4.2. Apparatus
The photoelectrochemical test system (PEC1000, Beijing Perfectlight
Technology Co., Ltd., China), equipped with a Xe lamp (PLS-FX300HU,
Beijing Perfectlight Technology Co., Ltd., China) and an electrochemical
workstation (CHI 760E, Shanghai Chenhua Instrument Co., Ltd., China),
was employed for PEC measurements. The base SPE electrodes were
purchased from Shenzhen Yick Xin Technology R&D Co., Ltd. (Shenzhen,
China). The working electrode (2 mm diameter) was composed of vertical
graphene with surface-deposited Au NPs. The reference electrode employed
was Ag/AgCl, and the counter electrode consisted of carbon paste.
SEM (SU-70, Hitachi Co., Tokyo, Japan) was utilized to perform
morphological characterization of the electrode. Energy dispersive
spectroscopy (EDS; EX-250, Horiba, Kyoto, Japan) was employed to
characterize the distribution of chemical elements at the electrode
interface. A surface analysis system (AXIS Ultra-DLD, Kratos Analytical,
Manchester, U.K.) equipped with
monochromatic Al Kα (1486.6 eV) radiation was utilized for
conducting XPS analysis. The automated robot (Shennong-1, Shenzhen
Metasensing Technology Co., Ltd., China) was used for sewage sampling,
enrichment, concentration, nucleic acid extraction, and reverse
transcription.