POLYHEDRON
·
2017
·
IF 1.926
Ya-Nan Ren,Wei Xu,Lin-Xia Zhou,Yue-Qing Zheng
In this paper, two new uranyl complexes (H 2 -bpp)[(UO 2 )( p -nba) 3 ] 2 1 and (H 2 -bipy)[(UO 2 ) 4 ( μ 3 –O) 2 ( p -nba) 6 ] 2 were synthesized by hydrothermal method base on the reaction of UO 2 Ac 2 ·2H 2 O as the metal sources, p -nitrobenzoic acid (H p -nba), 4,4′-bipyridine (bipy) and 1,3-di(4-pyridyl)-propane (bpp) as the ligands in an aqueous system. Complex 1 exhibits two crystallographically unique uranyl cation of 8-fold coordinated. Complex 2 presents a μ 3 -oxido bridged tetranuclear uranyl structural unit of edge-sharing polyhedral connection mode. These complexes were characterized by elemental analyses, IR spectra, thermogravimetric analyses (TGA), UV−Vis spectra and powder X-ray diffraction (XRD) patterns. The photoluminescence properties were investigated for the two complexes. 1 and 2 exhibit good photocatalytic activities for degradation of tetracycline hydrochloride (TC) under visible light irradiation. Moreover, it is verified that the kinetics of degradation rate was well described by the pseudo-first-order kinetics.
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Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 48
·12848-12856
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IF 5.256
Tao Ji,Qian Liu,Rujia Zou,Yongfang Zhang,Lili Wang,Liwen Sang,Meiyong Liao,Junqing Hu
A simple hydrothermal process involving thermal diffusion has been developed to synthesize almost vertical doped titanium dioxide (TiO2) nanorod arrays on a silicon (Si) surface. The enhanced ultraviolet-visible (UV-vis) light photodetectors with a TiO2/Si heterojunction were fabricated using band engineering, by doping indium (In) or nitrogen (N) in TiO2 nanorod arrays. The photodiodes showed high quantum efficiencies of 200–400% under visible light illumination (e.g., 565 nm), and ∼16% with UV light (365 nm). Additionally, the N-doped TiO2/Si devices, with a unilateral linearly graded junction, had greater rectification characteristics, lower dark current, better quantum efficiency and response to UV detection, and the In-doped TiO2/Si heterojunction had a better multiplication factor for weak visible light detection, with a decreased electronic barrier and increased carrier concentration. These excellent results mean that doped TiO2/Si heterojunctions will be useful for new UV-vis light detection enhanced photodiodes which do not require expensive auxiliary equipment, thus making them easy to use in applications involving portable and wearable equipment.
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CATALYSIS LETTERS
·
2017
·Vol. 148
·期 1
·23-29
·
IF 2.799
Li Jinlin,Guan Weisheng,Yan Xu,Wu Ziyang,Shi Weidong
Abstract In this paper, LaFeO 3 nanoparticles were used as a visible light photocatalyst for efficient removal of 2,4-dichlorophenoxyacetic acid (2,4-D) with the assist of ozone. The pseudo-first-order kinetic rate constants of degrading 2,4-D removal in 60-PO/Vis in 1 h was 5.72 times as great as the sum of that when using LFO/O 2 /Vis and 60-Oz/Vis at the best concentration of ozone (60 mL/min). This improvement was attributed to the efficient synergistic effect between photocatalysis and ozonation triggered by LaFeO 3 . In PO/Vis, ozone facilitates the photo-generated electrons trapping and improves separation efficiency of photo-generated charges, which enhanced the yield of hydroxyl radical, so as to the degradation efficiency of organic pollutants. In addition, the effects of ozone concentrations on the photocatalytic ozonation processes were also studied. Moreover, we demonstrated the high stability and reusability of LaFeO 3 photocatalyst in photocatalytic ozonation process by circle experiment. Graphical Abstract Schematic illustration of the reaction mechanism of enhanced photocatalytic ozonation of 2,4-D by LaFeO 3 under visible light.
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RSC Advances
·
2017
·Vol. 7
·期 80
·50546-50554
·
IF 3.108
Rong Li,Chencen Sun,Jia Liu,Qiang Zhen
Magnetically recoverable sulfur-doped CoFe2O4 nanopowders were used as photocatalyst for degradation of oxytetracycline (OTC) under visible light in aqueous solution. S doped CoFe2O4 nanopowders synthesized by a simple calcining process were characterized by XRD, TEM, VSM, FT-IR, UV-vis DRS and XPS. The results showed that introducing of S element in CoFe2O4 crystal structure narrowed its band gap and increased visible light absorption. 0.3 S-CoFe2O4 exhibited the highest magnetic property and photocatalytic activity. The maximum photocatalytic conversion ratio of OTC reached 90.4% at pH = 8.5 after 5 h irradiation. During photocatalytic process, seven intermediate products were detected, and based on that a detailed degradation path way of OTC was proposed.
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WATER RESEARCH
·
2017
·
IF 6.942
Xiao-Tong Lv,Xue Zhang,Ye Du,Qian-Yuan Wu,Yun Lu,Hong-Ying Hu
Chlorinated reclaimed water is widely used for landscaping and recreational purposes, resulting in human exposure to toxic disinfection byproducts . Although the quality of chlorinated reclaimed water might be affected by sunlight during storage, the effects of solar light irradiation on the toxicity remain unknown. This study investigated the changes in cytotoxicity and total organic halogen (TOX) of chlorinated reclaimed water exposed to solar light. Irradiation with solar light for 12 h was found to significantly reduce the cytotoxicity of chlorinated reclaimed water by about 75%, with ultraviolet light being responsible for the majority of this reduction. Chlorine residual in reclaimed water tended to increase the cytotoxicity, and the synergy between solar light and free chlorine could not enhance the reduction of cytotoxicity. Adding hydroxyl radical scavengers revealed that the contribution of hydroxyl radical to cytotoxicity reduction was limited. Solar light irradiation concurrently reduced TOX. The low molecular weight (<1 kDa) fraction was the major contributor of cytotoxicity and TOX in chlorinated reclaimed water. Detoxification of the low molecular weight fraction by light irradiation was mainly a result of TOX dehalogenation, while detoxification of the high molecular weight (>1 kDa) fraction was probably caused by photoconversion from high toxic TOX to low toxic TOX.
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高影响因子
JOURNAL OF CATALYSIS
·
2017
·
IF 6.844
Yan Cao,Zipeng Xing,Mengqiao Hu,Zhenzi Li,Xiaoyan Wu,Tianyu Zhao,Ziyuan Xiu,Shilin Yang,Wei Zhou
Mesoporous black N-TiO 2−x hollow spheres are successfully fabricated through a facile evaporation-induced self-assembly (EISA) process, coupled with an etching procedure and an in-situ solid-state chemical reduction strategy. The resultant black N-TiO 2−x hollow spheres with high crystallinity possess a narrow band gap of ∼2.37 eV, a large specific surface area of ∼128 m 2 g −1 , and a well defined hollow sphere structure, which exhibit excellent visible-light-driven photocatalytic performance for degradation of phenol , reduction of Cr(IV), and hydrogen production . The photocatalytic reaction apparent rate constants (k) of the black N-TiO 2−x for phenol degradation and Cr(IV) reduction are ∼5 and 6 times higher than that of pristine TiO 2 , and hydrogen production rate for N-TiO 2−x is ∼160 μmol h −1 , which is ∼7 folds higher than that of pristine one. The excellent photocatalytic and photoreduction property can be attributed to the synergy effect of N and Ti 3+ codoping narrowing the band gap, the high specific surface area offering more surface active sites, and the mesoporous hollow structure favoring light harvesting and refraction.
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JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2017
·Vol. 56
·期 2
·229-236
·
IF 2.952
Qian Yang,Xianhong Zhang,Wenchao Ma,Yuhong Ma,Dong Chen,Li Wang,Changwen Zhao,Wantai Yang
The benzaldehyde derivatives, such as 2,4-dimethoxy benzaldehyde (PC1) and p -anisaldehyde (PC2), were successfully used as photoredox catalysts (PCs) in combination with typical RAFT agent 4-cyano-4-(phenylcarbonothioylthio)pentanoic acid (CTP) for the controlled photoinduced electron transfer RAFT polymerization (PET-RAFT) of methyl methacrylate (MMA) and benzyl methacrylate (BnMA) at room temperature. The kinetics of the polymerizations showed first order with respect to monomer conversions. Besides, the average number molecular weights ( M n ) of the produced polymers increased linearly with the monomer conversions and kept relatively narrow polydispersity (PDI = M w /M n ). For example, the M n of PMMA increased from about 3400 to 17,300 g mol −1 with the increasing in monomer conversion from 11% to 85%, and the PDI maintained around 1.36. The living features of polymerizations with the PC1 and PC2 as catalysts have also been further supported by chain extension and synthesis of PMMA- b -PBnMA diblock copolymer. As a result, the simplicity and efficiency of benzaldehyde derivatives catalyzed PET-RAFT polymerization have been demonstrated under mild conditions. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018 , 56 , 229–236
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iScience
·
2024
·
IF 4.6
Yi Xiao,Kai Feng,Graham Dawson,Valeri P. Tolstoy,Xingda An,Chaoran Li,Le He
Photothermal conversion represents one crucial approach for solar energy harvesting and its exploitation as a sustainable alternative to fossil fuels; however, an efficient, cost-effective, and generalized approach to enhance the photothermal conversion processes is still missing. Herein, we develop a feasible and efficient photothermal conversion strategy that achieves simultaneous light and heat management using supported metal clusters and WSe 2 interlayer toward enhanced CO 2 hydrogenation photothermal catalysis. The interlayer can simultaneously reduce heat loss in the catalytic layer and improve light absorption, leading to an 8-fold higher CO 2 conversion rate than the controls. The optical and thermal performance of WSe 2 interlayered catalysts on different substrates was quantified using Raman spectroscopy. This work demonstrates a feasible and generalized approach for effective light and heat management in solar harvesting. It also provides important design guidelines for efficient photothermal converters that facilitate the remediation of the energy and environmental crises faced by humans.
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PubMed
高影响因子
POLYMER
·
2024
·
IF 4.1
Al-Hassan S. Mahdy,Ibrahim M. Ammar,Shanmeng Lin,Kui Tan,Qi Xing,Jin Geng
Herein, we present a strategy for the autonomous regulation of glycopolymer brush construction and cleavage on glass substrates using surface-initiated photoinduced electron/energy transfer-reversible addition-fragmentation chain transfer (SI-PET-RAFT) polymerization. This process involves treating the chain transfer agent with a photocleavable moiety and linking it to glass substrates using 3-Aminopropyl triethoxysilane (APTES). Polymerization initiates at 510 nm with ZnTPP as a photocatalyst, and the glycopolymer brushes can be detached with 305 nm light. This allows GPC and NMR characterization, demonstrating controlled polymer structures with Đ <1.2. Glycopolymers formed on the surface, including d -glucose and d -mannose based polymers, enhance NCM460 cell adhesion compared to non-glycopolymer surfaces, enabling precise cell adhesion and detachment. This suggests potential applications in tissue engineering.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Rubina Jabeen,Muhammad Ali Tajwar,Changyan Cao,Yutong Liu,Shidi Zhang,Nasir Ali,Li Qi
Metal–organic frameworks (MOFs) are favorable hosting materials for fixing enzymes to construct enzyme@MOF composites and to expand the applications of biocatalysts. However, the rigid structure of MOFs without tunable hollow voids and a confinement effect often limits their catalytic activities. Taking advantage of the smart soft polymers to overcome the limitation, herein, a protection protocol to encapsulate the enzyme in zeolitic imidazolate framework-8 (ZIF-8) was developed using a glutathione-sensitive liposome (L) as a soft template. Glucose oxidase (GOx) and horseradish peroxidase (HRP) were first anchored on a light- and thermoresponsive porous poly(styrene-maleic anhydride-N,N-dimethylaminoethyl methacrylate-spiropyran) membrane (PSMDSP) to produce PSMDSP@GOx-HRP, which could provide a confinement effect by switching the UV irradiation or varying the temperature. Afterward, embedding PSMDSP@GOx-HRP in L and encapsulating PSMDSP@GOx-HRP@L into hollow ZIF-8 (HZIF-8) to form PSMDSP@GOx-HRP@HZIF-8 composites were performed, which proceeded during the crystallization of the framework following the removal of L by adding glutathione. Impressively, the biocatalytic activity of the composites was 4.45-fold higher than that of the free enzyme under UV irradiation at 47 °C, which could benefit from the confinement effect of PSMDSP and the conformational freedom of the enzyme in HZIF-8. The proposed composites contributed to the protection of the enzyme against harsh conditions and exhibited superior stability. Furthermore, a colorimetric assay based on the composites for the detection of serum glucose was established with a linearity range of 0.05–5.0 mM, and the calculated LOD value was 0.001 mM in a cascade reaction system. This work provides a universal design idea and a versatile technique to immobilize enzymes on soft polymer membranes that can be encapsulated in porous rigid MOF-hosts. It also holds potential for the development of smart polymer@enzyme@HMOFs biocatalysts with a tunable confinement effect and high catalytic performance.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Ting-Ting Li,Meng-Meng Xie,Hong-Yang Wang,Jun-Sheng Wang,Jia-Horng Lin,Ching-Wen Lou
It is a challenge to effectively degrade phenanthrene (PHE) pollutants, which are widely present in aquatic environments, in order to reduce harm to humans and ecosystems. In this study, an S-scheme TiO 2 /g-C 3 N 4 photocatalytic system is constructed using 0D TiO 2 nanospheres and 2D g-C 3 N 4 nanosheets for the removal of PHE from water under sunlight irradiation. The effects of irradiation time, quality ratio of TiO 2 to g-C 3 N 4 , and cycle time on the performance of the TiO 2 /CN photocatalyst are investigated. The experimental results show that the ratio of TiO 2 to g-C 3 N 4 significantly affects the photocatalytic activity of the photocatalyst. Under the optimal ratio of TiO 2 to g-C 3 N 4 (50 % TiO 2 /CN), the apparent reaction rate constant for phenanthrene reached 0.00796 min −1 , which is 11.5 times higher than that of pure TiO 2 (0.00069 min −1 ). The tests of optical performance and photoelectrochemical properties further confirmed that the construction of the TiO 2 /g-C 3 N 4 S-type photocatalyst successfully enhanced the spatial separation efficiency of photogenerated carriers and ensured a continuous supply of energy during the redox reaction process. Converting highly toxic phenanthrene into a non-toxic green degradation product provides an practical strategy for the safe treatment of PHE in aqueous environments through the use of visible-light-driven heterojunction photocatalysts. Additionally, the data collected on phenanthrene degradation in this study will provide valuable references for developing degradation methods for other PAHs, such as naphthalene, anthracene, and pyrene.
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ACS Nano
·
2024
·
IF 15.8
Shuting Yang,Bing Qi,Mingzi Sun,Wenjing Dai,Ziyun Miao,Wei Zheng,Bolong Huang,Jie Wang
Persistent luminescence describes the phenomenon whereby luminescence remains after the stoppage of excitation. Recently, upconversion persistent luminescence (UCPL) phosphors that can be directly charged by near-infrared (NIR) light have gained considerable attention due to their promising applications ranging from photonics to biomedicine. However, current lanthanide-based UCPL phosphors show small absorption cross sections and low upconversion charging efficiency. The development of UCPL phosphors faces challenges due to the lack of flexible upconversion charging pathways and poor design flexibility. Herein, we discovered a lattice defect-mediated broadband photon upconversion process and the accompanying NIR-to-NIR UCPL in Cr-doped zinc gallate nanoparticles. The zinc gallate nanoparticles can be directly activated by broadband NIR light in the 700–1000 nm range to produce persistent luminescence at about 700 nm, which is also readily enhanced by rationally tailoring the lattice defects in the phosphors. This proposed UCPL phosphor achieved a signal-to-background ratio of over 200 in bioimaging by efficiently avoiding interference from autofluorescence and light scattering. Our work reported a lattice defect-mediated photon upconversion phenomenon, which significantly expands the horizons for the flexible design of UCPL phosphors toward broad applications ranging from bioimaging to photocatalysis.
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