APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Qian Li,Jing Hu,Haiqiang Wang,Zhongbiao Wu
Limited light absorption and severe charge recombination have been widely acknowledged as the two main obstacles restricting the application of P25 in NO photocatalytic conversion. In this work, an advanced heterojunction photocatalyst of Bi/BiOI/black TiO 2 was synthesized via an in-situ solid-state chemical reduction method. The black TiO 2 extended the light absorption to the full spectral region. It constructed a direct Z-scheme heterojunction with BiOI nanosheets, not only promoting the charge separation, but also preserving the strong oxidation ability of photogenerated holes in black TiO 2 and strong reducing ability of photogenerated electrons in BiOI. Thus, more •O 2 − and •OH radical could form when Bi/BiOI/black TiO 2 was subjected to visible light irradiation. Besides, the introduced Bi metal nanoparticles could also enhance the light utilization and served as a cocatalyst to accept the electrons. Therefore, enhanced NO photocatalytic oxidation activity was obtained, with the optimal sample Bi/BiOI/black TiO 2 exhibiting a high NO conversion efficiency of ~70% and NO x removal of ~45%. This work may provide a refreshing perspective for the design of heterojunction photocatalysts for efficient NO photocatalytic purification and other photocatalytic applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Xi Wu,Xiangyu Wang,Yu Xie,Nanqi Ren,Jun Ma,Ping Ning
This research provides a innovatively designed mechanism of activating the passivation layer on Fe 0 surface as semiconductor to construct a Z-scheme heterojunction in-situ for high-efficiency environmental remediation. Aggregation and passivation of Fe 0 and poor visible-light absorption of TiO 2 were simultaneously improved by the facile synthesis of a recyclable Fe 0 @black-TiO 2 Z-scheme heterojunction without high-temperature hydrogen atmosphere. The results showed that tetracycline (TC) degradation efficiency with Fe 0 @black-TiO 2 was 1.23 and 2.63 times higher than that of pristine Fe 0 and black-TiO 2 , respectively. The superior degradation arose from strong reduction ability of highly dispersed Fe 0 and in-situ constructed Z-scheme heterojunctions. High dispersion of Fe 0 , construction of the heterojunction, enhanced photodegradability of Fe 0 @black-TiO 2 were systematically elucidated by multiple characterization techniques. Furthermore, photodegradation pathways of TC based on the role of •O 2 - and •OH were identified. Our results have provided the necessary inspiration and guidance for the development and application prospect of Fe 0 @black-TiO 2 in environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Kexin Lv,Mengmeng Hou,Yufang Kou,Hongyue Yu,Mengli Liu,Tiancong Zhao,Jiacheng Shen,Xirui Huang,Jie Zhang,Mohamed F. Mady,Ahmed A. Elzatahry,Xiaomin Li,Dongyuan Zhao
Thanks to their excellent photoelectric characteristics to generate cytotoxic reactive oxygen species (ROS) under the light-activation process, TiO2 nanomaterials have shown significant potential in photodynamic therapy (PDT) for solid tumors. Nevertheless, the limited penetration depth of TiO2-based photosensitizers and excitation sources (UV/visible light) for PDT remains a formidable challenge when confronted with complex tumor microenvironments (TMEs). Here, we present a H2O2-driven black TiO2 mesoporous nanomotor with near-infrared (NIR) light absorption capability and autonomous navigation ability, which effectively enhances solid tumor penetration in NIR light-triggered PDT. The nanomotor was rationally designed and fabricated based on the Janus mesoporous nanostructure, which consists of a NIR light-responsive black TiO2 nanosphere and an enzyme-modified periodic mesoporous organosilica (PMO) nanorod that wraps around the TiO2 nanosphere. The overexpressed H2O2 can drive the nanomotor in the TME under catalysis of catalase in the PMO domain. By precisely controlling the ratio of TiO2 and PMO compartments in the Janus nanostructure, TiO2&PMO nanomotors can achieve optimal self-propulsive directionality and velocity, enhancing cellular uptake and facilitating deep tumor penetration. Additionally, by the decomposition of endogenous H2O2 within solid tumors, these nanomotors can continuously supply oxygen to enable highly efficient ROS production under the NIR photocatalysis of black TiO2, leading to intensified PDT effects and effective tumor inhibition.
研究领域:
生物医学工程
·
纳米医学
·
肿瘤治疗
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Chunfeng Yuan,Yongli Shen,Chunyu Zhu,Pei Zhu,Fan Yang,Jinghai Liu,Changhua An
Solar-driven hydrogen production is an ideal way to fundamentally solve energy and environmental issues to some extent. TiO2 as a class of promising photocatalysts has attracted intensive attention. However, low light utilization and serious recombination of photo-induced charge carriers lead to a low efficiency. Herein, black TiO2 (B–TiO2) nanosheets have been first synthesized by H2/Ar plasma treatment, onto which Ru single atoms are anchored by dipping RuCl3 solution. X-ray absorption fine spectra reveal that the Ru–O coordination number is ∼5 from the scattering between the Ru center and O atoms of B–TiO2, demonstrating the strong interplay between Ru atoms with TiO2. Density functional theory (DFT) simulations and photoelectrochemical tests clarify that the introduction of Ru single-atoms produces impurity levels, which serves as charge-trapping sites, and facilitates the photo-generated electron separation and transportation. Furthermore, the Gibbs free-energy of the adsorbed H* over RuSAs/B–TiO2 is much closer to zero compared to that of pristine TiO2, thus considerably boosting the photocatalytic performance. The hydrogen evolution over RuSAs/B–TiO2 reaches 17.81 mmol/g/h with an apparent quantum efficiency (AQE) of 21.3% at 365 nm. It is expected that this facile strategy can be employed to fabricate other efficient photocatalysts for new energy production and environmental remediation.
研究领域:
材料科学
·
能源科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yan Chen,Huanshun Yin,Fei Li,Jie Zhou,Lingsong Wang,Jun Wang,Shiyun Ai
A kind of novel heterojunction structure with black TiO 2 and WS 2 was prepared with matched energy band and significantly improved visible-light-driven photoelectrochemical activity. Then, to further improve the photoelectrochemical activity of this heterojunction, solid-state electron donor of polydopamine was employed with satisfactory result. The band gap, potential of conduction band and valence band was investigated using Mott-Schottky curve, VB-XPS and UV–vis diffuser reflectance techniques. These materials were also characterized by SEM, TEM, XRD, IR, Roman spectra, and EPR image. The improved photoactivity was confirmed by monitoring and comparing the photocurrent response of black TiO 2 , WS 2 and Black TiO 2 /WS 2 heterojunction. To explore the applicability of this novel heterojunction structure, a kind of photoelectrochemical biosensor was constructed for histone acetyltransferase p300 detection using black TiO 2 and WS 2 as photoactive material and polydopamine as electron donor. Under optimized conditions, the photoelectrochemical biosensor shows wide linear range from 0.01 to 500 nM for histone acetyltransferase p300 detection. The detection limit is 0.0033 nM (S/N = 3). The sensor has good selectivity, stability and reproducibility. The inhibition tests show that aminoglycoside antibiotics significantly inhibits the activity of histone acetyltransferase and the IC 50 of typical tobramycin, streptomycin sulfate and kanamycin sulfate were 10.41, 13.31 and 15.42 μM, respectively.
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2019
·Vol. 25
·期 45
·10642-10649
·
IF 5.16
Jiantao Huang,Jijian Xu,Xiangli Che,Chong Huang
Graphical Clash of titanium oxide : A novel composite structure of TiO 2− x with conductive TiO layer is synthesized in one step by an unforeseen dismutation reaction and performs full-spectrum absorption. Black TiO 2− x attracts enormous attention due to its large solar absorption and improved conductivity. In this work, a novel structure of TiO 2− x with conductive TiO layer, performing full-spectrum absorption, was synthesized in one step by the unforeseen dismutation reaction of titanium sub-oxides (Ti n O 2 n −1 ) in ammonium halide atmosphere. For this new reaction, a possible mechanism of decomposition-etching-disproportionation-rehydrolysis process was proposed. The vital intermediate reactant TiCl 4 , which verifies the assumption, has been captured in the form of (NH 4 ) 2 TiCl 6 , especially where Ti 2 O 3 is the reactant. Furthermore, this work not only can nominate TiO as an alternative for noble metals or carbon materials in the aim to improve the electron conductivity and solar absorption of black TiO 2− x , which are important in electrochemistry and optoelectronics fields, but also can be a new route to synthesize special structures for other multivalent transition metals.
研究领域:
材料科学
·
化学工程
·
光电领域
✓ 已验证
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）