environmental Protection Key Laboratory for Environmental Standard and Risk Management of C
论文部分内容阅读
Trimethoprim (TMP) is a typical antibiotic to treat infectious disease,which is among the most commonly detected antibacterial agents in natural waters and municipal wastewaters.In the present study,the impacts of dissolved oxygen (DO) on the oxidation efficiency and pathways of TMP by reaction with sulfate radicals (SO4·-) were investigated.Our results revealed that the presence of DO was favourable for TMP degradation.Specifically,TMP would react initially with SO4·-via electron-transfer process to form a carbon-centered radical.In the absence of oxygen,the carbon-centered radical could undergo hydrolysis to produce α-hydroxytrimethoprim (TMP-OH),followed by the further oxidation which generated α-ketotrimethoprim (TMP=O).However,in the presence of oxygen,the carbon-centered radical would alternatively combine with oxygen,leading to a sequential reaction in which peroxyl radical and a tetroxide were formed,and finally generated TMP-OH and TMP=O simultaneously.The proposed pathways were further confirmed by density functional theory (DFT) calculations.The results obtained in this study would emphasize the significance of DO on the oxidation of organic micro-pollutants by SO4·-.
其他文献
The successful applications of two-dimensional (2D) transition metal dichalcogenides highly rely on rational regulation of their electronic properties.The nondestructive and controllable doping strategy is of great importance to implement 2D materials in
Lightweight,highly strong and bio-based structural materials remain a long-lasting challenge.Here,inspired by nacre,a lightweight and high mechanical performance cellulosic material was fabricated via a facile and effective top-down approach and the resul
Metal-organic frameworks (MOFs) with porous crystal structures have attracted extensive attention in application of energy storage and conversion,owing to their regularity,porosity,large specific surface area,etc.In this work,Co-MOF-74 microflower has bee
Low-efficiency charge transfer is a critical factor to limit the photocatalytic H2 evolution activity of semiconductor photocatalysts.The interface design is a promising approach to achieve high charge-transfer efficiency for photocatalysts.Herein,a new 2
Metal-organic frameworks (MOFs) have a regular porous structure and high porosity,which make them ideal electrode materials for supercapacitors.However,their capacitance performance is greatly limited by their poor conductivity.In this study,a multi-compo
To prevent polysulfides from dissolution into electrolyte,we propose a novel and simple approach to nitrogen-doped carbon foams which contain hierarchically porous structure and are decorated with zinc nanodots through one-pot carbonization and activation
We have developed a facile strategy to fabricate model multicolor hydrogels via a straightforward mixing process of poly acrylonitrile-grafted methacrylamide (PANMAM),polymethacrylic acid (PMAA) and doped lanthanide (Eu/Tb) and zinc ions to form the inter
The silicon-based materials are promising candidates for lithium-ion batteries owing to their high energy density.However,achieving long lifespan under realistic conditions remains a challenge because of the volume expansion and low conductivity.In this w
Ammonia (NH3) is considered an attractive candidate as a clean,highly efficient energy carrier.The electrocatalytic nitrogen reduction reaction (NRR) can reduce energy input and carbon footprint;therefore,rational design of effective electrocatalysts is e
In this paper,a novel BC3N2 monolayer has been found with a graphene-like structure using the developed particle swarm optimization algorithm in combination with ab initio calculations.The predicted structure meets the thermodynamical,dynamical,and mechan