INTERNATIONAL JOURNAL OF PHOTOENERGY
·
2014
·
IF 0
Sujing Yu,Juncheng Hu,Jinlin Li
Self assembly of TiO2/CdS mesoporous microspheres was synthesized via hydrothermal method. The samples were characterized by X-ray powder diffraction (XRD), ultraviolet-visible diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), energy-dispersive spectroscopy analysis (EDS), high-resolution transmission electron microscopy (HRTEM), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), and photoluminescence spectra (PL). The as-synthesized TiO2/CdS mesoporous microspheres showed superior photocatalytic activity for the degradation of RhB under either visible light or simulated sunlight irradiation; the 10 wt% TiO2/CdS sample showed the best performance. Moreover, this catalyst showed improved stability, and the activity did not decrease significantly after four recycles. The heterojunction between TiO2 and CdS may be favorable for the transport of photoinduced electrons from CdS to TiO2. In addition, the mesoporous structure could increase the utilization of light energy and facilitate the diffusion of reactants and products during the photocatalytic reaction.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Yunxia Bai,Mei Li,Xuemei Liu,Jinyu Han,Xinli Zhu,Qingfeng Ge,Hua Wang
Photocatalytic CO2 reduction is a promising route to simultaneously address two critical issues related to the energy and environment. Herein, a direct Z-scheme photocatalytic system, Ti3+ defective TiO2/CdS nanoflowers, was fabricated to enhance the production of C1–C3 products from CO2 reduction. First, nanoflower-like TiO2 (NF-TiO2) is prepared using a TiB2 precursor to build in Ti3+ defects. Then, the NF-TiO2/CdS heterojunctions are constructed via the sulfurization of TiO2/Cd-MOF. Importantly, the optimal heterojunction photocatalyst NF-TiO2/CdS0.6 exhibits a highly promoted CO2 reduction activity not only for CO and CH4 but also for C2–C3 hydrocarbons. The cumulative yields of CO and CH4 are 1007.0 μmol/g and 83.5 μmol/g (2.5 h), respectively, and a yield of 55.3 μmol/g (2.5 h) of C2–C3 hydrocarbons is obtained. This enhanced yield of C1–C3 products is attributed to the synergistic effects of abundant Ti3+ defects that increase adsorption and activation of CO2, the large surface area that provides sufficient active sites, and a direct Z-scheme heterojunction with a good intimate contact interface that effectively separates charge carriers and accumulates electrons with strong reducibility. Moreover, the photoluminescence analysis of hydroxyl radicals was conducted to provide evidence for the direct Z-scheme mechanism. This work provides a facile method for the construction of a TiO2-based direct Z-scheme photocatalytic system for improving photocatalytic performance toward CO2 reduction.
研究领域:
材料科学
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环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Xiaobo Han,Junting Yang,Hengbin Zhao,Qingchun Wang,Fei Ruan,Weixiang Shang,Jinxiao Bao,Yuwei Ma
The construction of a heterojunction with multichannel charge transfer represents an effective strategy for achieving efficient visible light photocatalytic hydrogen production. In this study, the TiO 2 /CdS/Co 2 P ternary photocatalyst was synthesized by stepwise assembly method. The UPS and work function(Φ) results confirmed the band structure and associated band bending of TiO 2 /CdS/Co 2 P, the multichannel electrons transfer from CdS to TiO 2 and CdS to Co 2 P can induce more charge carriers to participate in photocatalytic reaction. Moreover, combine with the results of 3D model charge density and photoelectric performance characterization, proves that the as-prepared ternary photocatalyst accelerates the transfer of photo-generated electrons and reduces the charge recombination rates. According to the Gibbs free energy results, Co as the additional active site is beneficial for hydrogen desorption, thus achieving a high hydrogen production result. Based on the synergistic effects, TiO 2 /55CdS/5.5Co 2 P presented a relatively high hydrogen evolution rate of 250.9 μmol h −1 under the visible light irradiation (λ ≥ 420 nm), which is almost 2 times higher than CdS/5.5Co 2 P (122.8 μmol h −1 ). This work provides theoretical guidance and practical insights for constructing ternary heterojunction structures with central-to-bilateral electron migration to achieve efficient visible-light photocatalytic hydrogen production.
研究领域:
材料科学
·
能源科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
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
·
环境科学
✓ 已验证
DOI
高影响因子
TRANSITION METAL CHEMISTRY
·
2025
·
IF 1.7
Zhang Zhichao,Zhang Jianbo,Li Kangzheng,Tang Binglin,Wang Xiaohui,Tan Ling,Hu Yijie,Luo Qingcheng,Yin Zhe,Yu Guoping,Lv Bo
Natural mineral composite catalysts have attracted much attention due to their great potential in the fields of water treatment, air purification and energy conversion. In this study, porous TiO 2 materials were synthesized from ilmenite by a two-stage calcination and acid leaching process, and porous TiO 2 /CdS composites were prepared by a hydrothermal method. The results of photocatalytic experiments indicate that the porous TiO 2 /CdS composite (PTC-2) with a Ti/Cd molar ratio of 1:1 exhibits the highest photocatalytic activity, with the degradation rate of methylene blue achieving a maximum value of 96.6% at 80 min. Moreover, the composite maintains a degradation efficiency of 88.5% after five cycles. The findings demonstrate that the TiO 2 /CdS heterojunction significantly enhances the photocatalyst's absorption of visible light while facilitating the effective separation and transfer of photogenerated electron–hole (e − /h + ) pairs. The porous architecture of the composite facilitates superior electron transport pathways and effectively mitigates e − /h + recombination. Furthermore, a mechanism for the photocatalytic degradation of organic dyes using porous TiO 2 /CdS composites is proposed, wherein photogenerated superoxide radicals ( · O 2 − ) and hydroxyl radicals ( · OH) serve as the primary reactive species. This study explores the cost-effective synthesis of TiO 2 /CdS heterojunctions and makes a significant contribution to the advancement and utilization of natural minerals for pollution degradation.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
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
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2016
·Vol. 92
·期 4
·515-522
·
IF 2.008
Yanmei Luo,Yiru Jia,Dexian Zhang,Xinjian Cheng
TiO 2 /PVA composite nanofiber mat was prepared via an electrospinning technology. SH-TiO 2 -SiO 2 hybrid particles and PVA solution were injected through a coaxial syringe, yielding a composite nanofiber mat. The as-prepared SH-TiO 2 -SiO 2 /PVA composite nanofiber mat was immersed in Cd 2+ cation solution and S 2− anion solution in turn. Thus, yellow TiO 2 @CdS/PVA composite nanofiber mats were prepared. By adjusting the number of times a mat was immersed in the Cd 2+ and S 2− solutions, different amounts of CdS particles attaching to the mats were obtained. Both SH-TiO 2 -SiO 2 /PVA and TiO 2 @CdS/PVA composite nanofiber mats were employed to catalyze the photodegradation of a model dye, methylene blue. The photodegradation performance could be greatly enhanced by the introduction of CdS particles anchoring onto TiO 2 particles. The photodegradation efficiency reached 99.2% within 180 min. Also, the nanofiber mat could be recycled and reused at least 10 times. The photodegradation efficiency of TiO 2 @CdS/PVA composite nanofiber mats remained 68.8% for 10 cycles.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2013
·
IF 3.548
Xiaofeng Cui,Guiyuan Jiang,Ming Zhu,Zhen Zhao,Luchao Du,Yuxiang Weng,Chunming Xu,Dekai Zhang,Quanlai Zhang,Yuechang Wei,Aijun Duan,Jian Liu,Jinsen Gao
Solar driven semiconductor photocatalytic water splitting to produce hydrogen is an extremely charming process by storing photon energy in chemical bonds. In the present study, composite semiconductor TiO 2 /CdS was structured into uniform and porous double-shelled hollow sphere with cocatalyst platinum selectively loaded onto the internal wall. The SEM, TEM , STEM , XRD , BET and EDS elemental distribution etc. were employed to evidence the formation of the targeted photocatalyst . It was demonstrated that the material has a high efficiency of visible-light-driven hydrogen evolution (296 μmol·h −1 /10 mg) with an apparent quantum efficiency (QE) of 14.5% at wavelength of 420 nm. Comparative experiment analysis and time-resolved infrared absorption study suggested that the high photocatalytic activity of the catalyst is attributed to the vectorial electron transfer (CdS → TiO 2 → Pt) and the spatial separation of reduction and oxidation active surfaces achieved by the special morphology.
研究领域:
材料科学
·
光催化
·
能源转换
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Lizhe Ma,Zhihong Zhang,Jieli Duan,Jin Li,Qingyuan Lin,Yinlong Jiang,Kefu Zhu,Zhiyong Fang,Bang Ji,Zhou Yang
Catalyst performance is traditionally evaluated under high light intensity, where variations in e - -h + pair recombination rates at different light intensities may limit the applicability of the selected catalyst to diverse light sources. Response surface methodology (RSM) was employed to compare catalyst performance under two optimization processes, using tetracycline degradation rate and photon flux as response variables. The m-TiO 2 @CdS catalyst was characterized by XRD, SEM, TEM, XPS, and UV-Vis-DRS, and its preparation process was optimized using RSM, with precursor ratio, hydrothermal time, and temperature as variables. The proposed optimization model for tetracycline degradation rate and photon flux exhibited a strong correlation between predicted and experimental results. The tetracycline degradation rates for the two optimized preparation processes were nearly identical, at 61.87 % and 61.18 %, respectively. A comparison of tetracycline degradation kinetics under different light conditions (light saturation and non-saturation) for the two optimized m-TiO 2 @CdS samples demonstrated that the photon flux-based optimization model offered greater adaptability across a wider range of light intensities. Additionally, the repeatability of m-TiO 2 @CdS prepared under the optimal conditions was assessed, and a plausible mechanism for its photocatalytic degradation of tetracycline was proposed.
研究领域:
环境科学
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材料科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 25
·2857-2864
·
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
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
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
·
传感技术
·
表面化学
·
理论物理
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Wenjing Shen,Dandan Xiang,Junnan Yang,Yanting Tang,Changhui Xin,Quanhui Guo,Xin Yu
In this work, beta zeolite supported Ti 3+ -TiO 2 /CdS heterojunction was prepared for photodegradation of tetracycline under visible-light irradiation, and zeolite served as a support for the high dispersions of the Ti 3+ -TiO 2 nanoparticles . The obtained zeolite/Ti 3+ -TiO 2 /CdS heterojunction showed a relatively high surface areas of approximately 63.2 m 2 g −1 , much higher than those of the prepared Ti 3+ -TiO 2 /CdS (27.1 m 2 g −1 ), Ti 3+ -TiO 2 (36.5 m 2 g −1 ), and CdS (31.1 m 2 g −1 ), strongly demonstrating the significant of zeolite for high dispersion of the Ti 3+ -TiO 2 /CdS composite. Besides, the experimental results also showed that the photocatalytic degradation efficiency could reach 78 % in 3 min for the zeolite/Ti 3+ -TiO 2 /CdS heterojunction, and the corresponding rate constant was as high as 0.788 min −1 , which was 26.90 times that of pristine Ti 3+ -TiO 2 , 2.24 times of pristine CdS , and 2.04 times of the Ti 3+ -TiO 2 /CdS composite, mainly because of the supporting effects of zeolite and the formation of Ti 3+ -TiO 2 /CdS heterostructure for highly enhanced charge separation. In addition, the trapping experiment revealed that the main reactive species involved in tetracycline degradation were attributed to the photo-generated holes and ⸱O 2 - species.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）