8 research outputs found
Structural properties and Raman spectroscopy of lipid Langmuir monolayers at the air-water interface
Spectra of octadecylamine (ODA) Langmuir monolayers and egg
phosphatidylcholine (PC)/ODA-mixed monolayers at the air-water interface have
been acquired. The organization of the monolayers has been characterized by
surface pressure-area isotherms. Application of polarized optical microscopy
provides further insight in the domain structures and interactions of the film
components. Surface-enhanced Raman scattering (SERS) data indicate that
enhancement in Raman spectra can be obtained by strong interaction between
headgroups of the surfactants and silver particles in subphase. By mixing ODA
with phospholipid molecules and spreading the mixture at the air-water
interface, we acquired vibrational information of phospholipid molecules with
surfactant-aided SERS effect.Comment: 8 pages, 9 figure
Enhanced Mass Transfer of Ozone and Emerging Pollutants through a Gas–Solid–Liquid Reaction Interface for Efficient Water Decontamination
Ozone (O3), as an environmentally friendly
oxidant,
is widely used to remove emerging pollutants and ensure the safety
of the water supply, whereas the restricted accessibility of O3 and limited collision frequency between pollutants and O3 will inevitably reduce the ozonation efficiency. To promote
the chemical reactions between O3 and target pollutants,
here we developed a novel gas–solid–liquid reaction
interface dominated triphase ozonation system using a functional hydrophobic
membrane with an adsorption layer as the O3 distributor
and place where chemical reactions occurred. In the triphase system,
the functional hydrophobic membrane simultaneously improved the interface
adsorption performance of emerging pollutants and the access pathway
of O3, leading to a marked enhancement of interfacial pollutant
concentration and O3 levels. These synergistic qualities
result in high ciprofloxacin (CIP) removal efficiency (94.39%) and
fast apparent reaction rate constant (kapp, 2.75 × 10–2 min–1) versus
a traditional O3 process (41.82% and 0.48 × 10–2 min–1, respectively). In addition,
this triphase system was an advanced oxidation process involving radical
participation and showed excellent degradation performance of multiple
emerging pollutants. Our findings highlight the importance of gas–solid–liquid
triphase reaction interface design and provide new insight into the
efficient removal of emerging pollutants by the ozonation process