Assistance Of Visible Light Research Articles

Ultra-thin carbon nitride activated periodate for efficient tetracycline degradation with the assistance of visible light

This study developed a novel activated periodate (PI, IO4−) system mediated by ultra-thin carbon nitride (UCN) and visible light (Vis), and investigated its efficiency and kinetics of tetracycline hydrochloride (TC) degradation in water. UCN/PI/Vis system could remove 96% TC within 16 min through the mixed radical/non-radical pathway dominated by IO3•, 2.3 times higher than that of polymerized carbon nitride (PCN)/PI/Vis system. This gap was attributed to UCN having a greater specific surface area, more active sites, and a shorter charge transfer path. The UCN/PI/Vis system has outstanding recyclability, attractive pH adaptability, and remarkable tolerance to co-existing substances and natural water bodies. The fascinating degradation efficiency was ascribed to the synergistic effect among UCN that produced photoelectrons, TC as an electron donor, and PI as an electron acceptor. The quantum confinement effect of the ultra-thin structure improved the band gap and enhanced the redox capacity of photogenerated carriers, which greatly improved the photocatalytic activation of PI by UCN.

A novel cobalt-based coordination polymer for rapid degradation of organic dyes in water by visible light assistance

It is crucial to construct an effective photocatalyst for the removal of dyes from aqueous environments. In the present work, a novel cobalt-based coordination polymer was synthesized and characterized with the molecular formula [Co(ipa)(ptt)]n (Co-CP), (ipa = isophthalic acid, ptt = 5-(4-Pyridyl)-1H-tetrazole). In Co-CP, each cobalt ion is in a six-coordination mode and is connected to two adjacent ligands to form a three-dimensional network structure. Furthermore, Co-CP excellent degradation properties and can effectively degrade methylene blue (MB) and rhodamine B (Rh B) under visible light with degradation efficiencies of 84.3 % and 94.6 %, respectively. Additionally, its PXRD patterns and FTIR spectra remained consistent with the original complex after three cycles, which proved that it was very stable, and there was no significant decrease in degradation ability after three cycling cycles, indicating its excellent reusability. The photocatalytic degradation mechanism was subsequently rationalized through free radical trapping experiments and analysis the energy band structure of Co-CP.

Enhanced degradation of ofloxacin by activation of peroxymonosulfate with biochar-FeVO4 under visible light assistance: The role of biochar in mediating charge transfer and mechanism insight

Biochar is recognized as a good medium for promoting photogenerated charge separation in photocatalysts. In this study, the FeVO4/coconut shell biochar (CSB) composites (FVC) were prepared through a cost-effective hydrothermal approach to activate peroxymonosulfate (PMS) for the degradation of ofloxacin (OFX). Incorporated CSB expanded the light absorption range of FVC by approximately 100 nm, and the band gap energy of FVC was reduced to 2.00 eV. Measurements through linear scanning voltammetry (LSV) and current–time (IT) chronoamperometric further confirmed that the accelerated electron transmission rate boosted PMS oxidation, which was attributed to the role of CSB acting as a mediator. Importantly, OFX degradation was significantly boosted by CSB, FV, and PMS synergistically. FVC had a significant OFX degradation efficiency under visible light irradiation (95.2 %) compared to FV (70.9 %), CSB (57.8 %) and PMS (30.5 %). Moreover, the h+, 1O2, ·O2–, ·OH, and SO4·− were the main active species, whose degradation pathways were explored and the toxicity of the intermediates was assessed. Furthermore, the as-obtained FVC exhibited a remarkable stability and reusability. This work provides new insights into the mechanism of biochar-mediated charge transfer for antibiotic degradation.

Improved photocatalytic performance of CdS/α-Fe2O3 heterostructure for anionic dye mineralization and charge storage applications

The present work focuses on the photocatalytic mineralization of Acid violet 7 (AV7) dye with visible light assistance and the electrochemical functionality of synthesized CdS/α-Fe2O3 (85CF) heterostructure for energy storage applications. The prepared CdS/α-Fe2O3 heterostructure shows enhanced absorption of visible light compared to pristine CdS. Photoluminescence (PL), fluorescence lifetime, and electrochemical studies suggest improved charge separation in the optimized 85CF heterostructure catalysts compared to pure components. Electrochemical studies reveal improved capacitance, reduced charge transfer resistance, and superior charge–discharge behavior in optimized 85CF heterostructure catalysts compared to pristine components and other prepared composites. The improved photocatalytic activity was achieved by 85CF heterostructure catalysts for a higher concentration of AV7 dye (85 mg L−1) degradation. The major reactive oxygen species (ROS) were investigated, and a possible reaction pathway was presented. TOC analysis suggests mineralization occurs during the degradation reaction. The optimized 85CF heterostructure shows a higher specific capacitance of 938 F/g at 1.0 A/g of current density. A greater capacity retention of 99.02% was achieved with the 85CF heterostructure after 2000 continuous charge/discharge cycles.

Enhanced activation of peroxymonosulfate by a floating Cu0-MoS2/C3N4 photocatalyst under visible-light assistance for tetracyclines degradation and Escherichia coli inactivation

Transition metal-based photocatalysts have recently attracted much attention in photo-induced Peroxymonosulfate (PMS) activation systems. Herein, a novel floating catalyst Cu0-MoS2/C3N4-expanded graphite (Cu-MSCN-EG) was prepared by a chemical reduction method and applied as a PMS activator to remove tetracyclines (TCs) and inactivate Escherichia coli under visible light irradiation in aqueous solution. Over 99.0 % of TCs and Escherichia coli could be removed and inactivated within 1 h in Vis/PMS/Cu-MSCN-EG system. Compared to the MoS2/C3N4-EG system, the loading of zero-valent copper in the Vis/PMS/Cu-MSCN-EG system increased the reaction rate by 278 %. Raman spectroscopy and density functional theory (DFT) calculations indicated that ·OH and 1O2 were generated via two different adsorption patterns between PMS and copper (≡Cu+-OSO3-–OH and ≡Cu+–OH-OSO3-). With the light assistance, the photo-induced electrons reduced the copper leaching and enhanced the generation of ·SO4- and ·O2–, leading to a high recyclability and mineralization rate. Overall, this study provides a new insight into the fabrication of copper-based PMS activator with high efficiency and durability for contaminants degradation and pathogen inactivation.

Efficient heterostructure of CuS@BiOBr for pollutants removal with visible light assistance

The Z-scheme heterojunction photocatalyst CuS@BiOBr was fabricated by precipitating BiOBr on CuS nanoparticles. The experimental results showed that CuS@BiOBr system showed high efficiency in the photocatalytic degradation of ciprofloxacin (CIP) compared with BiOBr and CuS. Catalyst application in realistic wastewater: CIP of removal ratio was 86.49%, 76.95%, 78.58% and 75.11% in DI water, tap water, lake water (longitude123.701077, latitude 41.453335) as well as river water (longitude 123.701710, latitude 41.453070), separately. These results show that CuS@BiOBr-700 can be effectively used for the photocatalytic removal of ciprofloxacin contaminants in the environment. • Composite catalyst of CuS@BiOBr was synthesized through a two-step hydrothermal method. • The CuS@BiOBr exhibited enhanced activity for CIP oxidation under visible-light. • Visible light response enhancement effect of CuS was demonstrated. • Composite catalyst of CuS@BiOBr has superior durability. Constructing the Z-scheme photocatalyst has been seen as an effective strategy to facilitate the removal of antibiotic contamination by photocatalysts. We constructed the Z-type heterojunction photocatalyst CuS@BiOBr by precipitating BiOBr on CuS nanoparticles. The experimental results showed that the CuS@BiOBr in comparison to BiOBr and CuS system exhibited highly efficient photocatalytic degradation of ciprofloxacin (CIP). The degradation rate of CIP under CuS, BiOBr and CuS@BiOBr-700 heterojunction were 19.28%, 53.26% and 86.49%, respectively. The structure, morphology, porosity, optical performance and photoelectrochemical properties of CuS@BiOBr were characterized by multifarious characterization methods. The influence of environmental factors (different water sources and initial pH) on the degradation of ciprofloxacin (CIP) was investigated. A Z-scheme charge transfer mechanism was confirmed by free radical trapping experiments, which demonstrated that the photoexcited holes (h + ) and superoxide radicals (⋅O 2 ¯ ) were the major active species.

Activated Single-Phase Ti4 O7 Nanosheets with Efficient Use of Precious Metal for Inspired Oxygen Reduction Reaction.

The oxygen reduction reaction (ORR) is central to modern energy storage and conversion technologies for grids such as fuel cells and electrolyzers, but challenges remain due to the lack of reliable, economic, and durable electrocatalysts. Here, we develop single-crystal conductive black titanium (Ti4 O7 ) nanosheets (NSs) as a new precious metal carrier based on sacrificial hard templates and ultrasonic-assisted peeling, and deposit Pt clusters on Ti4 O7 NSs induced by wetness impregnation under the irradiation of visible light (VI; 650 nm). Pt/Ti4 O7 NSs provide Ti3+ , Pt2+ , and Pt0+ continuous active sites for the ORR multielectron process, achieving synergy among them. The assistance of visible light not only makes a more uniform and smaller distribution of Pt nanoclusters, but also strengthens the charge transfer, thereby constructing a strong metal-support interaction interface. VI-Pt/Ti4 O7 NSs show superior initial oxidation potential and a mass activity of 1.61 A mg-1 Pt at a E1/2 =0.91 V, which is nine times higher than that of commercial Pt/C. This work provides an effective strategy for achieving high-value applications of titanium sub-oxides and further explores the enhanced interface in metals Tin O2n-1 by light radiation.

Enhanced activation of peroxymonosulfate by a floating FeMo3Ox/C3N4 photocatalyst under visible-light assistance for oxytetracycline degradation: Performance, mechanisms and comparison with H2O2 activation

In this study, a floating FeMo3Ox/C3N4-EP (FM-C-P) composite with highly stability and reusability was synthesized by an impregnation/calcination process and used to activate peroxymonosulfate (PMS) for oxytetracycline (OTC) degradation under visible light irradiation. The results demonstrated that 98.1% of OTC (50 mg/L) removal can be achieved by the activation of PMS (5 mM) using FM-C-P (1 g/L) in 30 min under visible light irradiation. The pseudo-first-order rate constant was calculated to be 0.181 min−1. The degradation process with PMS was hardly affected by pH (3–11) and co-existing substance. ·SO4−, ·OH, ·O2− and 1O2 were produced in the Vis/PMS/FM-C-P system and 1O2 was determined to be the main reactive oxygen species (ROSs). The high efficiency of ROSs production mainly contributed to two mechanisms. Firstly, via the combination of ≡Fe (II)-·SO5− and free state ·SO5−, 1O2 could be generated on the Fe-Nx site. Secondly, photo-induced electrons in the FeMo3Ox/g-C3N4 heterojunction could react with Fe (III) and Mo (VI) to form catalytically active species Fe (II) and Mo (IV). Moreover, the proposed degradation pathway and the toxicity of intermediated products was analyzed. Overall, this study was expected to deepen the understanding of the photo-assisted PMS activation and the generation of 1O2 with the presence of metal-oxide/C3N4 heterojunction.

Activation of Na2S2O8 by MIL-101(Fe)/Co3O4 composite for degrading tetracycline with visible light assistance

• MIL-101(Fe) and Co 3 O 4 composites (MIL-101(Fe)/Co 3 O 4 ) were tested as catalysts. • Heterogeneous catalysis system with Na 2 S 2 O 8 and Vis light degrades tetracycline (TC) • Quenching experiments showed that 1 O 2 , •SO 4 ‾, •OH, and O 2 ‾ led to removal of TC. MIL-101(Fe)/Co 3 O 4 composites were synthesized using a facile solvothermal method to establish the superiority of a heterogeneous photochemical catalysis system in the presence of Na 2 S 2 O 8 with visible light irradiation. In the present system, the MIL-101(Fe)/Co 3 O 4 catalyst showed better catalytic performance than the single photocatalytic or chemical catalytic system, implying that the MIL-101(Fe)/Co 3 O 4 catalyst can combine both photocatalysis and chemical catalysis well. When tetracycline (TC) is the target pollutant, the highest degradation efficiency can be achieved within 40 min, reaching to 86 %. Crystallinity, morphology, and elemental valence of the MIL-101(Fe)/Co 3 O 4 composite were explored by using X-ray diffraction (XRD), scanning electron microscopy (SEM) as well as X-ray photoelectron spectroscopy (XPS). From the quenching experiments, it was found that 1 O 2 , SO 4 ‾, OH, and O 2 ‾ make contributions to the effective removal of tetracycline. Apart from that, the recovery and reuse characteristics of MIL-101(Fe)/Co 3 O 4 may facilitate the sustainable wastewater treatment.

Activation of Na2S2O8 by MIL-101(Fe)/MoS2 composite for the degradation of tetracycline with visible light assistance

In this paper, MIL-101(Fe) and MoS2 composites (MIL-101(Fe)/MoS2) were synthesized using a facile solvothermal method. As a new degradation system, the synthesized composites were investigated using persulfate (PS) activation based on visible light (Vis). To establish the superiority of a heterogeneous photochemical catalysis system, the MIL-101(Fe)/MoS2 was used as the catalyst in the presence of Na2S2O8 with visible light irradiation. In the system mentioned, the MIL-101(Fe)/MoS2 catalyst presented a much better catalytic ability than that of either a single photocatalysis or chemocatalysis system. The better catalytic ability suggests that the MIL-101(Fe)/MoS2 catalyst was capable of effectively integrating photocatalysis and chemocatalysis leading to the highest degradation efficiency of 85% in 40 min with tetracycline as the target pollutant. The catalytic system MIL-101(Fe)/MoS2/PS/Vis degraded TC pollutant by forming species of O2‾, 1O2, hydroxyl radicals (•OH) and sulfate radicals (•SO4‾) to degrade TC. Furthermore, the MIL-101(Fe)/MoS2 catalyst displayed better catalytic performance compared to those materials that were previously reported, as verified by the good stability (reached 80% after three cycles) and the high TC degradation rate (85%) of the currently developed material. This system may be applicable to the degradation of TC and other challenging organic pollutants.

Expeditious degradation of SMX by high-valent cobalt-oxo species derived from cobalt-doped C3N5-activated peroxymonosulfate with the assistance of visible light

With excellent photoelectric properties and catalytic stability, carbon nitride and its derivatives are drawing increasing interest in persulfate activation for treating emerging pollutants in wastewater. In the present work, the synthesized cobalt-doped C3N5 (C3N5-Co) has well-defined surface properties and excellent performance in SMX degradation by activating peroxymonosulfate (PMS) with the assistance of visible light, and the removal rate can reach 99.57 % within 20 min. Moreover, the system shows superior operability over a wide pH range with promising catalytic stability and environmental suitability. Quenching experiments and EPR spectroscopic indicated that high-valent cobalt oxide (Co(IV)) species, SO4•-, •OH, O2•-, and 1O2 work in C3N5-Co0.59/PMS/SMX-vis combined system. The conversion of the oxidation product phenyl methyl sulfoxide (PMSO2) > 98 % using phenyl methyl sulfoxide (PMSO) as a probe agent demonstrated that high-valent cobalt oxide (Co(IV)) species as the major active species dominated the degradation process of SMX. The Co(II) species on the surface of C3N5-Co0.59 worked as a direct driver to rapidly and efficiently activate the PMS, producing various active species involved in the degradation process, while the photo-carriers generated by visible radiation act as another contributing force to regenerate Co(II) species and activate PMS. This study presented the heterogeneous C3N5-Co0.59/PMS/SMX-vis system is an effective strategy for the degradation of emerging pollutants and provides a promising novel ideal for the treatment of various organic pollutants in wastewater.

Miraculous dye-photosensitization-assisted peroxymonosulfate activation at the carbon nitride interface: Enhanced activity and synergistic mechanism

Heterogeneous activation of peroxymonosulfate (PMS) with the assistance of visible light is an emerging technology for organic wastewater decontamination. However, such a combined system is often affected by the inherent characteristics of the target pollutants and photocatalyst or may suffer from undesirable photoactivity, metal precipitation, catalyst deactivation, and increased toxicity. In this study, typical carbon nitride (g-C3N4) nanosheets were selected as a catalytic reaction interface, and photosensitive rhodamine B (RhB) served as the model pollutant to achieve pollutant-driven oxidant activation using PMS, and nearly 7.7 times compared to the single g-C3N4/vis system was thus achieved. Capture experiments and electron spin resonance (ESR) analyses verified the major contribution of superoxide radical (•O2–) and its subspecies singlet oxygen (1O2) to the enhanced catalytic performance. Theoretical calculations showed that the RhB molecule could be excited to form RhB* under visible light, transferring e- to the conduction band of g-C3N4, and thereby PMS was rapidly activated by accumulated electrons. This work highlights the role of photosensitization in the treatment of complex organic wastewater.

Novel 0D-1D-2D nanostructured MCN/NCDs recyclable composite for boosted peroxymonosulfate activation under visible light toward tetracycline degradation

In this study, a novel nitrogen modified carbon quantum dots (NCDs) decorated graphite carbon nitride /molybdenum (Mo) heterojunction photocatalyst (MCN/NCDs) was obtained by in-situ calcination and physical deposition, and applied as peroxymonosulfate (PMS) activators for tetracycline (TC) removal under visible light. It was found that the MCN/NCDs as PMS activation catalyst exhibited outstanding removal efficiency under visible light assistance and nearly 98.4% of TC was degraded within 60 min. The analysis data of photochemistry demonstrated that the introduction of NCDs could significantly improve the visible-light utilization, narrow the band gap and increase the separation of photogenerated electron-hole pairs. The results of radical capture experiment and electron spin resonance test (ESR) suggested that the order of active species contributing to TC degradation in vis/PMS/MCN/NCDs system was O2– > h+>OH > 1O2 > SO4−. Moreover, the MCN/NCDs composite exhibited excellent stability with over 98% activity retention for 5 cycles and superior catalytic efficiency in four real water matrix. Finally, the underlying degradation mechanism and toxicity assessment were proposed in detail. This work provided a new perspective on the design of excellent activity g-C3N4 composite catalysts and elucidated a promising potential strategy for efficient contaminated water treatment via PMS activation process.

Efficient activation of K2S2O8 by MoS2-ZnFe2O4 composite for the rapid degradation of tetracycline

The MoS2-ZnFe2O4 composite catalyst was fabricated by a hydrothermal method and applied to decompose tetracycline (TC) by activating persulfate (PS) with the assistance of visible light (Vis). The TC elimination efficiency of MoS2-ZnFe2O4 catalyst reached 84.5% within 30 min, which was much higher than that of either MoS2 or ZnFe2O4 alone and this catalyst demonstrated satisfactory catalytic performance over a wide pH range (3–9) for the removal of TC. The improved efficiency of TC degradation can be attributed to the production of highly active free radicals such as •OH, SO4•-, and O2•-. In addition, the catalyst showed favorable stability and recyclability when tested in three consecutive cycles.

Activation of Na2s2o8 by Mil-101(Fe)/Mos2 Composite for the Degradation of Tetracycline with Visible Light Assistance

Activation of Na2s2o8 by Mil-101(Fe)/Mos2 Composite for the Degradation of Tetracycline with Visible Light Assistance

Unusual hexa-nuclear cadmium cluster functionalized phosphomolybdate as effective photoelectrochemical sensor for trace Cr(VI) detection

Photo-assisted electrochemical technique provides a promising approach towards carcinogen chromium(VI) detection, which requires reasonable catalyst design. Herein, an unusual hexa-nuclear cadmium cluster functionalized reductive phosphomolybdate hybrid as photo-electrochemical sensor was designed and synthesized with formula of {[Cd(H2O)2]2[Cd(btmbp)]2}{Cd(P4Mo6O31H7)2}·20H2O (1) (btmbp= 4,4′-bis((1H-1,2,4-triazol-1-yl)methyl)biphenyl), in which the photoactive hexa-nuclear {Cd6} clusters cooperated with reductive phosphomolybdate [P4Mo6O31]12− endow the material with wide light absorption and remarkable redox activity, thus achieving efficient photo-assisted electrochemical Cr(VI) detection performance. Under visible-light assistance, the detection limit (LOD) and sensitivity of Cr(VI) is 4.17 nmol/L (0.225 ppb) and 226.32 µA L/µmol, which is apparently superior to the performance without photo-assistance (6.25 nmol/L and 106.95 µA L/µmol) and far satisfies the demands of world health organization (WHO) for potable water (50 ppb). Moreover, compound 1 showed prominent Cr(VI) detection performance in practical water samples together with remarkable anti-interference capacity and good electrochemical durability. This work provides an important guidance for designing efficient polyoxometalate-based crystalline sensors for Cr(VI) detection.

Ti2CTx MXene: A novel p-type sensing material for visible light-enhanced room temperature methane detection

The development of semiconductor-based room-temperature methane (CH 4 ) gas sensors is appealing but challenging. Herein, we report a CH 4 gas sensor operating at room temperature based on Ti 2 CT x MXene, a novel p-type sensing material, achieving high-performance CH 4 detection with visible light assistance. The Ti 2 CT x MXene based device showed more than seven-fold improvement for CH 4 detection under visible-light irradiation, and the response/recovery times were also sharply decreased. The excellent CH 4 sensing performance at room temperature could be attributed to the visible-light photocatalytic CH 4 oxidation activity of the Ti 2 CT x sensing material. CH 4 oxidation was revealed by photocatalytic measurement, O 2 -TPD and in-situ IR spectroscopies. The present work demonstrates the novel application of Ti 2 CT x MXene as a promising p-type sensing material for methane detection at room temperature. Moreover, the concept of “photocatalysis-enhanced gas sensing” can be employed in room-temperature gas sensors based on other novel semiconductors.

Photo-thermal CO2 reduction with methane on group VIII metals: In situ reduced WO3 support for enhanced catalytic activity

Photo-thermal CO2 reduction with methane (CRM) is beneficial for solar energy harvesting and energy storage. The search for efficient photo-thermal catalysts is of great significance. Here, we reveal that group VIII metal catalysts supported by optical material WO3 are more effective for photo-thermal CRM, giving catalytic activities with visible light assistance that are 1.4–2.4 times higher than that achieved under thermal conditions. The activity enhancement (1.4–2.4 times) was comparable to that achieved with plasmonic-Au-promoted catalysts (1.7 times). Characterization results indicated that WO3 was partially reduced to WO3–xin situ under the reductive CRM reaction atmosphere, and that WO3–x rather than WO3 enhanced the activities with visible light assistance. Our method provides a promising approach for improving the activity of catalysts under light irradiation.

Activation of K2S2O8 by Ni–Ce composite oxides for the degradation of orange II with visible light assistance

NiO and CeO2 composite metal oxides (NiO–CeO2) were synthesized by sol-gel method to investigate a degradation system by persulfate (PS) activation with the assistance of visible light (Vis). The phase composition of NiO–CeO2 was detected by X-ray diffraction (XRD), the morphology of NiO–CeO2 was characterized by scanning electron microscope (SEM), and the result of X-ray photoelectron spectroscopy (XPS) proved the element composition and valence state of the NiO–CeO2. In the Vis/PS/NiO–CeO2 system, the degradation rate of Orange II using a concentration of 50 mg/L was as high as 90% in 15 min but it increased to as high as 99% in 60 min. Mechanism studies have shown that the combination of NiO and CeO2 generated more oxygen vacancies, and activated persulfate to generate active oxygen species. Moreover, the effects of visible light, persulfate concentration and pH were evaluated, and the results showed that the participation of visible light and persulfate could significantly increase the degradation efficiency of Orange II, but pH had little effect on the degradation. Quenching experiments and detection by ESR showed that O2‾, •SO4‾, •OH, and 1O2 all contribute to the removal of Orange II. In addition, the recovery and reuse properties of NiO–CeO2 may lead to sustainable treatment of wastewater.

MIL-100 (Fe) with mix-valence coordinatively unsaturated metal site as Fenton-like catalyst for efficiently removing tetracycline hydrochloride: Boosting Fe(III)/Fe(II) cycle by photoreduction

Iron-based MOFs have been considered as the candidate for Fenton-like reagents owing to their open pore size and uniformly dispersed Fe active centers. However, the strong coordination of metal ions with organic ligands greatly reduces the exposed active sites of most iron-based MOFs, thus reducing Lewis acid sites and limiting the activation efficiency of H2O2. At the same time, low Fe3+/Fe2+ cycle efficiency also restricts H2O2 activation efficiency. Hence, in this work, a series of MIL-100 (Fe) containing mixed valence coordinatively unsaturated metal site (CUS) with different Fe2+/Fe3+ ratios was synthesized by heat treatment and used for tetracycline hydrochloride (TC-HCL) degradation with the assistance of visible light. Interestingly, accelerated Fe3+/Fe2+ cycle was observed with the aid of visible light. Among the prepared samples, CUS-MIL-250 prepared under vacuum at 250℃ has superior degradation performance, primarily owing to its large specific surface area and pore volume, improved visible light absorption, and the introduction of more Fe2+ CUS. Meanwhile, compared with Fenton-like system and photocatalytic system, the CUS-MIL-250/H2O2/Vis system, with effective separation of photogenerated electrons and holes, demonstrates a synergistic effect to generate more reactive oxidation species, thereby improving the degradation efficiency. In addition, the catalyst shows good stability and recyclability.