Internal Electric Field‐Modulated Charge Migration Behavior in MoS₂/MIL‐53(Fe) S‐Scheme Heterojunction for Boosting Visible‐Light‐Driven Photocatalytic Chlorinated Antibiotics Degradation

Abstract

Inadequate photo‐generated charge separation, migration, and utilization efficiency limit the photocatalytic efficiency. Herein, a MoS2/MIL‐53(Fe) photocatalyst/activator with the S‐scheme heterojunction structure is designed and the charge migration behavior is modulated by the internal electric field (IEF). The IEF intensity is enhanced to 40 mV by modulating band bending potential and the depletion layer length of MoS2. The photo‐generated electron migration process is boosted by constructing the electron migration bridge (Fe‐O‐S) and modulating the IEF as the driving force, confirmed by the density functional theory calculation. Compared with the pristine materials, the photocurrent density of MoS2/MIL‐53(Fe) is significantly enhanced 27.5 times. Contributed by the visible‐light‐driven cooperative catalytic degradation and the high‐efficiency direct photo‐generated electron reduction dichlorination process, satisfactory chlorinated antibiotics removal and detoxification performances are achieved. This study opens up new insights into the application of heterojunctions in photocatalytic activation of PDS in environmental remediation.

Highly efficient photoelectrocatalytic oxidation of arsenic(iii) with a polyoxometalate-thiacalix[4]arene-based metal–organic complex-modified bismuth vanadate photoanode

“…The E CB value (+0.18 V) of BVO is more positive than that of O 2 /˙O 2 − (−0.33 V vs . NHE), 82 while the E VB value (+2.31 V) of 1 is more negative than that of OH − /˙OH (+2.38 V vs . NHE).…”

Role of Interface of Metal–Organic Frameworks and Their Composites in Persulfate-Based Advanced Oxidation Process for Water Purification

“…HCO 3 – may interact with Co 2+ to form an inert complex, and the passivation of the active site of FeCo-BDC happened, thus limiting catalytic degradation. However, other study results indicated that the HCO 3 – could be a quencher for SO 4 •– and • OH, decreasing the concentration of active species. ,,,,,, Also, in the presence of HCO 3 – , the solution became alkaline, and PMS would be broken down to lowly active SO 5 •– . , In some special cases, low content of NaHCO 3 (5 or 10 mM) exhibited slight inhibition of bisphenol F (BPF) degradation by the PMS/Fe 3 O 4 –PVP@ZIF-67 system (poly­(vinylpyrrolidone), PVP) . HCO 3 – could consume SO 4 •– and • OH to form CO 3 •– .…”

“…•− . 65,117 In some special cases, low content of NaHCO 3 (5 or 10 mM) exhibited slight inhibition of bisphenol F (BPF) degradation by the PMS/Fe 3 O 4 −PVP@ZIF-67 system (poly(vinylpyrrolidone), PVP). 106…”

“…Thus, combining MoS 2 with Fe-MOFs is a constructive way to enhance the catalytic performance of pure Fe-MOF. Liu et al loaded different sizes of MoS 2 nanosheets onto the MIL-53­(Fe) surface using solvolysis to obtain MoS 2 /MIL-53­(Fe) composites with S-type heterojunctions, which were used to activate PDS for chloramphenicol (CAP) degradation under VL conditions . DFT calculations and differential charge density verified the electron transfer from MoS 2 to MIL-53­(Fe) in the S–O–Fe migration channel.…”

Preparation of a ZnIn2S4–AlOOH composite for the photocatalytic reduction of CO2 to CO

“…S4a †) that promotes the transfer of photogenerated electrons from ZIS to AlOOH, forming a conventional type II heterojunction, which facilitates the separation of photogenerated carriers. [37][38][39][40]…”