Journal of Materials Chemistry C
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2024
·
IF 5.7
Sheng Ding,Wei Gan,Jun Guo,Ruixin Chen,Run Liu,Ziwei Zhao,Jianrou Li,Zhaoqi Sun,Miao Zhang
In this study, the S-scheme heterostructure photocatalyst of SnS2/TiO2 (denoted as ST) ultrathin nanosheet-nanorod arrays with high efficiency for the degradation of tetracycline hydrochloride (TC-HCl) was successfully prepared by a two-step hydrothermal method. By expanding the light absorption area and hindering the reorganization of light-generated e--h+ pairs, the binding of TiO2 to SnS2 prepared photocatalysts with highly efficient photocatalytic activity and long-term stability. The results showed that the optimized photocatalyst samples all contributed to the degradation efficiency of tetracycline hydrochloride within 90 min than the photocatalytic degradation of pure TiO2 (41.1%). Among them, the ST loaded with 30 mM SnS2 exhibited the highest photocatalytic degradation efficiency of TC-HCl (93.4%). The reaction rate constant K is 0.02597 min-1, and the transient photocurrent density of ST-30 was up to 34.35 A/cm2, which were 5.78 and 10.54 times higher than that of unmodified TiO2. At the same time, the effects of photocatalysts on the degradation efficiency of TC-HCl under different conditions (pH values, inorganic anions and antibiotic concentrations) were systematically investigated. The inhibition of the degradation efficiency of tetracycline hydrochloride by SnS2/TiO2 heterojunction with the addition of different free radical scavengers indicated that ·O2- and ·OH were the main active substances involved in the degradation process. In addition, two environmentally friendly degradation pathways were proposed based on the analysis of liquid chromatography-mass spectrometry (LC-MS) results and the toxicity assessment of various intermediates in the degradation process. Finally, the photocatalytic mechanism of SnS2/TiO2 heterojunctions was proposed based on the optical and electrochemical properties of the photocatalysts as shown in the tests. These results indicate that the synthesized S-scheme heterostructure photocatalyst SnS2/TiO2 can significantly improve the light trapping ability and reduce the photoelectron-hole complexation rate, which is a promising approach to enhance the degradation efficiency of photocatalysts.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Xingyu Zhan,Yunxiong Zeng,Bo Hong,Xinqing Wang,Yingchun Xia
Artificial photosynthesis for H 2 O 2 production through O 2 reduction is a sustainable and cost-effective technology for the scientific and industrial communities. Metal-free polymeric carbon nitride (CN) is a promising visible-light responsive semiconductive material for photocatalytic H 2 O 2 production. However, its inherently disordered and amorphous structure limits its performance improvement due to high photogenerated carrier complexation and sluggish interlayer charge transfer. Here, we report a high-performance S-type heterojunction, composed of CeO 2 coupled with N -vacancy-rich CN (CeO 2 /Nv-CN), that enhances the photocatalysis of H 2 O 2 production under visible light. The prepared CeO 2 /Nv-CN showed an H 2 O 2 generation rate of up to 69.79 mmol·g −1 ·h −1 , 48.80-fold higher than CN and had an apparent quantum yield of 13.8 % at 400 nm. A synergistic effect among CeO 2 , N -vacancies (Nv) and S-type heterojunction is responsible for such an excellent activity, which increased the O 2 and light absorption sites, built rapid charge diffusion channels, and enhanced two-electron O 2 reduction. This work demonstrates the potential of incorporating nanosized CeO 2 with CN to achieve high-performance photocatalytic H 2 O 2 production, opening new avenues for designing highly efficient polymeric composite photocatalysts for energy conservation.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Ting Pan,Danni Wang,Yanyu Song,Yongdi Liu,Long D. Nghiem,Jun Duan,Chengdan Che,Xianbo Sun,Zhengqing Cai
This study synthesized MnFe 2 O 4 @S-ZnO with varying S-ZnO loading and investigated their catalytic activity towards Fenton degradation of norfloxacin (NOF). The MnFe 2 O 4 @S-ZnO/H 2 O 2 system achieved 98.3 % of NOF removal within 60 min, with the catalytic activity enhanced by 1.8 times compared to MnFe 2 O 4 . XPS results indicated that Mn and Fe are the active catalytic sites. The doping of S elements accelerated the reduction rates of Fe 3+ and Mn 3+ , thereby improving the utilization efficiency of H 2 O 2 and generating more •OH radicals. The Lewis acidic sites on the surface of MnFe 2 O 4 @S-ZnO coordinated with and reduced the concentration of OH − in the suspension, thereby increasing the acidity of theMnFe 2 O 4 catalyst surface, expanding the pH range of the Fenton reaction to alkaline conditions, allowing the composite material to maintain a NOF removal efficiency of over 90.0 % at even high pH (9.0–10.0). The presence of inorganic anions and humic acid (HA) played negative roles on the NOF degradation, but the MnFe 2 O 4 @S-ZnO/H 2 O 2 system can still achieve a minimum NOF degradation of 62.8 % within 60 min. Moreover, the MnFe 2 O 4 @S-ZnO catalyst exhibited relatively high stability and possessed easy recoverability. Furthermore, this catalyst overcomes the pH limitations of the traditional Fenton reaction, demonstrating significant advantages and promising application prospects.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2024
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IF 4.2
Min Yuan,Ke Huang,Dongqing Dai,Hongfei Yin,Wei Zhao,Yixin Jiang,Yahui Feng
The integration of heterogeneous photocatalysts has emerged as a promising approach to boost the effectiveness of photocatalytic reactions for hydrogen evolution. In this study, we explore the synergistic effects of Ti 3+ -TiO 2 /P-doped g-C 3 N 4 heterojunctions on the enhancement of visible light-induced hydrogen generation efficiency. The photocatalytic hydrogen evolution performance of the as-prepared TPCN100 (280.38 μmol g −1 h −1 ) surpasses that of pristine P-doped g-C 3 N 4 (34.89 μmol g −1 h −1 ) and Ti 3+ -TiO 2 (39.71 μmol g −1 h −1 ) by factors of 8.0 and 7.1 respectively. Through a comprehensive investigation of the structural, electronic, and photocatalytic properties, the underlying mechanisms accountable for the observed enhancement in efficiency within the heterojunction system were elucidated. Based on the in-situ X-ray photoelectron spectrometer (XPS) examination, measurement of band edge, and electron paramagnetic resonance (EPR) analysis, the S-scheme photocatalytic mechanism was proposed. The integration of Ti 3+ -TiO 2 and P-doped g-C 3 N 4 offers new insights into the design of advanced photocatalytic materials for sustainable energy applications.
研究领域:
材料科学
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能源化学
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环境科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Xinxin Yuan,Zhiling Huang,Jinhua Li,Yue Meng,Zhenhai Gu,Bo Xie,Zheming Ni,Shengjie Xia
The steric effect caused by the lattice mismatch between the two phases hinders the separation and transfer of photogenerated carriers, which is one of the important factors limiting the activity of heterojunction photocatalysts. In this paper, semi - coherent interface Cu2O/Cu7S4 heterojunction was successfully constructed based on the epitaxy growth method of anion exchange. The degradation of tetracycline by semi - coherent interface Cu 2 O/Cu 7 S 4 -30 heterojunction under simulated visible light reached 95.3 % at 60 min, which is a significant improvement compared with single-phase catalysts and ordinary heterojunction catalysts (Cu 2 O/Cu 7 S 4 -mix). The experimental characterization and theoretical calculations confirmed the existence of unique S-Cu-O chemical bonds in the semi - coherent interface Cu 2 O/Cu 7 S 4 heterojunction. On the basis of heterojunction energy band bending and the formation of built-in electric fields, the S-Cu-O bonds can act as a specific bridge to further facilitate the separation, transfer and delivery of photoelectrons and holes, which contributes to the generation of more oxidatively active species (mainly superoxide radicals and holes). In addition, based on experimental characterization and theoretical calculations, the intermediates, degradation pathways and photodegradation mechanisms of the degradation process have also been discussed in detail.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
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IF 6.7
Wei Zhao,Mengru Yan,Yantong Chen,Junyu Shen,Xuekun Hong,Feihu Mu,Shijie Li,Sujuan Zhang,Quan Wang,Benlin Dai,Yazi Liu,Cheng Sun
Public health and ecosystems are at risk due to the overuse and large discharge of pharmaceutical and personal care products (PPCPs) (e.g. carbamazepine). Herein, a MIL-68(In)-NH 2 /Bi 4 O 7 S-scheme heterojunction was first prepared through a two-step route for efficient and environmentally friendly photocatalytic carbamazepine degradation. 1.0-MIL-68(In)-NH 2 /Bi 4 O 7 displayed efficient photocatalytic performance, and the removal rate of 50 mg/L carbamazepine could reach 92.7% at 120 min, which was 3.6 and 2.9 times that of Bi 4 O 7 and MIL-68(In)-NH 2 , respectively, under visible light. Using LC-MS analysis and Gaussian software calculations, the degradation path of carbamazepine was explored in detail. A series of photoelectrochemical experiments revealed the efficient transfer of photogenerated charges in 1.0-MIL-68(In)-NH 2 /Bi 4 O 7 photocatalyst. The radical trapping experiments and ESR characterization suggested a reasonable S-scheme photocatalytic mechanism. In this heterojunction material, the excellent photocatalytic performance was attributed to the large surface area and S-scheme mechanism, which provides more active sites and separates the photogenerated charges rapidly.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 4
·655
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IF 5.719
Wenjing Yu,Bo Liu,Xiaojiao Zhao
To develop high-performance microwave absorption materials with the features of lightweight, thin thickness, broad bandwidth, and strong absorption, an ultralight Ni3S2@N, S-codoped graphene aerogel with a density of 13.5 mg/cm3has been fabricated by the use of metal-organic frameworks (MOFs) to directly initiate the gelation of graphene oxide strategy. In such a strategy, dual-functional 1D Ni-MOF nanorods not only act as the gelation agent but also afford the doping elements (N and S) originated from the organic species and the precursor for metal sulfide. Due to the synergistic effects of good impedance matching and multiple losses, the optimal reflection loss (RL) of as-prepared Ni3S2@N, S-codoped graphene aerogel reaches −46.9 dB at 17.1 GHz with only 2.0 mm and ultralow filling content (1.75 wt%). The maximum effective absorption bandwidth (EAB) reaches 6.3 GHz (11.7–18.0 GHz) at 2.38 mm, covering the whole Ku band. Moreover, the value of EAB with the RL less than −30 dB can be tuned to 12.2 GHz (5.8–18 GHz) at the absorber thickness ranging from 1.9 to 5.0 mm. This work provides insight for rational design and fabrication of multicomponent-containing graphene aerogels, showing the potential application in lightweight and high-performance microwave absorption.
研究领域:
材料科学
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电磁学
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化学工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Xiaoxue Liu,Ailin Gao,Tao Dong,Jiaming Li,Jian Liu,Changchao Jia
The photocatalytic reduction of CO 2 and H 2 O to form formic acid (HCOOH) holds promise for meeting the carbon–neutral target. However, the reduced efficiency of carrier separation and the material’s vulnerability to photo-corrosion significantly impede its practical application. Herein, a 0D/1D Cu 2 O/W 18 O 49 S-scheme heterostructure is prepared by in situ growing Cu 2 O nanocrystals on W 18 O 49 ultrathin nanorods via the wet chemistry method. In situ irradiation X-ray photoelectron spectroscopy characterization uncovered the formation of a stable internal electric field (IEF) at the heterojunction interface between W 18 O 49 and Cu 2 O, which facilitates the separation of photon-generated carriers through an effective interfacial S-scheme transmission mechanism. Small-sized Cu 2 O (5–10 nm) anchored on the ultrathin W 18 O 49 nanorods exposes abundant active sites and enhances carrier separation while inducing electrons generated from W 18 O 49 to consume the holes in Cu 2 O, thus preventing the oxidation of Cu 2 O. The W 18 O 49 /Cu 2 O S-scheme heterostructure with the optimized composite ratio (40 % Cu:W) exhibited excellent performance in HCOOH production (56.42 μmol g −1 h −1 , 23.2-fold enhancement compared to pristine Cu 2 O) and 100 % selectivity for CO 2 photoreduction in water without any sacrificial reagents. This work provides a rational method for improving the stability of the catalyst and regulating charge carrier migration for highly selective CO 2 photoreduction in water.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
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2025
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IF 13.5
Fanpeng Meng,Fei Zhao,Jingkai Lin,Jinsheng Zhao,Huayang Zhang,Shaobin Wang
Designing heterojunctions based on carbon nitride offers a promising pathway for enhancing photocatalytic efficiency. This study develops an all-organic S-scheme metal-free heterojunction uniquely composed of carbon nitride nanosheets (GCNNS) and a donor–acceptor conjugated polymer, poly p-aminobenzylidene-so-aniline (PASO), synthesized through a simple yet effective ball-milling technique. This heterojunction demonstrates excellent photocatalytic efficiency for hydrogen (H 2 ) evolution. The optimized GCNNS/PASO-10 sample attains an H 2 evolution rate of 10.12 mmol∙g −1 ∙h −1 , which is about 5.9 times and 19.5 times greater than those of pure GCNNS and PASO, respectively. This improvement is due to the unique interfacial bonding, increased visible-light absorption, and efficient charge carrier separation facilitated by a strong internal electric field within the S-scheme. Theoretical calculations and characterization reveal that this heterojunction’s S-scheme mechanism optimally aligns energy bands and promotes spatial charge separation, driving superior photocatalytic activity. This work presents the unique advantage of all-organic materials for heterojunction construction and provides insights into designing advanced S-scheme systems for sustainable energy conversion.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Guoqiang Zhang,Jianqing Li,Zhiqi Wang,Xi Xu,Tao He,Jingli Wu,Jinhu Wu
The cocatalysts play a key role in photocatalytic technology in remarkably improving the efficiency of H 2 evolution. Herein, S vacancies-rich Cd 0.6 Zn 0.4 S nanorods (CZS NRs) were prepared via solvothermal method. Then, as-obtained CZS NRs were modified with Ni–Co PBA-derived NiS x nanoparticles (NPs) cocatalyst using grinding method. The optimized CZS/NiS x -N-1.5 hybrids (CZS/NiS x -N, where N represents nickel nitrate which was used as nickel source) exhibited outstanding stability and activity, the average rate of H 2 was up to 192.82 mmolg −1 h −1 in deionized water medium, which was 201.4% higher than that of CZS. Besides, NiS x -A and NiS x -C cocatalysts with different particle sizes were obtained using nickel acetate (A) and nickel chloride (C) as nickel source, respectively. The CZS/NiS x -C-1.5 and CZS/NiS x -A-1.5 exhibited the H 2 evolution rate of 180.70 and 201.93 mmolg −1 h −1 in deionized water medium, respectively. The as-prepared materials also exhibited the excellent H 2 evolution performance in natural seawater medium. Besides, the photocatalytic mechanism of H 2 evolution over CZS NRs/NiSs NPs was also discussed. This work develops a novel H 2 evolution cocatalyst and unveils the relationship between the loading amount/particle size of cocatalyst on the H 2 evolution rate.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Yan Wang,Xi Wu,Qiaoling Yang,Yuqi Zhao,Hengliang Wang,Arturo Pajares,Jinying Zhang,Jiahong Wang,Wai-Yeung Wong,Xin Wang
Designing ternary heterojunction photocatalysts is regarded as a compelling approach to attain exceptional photocatalytic activity. However, they always suffer from poor interfacial contact and unclear charge transfer pathways. Herein, a metal-free dual S-scheme heterojunction photocatalyst comprised of black phosphorus (BP), carbon nitride (CN), violet phosphorus (VP) was designed by electrostatic self-assembly. The non-metallic feature of the BPCNVP heterostructure facilitates to form strong interfacial contact by coordinating active P sites in VP and BP with N atoms in CN. Notably, a definite dual S-scheme heterojunction configuration is achieved by rational band alignment of VP and BP, respectively, which significantly boosts the driving force for charge separation. The BPCNVP heterostructure exhibited a hydrogen evolution rate of 1669μmol h -1 g −1 with excellent stability, surpassing most reported metal-free photocatalysts. This work demonstrates that the design of dual S-scheme heterojunction by metal-free materials provides valuable insights into the intricate reaction mechanism of ternary heterojunction photocatalysts.
研究领域:
材料科学
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能源科学
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环境科学
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产品关联
DOI
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 36
·17009-17023
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IF 5.8
Congcong Wang,Suili Shi,Boya Liu,Guorong Wang,Zhiliang Jin
Rational design and synthesis of a unique heterojunction photocatalyst structure is an important strategy to enhance its performance and structural stability. Herein, Co9S8/MnCdS/Co3O4 photocatalysts with double S-scheme heterojunctions were successfully prepared by coupling Co9S8 and Co3O4 sheet structures with n-type MnCdS nanoparticles through a simple solvothermal and mechanical mixing method. The construction of the dual S-scheme heterostructure offers the possibility to expand the light absorption range, extend the carrier lifetime and maximise the redox capacity. In addition, the mechanism of charge transfer and the reason for the improvement of photocatalytic activity were explored through photoelectrochemical characterization. The lamellar structures of Co9S8 and Co3O4 not only provide excellent dispersion and slow down the agglomeration of MnCdS nanoparticles, but also promote charge transfer, which improves the photocatalytic hydrogen production effect. Under simulated solar irradiation, the evolution rate of H2 after 5 h was as high as 46.44 μmol, which was 3.49 and 1.49 times higher than those of pristine MnCdS and MnCdS/Co3O4, respectively. Meanwhile, it has good stability under 20 h irradiation. This work demonstrates a novel idea for the rational design of double S-scheme photocatalysts with efficient space separation.
研究领域:
材料科学
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光催化
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）