Catalysts
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2020
·Vol. 10
·期 1
·69
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IF 3.52
Zhen Cao,Tingting Zhang,Pin Ren,Ding Cao,Yanjun Lin,Liren Wang,Bing Zhang,Xu Xiang
We demonstrate that using neoprene as a binder during the fabrication of TiO2-coated fabrics enhances the rates of photodegradation of dyes by the fabrics. The neoprene binder simultaneously modifies the surface of the TiO2particles with Cl and dopes the TiO2with Cl, without requiring high temperatures or other harsh laboratory treatments. The adsorption of chlorine on the surface and doping of the lattice with chlorine were confirmed by X-ray photoelectron spectroscopy. The chloride ions adsorbed onto the TiO2surface introduces a negative surface charge that enhances electrostatic adsorption of cationic dyes, and greatly improves the self-sensitizing degradation performance of the dyes. Chloride ions replace lattice oxygen atoms in TiO2, inducing lattice oxygen vacancies, that reduce the apparent band gap of the TiO2particles, enhancing its absorption of visible light, and further increasing the photocatalytic activity of the composite-coated fabric. The degradation rates of RhB and MB over 50 min were 95.2% and 96.0%, respectively. The degradation rate for MO reached 95.4% after 180 min. We also show that •OH and •O2−are active agents in the dye-degradation mechanism. Moreover, the photocatalytic performance of the composite-coated fabric was unchanged after eight cycles of photocatalytic degradation of RhB, demonstrating that the photocatalyst-coated fabrics was highly recyclable.Keywords:TiO2-coated fabrics;self-sensitizing degradation;neoprene;chlorine doping;oxygen vacancies
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
FUEL
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2025
·
IF 7.5
Cuncun Qian,Ming-Jia Li,Ruilong Wang
Solar-powered photocatalytic CO 2 reduction offers great potential for carbon fixation. Conventional wide-bandgap semiconductors absorb little visible light. Dye sensitization improves absorption but reduces photoelectron transfer efficiency, limiting photocatalytic performance. This work reports a self-sensitized anatase brown titanium dioxide (B-TiO 2 ) catalyst developed through an optimized two-step method. Comprehensive experimental and computational analyses reveal that B-TiO 2 extends its spectral absorption edge to 601.94 nm, over 43.69 % compared to P25, significantly enhancing visible light absorbance. The surface of B-TiO 2 characterized by oxygen vacancies, Ti 3+ species, and lattice defects, which are crucial for its markedly improved photocatalytic activity. Under irradiation from a 300 W Xe-lamp, the self-sensitized B-TiO 2 catalyst achieves an impressive total charge-transferred electron number of 570.84 μmol·g −1 ·h −1 and a CO 2 conversion rate of 142.05 μmol·g −1 ·h −1 . Furthermore, the photocatalytic mechanism was investigated in detail. This innovative self-sensitized catalyst offers a promising strategy for developing high-efficiency photocatalysts, potentially advancing the field of photocatalytic CO 2 reduction.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Mina Yang,Haijing Zhang,Fei Chang,Xuefeng Hu
Chlorinated organic compounds are ubiquitously detected in saline waters. The photochlorination of organic compounds is one possible source, and chlorine radicals originating from other photosensitive substances have been reported to be responsible for organic compounds chlorination in previous reports. In this study, benzo[ a ]pyrene (BaP) chlorination in 10% acetonitrile/NaCl aqueous solution was initiated by self-sensitization of BaP, while chlorine radicals were not involved in the reaction. After 45 min of photoreaction in four seawater samples, chlorinated product (6-ClBaP) accounted for 10–17% of the fraction of transformed BaP, which was higher than that previously reported. The influences of Cl − , pH, humic acid , electron donors, and particulate matter on the formation of chlorobenzo[ a ]pyrene were systematically investigated. A self-sensitized photochlorination reaction mechanism was proposed as follow: photoexited BaP was activated to singlet state and then transformed to triplet state through inter-system crossing. Then the excited triplet state and oxygen formed [ 3 BaP*- 3 O 2 ] or [BaP- 1 O 2 ] complex, which further reacted with Cl − to produce 6-ClBaP.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2019
·
IF 3.973
Lingli Zhang,Chengguang Wu,Shansong Mu,Wei Xue,Dong Ma
To enhance the chemotherapy effect to MDA-MB-231, a glutathione (GSH)-sensitive amphiphilic hyperbranched poly (amide-amine) (mPEG-PLGA-HPAA) was synthesized, and the anti-cancer drug, paclitaxel (PTX) was then encapsulated into the mPEG-PLGA-HPAA micelles. The mPEG-PLGA-HPAA containing a large number of disulfide bonds could degrade and then consume the GSH intracellularly, which was expected to enhances the sensitivity of MDA-MB-231 cells to PTX. It was found that the mPEG-PLGA-HPAA/PTX nanoparticles could respond to the GSH and showed a GSH-controlled PTX release. Simultaneously, the mPEG-PLGA-HPAA/PTX nanoparticles significantly enhanced the efficacy of PTX by inhibiting MDA-MB-231 cells proliferation and inducing cells apoptosis, performing the self-sensitization effect of chemotherapy. Moreover, the drug carrier of mPEG-PLGA-HPAA exhibited excellent biocompatibility in vitro and in vivo . These results indicated that the self-sensitized drug carrier is a promising route to maximize the therapeutic effect and minimize the side effects of chemotherapy drugs used currently in clinical.
研究领域:
药学
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肿瘤学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
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2025
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IF 5.6
Yuan Li,Yong Xia,Xinxin Li,Xin Zhou,Dongmei Li,Wei Zhang,Zhiqiang Guo
Dye sensitization has emerged as a promising strategy to enhance the visible-light photocatalytic performance of TiO 2 . However, conventional dye-sensitized photocatalytic systems face significant challenges, such as limited light absorption efficiency and secondary pollution caused by dye desorption and degradation. Herein, pure TiO 2 hollow nanospheres are prepared, and their size is regulated to excite Mie resonance, thereby enhancing the self-sensitized photocatalytic degradation of Rhodamine B (RhB) under visible light without the need for external sensitizers. By optimizing the diameter of the TiO 2 hollow nanospheres to approximately 370 nm (D370), we achieve a strong overlap between the Mie resonance wavelength and the absorption band of RhB. Under visible-light irradiation, D370 exhibits exceptional photocatalytic performance, achieving 94.3% degradation of RhB within 60 min and a reaction rate constant of 46.91×10 -3 min -1 , which significantly outperforms conventional TiO 2 nanoparticles. Using finite element method (FEM) simulations and multipole decomposition method, we reveal that the enhanced performance is driven by size-dependent Mie resonances, predominantly magnetic quadrupole resonances. These resonances localize and amplify the incident light field on and around the spherical shells, leading to a more than 4-fold enhancement in the electric field intensity and a substantial increase in RhB absorption. This work demonstrates the remarkable potential of pure TiO 2 materials for visible-light-induced photocatalytic degradation, achieving high efficiency without additional modification. Furthermore, it highlights the critical role of Mie resonance, particularly magnetic multipole contributions, in enhancing light utilization efficiency. These findings not only advance our understanding of light-matter interactions in photocatalytic systems but also provide a novel framework for designing high-performance photocatalysts, paving the way for broader applications in solar energy conversion and environmental remediation.
研究领域:
材料科学
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环境科学
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光学
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
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2019
·Vol. 21
·期 21
·5886-5895
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IF 9.405
Junjian Xie,Lun Pan,Genkuo Nie,Jiawei Xie,Yakun Liu,Chi Ma,Xiangwen Zhang,Ji-Jun Zou
The photoinduced conversion of biomass-derived chemicals to high value chemicals and advanced fuels is of great significance but still challenging. Herein, a green and efficient self-sensitized [2 + 2] cycloaddition process is developed to convert biomass-derived β-pinene and isophorone to spirocyclic molecules, which cannot be achieved by thermal catalytic conversion. The photoreaction can take place with isophorone as the self-sensitizer, with high selectivity and a yield of up to 91.1%. A triplet sensitization mechanism is disclosed by a combination of triplet quenching, phosphorescence quenching, Stern–Volmer kinetic analysis, DFT calculations and photochemical kinetic studies. When combined with hydrodeoxygenation, spiro-fuel is obtained with an overall yield of 85.0% showing a high density of 0.911 g mL−1 which is 16.8% higher than that of conventional aviation kerosene (ca. 0.78 g mL−1), along with excellent cryogenic properties. Notably the self-sensitized cycloaddition strategy can be extended to a wide range of biomass derived α,β-unsaturated ketones and alkenes. Thus, this work provides a promising ring-increasing route to upgrade low-density bio-derived feedstocks to high-density hydrocarbons.
研究领域:
化学工程
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能源科学
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绿色化学
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产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2023
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IF 4.3
Shijie Wei,Hongcen Zheng,Jia-Jia Zhao,Shouyun Yu,Bingdang Wu,Guoyang Zhang,Shujuan Zhang
Self-sensitized degradation is a typical fate of azo dyes in aquatic systems but its kinetics is far too slow to meet the requirement for a thorough decolorization. Small diketones were found being able to enhance the degradation of dyes under UV irradiation and the introduction of an electron-denoting group at the α -position of the simplest β -diketone (acetylacetone, AA) had a further enhancement effect on the degradation. However, it is unclear whether such enhancement effects exist in the solar-irradiated systems. To clarify this question, the effects of three AA derivatives were investigated with Acid Orange 7 (AO7) as a representative azo dye. Compared with the AA derivatives with a methyl or an ethyl group at the central carbon (AA-CH 3 and AA-CH 2 CH 3 ), 3,5-diacetylheptane-2,6-dione (AA-CH 2 -AA, which is a condensed combination of AA and AA-CH 3 ) showed a >2-fold stronger enhancement effect. The nonstoichiometric enhancement effect of AA-CH 2 -AA on AO7 photodegradation disclosed a novel pathway for dye degradation: AA-CH 2 -AA could enhance the degradation of AO7 by reacting with the photo-sensitized 1 O 2 , whereas AA led to an inhibitory effect on the self-sensitized degradation of AO7 by quenching the excited state of the azo dye. These results demonstrate that small diketones could be designed to regulate the photodegradation of azo dyes in multiple pathways.
研究领域:
环境化学
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光化学
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水处理
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Lei Wang,Shaoyun Guo,Xianlong Zhang
γ-Irradiation is a kind of high-energy ionizing ray, which has widespread applications in material, food, and medical industries as well as in the environment. Since this irradiation is invisible, quantitatively monitoring its exposure doses is crucial to irradiated targets. As a type of dosimeter, radiochromic dosimeters can detect γ-irradiation by color changing, and its strategy to realize the radiochromic behavior basically relies on active radicals from radiolysis of an external environmental medium. However, the primary problem of this external environment-mediated sensitization strategy is that it complicates the components of dosimeters. Herein, we present a novel type of self-sensitizing radiochromic poly(urethane-urea) elastomers (PUUEs), where disulfide bonds, serving as radiation-responsive and sensitizing units, are introduced. This is the first attempt to utilize radicals generated from radiolysis of weak bonds in a solid polymer matrix to sensitize color change of dye-doped radiochromic dosimeters. Moreover, it is intriguing that the simultaneously introduced aryl hydrazone bond endows dosimeters with excellent color retention and maintains the Δa* value of 72.9% even after 1 month on the basis of the as-irradiated specimen. Besides, the metathesis of disulfide bonds not only endows dosimeters with better self-healing capability, but also accelerates the postcuring behavior and hydrogen bond reconfiguration, resulting in improved mechanical performance.
研究领域:
材料科学
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辐射生物学
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医学工程
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产品关联
DOI
PubMed
高影响因子
Acta Biomaterialia
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2018
·
IF 6.383
Qiao Tang,Xin Ma,Yi Zhang,Xiang Cai,Wei Xue,Dong Ma
Polymeric prodrugs are of immense interest as anticancer drug-delivery system owing to their superior drug stability during circulation and satisfactory drug loading capacity. However, they are usually less effective than free drugs due to imperfect degradable characteristics or active sites blockage. A polymeric prodrug (HPAA-MTX) with chemotherapeutic self-sensibilization effect consisting of glutathione (GSH)-triggered hyperbranched poly(amido amine) (HPAA) and methotrexate (MTX) was designed and synthesized in this work. This prodrug not only showed better inhibition effect on the tumor cells proliferation compared with free MTX , but also displayed selective sensibilization to tumor cells rather than normal cells. Meanwhile, HPAA-MTX was also explored as a MMP-9 shRNA plasmid delivery vector due to their rich amino group of HPAA, accompanying with MTX for simultaneous inhibiting tumor cells proliferation and migration. As expected, HPAA-MTX possessed excellent gene delivery capacity with significant down-regulation expression of MMP-9 protein and further inhibition of MCF-7 cells migration. Benefiting from the self-sensibilization effect and MTX/MMP-9 co-delivery strategy, this HPAA-MTX/MMP-9 co-delivery system exhibited significantly improved therapeutic efficacy to breast cancer in a combined manner which was confirmed through in vitro and in vivo assays. The strategy established in this study provided a facile “all-in-one” platform to integrate the drug/gene co-delivery strategy and self-sensibilization effect into one single nanocomposite for potential cancer treatment. Statement of significance A cationic polymeric prodrug with chemotherapeutic self-sensibilization effect was designed and showed better inhibition effect on tumor cells proliferation compared with its free drug, as well displayed the selective sensibilization effect to tumor cells rather than normal cells. Moreover, the prodrug could also deliver MMP-9 shRNA plasmid for a combined therapy. As expected, the prodrug possessed excellent gene delivery capacity with significant down-regulation expression of MMP-9 protein and further inhibition of MCF-7 cells migration. Benefiting from the self-sensibilization effect and the drug/gene co-delivery strategy, this prodrug exhibited significantly improved therapeutic efficacy to breast cancer in a combined manner.
研究领域:
肿瘤学
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药剂学
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分子生物学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2024
·
IF 6.3
Lina Xiao,Qiuping Zhang,Xinzhi Wang,Honglei Shuai,Hui Lu,Xiaoyan Li,Xiaojian Yang,Hao Zhang
Recently, there has been significant interest in the investigation of high-efficiency photocatalysts utilizing metal–organic frameworks (MOFs). The combination of metal nanoparticles (MNPs) into MOFs to form composites, such as platinum NPs (PtNPs)/MOFs, has become a prevalent and widely employed method in the field of photocatalysis. In this investigation, a simple method was employed to distribute PtNPs uniformly across the surface of a self-sensitized palladium porphyrin MOF (PCN-222(Pd)). When subjected to irradiation by visible light, the hybrid material 3%Pt/PCN-222(Pd) demonstrated a notably effective rate of 3932 μmol g -1 h - 1 photocatalytic H 2 generation from the water, which is 2.2 times greater than a single PCN-222(Pd). This improvement may be related to the coordination of polyvinylpyrrolidone (PVP) between C=O and Zr 4+ , which enhances the interaction of PtNPs with PCN-222(Pd) nanorods. Consequently, the long-life electrons from Pd-metalized tetrakis(4-carboxyphenyl)porphyrin (PdTCPP) photosensitizers rapidly shift towards the electron capture site of PtNPs, significantly reducing the occurrence of recombination between photogenerated electron-hole pairs. The utilization of the synergistic effect of Pd-porphyrin photosensitizers and PtNPs co-catalyst in this technique efficiently enhances electron transport between Pd-porphyrin and PtNPs units, hence promoting the rate of H 2 evolution.
研究领域:
材料科学
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光催化
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纳米技术
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可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Chenguang Li,Yanlei Zhang,Shiqi Yin,Qin Wang,Yuanyuan Li,Qiang Liu,Liuqingqing Liu,Xianxiang Luo,Lingyun Chen,Hao Zheng,Fengmin Li
p -Phenylenediamines (PPDs), an important type of rubber antioxidants, have received little study on their environmental fate , particularly for their vital photodegradation process in water environment. Accordingly, N -(1,3-dimethylbutyl)- N′ -phenyl-1,4-phenylenediamine (6PPD), as a representative of PPDs, was investigated experimentally and theoretically for its photodegradation in water. Rapid photodegradation occurred when 6PPD was exposed to illumination especially UV region irradiation. Under acidic conditions, the photodegradation of 6PPD accelerated mainly due to the increased absorption of long wavelength irradiation by ionized 6PPD. Nine photodegradation products (e.g., 6PPD - quinone (6PPDQ)) of 6PPD were identified by an ultra-performance liquid chromatography QTOF mass spectrometry . Molar yields of photoproducts such as 6PPDQ, aniline, 4-aminodiphenylamine, and 4-hydroxydiphenylamine were 0.03 ± 0.00, 0.10 ± 0.01, 0.03 ± 0.02, and 0.08 ± 0.01, respectively. Mechanisms involved in 6PPD photodegradation include photoexcitation , direct photolysis, self-sensitized photodegradation, and 1 O 2 oxidation , as demonstrated by electron paramagnetic resonance (EPR) analysis, scavenging experiments, and the time-dependent density functional theory (TD-DFT). Notably, the toxicity of the reaction solution formed during the photodegradation of 6PPD was increased by the formation of highly toxic products (e.g., 6PPDQ). This study provides the first explanation for photodegradation mechanisms of 6PPD and confirms the pathway of 6PPDQ produced by the photoreaction in water environment.
研究领域:
环境科学
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化学
·
毒理学
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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）