Journal of Physical Chemistry C
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2020
·
IF 4.189
Siqi Sun,Min Lu,Jie Guo,William W. Yu,Zhifeng Shi,Guang Sun,Yu Zhang
Improved device performance of perovskite light-emitting diodes (LEDs) is demonstrated through the synergistic effect of the optimized CsPbI3 nanocrystals (NCs) as the emissive layer (EML) and ZnO/C60 bilayer as electron transport layers (ETLs). The optical characteristics of the CsPbI3 NCs were optimized by strictly controlling the feeding ratio of Cs:Pb:I to 1:1:3 in the synthesis processes of NCs, which leads to enhanced photoluminescence quantum yields (PL QY) from 65% to 92%. Additionally, the introduction of C60 not only optimized the energy level structure of the device, leading to more balanced charge injection and transport, but also smoothed the surface of the ZnO film and perovskite NCs. Consequently, a peak external quantum efficiency (EQE) of 10.7% and maximum luminance of 1377 cd m–2 were achieved.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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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.
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Catalysis Science & Technology
·
2020
·Vol. 10
·期 24
·8230-8239
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IF 5.721
Haiqin Lv,Yanyan Duan,Xin Zhou,Guimei Liu,Xin Wang,Yuanhao Wang,Mingzhe Yuan,Qingguo Meng,Chuanyi Wang
The abuse of tetracycline antibiotics (TCs) has created great threats to both human health and the ecosystem. Therefore, developing efficient technologies to remediate these contaminants is of significant and practical interest. In this work, a ternary plasmonic Ag/AgCl@In2O3 nanocomposite was synthesized by growing AgCl on the surface of one-dimensional In2O3 nanorods, followed by the in situ photoreduction of Ag from AgCl on AgCl@In2O3. The as-synthesized Ag/AgCl@In2O3 nanocomposite exhibits excellent performance for the photocatalytic degradation of tetracycline (TTC) with a degradation rate constant of 0.166 min−1, which is much better than that of pristine In2O3, Ag@In2O3, AgCl@In2O3, Ag/AgCl, and In2O3 + Ag/AgCl (the mechanical mixture of In2O3 and Ag/AgCl) samples. Five photocatalytic cycling tests demonstrate that Ag/AgCl@In2O3 possesses outstanding stability. In addition, Ag/AgCl@In2O3 also exhibits excellent photo-activity for the degradation of other types of tetracycline antibiotics, e.g. chlortetracycline (CTC) and oxytetracycline (OTC). Further trapping experiments prove that h+ and ˙O2− are responsible for the photocatalytic reactions. The enhancement in the photoactivity of the Ag/AgCl@In2O3 system is largely due to the surface plasmon resonance effect (SPR) provided by the Ag nanoparticles, which inject electrons into AgCl and/or In2O3, and the efficient separation of photoinduced carriers is possible by transferring electrons to the conduction band of In2O3. This work provides a new type of photocatalyst towards the effective treatment of tetracycline antibiotics in aqueous systems.
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BIOMATERIALS
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2020
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IF 10.317
Guannan Zhang,Yongqiang Yang,Jing Shi,Xiaohong Yao,Weiyi Chen,Xiaochun Wei,Xiangyu Zhang,Paul K. Chu
Light-triggered therapy is a prospective method to combat implant-associated infection but near-infrared I (NIR-I) light has insufficient penetrating ability in tissues and local hyperthermia induced by the photothermal treatment may destroy surrounding healthy tissues. Herein, a near-infrared II (NIR-II) phototherapy system composed of upconversion elements doped titanium dioxide nanorods (TiO 2 NRs)/curcumin (Cur)/hyaluronic acid (HA)/bone morphogenetic protein-2 (BMP-2) is designed for biomedical titanium and demonstrated to overcome the above hurdles simultaneously. Incorporation of F, Yb, and Ho not only improves the photocatalytic ability, but also renders the implants with the upconversion capability, so that the NRs can generate enough reactive oxygen species (ROS) when irradiated by the NIR-II laser . Furthermore, the combined actions of quorum sensing inhibitors, ROS, and physical puncture by NRs eliminate Staphylococcus aureus biofilms on titanium rapidly at a mild temperature of 45 °C by only requiring irradiation with the 1060 nm laser for only 15 min in vitro and in vivo . The presence of Cur mitigates the immune response and BMP-2 improves osteogenic differentiation , thus accelerating new bone formation. This low-temperature NIR-II light-triggered antibacterial platform has large potential in combating deep-tissue infection in clinical applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Wenya Xu,Wen Wang,Simou Chen,Rui Zhang,Yuxin Wang,Qi Zhang,Lihui Yuwen,Wen Jing Yang,Lianhui Wang
The fabrication of flexible electronic sensors with self-healing capability is of great importance for the applications in wearable devices and skin-like electronics. Herein, a molybdenum disulfide (MoS 2 ) nanosheets-based hydrogel (Gel-PEG-MoS 2 , GPM hydrogel), with near infrared (NIR) light-induced self-healing property, was first reported as a flexible sensor. Only a small amount of MoS 2 nanosheets (0.04 wt‰) could impart the hydrogel with fast self-healing property under NIR irradiation in 90 s. The healing efficiencies increased with the increasing of MoS 2 loadings. Moreover, the GPM hydrogel exhibited both contact and noncontact sensing properties based on its deformation-dependent and light-sensitive conductivity, showing potential application as mechanical sensor and light-activated switches. By employing the versatile MoS 2 nanosheets, the hydrogel exhibited both fast self-healing ability and mechanical/light sensing capability. Therefore, the MoS 2 -based hydrogel provides a two-pronged approach for construction of self-healing flexible electronics.
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APL Materials
·
2020
·Vol. 8
·期 7
·
IF 3.819
Jiang Jintian,Wang Daoyuan,Wu Mingfang,Peng Ping,Li Fang-Fang,Liu Faqian,Jing Renwei,Ma Xuedan,Chao Yan,Xiao Zhili,Jiang Qinglong
Cs 4 PbBr 6 crystals have been synthesized by an ultrasonication-assisted trace amount polar solvent method. The prepared green Cs 4 PbBr 6 material was found to have high photoluminescence (PL) brightness and 10 ns PL lifetime. The prepared green light emitting device can achieve the maximum brightness of 3.8 × 10 9 cd/m 2 , which is nearly 100 times higher than a wick. The white light emitting device based on Cs 4 PbBr 6 crystals has better performance than commercial products, which can cover 32.3% of the color gamut and achieves 107.3% coverage for International Commission on Illumination (CIE)1931 and 84.8% coverage for CIE1976.
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WATER RESEARCH
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2020
·
IF 9.13
Shan Chen,Mingzhe Yuan,Wenbo Feng,Wan Liu,Wei Zhang,Houtao Xu,Xiaoyan Zheng,Genxiang Shen,Chunxia Guo,Liqing Wang
To improve the efficiency of antibiotic degradation, the photosynergistic performance of bismuth vanadate (BiVO 4 ) with a microalga , Dictyosphaerium sp., was demonstrated under visible-light irradiation for the first time. Sulfamethazine (SM2) was selected as a representative sulfanilamide antibiotic, and the photocatalytic degradation mechanism of SM2 was evaluated in media via the BiVO 4 –algae system. The hydrothermally synthesized sample was characterized using X-ray powder diffraction, X-ray photoelectron spectroscopy, ultraviolet–visible diffuse reflectance spectroscopy, transmission electron microscopy , Brunauer–Emmett–Teller surface area, and Fourier transform infrared spectroscopy techniques. The results demonstrated that the prepared photocatalyst corresponded to phase-pure monoclinic scheelite BiVO 4 . The synthesized BiVO 4 showed superior photocatalytic properties under irradiation with visible light, and more than 80% of photocatalytic degradation efficiency was obtained by the BiVO 4 –algae system. Based on quenching experiments, the photocatalytic degradation of SM2 in the BiVO 4 –algae system was primarily accomplished via the generation of triplet state dissolved organic matter , and hydroxyl radicals played a small role in the degradation process. The direct oxidation of holes made no contribution to the degradation. Metabolomics data showed that a total of 91 metabolites were significantly changed between the two comparison groups (algae–SM2 group vs algae group; algae–BiVO 4 –SM2 group vs algae–BiVO 4 group). The glycometabolism pathways were increased and the tricarboxylic acid cycle was activated when BiVO 4 was present. The study provides a distinctive approach to remove antibiotics using visible light in the aqueous environment.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2020
·Vol. 34
·期 11
·e5932
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IF 3.14
Yanming Jia,Junwen Wang,Kan Zhang,Chuanmin Ding
A highly shape-selective and relatively long-lifetime HZSM-5-based catalyst (Zn-2P/HZSM-5) was prepared by chemical modification with both ZnSiF 6 ·6H 2 O and H 3 PO 4 solution. The phosphoric acid modification could effectively modulate the Brønsted acid strength of the HZSM-5 catalyst, which promotes the oligomerization, alkylation, cyclization, and hydrogen transfer reactions. The introduction of Zn-Lewis acid sites significantly improved the dehydroaromatization of higher olefins. All of these were very beneficial for the generation of BTX (i.e. b enzene, t oluene, and x ylene) hydrocarbons in aromatization of methanol. The coke amount and the average rate of coke formation decreased over the Zn-2P/HZSM-5 catalysts, which may largely be ascribed to its lower strong acid sites and lower outer surface acidity. The catalytic performance of methanol aromatization showed that the Zn-2P/HZSM-5 catalyst exhibited the highest BTX selectivity of about 46.76% and the longest catalytic lifetime of about 498 h at T = 400 °C, P = 0.1 MPa, and weight hourly space velocity = 0.7 h −1 .
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INTERNATIONAL JOURNAL OF PHOTOENERGY
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2020
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IF 1.88
Jing Yan,Xiaojuan Li,Bo Jin,Min Zeng,Rufang Peng
A series of TiO2, TiO2/Pd, and TiO2/PdO hollow sphere photocatalysts was successfully prepared via a combination of hydrothermal, sol-immobilization, and calcination methods. The structure and optical properties of the as-prepared samples were characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, Brunauer-Emmett-Telleranalysis, Barrett-Joyner-Halenda measurement, and UV-Vis diffuse reflectance spectroscopy. The photocatalysis efficiencies of all samples were evaluated through the photocatalytic degradation of rhodamine B under visible light irradiation. Results indicated that TiO2/PdO demonstrated a higher photocatalytic activity (the photocatalytic degradation efficiency could reach up to 100% within 40 min) than the other samples and could maintain a stable photocatalytic degradation efficiency for at least four cycles. Finally, after using different scavengers, superoxide and hydroxyl radicals were identified as the primary active species for the effectiveness of the TiO2/PdO photocatalyst.
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Soft Matter
·
2020
·Vol. 16
·期 26
·6082-6090
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IF 3.14
Pengzhao Xu,Shifang Duan,Zuyao Xiao,Zhou Yang,Wei Wang
The emerging field of active matter, and its subset active colloid, is in great need of good model systems consisting of moving entities that are uniform and highly tunable. In this article, we address this challenge by introducing core–shell SiO2–TiO2 microspheres, prepared by chemically coating a thin layer of TiO2 on an inert core, that are highly monodisperse in size (polydispersity 4.1%) and regular in shape (circularity 0.93). Compared with similar samples prepared by the classic sol–gel method, Janus TiO2–Pt active colloids prepared with core–shell TiO2 spheres move faster and boast a much clearer Janus interface. Moreover, a unique feature of these core–shell TiO2 microspheres is their great tunability in the colloid size, shell thickness, and even the type of the core particle. These advantages are highlighted in two examples, one demonstrating a TiO2–Pt active colloid with a magnetic core that enables magnetic manipulation, and the other demonstrating the collective expansion and contraction of a uniform cluster of core–shell TiO2 colloids under UV light illumination. We believe that TiO2 microspheres produced by this core–shell technique compare favorably with many other types of active colloids being employed as model systems, and thus open up many research possibilities.
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WATER ENVIRONMENT RESEARCH
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2020
·Vol. 92
·期 12
·2049-2059
·
IF 1.369
Mengyi Wu,Yulin Tang,Qianhong Liu,Zhenjiao Tan,Mu Wang,Bin Xu,Shengji Xia,Shun Mao,Naiyun Gao
In this study, UV-LED was employed as a novel light source to investigate the degradation of a representative antibiotic compound, chloramphenicol (CAP), in the absence or presence of H 2 O 2 . The UV-LED irradiation showed a higher capability for degradation of CAP than conventional UV-Hg vapor lamps. Effects of the initial CAP concentration, UV wavelength, and light intensity on the degradation of CAP by UV-LED were evaluated. Introduction of H 2 O 2 evidently enhanced the degradation efficiency of CAP due to the production of reactive hydroxyl radicals. Results showed that the UV-LED/H 2 O 2 removed CAP by up to 95% within 60 min at pH 5.0, which was twice as that achieved by the UV-LED alone. The degradation products were identified to propose plausible degradation pathways. Moreover, the formation potentials of typical carbonaceous disinfection by-products (C-DBPs) and nitrogenous disinfection by-products (N-DBPs) were assessed for the CAP polluted water treated by the UV-LED alone and UV-LED/H 2 O 2 processes. Results indicate unintended formation of certain DBPs, thereby highlighting the importance of health risk assessments before practical application. This study opens a new avenue for developing environment-friendly and high-performance UV-LED photocatalytic reactors for abatement of CAP pollution in water. Practitioner points UV-LED bore higher capability to degrade CAP than low-pressure Hg lamp. The optimal performance to degrade CAP can be achieved at the UV wavelength of 280 nm. The degradation efficiency under UV-LED/H 2 O 2 process was double of that under UV-LED process. TCM, DCAN, and TCNM formation were higher under the existence of UV-LED radiation. The addition of H 2 O 2 had greater influence on the formation of DCAcAm than the introduction of UV-LED.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
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IF 3.232
Jin Yang,Yan Cao,Naidong Zhang
A method was developed that used hydroxylamine hydrochloride as a probe in a superoxide anion radical-generating visible light system for determining superoxide anion radicals. An Azure I solution with hydroxylamine hydrochloride was illuminated, after which a ferric iron solution was added to the sample solution and the remaining hydroxylamine hydrochloride in solution reduced from ferric to ferrous ions. Then, 1,10-phenanthroline solution was added and spectrophotometrically measured at 510 nm, which indirectly indicated the hydroxylamine hydrochloride content. The yields of superoxide anion radicals were indirectly expressed by the hydroxylamine hydrochloride decrement. Under optimal experimental conditions, the linear range was 0.0–1.5 × 10 −5 M and the limit of detection and limit of quantification were obtained to be 8.37 × 10 −7 and 2.54 × 10 −6 M with an R 2 of 0.9993. The method was simple and feasible and could be used for the stable measurement of superoxide anion radicals produced by photosensitizers that produce color under acidic conditions in visible light systems.
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