Highly efficient chloramphenicol degradation by UV and UV/H2 O2 processes based on LED light source.
Mengyi Wu1, Yulin Tang1,2, Qianhong Liu1
1State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science & Engineering, Tongji University, Shanghai, China.
Summary
UV-LED technology effectively degrades the antibiotic chloramphenicol (CAP) in water, outperforming traditional UV lamps. Adding hydrogen peroxide (H2O2) significantly boosts CAP removal efficiency, but may form disinfection by-products.
Area of Science:
- Environmental Chemistry
- Water Treatment Technologies
- Photocatalysis
Background:
- Chloramphenicol (CAP) is a widely used antibiotic, posing environmental concerns due to its persistence in water bodies.
- Conventional UV-mercury vapor lamps have limitations in degrading recalcitrant organic pollutants like CAP.
- Ultraviolet Light Emitting Diodes (UV-LED) offer a promising, energy-efficient alternative for water disinfection and contaminant degradation.
Purpose of the Study:
- To investigate the degradation of chloramphenicol (CAP) using UV-LED irradiation as a novel light source.
- To evaluate the enhancement effect of hydrogen peroxide (H2O2) on CAP degradation efficiency.
- To assess the formation of disinfection by-products (DBPs) during UV-LED treatment of CAP-polluted water.
Main Methods:
- Degradation of CAP was studied using UV-LED irradiation, both with and without the addition of H2O2.
- Experiments evaluated the impact of initial CAP concentration, UV wavelength (optimal at 280 nm), and light intensity.
- Degradation products and potential disinfection by-products (C-DBPs and N-DBPs) were identified and quantified.
Main Results:
- UV-LED demonstrated superior CAP degradation capability compared to conventional UV-Hg lamps.
- The UV-LED/H2O2 process achieved up to 95% CAP removal within 60 minutes at pH 5.0, doubling the efficiency of UV-LED alone.
- Formation of certain disinfection by-products (e.g., TCM, DCAN, TCNM) was observed, with H2O2 significantly influencing DCAcAm formation.
Conclusions:
- UV-LED technology presents an effective and efficient method for degrading chloramphenicol in water.
- The combined UV-LED/H2O2 process offers enhanced degradation but necessitates careful consideration of DBP formation.
- Further research on health risk assessments is crucial before the practical application of UV-LED based water treatment systems.
More Related Videos
Related Concept Videos
01:14UV–Vis Spectrometers
3.1K
The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
3.1K
01:26Physical Methods for Controlling Microbial Growth: Radiation and Filtration
897
Radiation and filtration are essential tools for microbial control, targeting microorganisms through distinct mechanisms. Radiation eliminates microbes by damaging their DNA, either killing them or inhibiting their growth. Based on wavelength, radiation is classified into two types: nonionizing and ionizing radiation.Non-ionizing radiation, such as UV radiation (200–400 nm), is absorbed by DNA, causing defects that effectively disinfect surfaces, air, and water, including safety cabinets.
897