JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Xiaoyun Qiao,Tingsong Zhang,Huibin Zhang,Zeshan Xiong,Runwei Wang,Zongtao Zhang,Shilun Qiu
In this paper, a novel host–guest assembly strategy is developed to incorporate TiO 2 nanoparticles and CdS quantum dots (CdS QDs) into the photoactive dendritic porphyrins mesoporous silica nanospheres (DPMSN) channels for establishing heterojunctions nanoreactors (designated as DPMSTNC). The well-defined dendritic architecture facilitates the high dispersion of TiO 2 /CdS heterojunctions within the DPMSN matrix, effectively maximizing the interfacial contact area between the heterojunction components and the cobalt porphyrin framework. Crucially, the synergistic interplay of cobalt porphyrins incorporated in the silica framework and the ultra-small TiO 2 /CdS heterojunction in the dendritic channels promotes efficient charge transfer and separation in the nanoreactor. The optimized DPMSTNC nanoreactor exhibits excellent catalytic performance with a conversion of 96.0 % and a selectivity of 92.0 % in styrene oxidation, which significantly surpasses that of single-component catalysts and simple composite heterostructure catalysts. This nanoreactor design strategy, which combines spatially confined heterojunctions with photoactive porous frameworks, provides a novel and versatile platform for developing high-efficiency photocatalytic systems through precise nanoarchitectural control.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
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IF 4.233
Haixin Zhao,Shu Cui,Lan Yang,Guodong Li,Nan Li,Xiaotian Li
Photocatalysts with a hierarchically porous structure have attracted considerable attention owing to their wide pore size distribution and high surface area , which enhance the efficiency of transporting species to active sites. In this study, hierarchically meso-macroporous TiO 2 photocatalysts decorated with highly dispersed CdS nanoparticles were synthesized via hydrolysis, followed by a hydrothermal treatment . The textural mesopores and interconnected pore framework provided more accessible active sites and efficient mass transport for the photocatalytic process. The light collection efficiency was enhanced because of multiple scattering of incident light in the macropores. Moreover, the formation of a heterojunction between the CdS and TiO 2 nanoparticles extended the photoresponse of TiO 2 to the visible-light range and enhanced the charge separation efficiency. Therefore, the hierarchically meso-macroporous TiO 2 /CdS photocatalysts exhibited excellent photocatalytic activity for the degradation of rhodaming B under visible-light irradiation. Trapping experiments demonstrated that superoxide radicals ( O 2 − ) and hydroxyl radicals ( OH) were the main active species in photocatalysis . A reasonable photocatalytic mechanism of TiO 2 /CdS heterojunction photocatalysts was also presented.
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
Analytical Methods
·
2021
·Vol. 13
·期 25
·2857-2864
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IF 2.896
Lan Wang,Huan Zhang,Hang Shi,Baodan Jin,Xiaoyun Qin,Geng Wang,Kucong Li,Tingting Zhang,Hongzhong Zhang
In this study, we develop a highly sensitive and selective photoelectrochemical (PEC) sensor for bisphenol A (BPA) determination by combining a TiO2/CdS heterostructure with inorganic framework molecular imprinting (MI) technology. A MI-TiO2/CdS heterostructure was synthesized via successive ionic layer adsorption combined with an inorganic framework molecular imprinting method. Due to the matched energy level distribution of TiO2 with CdS, the formed heterojunction promotes photogenerated charge separation and enhanced PEC conversion. The MI-TiO2/CdS based PEC sensor exhibits higher photocurrent responses and perfect selectivity for BPA under simulated sunlight irradiation. Benefiting from the unique heterostructure and special recognition ability of MI-TiO2/CdS, the photocurrent is linear to the concentration of BPA (range from 1 to 100 pmol L−1), with a low limit detection of 0.5 pmol L−1 (S/N = 3). Meanwhile, the detection results show that the PEC sensor exhibits excellent sensitivity, high selectivity, and good stability. Furthermore, the PEC sensor was successfully applied to the real environmental sample detection of BPA, in lake and river water, domestic wastewater and tap water. This PEC sensor exhibits favourable BPA detection, and it is also a promising method by which to measure other similar environmental substances selectively and sensitively in future work.
研究领域:
环境科学
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材料科学
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分析化学
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Chen Yang,Hongyan Zhang
In this paper, a high-performance impedance humidity sensor based on defect control TiO 2 /CdS heterostructure was synthesized by hydrothermal method , and the influence of surface vacancy defects on sensing performance was analyzed by first principles based on density functional theory (DFT). Calculation results show that a large number of surface oxygen and sulfur vacancies appear on the surface of TiO 2 and CdS, resulting in a great enhancement of the physical/chemical adsorption energy of TiO 2 and CdS on water molecules, which is conducive to TiO 2 /CdS to capture more water molecules and improving the humidity sensitivity performance of the sensor. Experiments show that the regulation of surface vacancy defects of composite materials can effectively improves responsivity , linearity and hysteresis of TiO 2 /CdS humidity sensor. Compared with TiO 2 and CdS, the TiO 2 /CdS humidity sensor exhibits high sensitivity (63459), fast response/recovery time (7/5 s), low hysteresis (∼3.5 %), good repeatability and long-term stability in a range of 11–95 % RH. This study not only provides an idea for designing defective TiO 2 /CdS high-performance humidity sensors, but proposes a new understanding for exploring the underlying mechanism of sensor performance.
研究领域:
材料科学
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传感技术
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表面化学
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理论物理
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产品关联
DOI
高影响因子
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