3N4 Z-scheme Heterojunction Research Articles

Construction and degradation mechanism of the magnetic CoFe1.95Y0.05O4/Ag/g-C3N4 Z-scheme heterojunction for enhanced photocatalytic activity

In this study, a Z-scheme heterojunction CoFe1.95Y0.05O4/Ag/g-C3N4 (CFYO/ACN) magnetic nanocomposite was prepared by hydrothermal synthesis. The composite was characterised and analyzed using different characterization tools and its photocatalytic degradation activity towards methylene blue (MB) was investigated. The results showed that the CFYO/ACN photocatalyst compared to CoFe1.95Y0.05O4 (CFYO) and Ag/g-C3N4 (ACN), the composite CFYO/ACN had the highest degradation efficiency of MB, which was up to 97 % within 120 min, which was 1.26 and 1.09 times higher than that of ACN and CFYO, respectively. The enhancement of the catalytic performance of CFYO/ACN was attributed to the fact that the heterogeneous junction formation effectively inhibited the complexation of photogenerated carriers. In addition, five consecutive cyclic degradation experiments showed that CFYO/ACN exhibited efficient photocatalytic degradation, stable crystal structure, and easy recycling in the photodegradation process. Finally, the capture experiments confirmed that superoxide radicals (⋅O2−) and hydroxyl radicals (·OH) play a major role in the degradation process. This study provides an effective strategy for the construction of efficient photocatalysts.

Construction of Ag3PO4/g-C3N4 Z-Scheme Heterojunction Composites with Visible Light Response for Enhanced Photocatalytic Degradation.

Ag3PO4/g-C3N4 photocatalytic composites were synthesized via calcination and hydrothermal synthesis for the degradation of rhodamine B (RhB) in wastewater, and characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and diffuse reflectance spectroscopy (DRS). The degradation of RhB by Ag3PO4/g-C3N4 composites was investigated to evaluate their photocatalytic performance and cyclic degradation stability. The experimental results showed that the composites demonstrated notable photocatalytic activity and stability during degradation. Their high degradation efficiency is attributed to the Z-scheme transfer mechanism, in which the electrons in the Ag3PO4 conduction band and the holes in the g-C3N4 valence band are annihilated by heterojunction recombination, which greatly limits the recombination of photogenerated electrons and holes in the catalyst and enhances the activity of the composite photocatalyst. In addition, measurements of photocurrent (PC) and electrochemical impedance spectroscopy (EIS) confirmed that the efficient charge separation of photo-generated charges stemmed from strong interactions at the close contact interface. Finally, the mechanism for catalytic enhancement in the composite photocatalysts was proposed based on hole and radical trapping experiments, electron paramagnetic resonance (EPR) analysis, and work function evaluation.

Ferroelectric polarization in Bi0.9Dy0.1FeO3/g-C3N4 Z-scheme heterojunction boosts photocatalytic hydrogen evolution

Ferroelectric polarization in Bi0.9Dy0.1FeO3/g-C3N4 Z-scheme heterojunction boosts photocatalytic hydrogen evolution

Construction of visible-light-driven 2D/2D NiFe2O4/g-C3N4 Z-scheme heterojunction photocatalyst for effective degradation of organic pollutants and CO2 reduction

Developing photocatalytic systems with higher redox capability, large reactive surface area and enhanced charge separation are essential both from scientific and practical perspectives. To address both environmental and energy issues, herein, using a simple solvothermal and wet-chemical method, we designed a dimensionally matched Z-scheme NiFe2O4/g-C3N4 (NFO/CN) heterojunction to realize higher charge separation as confirmed from various physiochemical and electrochemical analysis. The optimized 6NFO/CN catalyst exhibited about 5.5, and 4.4-fold higher photocatalytic activity in the degradation of 2,4-dichlorophenol (2,4-DCP) and bisphenol A (BPA) pollutants respectively, in comparison to bare g-C3N4 nanosheets (CN). Further, the prepared samples also displayed 8.3-fold higher photoactivity for CO2 reduction to CO and CH4. The exceptionally improved visible-light activities were mainly attributed to the enormously enhanced charge separation through the construction of interfacial matching heterojunction for Z-scheme charge transfer. Moreover, the degradation of pollutants was primarily attributed to the involvement of superoxide radicals (•O2-). Hopefully, this study will provide a deep understanding to design g-C3N4-based dimensionally matched Z-scheme heterojunction photocatalysts for environmental remediation and solar fuel conversion.

Construction of Bi2WO6/g-C3N4 Z-Scheme Heterojunction and Its Enhanced Photocatalytic Degradation of Tetracycline with Persulfate under Solar Light.

Z-scheme heterojunction Bi2WO6/g-C3N4 was obtained by a novel hydrothermal process; its photocatalysis-persulfate (PDS) activation for tetracycline (TC) removal was explored under solar light (SL). The structure and photoelectrochemistry behavior of fabricated samples were well characterized by FT-IR, XRD, XPS, SEM-EDS, UV-vis DRS, Mott-Schottky, PL, photocurrent response, EIS and BET. The critical experimental factors in TC decomposition were investigated, including the Bi2WO6 doping ratio, catalyst dosage, TC concentration, PDS dose, pH, co-existing ion and humic acid (HA). The optimum test conditions were as follows: 0.4 g/L Bi2WO6/g-C3N4 (BC-3), 20 mg/L TC, 20 mg/L PDS and pH = 6.49, and the maximum removal efficiency of TC was 98.0% in 60 min. The decomposition rate in BC-3/SL/PDS system (0.0446 min-1) was 3.05 times higher than that of the g-C3N4/SL/PDS system (0.0146 min-1), which might be caused by the high-efficiency electron transfer inside the Z-scheme Bi2WO6/g-C3N4 heterojunction. Furthermore, the photogenerated hole (h+), superoxide (O2•-), sulfate radical (SO4•-) and singlet oxygen (1O2) were confirmed as the key oxidation factors in the BC-3/SL/PDS system for TC degradation by a free radical quenching experiment. Particularly, BC-3 possessed a wide application potential in actual antibiotic wastewater treatment for its superior catalytic performance that emerged in the experiment of co-existing components.

0D/2D Co-doped Fe2O3/g-C3N4 Z-scheme heterojunction for efficient photo-Fenton organic pollutant removal

Owing to the low conversion efficiency of Fe3+ to Fe2+ during the peroxymonosulfate (PMS) activation process, the design of an efficient Fenton-like catalyst is still a challenge. In this work, 0D/2D Co-doped Fe2O3/g-C3N4 (CNCFO) composite catalysts were constructed for organic pollutant degradation, where the Co-doping not only boosts the conversion efficiency of Fe3+ to Fe2+, but also acts as active site for PMS activation. Among them, CNCFO2 showed excellent catalytic performance, where 96.4% of MO could be degraded within 45 s. X-ray photoelectron spectroscopy (XPS) confirmed that the cobalt doping promoted the cycle of Fe3+/Fe2+, which was responsible for the enhanced PMS activation. Meanwhile, the good stability and reusability of CNCFO2 itself provide opportunities for its potential practical applications. Based on systematical characterizations, the Z-scheme photo-Fenton mechanism was proposed. This study offers a fresh perspective on the advancement of designing highly efficient Fenton-like catalyst for applications in the field of environmental purification.

Synthesis of CoWO4/g-C3N4 Z-scheme heterojunction for the efficient photodegradation of diazinon with the addition of H2O2

Pesticides are on the list of substances that are routinely monitored by agencies and organizations in various natural environments and habitats. Diazinon (DZN) is the active ingredient in more than 20 agricultural pesticides, it causes the most damage and has been prohibited in many countries around the world. The final product CoWO4/g-C3N4 Z-scheme heterojunction was successfully synthesized in this work, where CoWO4 nanoparticles were deposited on the surface of g-C3N4. CoWO4/g-C3N4 structure allowed for the efficient separation of photo-generated electron-hole pairs, with electrons at the CoWO4 CB migrating to the g-C3N4 VB and preserving the electrons at the g-C3N4 CB and holes in the CoWO4 VB. The photodegradation efficiency of DZN using CoWO4/g-C3N4 Z-scheme heterojunction was investigated, as compared with its precursors, such as CoWO4, and g-C3N4. CoWO4/g-C3N4 Z-scheme heterojunction demonstrated the highest degradation capacity for DZN removal. Based on the results, the photocatalysis of the CoWO4/g-C3N4 Z-scheme heterojunction can be recycled for the effective removal of DZN by simple washing after three runs, proving the heterojunction’s stability and suggesting CoWO4 as a promising material for the removal of DZN from contaminated water sources.

Exceptional Photocatalytic Performance of the LaFeO3/g-C3N4 Z-Scheme Heterojunction for Water Splitting and Organic Dyes Degradation

To simulate natural photosynthesis, scientists have developed an artificial Z-scheme system that splits water into hydrogen and oxygen using two different semiconductors. Researchers are striving to improve the performance of Z-scheme systems by improving light absorption, developing redox couples with high stability, and finding new cocatalysts. Here, we report the synthesis and utilization of LaFeO3/g-C3N4 as a Z-scheme system for water reduction to produce hydrogen and organic dye degradation under visible light irradiation. The as-fabricated photocatalyst revealed exceptional activity for H2 production (i.e., 351 µmol h−1g−1), which is 14.6 times higher compared to that of the single-component g-C3N4 (i.e., 24 µmol h−1g−1). In addition, the composite photocatalyst degraded 87% of Methylene Blue (MB) and 94% of Rhodamine B (RhB) in 2 h. Various experimental analyses confirmed that the exceptional performance of the LaFeO3/g-C3N4 Z-scheme catalyst is due to remarkably enhanced charge carrier separation and improved light absorption. The development of this highly effective Z-scheme heterostructure photocatalyst will pave the way for the sustainable development of newly designed Z-scheme scheme systems that will tackle energy and environmental crises.

Construction of 0D/1D CdS/g-C3N4 Z-scheme heterojunction for highly selective photocatalytic benzylamine oxidative coupling

The efficient solar-to-chemical energy conversion system is a green and cost-effective approach for producing high-value-added chemicals in chemical industry, which is highly demanded to develop. Photocatalytic C–N coupling of benzylamine into economic N-benzylidenebenzylamine is a great potential method for alternative conventional organic synthesis. In this work, a zero-dimensional/one-dimensional CdS/g-C3N4 Z-scheme heterojunction was constructed via in situ growing CdS quantum dot onto g-C3N4 nanorod surface for enhancing the spatial separation of charge carriers and maintaining the strong redox ability of the photogenerated charges and applied simultaneously in photocatalytic C–N coupling of benzylamine. This enables 20 wt% CdS/g-C3N4 to exhibit a remarkable photocatalytic performance enhancement for the production of C–N coupled product of benzylamine with the optimal yield of 199.79 μmol which is approximately 4.3 folds than those of pristine g-C3N4 under 2 h visible irradiation. Moreover, benzylamine conversion of approximately 90% within 100 h can be obtained in a gram scale-up reaction. By means of controlled photoelectric chemistry and in situ electron spin resonance spectroscopy experiments, possible spatial photogenerated charges separation and benzylamine conversion mechanisms on the Z-scheme junction were investigated in detail. This work paves a promising strategy for constructing zero-dimensional/one-dimensional Z-scheme heterojunction for the photocatalytic synthesis of high-value-added products.

Synthesis of BiOCl/C/g-C3N4 Z-scheme heterojunction: mercury lamp-driven heterojunction for efficient degradation of phenol

Synthesis of BiOCl/C/g-C3N4 Z-scheme heterojunction: mercury lamp-driven heterojunction for efficient degradation of phenol

A novel (Zr/Ce)UiO-66(NH2)@g-C3N4 Z-scheme heterojunction for boosted tetracycline photodegradation via effective electron transfer

Aiming at efficient tetracycline (TC) removal, a co-modified (Zr/Ce)U(NH2) was elaborately designed and integrated with thin-layered g-C3N4, forming a novel (Zr/Ce)U(NH2)@CN Z-scheme heterojunction. XRD, XPS, FTIR, ISI-XPS and other analysis cooperatively demonstrated that within this (Zr/Ce)U(NH2)@CN composite organic linkers H2BDC was successfully modified by –NH2, metal Zr in Zr-oxo cluster was partially substituted by Ce, Z-scheme heterojunction was formed by the close interaction between MOFs and g-C3N4, as well as the excellent thermal stability and large specific surface area were achieved. Since g-C3N4 could serve as carrier skeleton to improve the precursor dispersion, the (Zr/Ce)U(NH2) with reduced particle size grew densely on it. DRS, PL and TRPL characterization proved more photogenerated carriers with prolonged lifetime were generated. As expected, (Zr/Ce)U(NH2)@CN composite exhibited high TC degradation rate, whose kinetic constant was 23.73 times greater than that of UiO-66, and 5.89 folds larger than that of CN, respectively. This enhanced photocatalytic performance was ascribed to the effective electron transfer regulated by MOFs unit, where the Zr/Ce improved the electron transfer from photoexcited organic linkers to metal-oxo clusters, as well as the MOFs/g-C3N4 Z-scheme heterojunction strengthened interfacial photogenerated carriers transfer. ·OH was the vital species responsible for TC removal using (Zr/Ce)U(NH2)@CN. Furthermore, intermediate products and degradation pathways were proposed based on HPLC-MS. The toxicity estimation indicated the comprehensive toxicity of TC was significantly alleviated by (Zr/Ce)U(NH2)@CN photocatalysis.

Construction of ternary Bi2O3/biochar/g-C3N4 heterojunction to accelerate photoinduced carrier separation for enhanced tetracycline photodegradation

As an efficient means to facilitate separation of photoinduced charge carriers, Z-scheme heterojunction photocatalysts have been constructed recently for degradation of antibiotic residues. In this work, an innovative ternary Bi2O3/biochar/g-C3N4 Z-scheme heterojunction was prepared as a promising photocatalyst for efficient photodegradation of tetracycline, of which conductive biochar was introduced to boost the separation rate of photoinduced carriers. The as-prepared Bi2O3/biochar/g-C3N4 heterojunction delivered a high visible-light-driven photodegradation efficiency of tetracycline at 86.7% in 30 min with an apparent kinetic constant at circa 0.0610 min−1, which was larger by circa 6, 3, and 2 times, respectively, than those of pure g-C3N4 (0.0104 min−1), binary biochar/g-C3N4 (0.0223 min−1), and binary Bi2O3/g-C3N4 (0.0393 min−1). Such Bi2O3/biochar/g-C3N4 heterojunction was demonstrated excellent stability upon recycled usage. The free radical quenching testing and ESR results verified that superoxide (•O2–) and hydroxyl (•OH) radicals played a significant role in the photodegradation reaction of tetracycline, and the transfer process of photoinduced charge carrier was proposed as a Z-scheme mechanism. This research offers a potential way to construct high-performance Z-scheme heterojunction photocatalysts for practical wastewater treatment.

Synthesis of WO3/g-C3N4 Z-scheme heterojunction with novel photocatalytic activity for degradation of residual antibiotics in aquatic environment under visible light

In the research, we successfully synthesized WO3/g-C3N4 Z-scheme heterojunction for photocatalytic degradation of tetracycline. These synthesized materials have been characterized by X-ray diffraction (XRD), Scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR Spectroscopy), to investigate their crystal phase, morphology and chemical compositions. The synthesized WO3/g-C3N4 Z-scheme heterojunction exhibited novel photocatalytic activity for the degradation of Tetracyline even under visible light. This was due to photo-excited electrons in the conduction band of WO3 transferred to the valence band of the g-C3N4 preserving electrons in the conduction band of the g-C3N4 and holes in the valence band of WO3. These electrons and holes would react with oxygen and water to produce oxidative radicals for effective degradation of Tetracycline. The synthesized WO3/g-C3N4 photocatalytically degraded approximately 56 % Tetracycline 10 ppm when it was irradiated by visible light of 32 W for 90 mins.

Construction of direct FeMoO4/g–C3N4–2D/2D Z-scheme heterojunction with enhanced photocatalytic treatment of textile wastewater to eliminate the toxic effect in marine environment

A novel FeMoO4/g-C3N4-2D/2D Z-scheme heterojunction photocatalyst was prepared via wet chemical method. The observed structural morphology of FeMoO4/g-C3N4 reveals the 2D-iron molybdate (FeMoO4) nanoplates compiled with the 2D-graphitic carbon nitride (g-C3N4) nanosheets like structure. The photocatalytic activity of the g-C3N4, FeMoO4, and FeMoO4/g-C3N4 composites were studied via the degradation of Rhodamine B (RhB) as targeted textile dye under visible light irradiation (VLI). The optimal FeMoO4/g-C3N4 (1:3 ratio of g-C3N4 and FeMoO4) composite show an enhanced degradation performance with rate constant value of 0.02226 min–1 and good stability even after three cycles. Thus, the h+ and O2•－are the key radicals in the degradation of RhB under VLI. It is proposed that the FeMoO4/g-C3N4 Z-scheme heterojunction effectively enhances the transfer and separation ability of e−/h+ pairs, by the way increasing the photocatalytic efficiency towards the RhB degradation. Thus, the newly constructed Z-scheme FeMoO4/g-C3N4 heterojunction photocatalyst is a promising material for the remediation of wastewater relevant to elimination of toxic effect in marine environment.

Dual-metal sites CuInS2/g-C3N4Z-scheme heterojunction with efficient photocatalytic CO2 reduction selectivity

The application of solar energy to transform carbon dioxide into energy-rich products is one of the sustainable ways to alleviate energy scarcity and environmental crisis. However, the low efficiency of solar light and the high recombination of photogenerated electron-hole pairs limit the industrial value of photocatalytic technology in terms of applications. Here, we report a high-performance photocatalyst based on g-C3N4, which was compounded and modified utilizing CuInS2. The photocatalytic performance is enhanced by constructing Z-scheme heterojunction for efficient separation and transfer of photogenerated carriers to meet the practical application requirements. CuInS2/g-C3N4 has the best photocatalytic CO yield of 246.75 μmol/g/h and CO selectivity of more than 93%. The role of dual-metal sites in the catalytic system is also explored by DFT calculations. The results not only provide a new perspective for the design of efficient CO2 photoreduction photocatalysts, but also provide a proven method for enhancing the performance of photocatalysts.

Constructing defect engineered 2D/2D MoO3/g-C3N4 Z-scheme heterojunction for enhanced photocatalytic activity

Photocatalytic redox technology is established in energy and environmental governance with its environmentally friendly and broad-based optical source. However, the development of photocatalysts with strong redox ability still remains urgently desirable. Herein, an oxygen vacancy-engineered 2D/2D Z-scheme heterojunction photocatalytic materials of MoO3/g-C3N4 are synthesized, which achieves a trade-off between the value band position of MoO3 with high oxidation property and the conduction band position of g-C3N4 with high reduction property. The 2D/2D heterojunction manifests excellent functionality for photocatalytic H2 evolution and tetracycline degradation. Particularly, 3 % MoO3/g-C3N4 provides the optimum H2 generation rate (328.75 μmol g−1 h−1) without any noble metal cocatalyst, which is about 87-fold higher than that of pure g-C3N4 (3.78 μmol g−1 h−1). Moreover, the TC degradation kinetic constant of 3 % MoO3/g-C3N4 (0.0196 min−1) is about 8.28 times of pure g-C3N4 (0.0023 min−1). The outstanding photo-catalytic ability mainly comes from the interfacial interaction between 2D MoO3 and 2D g-C3N4, which can shorten the transport distance of charge carriers and contribute abundant active sites to improve the separation efficiency of photogenerated carriers. Furthermore, the oxygen vacancies (OVs) strengthen the redox potential of the system and serve as effective trapping sites for photogenerated carriers to reduce the quenching rate of photogenerated electrons. This work provides a feasible strategy to develop 2D/2D Z-scheme photocatalytic systems with high photocatalytic performance on energy storage and environmental application.

Enhanced 4-chlorophenol Degradation under Visible and Solar Radiation through TiO2/g-C3N4 Z-Scheme Heterojunction

The efficient remediation of the persistent organic pollutant known as 4-chlorophenol (4CP) in aqueous effluent presents a challenge for a wide array of industries due to its elevated toxicity and resistance to natural degradation processes. This study proposes the development of a hybrid photocatalyst composed of titanium dioxide (TiO2) and graphitic carbon nitride (g-C3N4), aiming to increase the efficiency of photocatalytic degradation of 4CP under solar and visible radiation through the formation of Z-scheme heterojunction between the semiconductors. The results showed that the synthesis of the TiO2/g-C3N4 binary material was successful by X-ray diffractometry and infrared spectrometry. Furthermore, the addition of g-C3N4 to TiO2 led to optical and morphological modifications, such as the pore volume increase and gap energy of TiO2/g-C3N4. Concerning the photocatalytic evaluation, the main results indicate that photocatalytic activity under visible radiation of the TiO2/g-C3N4 improved by 44.8% compared to pure TiO2, whereas an improvement of 30.5% was obtained under simulated solar radiation. This improvement in efficiency was further corroborated by chronoamperometry tests, which demonstrated a higher photocurrent generation for the TiO2/g-C3N4. The radical generation mechanism suggested the creation of an effective Z-scheme heterojunction between the semiconductors, as the formation of both hydroxyl and superoxide radicals was observed.

Facile synthesis of Z-scheme KBiO3/g-C3N4 Z-scheme heterojunction photocatalysts: Structure, performance, and mechanism

The proper design of interfacial contact of heterojunction photocatalyst plays an important role in the transfer/separation of interfacial charge carriers. The Z-type photocatalyst can reduce the recombination of photogenerated electron-hole pairs and retain the original redox ability. Here, KBiO3/g-C3N4 Z-scheme heterojunction photocatalysts were facile synthesized by mixing and programmed heating. Compared to pure g-C3N4 and KBiO3, the photocatalytic performance of the obtained photocatalyst on the photo-oxidative degradation of crystal violet and phenol was improved significantly. The apparent rate constants of degrading CV (Crystal Violet) and phenol were 0.15493 min−1 and 0.02057 min−1, which were 10 times and 4 times that of pure KBiO3, respectively. The formation mechanism of KBiO3/C3N4 Z-type heterojunction was investigated by experiments and DFT calculations. The result shows that the improvement of photo-degradation performance was attributed to the internal electric field formed by the Z-scheme photo-catalyst, which leads to the enhancement of visible light absorption and the blocking effect of light-induced electron-hole recombination.

Hollow spherical biomass derived-carbon dotted with SnS2/g-C3N4 Z-scheme heterojunction for efficient CO2 photoreduction into CO

The core of realizing the effective CO2 conversion by solar energy is to develop a stable photocatalyst with high CO2 adsorption capacity and high charge separation efficiency. In this work, a hollow spherical Z-scheme SnS2/g-C3N4/C (SCC) photocatalyst is successfully constructed by a morphology-inherited strategy. Biomass mabospores are utilized as both the precursor for formation of hollow spherical structure and carbon source, and the g-C3N4 and SnS2 nanosheets tightly anchor on the surface of mabospores-derived carbon spheres. The Z-scheme SCC heterostructure exhibits 5.5 times activity enhancement on CO2 photoreduction to CO with a high evolution rate up to 40.86 μmol∙g−1∙h−1. Examined by various photoelectrochemical analysis, the boosted photocatalytic activity originates mainly from the construction of hollow spherical Z-scheme heterojunction, providing the more preferable basic sites for CO2 adsorption, promoting the separation efficiency of electron-hole pairs, as well as increasing the reductionability of electrons in conduction band of g-C3N4. The formed internal electric fields between the g-C3N4 and SnS2 can also further reinforce the spatial separation of photogenerated charge carriers. Theoretical calculations further verify that the SCC Z-scheme heterostructure can effectively decrease the energy barriers of formed intermediates, especially the crucial COOH*, and thus leading to the facile conversion of CO2-to-CO. This work induces a new strategy to construct g-C3N4-based Z-scheme heterojunction assisted by versatile biomasses with optimized structure and enhanced photoelectrochemical merits for efficient CO2 conversion into chemical fuels.

Constructing a novel NaLa(WO4)2/g-C3N4 Z-scheme heterojunction with efficient carrier separation for excellent photocatalytic purification of NO

In this paper, a novel NaLa(WO4)2/g-C3N4 photocatalyst with Z-scheme heterojunction was synthesized for the first time, and the photocatalytic purification of NOx was used as an evaluation method of its activity. The structure was analyzed in depth by X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and other characterization methods. NaLa(WO4)2 and g-C3N4 have obvious interfaces and successfully constructed a Z-scheme heterojunction structure. The combination of photogenerated electrons on the conduction band (CB) of NaLa(WO4)2 with holes on the valence band (VB) of g-C3N4 leads to the accumulation of the remaining holes and electrons on the VB of NaLa(WO4)2 and CB of g-C3N4, and finally realizes the effective separation of photogenerated carriers and maintains the high redox ability of the catalyst. The NaLa(WO4)2/g-C3N4 composite catalyst has a highest NO purification rate of 47.18%, which is 16.51% higher than pure g-C3N4. Moreover, the In-situ DRIFTS monitors the reaction intermediates and final products of NO on the NaLa(WO4)2/g-C3N4 heterojunction surface under visible light irradiation, and provides the corresponding reaction equations. This work provides a new type of photocatalyst that is easy to prepare and highly active, as well as a low-cost photocatalytic treatment technology to remove NO in the environment.