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The development of novel heterojunctions with optimized interface contact is essential for realizing the highly efficient solar conversion in photocatalysis. In this work, a series of β-Bi2O3/ZnIn2S4 (BO/ZIS) nanocomposite photocatalysts were firstly fabricated via a facile self-assembly process, in which a large number of ZnIn2S4 nanosheets were t...
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Several strategies are currently available to improve the photocatalytic response and performance of materials and devices. Despite this, the most common strategies are still based on the promotion of efficient carrier transfer/lifetime of photo-exited electrons and bandgap tailoring. In this work, we present conclusive experimental evidence of the...
In this study, Sb2S3/In2S3/TiO2 (SIT) heterojunction photocatalysts were prepared by a simple two-step hydrothermal method and applied to the photocatalytic degradation of levofloxacin (LEV). After 160 min of reaction under visible light, the SIT heterojunction photocatalyst degraded 10 mg L⁻¹ LEV at a rate of 86.7%. The degradation of LEV follows...
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g-C3N4 has drawn lots of attention due to its photocatalytic activity, low-cost and facile synthesis, and interesting layered structure. However, to improve some of the properties of g-C3N4, such as photochemical stability, electrical band structure, and to decrease charge recombination rate, and towards effective light-harvesting, g-C3N4–metal oxi...
In this study, the MoS2–SnS2 heterojunctions were prepared by a hydrothermal and studied their basic properties. The prepared catalyst’s crystal structure, chemical composition, optical properties and morphological analysis were analyzed through XRD, XPS, SEM, TEM, UV–Vis DRS and PL analysis. The photocatalytic performance of the synthesized cataly...
Citations
... The CB position along with the VB position for all the synthesized catalysts are shown in Fig. 8c. 83 Although CoO x possessed CB position within the limit of water splitting reaction, probably as mentioned earlier due to non-availability of any electron scavenging agent, it did not participate well in the photooxidation process. The VB of the most effective catalyst (CoO x -S-VO x ) was also calculated using UPS analysis shown in Fig. S14a and b (ESI †). ...
... (a) Plausible charge transfer routes for the CoO x -S-VO x material, (b) Mott-Schottky (flat band potential) and (c) band edge structure plot of all the catalysts, (I) CoO x (II) CoO x -S-VO x , (III) Co 3 O 4 -V 2 O 5 , (IV) S-VO x . [Flat band potential (E FB ) = Conduction band potential (E CB ) + 0.1 V, Valance band potential (E VB ) = Band gap + E CB ].83 ...
Cobalt oxide (CoOx) derived from a zeolitic imidazolate framework (ZIF) was modified with sulfur-doped vanadium oxide (VOx) using an impregnation method. The presence of inorganic sulfur in the mixed metal oxide matrix was confirmed through various physicochemical and spectroscopic techniques. The hybrid material designated as CoOx–S–VOx was applied as a catalyst for rapid reduction of toxic chromium, Cr(vi), in the presence of sodium borohydride, NaBH4. CoOx–S–VOx + NaBH4 (1 mmol) reduced Cr(vi) to Cr(iii) within three minutes (3 min). The same catalyst possessing a band gap of ∼3.14 eV served as an effective photocatalyst for the degradation of methyl orange (MO) dye on irradiating with UV-light. The optimization of different parameters indicated that the degradation of photocatalytic dye proceeded very efficiently within 15 min with a total mineralization of 80.06%. The dye degradation experiments carried out under both light and dark phase conditions truly signified the impact of light irradiation on MO degradation. Mott–Schottky analysis and ultraviolet photoelectron spectroscopy (UPS) were performed to calculate the band edge positions of the material. Both the aforementioned analyses predicted that the hybrid catalyst possessed a perfect band structure that could provide high activity to the material. The mechanistic study of the dye degradation process suggested that the MO decomposition was mostly caused by free radicals. The presence of sulfur was considered to play an active role in enhancing the dye degradation process by reducing the electron–hole recombination rate. The catalyst was recyclable for ten consecutive cycles without any significant loss in catalytic activity.
... The photocurrent response of ZIS is shown in Fig. S4. It is postulated that a direct relationship may exist between the strength of photocurrent and the effectiveness of charge separation 69 . As a result, the 15% ZIS/BO hybrid prepared in this study demonstrates enhanced efficiency in charge migration and separation, leading to improved photocatalytic activity. ...
... We know that the recombination of charges is related to the PL intensity signal, which in turns, provides the idea about efficiency of photocatalytic and PEC activity. Generally, lower the intensity peak higher the photogenerated charge separation efficiency and vice versa [40,41]. Here we recorded the PL signal of bare ZIS and the composite ZIS/PANI with an incident laser of fixed wavelength 325 nm. ...
... The PL intensity peak of ZIS decreases substantially for ZIS/PANI nanocomposite. The heterojunction between ZIS and PANI effectively promote the charge separation through the interface, which reduces the recombination of the excited electron and thus reflects in the reduction intensity of PL at 550 nm [41]. The lowering of the intensity for ZIS/PANI nanocomposites clearly indicates that the PANI in the nanocomposites increases charge separation because of formation of type-II heterostructure in between ZIS and PANI and it is expected to improve photocatalytic efficiency. ...
In our work, zinc indium sulfide coupled polyaniline (ZnIn2S4/PANI) nanocomposites were synthesized using chemisorption method. The substantial enhancement in the photocatalytic and photoelectrochemical (PEC) water splitting activity under visible light illumination was demonstrated. ZnIn2S4/PANI nanocomposites were shown ∼3 times improvement in the photodegradation of methylene blue (MB) dye as compared to bare ZnIn2S4 (ZIS) nanoflakes. In addition, the ZIS/PANI nanocomposite photoelectrode was exhibited ∼3 times enhancement in photocurrent density (∼260 μA/cm² at 0.8 V vs. Ag/AgCl) as compared to ZnIn2S4 photoelectrode. However, the ZIS/PANI photoanode was demonstrated ∼5 fold enhancement in the incident photon to current conversion efficiency (IPCE) than bare ZIS. The enhancement in the photodegradation and PEC water splitting activity of ZIS/PANI nanocomposite is ascribed to extended visible light absorption, and synergetic effect of PANI along with type-II heterojunction formation, which is beneficial for separation of charge and faster transfer efficiency of photogenerated charge carriers. This study demonstrates that establishing a heterostructure system by coupling a ternary chalcogenide semiconductor with a conducting polymer is effective for photocatalytic wastewater treatment and PEC water splitting applications.
... Thereinto, the peaks at 284.8 and 286.4 eV are connected with C--C and C-C, and the other at 288.8 eV assigned to O--C-OH . In addition, there are two characteristic peaks in the O 1s spectrum (Fig. 3f), in which the weak peak located at 530.5 eV is because of the typical Ti-O, and the strong one at the B.E. of 531.9 eV originates from the -OH in the organic ligand (Xiao et al., 2020). Overall, the above XPS results precisely verified the coexistence of NH 2 -MIL-125(Ti) and Znln 2 S 4 in NM(2%)@ZIS heteroarchitecture. ...
Developing novel heterojunction photocatalysts with visible-light response and remarkable photocatalytic activity have been verified to applying for the photodegradation of antibiotics in water environment. Herein, NH2-MIL-125(Ti) was integrated with flowerlike ZnIn2S4 to construct NH2-MIL-125(Ti)@ZnIn2S4 heterostructure using a one-pot solvothermal method. The photocatalytic performance was evaluated by the degradation of tetracycline (TC) under visible light illumination. The optimized NM(2%)@ZIS possesses a photodegradation rate (92.8%) and TOC removal efficiency (58.5%) superior to pristine components, which can be principally attributed to the positive cooperative effects of well-matched energy level positions, strong visible-light-harvesting capacity, and abundant coupling interfaces between the two. Moreover, the probable TC degradation mechanism was also clarified using the active species trapping experiments. This study inspires further design and construction of NH2-MIL-125(Ti) and ZnIn2S4 based photocatalysts for effective removal of antibiotics in water environment.
The development of an earth-abundant, low-cost ultrathin "sheet-on-sheet" heterostructure, comprising few-layered g-C 3 N 4 and ZnIn 2 S 4 nanosheets (FCN/ZIS), demonstrates the remarkable potential for diverse applications. This innovative heterostructure exhibits notable properties, including...
The low carbon dioxide (CO2) conversion efficiency of semiconductor heterojunction-based photocatalysts is a lingering issue in the field of solar energy-driven catalysis. In this study, sandwich-like hierarchical heterostructures of two-dimensional (2D) ultrathin ZnIn2S4 nanosheets and octahedral titanium dioxide (TiO2) nanoparticles were grown in situ on Ti3C2 MXene via a hydrothermal method. Significantly, the ZnIn2S4@TiO2/Ti3C2 ternary heterostructure shows better CO2 reduction activity and the optimal catalyst has carbon monoxide (CO) and methane (CH4) production rates of 59.8 and 23.44 μmol g−1, respectively, within 8 h of simulated solar light illumination, which was greater than that pristine ZnIn2S4. These ultrathin ZnIn2S4 nanosheets and TiO2/Ti3C2 Schottky-junctions assisted the heterostructures to reduce photogenerated electron–hole recombination and increase photogenerated charge-transfer and separation in a Z-scheme pathway. ZnIn2S4@TiO2/Ti3C2 heterostructure photocatalysts have superior photocatalytic CO2 conversion and good stability compared to pure ZnIn2S4. Thus, the suggested approach is to design a highly-efficient photocatalyst for environmental remediation.
