Materials Today Chemistry
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2024
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IF 6.7
Yun Zheng,Yikai Wang,Yilin Chen,Yayun Wang,Xiaoping Rao,Kang Sun,Jianchun Jiang,Chaochao Qin
The step-scheme (S-scheme) heterojunction shows the merits of controlling the directional transfer of photogenerated charge carriers and realizing a strong redox potential for photocatalytic hydrogen evolution and carbon dioxide reduction. In this paper, a zero/two-dimensional (0D/2D) S-scheme heterojunction composed of cadmium selenide quantum dots and covalent triazine frameworks (CdSe/CTF) is designed and fabricated by an electrostatic self-assembly approach. Compared with pristine CTF and CdSe quantum dots, the photocatalytic activities of CdSe/CTF composites for hydrogen evolution, carbon dioxide reduction and terpene oxidation are significantly enhanced. The hydrogen evolution rate of CdSe/CTF hybrid photocatalyst immobilized with platinum nanoparticles as cocatalyst reached 19.0 mmol g −1 h −1 under visible-light irradiation, and the apparent quantum yield is 9.8 % at 420 nm. The CdSe/CTF hybrid also exhibited more superior photocatalytic activity in carbon dioxide reduction with a carbon monoxide evolution rate of 1.48 mmol g −1 h −1 , and presented higher photocatalytic reactivity in the selective oxidation of α -terpinene to p -cymene. The remarkable enhancement of photocatalytic performance for CdSe/CTF composite is mainly attributed to the facilitated separation and transfer of photoexcited charge carriers of 0D/2D S-scheme heterojunction. This work provides an in-depth insight of utilizing semiconducting polymers as a suitable platform to sustainably transform inexhaustive solar energy to storable chemical energy.
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Materials Research Express
·
2022
·Vol. 9
·期 9
·095001
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IF 2.025
Wanshu Yan,Pingping Hu,Yiguo Jiang,Xiuquan Xu,Xianfeng Ma,Mengru Wang,Xinyue Bao
Photocatalytic inactivation has been proved to be an effective strategy to eliminate pathogenic bacteria in water. Herein, a novel 0D/2D p-n heterojunction of Ag2S-anchored P-doped g-C3N4 (Ag2S/PCN) were constructed by a simple two-step process coupling one-pot calcination and ultrasonic-assisted synthesis. The photocatalytic performance of as-prepared Ag2S/PCN composites was investigated by inactivating multidrug-resistant E. coli under visible light irradiation. The results indicated that Ag2S/PCN-5 possessed outstanding photocatalytic inactivation activity and superior stability, which could completely inactivate 7.0 log E. coli cells within 60 min. The enhanced photocatalytic activity of Ag2S/PCN-5 was mainly attributed to the elevated visible-light response and improved production and transfer of photoexcited charges. In addition, the free radicals trapping experiments results revealed that h+ and •O2− were predominantly responsible for the efficient inactivation activity. Finally, according to the 0D/2D structure and energy band configuration analysis, the enhanced p-n type heterojunction photocatalytic inactivation mechanism of Ag2S/PCN was discussed in detail.
研究领域:
环境科学
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微生物学
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材料科学
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Journal of Materials Chemistry A
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2017
·Vol. 5
·期 38
·20448-20457
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IF 8.867
Yufeng Wu,Jinxin Wei,Siyi Guo,Kaixin Yu,Zanyong Zhuang,Yan Yu
Utilizing biowaste shells (>95 wt% CaCO3) in chemical synthesis can both remediate environmental pollution and produce novel functional materials. Nonetheless, syntheses of nanomaterials from solid matter such as bio-shells are still rare. Herein, we for the first time reported the synthesis of a 0D/2D nanostructure, i.e., Ca(OH)2 nanosheets decorated with Mn3O4 quantum dots, from bio-shells in a green manner. Specifically, eggshells were calcined to form porous CaO that inherited a hierarchical framework from the source shell. The shell-derived CaO was then stirred together with KMnO4 in anhydrous ethanol at room temperature to generate the 0D/2D Ca(OH)2/Mn3O4 nanostructure (denoted as the Mn–Ca composite), in which Mn3O4 quantum dots were evenly dispersed on thin Ca(OH)2 nanosheets. Mechanism studies revealed that a trace amount of H2O released from the redox reaction between KMnO4 and ethanol regulated the slow hydrolysis and exfoliation of Ca(OH)2 nanosheets from the CaO framework. At the same time, the redox reaction generated Mn3O4 quantum dots that were deposited in situ on the Ca(OH)2 nanosheets, i.e., only where H2O was liberated and the hydrolysis of CaO took place. This mechanism allowed the uniform dispersion of Mn3O4 on the newly formed Ca(OH)2 nanosheets. Thanks to its unique 0D/2D structure, this Mn–Ca composite could highly efficiently extract trace-level Pb(II) from synthetic wastewater and outperformed many other Mn-based nanomaterials prepared purely from chemical reagents. This 0D/2D Mn–Ca composite possessed a high capacity for Pb removal (up to 1580 mg g−1 when the initial Pb(II) concentration was 1 g L−1), and it could also scavenge various other heavy metal ions such as Cu(II), Cd(II), Eu(III), Co(II), and Ag(I). Other biowaste shells such as oyster shells and clam shells also successfully produced a functional nanomaterial via the presented methodology. The current findings open a new way for biowaste recycling and may inspire the design of novel nanomaterials.
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APPLIED ENERGY
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2025
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IF 11
Zhuofan Han,Dengjie Zhong,Yunlan Xu,Haixing Chang,Lin Dong,Yi Liu
In this study, N-doped carbon quantum dots (N-CQDs)/ZnIn 2 S 4 /tubular g-C 3 N 4 (TCN)/Ti photoanode was successfully prepared by a simple one-pot solvothermal method and silica sol drop coating method, which was assembled with Cu x O/Cu cathode to construct photocatalytic fuel cell (PFC) to degrade organic pollutants and generate electricity. The photoanode material aims to promote the separation and uniform transfer of photogenerated electron through the synergistic effect of Schottky junction and S-type heterojunction of 0D quantum dots. The PFC with N-CQDs-doped photoanode possessed strong power generation capacity (71.10·μW-cm −2 ) and high photoelectric conversion efficiency (0.098 %), which were 1.72 and 1.94 times that of the PFC with ZnIn 2 S 4 /tubular g-C 3 N 4 /Ti photoanode. It degraded more than 95 % of rhodamine B, 83.44 % of tetracycline and 50.66 % of bisphenol A within 30 min. The excellent performance of the developed PFC is attributed to the synergistic effect of different heterojunction in photoanode, and the improvement of absorption and utilization of visible light by doping N-CQDs. Both free radicals (•OH, •O 2 − ) and non-free radicals (h + , 1 O 2 ) were involved in the degradation process of pollutants. It is noteworthy that, due to the Schottky junction, the N-CQDs could act as electron warehouses to promote the production of H 2 O 2 , which could enhance the degradation effect. We believe that this research provides a new direction for the development and research work on efficient photoanodes. Synopsis N-CQDs was introduced into PFC photoanode to construct the synergistic effect of Schottky junction and S heterojunction to simultaneously realize efficient pollutants degradation and power generation.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.7
Xiang Qin,Tiantian Yi,Rong Cao,Junchen Luo,Hui Luo,Lijun Ji
The development of efficient S-scheme heterojunctions was crucial for addressing the limitations of insufficient light absorption and rapid charge recombination in photocatalysis. In this study, a dual-synergistic 0D/2D/0D (001)TiO 2 /Ti 3 C 2 /ZnTCPP S-scheme heterojunction was rationally designed. The matched energy levels between (001)TiO 2 and ZnTCPP metalloporphyrin drove the formation of a robust built-in electric field, serving as the endogenous S-scheme charge separation core that preserved strong redox capacity. Meanwhile, the metallic Ti 3 C 2 MXene acted as an exogenous high-conductivity transport bridge, accelerating directional carrier migration to surface active sites. The composite was successfully fabricated via a hydrothermal method combined with electrostatic self-assembly. Comprehensive characterization by XRD, TEM, and XPS confirmed that (001)TiO 2 nanoparticles and amorphous ZnTCPP were uniformly anchored onto Ti 3 C 2 nanosheets, forming intimate 0D/2D/0D interfacial contacts with strong electronic interactions. The incorporation of ZnTCPP significantly extended the optical absorption into the visible region, while Ti 3 C 2 functioned as an efficient electron mediator and photothermal agent, further boosting reaction kinetics. Under visible-light irradiation, the optimized TTZ-2 composite exhibited exceptional dual-functional performance: a tetracycline degradation rate of 93.4% and a hydrogen evolution rate of 590.2 μmol·g −1 ·h −1 . Mechanistic investigations, supported by Kelvin probe force microscopy (KPFM) and density functional theory (DFT) calculations, revealed that the dual synergy between the endogenous built-in electric field and the exogenous Ti 3 C 2 channel synergistically facilitated the directional migration of photogenerated carriers along the S-scheme pathway, effectively suppressing recombination while preserving strong redox capabilities. This work demonstrated a viable strategy for designing multifunctional MXene-based photocatalysts for environmental remediation and solar energy conversion.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Yuhan Wang,Longzhen Ding,Chang Liu,Yao Lu,Qianyuan Wu,Chao Wang,Qing Hu
A series of environmental-friendly and cost-effective 0D/2D/2D ZnFe 2 O 4 /Bi 2 O 2 CO 3 /BiOBr double Z-scheme heterojunctions (abbreviated as xZnCB) were fabricated by a hydrothermal method using an electrostatic self-assembly strategy. The removal efficiencies toward tetracycline (TC), oxytetracycline (OTC), and doxycycline (DOX) were 93%, 90.1%, and 89.4% in 10ZnCB/sunlight/permonosulfate (PMS) systems within 20 min, and the degradation rate constants of 10ZnCB were 5.7–8.2 times higher than those of ZnFe 2 O 4 and 2.6–2.9 times higher than those of Bi 2 O 2 CO 3 /BiOBr (CB) under the same conditions. XPS valence band spectra, quenching experiments, EPR measurements, and density functional theory (DFT) calculations demonstrated the existence of the double Z-scheme heterojunctions. The coexistence of radical and non-radical pathways caused by photocatalytic and non-photocatalytic degradation mechanisms was also elucidated. PMS was effectively activated by a photoinduced e − , · O 2 − , and Fe(II)/Fe(III) pathway, and active species including · O 2 − , 1 O 2 , SO 4 · − , · OH, and h + participated in the catalytic processes. Unexpectedly, 1 O 2 , and · OH were determined to be the primary species during the degradation processes instead of SO 4 · − . Recycling experiments, metal leaching measurements, and TC degradation experiments in the secondary effluent demonstrated the excellent catalytic and structural properties of these xZnCB hybrid materials.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Xiao Chen,Yating Hou,Jinghan Xu,Ningyuan Song,Xinru Wei,Yanru Liu,Kang Liu,Yunmei Du,Lei Wang
Nowadays, the electrocatalytic regulation mechanism of quantum dots (QDs)-supported materials is limited to strong metal-support interaction (SMSI) and electron-metal-support interaction (EMSI). However, the lattice strain of the carrier induced by QDs is neglected, which is not conducive to the directional design of the QDs-supported electrode and the establishment of its structure-performance correlation. Given these, the size and distribution of Pt QDs controlled by electrodeposition effectively regulate the strain degree on S-NiFeP nanosheets. DFT results reveal that Pt@S-NiFeP/NF complies with a Fe-Pt dual active sites mechanism for alkaline HER, and a Fe active site mechanism for OER. Interestingly, the compressive strain in the S-NiFeP substrate effectively promotes the d‐band center shift and the energy barrier reduction, thereby optimizing the alkaline HER and OER kinetics. As expected, Pt@S-NiFeP/NF with appropriate strain owns alkaline HER and OER performance at 1 A cm −2 that exceeds the commercial Pt/C and RuO 2 . Overall, this work has guided the structural design of the 'noble metal QDs@carrier' model and laid a foundation for its application at ampere-level current densities.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Chenxi Ke,Yu Wu,Jiayao Ou,Hongda Zhu,Huiling Guo,Hongmei Sun,Mingxing Liu
Ochratoxin A (OTA) is a representative foodborne fungal toxin that poses great harm to humans, the ultra-sensitive detection of OTA is an urgent requirement for public health. In this work, a competitive colorimetric and ratio fluorescence dual-mode immunosensor for the detection of OTA based on 0D/2D AuAg NCs/SPCN/BGQDs heterojunction nanozyme was devised and fabricated. The presence of P-N heterojunctions was confirmed through electrochemistry and theoretical calculations, heterojunction formed between AuAg NCs-SPCN and BGQDs effectively augmented the oxidase-mimic activity, verified by enzyme kinetic analysis. Superoxide radicals (·O2-) were catalyzed by heterojunction nanozyme from dissolved oxygen, and o-phenylenediamine was oxidized by ·O2- to produce diaminophenazine. It exhibited an absorption peak at 450 nm overlapped with the emission peak of heterojunction nanozyme. The fluorescence at 434 nm was quenched through the IFE effect while the fluorescence at 565 nm was enhanced and accompanied by solution yellowing, so ratio fluorescence was formed due to two emission peaks and the dual-mode detection system was constructed. The dual-mode immunosensor exhibited exemplary linearity across the concentration span of 0.001–20 μg/L, with LODs of 0.28 ng/L (ratio fluorescence) and 0.2 ng/L (colorimetry) respectively. Therefore, this immunosensor demonstrated potential applications in food quality testing and visual analysis.
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