ACS Sustainable Chemistry & Engineering
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2017
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IF 5.951
Qiaoying Li,Zhipeng Guan,Di Wu,Xiuge Zhao,Shenyuan Bao,Baozhu Tian,Jinlong Zhang
Although semiconductor photocatalysis has made great progresses as a promising solution to solve the problem of environmental pollution, the highly efficient decomposition of organic pollutants driven by sunlight is still a challenge. Herein, we successfully constructed a Z-scheme photocatalyst BiOCl-Au-CdS for the first time by stepwise deposition of Au and CdS. It was found that the Au nanoparticles (NPs) were selectively anchored on the {001} facets of BiOCl nanosheets in the process of photoreduction while CdS NPs were further in situ deposited on Au NPs via the strong S–Au interaction. Compared to BiOCl, BiOCl-Au, and BiOCl-CdS, the Z-scheme BiOCl-Au-CdS exhibited evidently higher sunlight-driven photocatalytic activity toward the degradations of anionic dye Methyl Orange, cationic dye Rhodamine B, colorless pollutant phenol, and antibiotic sulfadiazine. The radical trapping experiments indicated that ·OH, h+, and ·O2– are the main reactive species responsible for the degradations of organic pollutants over BiOCl-Au-CdS. Based on the photoelectrochemical measurements, PL spectra, and band potential calculation, it can be concluded that the Z-scheme structure of BiOCl-Au-CdS not only retains the photogenerated electrons and holes with higher redox ability but also decreases their recombination rate. As a highly efficient sunlight driven photocatalyst, BiOCl-Au-CdS can be potentially used in environmental pollutant remediation.
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高影响因子
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
·
2022
·
IF 0.847
Ruiqi Gao,Huan He,Junxian Bai,Lei Hao,Rongchen Shen,Peng Zhang,Youji Li,Xin Li
ABSTRACT Nowadays, conjugated polymers have garnered numerous attention as a new class of organic photocatalysts due to their tunable electronic properties, low cost, excellent stability and sufficient light-absorption performance. In particular, pyrene-benzothiadiazole-based conjugated polymer (PBBP) has been considered to be a new type of conjugated polymers for photocatalytic H 2 evolution. However, the poor charge separation seriously limits its practical application in H 2 evolution. In this work, a PBBP-based polymer/CdS 2D/2D organic/inorganic S-scheme heterojunction photocatalyst with a strong internal electric field is, for the first time, prepared for efficient photocatalytic hydrogen evolution. The pyrene-benzothiadiazole-based conjugated polymers (PBBP) are synthesized by the Suzuki-Miyaura reactions. Then, the hybrid heterojunction photocatalysts are fabricated by coupling CdS with it through the ultrasonic mixing method. As a result, the highest H 2 -production rate of 15.83 mmol h −1 g −1 is achieved on 20% PBBP/CdS composite under visible-light irradiation, nearly 2.7 times higher than that of pure CdS. The apparent quantum efficiency (AQE) of 20% PBBP/CdS composite could reach 8.66% at λ = 420 nm. The enhanced activity could be attributed to the construction of S-scheme heterojunction, which accelerates the recombination of carriers with weaker redox ability and maintains the strong reducibility of electrons in CdS. This work provides a protocol for pyrene-benzothiadiazole-based conjugated polymers to prepare S-scheme heterojunction photocatalysts based on organic/inorganic coupling.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
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IF 4.175
Wenjian Shen,Jing Zhang,Shiyu Wang,Heping Du,Yiwen Tang
Interface passivation layer deposited onto photoanodes has been proven to be an available way to suppress charge recombination and enhance the power conversion efficiency in quantum dot-sensitized solar cells. In this work, the ZnS-MnS composites layers inserted in ZnO/CdS nanotubes photoanodes interface is firstly fabricated via ion-exchange and chemical bath deposition methods, simultaneously. By inserting the ZnS-MnS composites, electron back transfer is efficiently hindered. In addition, the uniform ZnS-MnS layer effectively blocks the direct contact between the polysulfide electrolyte and ZnO nanotubes, which inhabits the recombination of electron-hole pairs occurred at the interface. Besides, the MnS layer is in favour of the CdS quantum dots in higher load, profiting the light absorption intensity in the visible light region. Thus ZnO/ZnS-MnS/CdS nanotubes quantum dot-sensitized solar cells have efficiency of 3.62%, which is much higher than that of the solar cell with ZnS passivation layer (2.33%). This work demonstrates that constructing ZnS-MnS interface passivation layer with a proper band gap structure is a promising approach to enhance the performance of quantum dot-sensitized solar cells.
研究领域:
材料科学
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纳米技术
·
太阳能
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Xuli Li,Yangqin Gao,Ning Li,Lei Ge
Designing an efficient heterojunction interface is an effective way to promote the electrons' transfer and improve the photocatalytic H 2 evolution performance. In this work, a novel hollow hybrid system of Co@NC/CdS has been fabricated and constructed. CdS nanospheres are anchored on the hollow-structured cobalt incorporated nitrogen-doped carbon (Co@NC) through a one-pot in-situ chemical deposition approach, forming an intimate interface and establishing an excellent channel to improve the electrons transfer and charge carriers separation between CdS and Co@NC cocatalyst , which immensely promotes the photocatalytic activity . The rate of photocatalytic H 2 evolution over hollow structured Co@NC/CdS heterojunction can be achieved 8.2 mmol g −1 h −1 , which is about 45 times of pristine CdS nanospheres . The photocatalytic H 2 evolution mechanism has been investigated by the techniques of photoluminescence (PL) spectra, photocurrent-time (i-t) curves, electrochemical impedance spectroscopy (EIS) etc. This work aims to provide a new way in developing of high-performance advanced 3D heterojunction for photocatalytic hydrogen evolution .
研究领域:
材料科学
·
能源化学
·
光催化
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Aiping Wu,Chungui Tian,Yanqing Jiao,Qing Yan,Guoyu Yang,Honggang Fu
The visible-light driven, Pt-free photocatalytic H 2 evolution (PHE) is promising for clean and sustainable H 2 production. The construction of the heterojunction structure with intimate contact and good light adsorption ability is important for realizing the high effective PHE. Here, the core-shell structured MoS 2 /CdS hybrids were constructed through “sequential two-step hydrothermal growth” route for Pt-free PHE. In the synthesis, the hierarchical flower-like MoS 2 was firstly obtained through the reaction of ammonium molybdate and excessive thiourea. Subsequently, without need of centrifugation, the cadmium acetate (Cd source) was added into the cooled MoS 2 solution directly followed by a secondary hydrothermal reaction. In the process, the Cd 2+ could react with partially S 2− in MoS 2 (substituted reaction) and with the excessive S 2− ions in solution to generate CdS, resulting in the formation of CdS shell contacted with MoS 2 core. The micro-structure of the composites (such as the thickness and morphology of CdS shell) could be tuned by changing the amount of Mo source and Cd source. In the composites, the CdS on the outside is convenient to absorb the solar light. The intimate contact of CdS and MoS 2 is beneficial to charge transfer. As a result, the MoS 2 /CdS catalyst showed high catalytic activity for PHE under visible light irradiation (λ > 420 nm). The H 2 evolution rate could reach to 775 μmol h −1 (20 mg catalyst), which is much higher than pure CdS (12 μmol h −1 ) and Pt-CdS (64 μmol h −1 ). The good activity should be related with CdS outside shell beneficial for light adsorption and intimate contact of CdS and MoS 2 for easy charge transfer. A series of experiments demonstrate that the formation of the heterojunction can effectively enhance the charge transfer ability and retard the recombination of electron-hole pairs, thus improving PHE activity and alleviating the photocorrosion of CdS component.
研究领域:
材料科学
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光催化
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能源化学
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纳米材料
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可持续能源
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高影响因子
ChemCatChem
·
2024
·Vol. 17
·期 3
·e202401364
·
IF 3.8
Haixia Li,Dan Li,Chuanqiang Yin,Feigao Xu
Graphical FeP/CdS Z-type heterojunction photocatalysts were successfully prepared by a facile hydrothermal method. Experimental results demonstrated that FeP/CdS composite photocatalysts have excellent performance in the catalytic degradation of TCH with the help of activated H 2 O 2 .The construction of Z-type heterostructures provided an effective photogenerated electron transfer channel, which facilitated its separation and utilization as well as accelerated the cycling of Fe 3+ /Fe 2+ . Photocatalysis is an efficient technology for the degradation of pollutants. However, it still needs to be improved. In this study, magnetic Z-scheme FeP/CdS composites heterojunction photocatalysts were prepared by a facile hydrothermal method, and the structure, morphology, optical, and photocatalytic properties of the prepared composites were investigated in detail. The efficiency of tetracycline hydrochloride (TCH) removal by FeP/CdS composites was investigated under different reaction conditions (including different FeP and CdS ratios, catalyst dosage, hydrogen peroxide consumption, temperature, and initial pH). FeP/CdS composites exhibited better catalytic performance compared with pure components. The F 1 Cd 1 composite (mass ratio of FeP to CdS is 1:1) achieved 92.7% removal efficiency of TCH; moreover, the F 1 Cd 1 composite still exhibits a high stability after five consecutive cycles. The capture experiments on the active material showed that the removal of TCH by the F 1 Cd 1 composite was mainly dominated by •OH; however, •O 2 − , e − , and h + played a minor role, and the degradation mechanism was revealed by combining various characterization techniques. The introduction of cadmium sulfide formed an effective photogenerated carrier transport channel at the interface with the iron phosphide surface, which could accelerate the transfer and separation of photo-excited e − /h + pairs, thus improving the degradation performance of TCH.
研究领域:
环境科学
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材料科学
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高影响因子
MICROCHEMICAL JOURNAL
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2026
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IF 5.2
Yujie Xiao,Zhenxi Liu,Litong Yu,Xiaofeng Lv,Juan Du,Baozhan Zheng,Yong Guo
A stable B, N-CDs@SiO 2 RTP composite was constructed via silica confinement. • The composite shows blue fluorescence and green phosphorescence with 15 s afterglow. • A UV–Vis/fluorescence/phosphorescence tri-mode platform was developed for TNP sensing. • Portable RTP-foam enables visual and semi-quantitative on-site TNP detection. The development of optical probes with multimodal responses is of great significance for improving the reliability of hazardous pollutant detection. Herein, a room-temperature phosphorescent (RTP) composite based on B/N co-doped carbon dots (B/N-CDs) confined within a SiO 2 ) matrix (B/N-CDs@SiO 2 ) was developed for the tri-mode detection of 2,4,6-trinitrophenol (TNP). B/N-CDs@SiO 2 exhibited blue fluorescence at 450 nm and green phosphorescence at 520 nm, with an average phosphorescence lifetime of 1.91 s and a visible afterglow lasting approximately 15 s, together with satisfactory optical stability. Interestingly, B/N-CDs@SiO 2 exhibits excellent response to TNP in both UV–vis absorption, fluorescence, and phosphorescence, thereby establishing a tri-mode sensing platform for TNP detection with detection limits of 1.81 μM, 0.32 μM, and 0.54 μM, respectively. The probe also demonstrates high selectivity for TNP over common ions and structurally related aromatic compounds, along with strong anti-interference capability. In spiked recovery tests in kinds of real samples, the satisfactory recoveries ranging from 91.2% to 108.9% (RSD: 0.34% to 3.74%) demonstrating its higher detection accuracy. Finally, the composite can be immobilized onto polyurethane foam to construct a portable visual sensing platform, which also successfully enabled the tri-mode and semi-quantitative detection of TNP. This work opens up a new avenue for the development of multi-signal detection systems for expanding their practical applications. Schematic illustration of the synthesis of B/N-CDs@SiO 2 and its application in TNP tri-mode sensing construction for TNP visual detection. Download: Download high-res image (187KB) Download: Download full-size image
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Chemosensors
·
2026
·Vol. 14
·期 7
·156
·
IF 4.4
Tong Xiang,Chongyang Zhang,Qiongqiong Ren,Jinlong Chang,Linyan Xie,Xuming Sun
Nitrite (NO2−) is a crucial environmental and food safety indicator, and excessive intake poses severe threats to human health; thus, highly sensitive and selective detection methods are urgently needed. Herein, a ratiometric fluorescent nanosensor based on N-CDs@UiO-66-NH2was constructed via a facile assembly strategy for sensitive and selective nitrite detection. The composite demonstrated dual-emission fluorescence at 456 nm and 730 nm under 365 nm excitation, originating from UiO-66-NH2and N-CDs, respectively, enabling an intrinsic self-referencing signal. The fluorescence intensity ratio exhibited a good linear response toward nitrite in the range of 10–100 μM and 100–450 μM with a limit of detection (LOD) 1.76 μM. The nanosensor showed high selectivity and anti-interference ability against various ions and molecules. Furthermore, it was successfully applied to nitrite detection in lake water samples with satisfactory recoveries (97–101%) and low relative standard deviations (<1.8%). This work provides a simple and effective approach for nitrite monitoring in environmental samples.
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高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 6
·125013
·
IF 7.5
Wenjie Guo,Yinghua Lan,Wenbing Wu,Jien Niu,Yanmei Chen,Wenlong Xiang,Juan Xu,Yanhui Zhang
By combining the sol-gel method with the coprecipitation synthesis strategy, a series of cadmium sulfide-based catalysts (MTiO x -CdS, where M = Ce, Co, Cu, Zn) were successfully prepared. Under simulated sunlight irradiation, the material exhibited efficient and stable degradation performance for ciprofloxacin (CIP). Remarkably, by constructing a Cr(Ⅵ)-mediated redox system, a significant leap in degradation efficiency from nearly zero to 90% was achieved for bisphenol A (BPA) and ibuprofen (IBU). Studies reveal that Cr(Ⅵ) plays a dual role in this system, acting as both an "electron bridge" and an "adsorption anchor": on one hand, it serves as an electron acceptor to significantly inhibit charge carrier recombination; on the other hand, it enriches pollutants through coordination effects, thereby synergistically enhancing electron transfer and interfacial reactions. This work not only presents a cost-effective and efficient strategy for the synthesis of MTiO x -CdS photocatalysts but also offers valuable insights into the development of novel photocatalytic systems aimed at the remediation of complex water pollution and energy conversion applications.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Yinghao Du,Dong Hao,Wei Yan,Jing Xu,Yuee Xie,Xiaohong Yan,Yuanping Chen
To address the limitations of traditional chemical methods and powder catalysts in photocatalysis, this study reports a novel physical vapor deposition (PVD) approach for constructing efficient and recyclable heterojunctions. Using electron-beam evaporation, the amorphous NiO film was deposited onto the surface of chemically synthesized TiO 2 /CdS precursors, ultimately yielding the flexible TiO 2 /CdS/NiO (TCN) multi-composite photocatalyst. The light absorption, charge carrier behavior, and degradation mechanism were investigated through UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), photoelectrochemical testing, and free radical trapping experiments. The prepared TCN composite material achieved a degradation efficiency of 96% for methyl orange (MO) within 60 min of visible-light irradiation, significantly outperforming pure TiO 2 (17%) and TiO 2 /CdS (41%). It also demonstrates broad-spectrum degradation capabilities for multiple antibiotics and exhibits excellent cycling stability. Mechanistic analysis indicates that both a Type-II heterojunction (TiO 2 /CdS) and a p-n heterojunction (CdS/NiO) are formed within the material. The built-in electric fields in both junctions are aligned, thereby synergistically promoting the efficient separation and migration of photogenerated electron-hole pairs. This work provides a new technical pathway and theoretical basis for designing practical, easily recyclable and highly efficient photocatalytic materials that minimize secondary pollution.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2026
·
IF 4.8
Hao Xue,Tianyi Ma,Hong Zheng,Luoyilan Zhang,Ke Cheng
Biomass-derived fluorine and nitrogen co-doped carbon dots (F, N-CDs) were synthesized via a one-step hydrothermal method using Rhododendron simsii flowers as the precursor. The prepared F, N-CDs exhibited favorable optical properties, good water solubility, and a pronounced enhancement effect on the chemiluminescence (CL) of the Luminol-K 2 S 2 O 8 -NaOH system. The optical characteristics were systematically investigated by UV–Vis absorption spectroscopy, fluorescence spectroscopy, and fluorescence lifetime analysis. The possible CL enhancement mechanism was further investigated through reactive oxygen species scavenging experiments and singlet oxygen probe experiments. On this basis, an enhanced flow-injection chemiluminescence (FI-CL) method was developed for the determination of levetiracetam (LEV). Under the optimized conditions, the relative CL intensity exhibited a satisfactory linear relationship with LEV concentration over the range of 0.10–10.00 mM, with a limit of detection (LOD) of 2.02 × 10 −3 mM and a limit of quantification (LOQ) of 6.71 × 10 −3 mM. The proposed method was successfully applied to the commercial LEV pharmaceutical formulations, giving recoveries of 94.8–103.1% and relative standard deviations (RSDs) below 4.68%. These results demonstrate the potential of biomass-derived carbon dots for spectroscopic and characterization and chemiluminescence-based analytical applications.
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PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2026
·
IF 4.6
Ying Yan,Qianwen Zhang,Yuxin Shu,Zeyu Zuo,Shuoyue Li,Mama Embalo Samba,Wenxuan Xu,Lankun Cai
Photocathodic protection (PCP) provides a sustainable strategy for corrosion control, but conventional TiO 2 /CdS photoanodes remain limited by inefficient interfacial charge transfer and CdS photocorrosion. Herein, TiO 2 /Mn-CdS composite photoanodes were fabricated via anodic oxidation combined with the successive ionic layer adsorption and reaction (SILAR) method for the photocathodic protection of Q235 carbon steel (Q235 CS). The optimized photoanode, prepared using a 0.04 M Mn precursor solution (denoted as TiO 2 /Mn-CdS-0.04), exhibited a photocurrent density of 1590 μA·cm −2 . When coupled with Q235 CS, it induced a cathodic shift of the open-circuit potential to −1.30 V (vs. SCE) under visible-light irradiation. During a 24-day stability test, the photocurrent density remained above 1000 μA·cm −2 and the coupled potential remained approximately −0.95 V (vs. SCE). First-principles calculations indicated that Mn-induced electronic states facilitated carrier separation and interfacial charge transfer, suggesting that Mn incorporation promotes cascade charge transfer within the composite photoanode. This study demonstrates the potential of TiO 2 /Mn-CdS as a non-noble-metal photoanode for durable photocathodic protection of Q235 CS.
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