The NO
x
removal by scrubbing with urea–H2O2 solution after NO partial preoxidation was investigated
in detail by experiments in a spray empty absorption tower. Various
operating parameters including the liquid–gas ratio, residence
time, degree of NO oxidation, H2O2 concentration,
organo-additive concentration, absorbent solution temperature, and
PH value were tested to investigate their influences. Results indicate
that the NO
x
removal efficiency increases
with increasing of the temperature and PH value of the absorbent solution.
The addition of H2O2 can effectively enhance
the absorption of NO, and the denitrification efficiency increases
obviously when the organo-additive is used. It is relatively cost
effective to control NO oxidation degree at 50% because NO
x
can be effectively absorbed via the reaction process:
NO + NO2 + H2O → 2HNO2. The
NO
x
removal efficiency increases linearly
with increasing of the residence time and is little affected by the
liquid–gas ratio. Under the optimal test conditions, more than
75% denitrification efficiency has been achieved. The proposed denitrification
method is relatively low-cost and promising.
Antibacterial photodynamic therapy (aPDT) is a promising antibiotics‐alternative strategy for bacterial infectious diseases, which features broad‐spectrum antibacterial activity with a low risk of inducing bacterial resistance. However, clinical applications of aPDT are still hindered by the hydrophobicity‐caused inadequate photodynamic activity of conventional photosensitizers and the hypoxic microenvironment of bacterial infections. To address these problems, herein, a promising strategy is developed to achieve specific chemiluminescence (CL) imaging and enhanced PDT of bacterial infections using hemin‐modified carbon dots (H‐CDs). The H‐CDs can be facilely prepared and exhibit favorable water solubility, augmented photodynamic activity, and unique peroxidase‐mimicking capacity. Compared with the free CDs, the photodynamic efficacy of H‐CDs is significantly augmented due to the increased electron–hole separation efficiency. Moreover, the peroxidase catalytic performance of H‐CDs enables not only infection identification via bacterial infection microenvironment‐responsive CL imaging but also oxygen self‐supplied aPDT with hypoxia‐relief‐enhanced bacteria inactivation effects. Finally, the enhanced aPDT efficiencies of H‐CDs are validated in both in vivo abscess and infected wound models. This work may provide an effective antibacterial platform for the selective imaging‐guided treatment of bacterial infections.
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