Talos f200x transmission

The surface morphologies of ZIF-8 and ZIF-8@PAc were observed using a scanning electron microscope (SEM) (Zeiss, Germany). Transmission electron microscopy (TEM) images were recorded using an FEI Talos F200X transmission electron microscope. The zeta potentials of PAc, ZIF-8, and ZIF-8@PAc were recorded using a Zetasizer Nano ZS (Malvern, UK). The UV-visible (UV-Vis) absorption spectra were measured with a UV-3100 spectrophotometer (Mapada, China). Flow cytometry was performed using a BD FACSAria III flow cytometer (NJ, USA).

The crystal structure
of the samples was determined by a Bruker D8 Advance X-ray diffractometer
(XRD) using Cu Kα radiation (λ = 1.5418 Å) at instrument
settings of 40 kV and 40 mA. The elemental and functional group compositions
of the samples were analyzed by Thermo Fisher Scientific ESCALAB 250Xi
X-ray photoelectron spectroscopy (XPS), using Al Kα excitation
radiation (25 W, hν = 1486.5 eV) and 1 eV energy
resolution. Composite morphology was analyzed with a FEI Talos F200X
transmission electron microscope (TEM) operating at an accelerating
voltage of 200 kV, whereas the localized elemental mapping was screened
by high-angle annular dark-field scanning transmission electron microscopy
(HAADF-STEM). FEI model QuantaFEG 650 scanning electron microscopy
(SEM) with 5 kV acceleration voltage and Bruker EDS energy-dispersive
X-ray spectroscopy were also used for morphology study and element
visualization. The ultraviolet–visible (UV–vis) absorbance
spectra were collected using a Jasco V-670 UV–visible spectrophotometer.
The photoluminescence (PL) spectra were investigated by a PL spectrometer
(Horiba, iHR 320, MicOS) with an excitation wavelength of 325 nm.
The concentration of organic carbon in the wastewater was analyzed
using a combustion-type total organic carbon analyzer (Shimadzu, model
TOC-L, Japan).