Crystals
·
2021
·Vol. 11
·期 11
·1328
·
IF 2.589
Daini Wang,Wenxia Wu,Xiaojun Tan,Bernard A. Goodman,Shoulei Xu,Wen Deng
As a development on previous research on single crystals of Pr3+-doped yttria-stabilized zirconia (YSZ), we report here the preparation and optical properties of Yb/Pr co-doped YSZ single crystals with different Yb2O3concentrations. Results from X-ray diffraction (XRD) and Raman spectroscopy indicated that all of the crystal samples had a cubic phase structure, and transmission was ≥88% in the 550–780 nm range. Photoluminescence (PL) under excitation with a 980 nm laser showed upconversion emission, and several peaks were observed centered on 448 nm, 508 nm, 525 nm, 542 nm, 617 nm and 656 nm. The effects of excited state absorption (ESA), energy transfer upconversion (ETU), cross relaxation (CR), and cooperative energy transfer (CET) on the upconversion luminescence and energy transition mechanism in YSZ crystals were further studied. The fluorescence lifetime of the3P0→3H5transition at 542 nm reached 207 μs, which shows that the samples are of potential use for laser and fluorescence output.Keywords:optical floating zone method;yttria-stabilized zirconia (YSZ) single crystal;Pr/Yb co-doped;upconversion luminescence
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Jiamei Zhao,Qiangyi Deng,Ziyin Yang,Hongmei Zhang,Conglu Zhang
In this paper, a high-efficient visible light responsive g-C 3 N 4 /CaTiO 3 /CQDs Z-type heterojunction photocatalyst was successfully prepared by a two-step method for the photodegradation of organic pollutants in water. The combination of g-C 3 N 4 , CaTiO 3 and CQDs could produce synergistic effect, which facilitated the separation of carriers, thereby enhancing photocatalytic activity . The photocatalytic kinetic removal rate of g-C 3 N 4 /CaTiO 3 /CQDs for methylene blue could reach about 8 times of g-C 3 N 4 and 5.5 times higher than that of CaTiO 3 . The effects of co-existing ions, initial pH, water source, and humic acid on meloxicam degradation were examined. Repeatability experiments indicated that the composite had good reusability and stability with 81.1 % removal for meloxicam after four cycles. The main active substances of g-C 3 N 4 /CaTiO 3 /CQDs in free radical capture experiment was ⋅O 2 − . Possible degradation pathways of meloxicam were also analyzed. The results highlight the g-C 3 N 4 /CaTiO 3 /CQDs Z-type heterojunction is a desirable photocatalyst for removing organic pollutants in water.
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 14
·期 1
·74
·
IF 5.3
Xin Zhong,Meihuan Ji,Wenxin Wu,Caicai Lu,Wenping Liu,Fubin Jiang
In this work, the heterojunctions of CuInS2embedded in the g-C3N4materials (xCuInS2/g-C3N4, abbreviated as xCIS/GCN) was successfully prepared for peroxymonosulfate (PMS) activation under visible light. The catalysts are characterized by different techniques, such as XRD, FTIR, SEM, TEM, and UV-vis. The unique heterojunction composites can suppress the recombination of photogenerated pairs. The catalytic results showed that the 3CIS/GCN exhibited excellent catalytic levofloxacin (LVF) degradation efficiency, while more than 98.9% of LVF was removed in 60 min over a wide pH range. SO4•−, O2•−, OH•, and1O2were verified as the main reactive species for LVF degradation via the quenching experiments and electron paramagnetic resonance technology (EPR). The synergetic effect of xCIS/GCN, PMS, and visible light irradiation was discussed. The possible LVF degradation pathway was proposed through byproducts analysis (LC-MS). Moreover, the 3CIS/GCN/vis-PMS system has very low metal leaching. Owing to xCIS/GCN having good properties for PMS activation, it has potential applications for LVF or other hazardous pollutants degradation.Keywords:peroxymonosulfate;visible-light-assisted PMS activation;antibiotics
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2023
·
IF 17.6
Chaoliang Zhang,Yangkun Xu,Hongjie Bai,Dengfeng Li,Lai Wei,Chuanliang Feng,Yanhao Huang,Zhengshang Wang,Xiaoyan Li,Xudong Cui,Chenguo Hu,Feng Wang
Modifying photocatalysts for effective NO removal has profound implications for environmental protection. In this work, a novel g-C 3 N 4 containing non-intrinsic oxygen vacancies (V O -CN) is synthesized via a facile oxygen pre-doping followed by elimination. Compared to pristine g-C 3 N 4 , V O -CN exhibits remarkably enhanced visible-light photocatalytic activity , increasing NO removal by 54.3%, with high NO 3 - selectivity. This photocatalytic enhancement is attributed to the non-intrinsic oxygen vacancies introduced in Vo-CN. As comprehensively revealed by experimental characterizations coupled with density functional theory (DFT) calculations. The results show that the midgap state generated in the V O -CN electronic band structure accelerates photogenerated electron-hole separation. Additionally, the unique surface structure of V O -CN provides favorable channels for carrier migration while enhancing O 2 and NO adsorption. Consequently, the markedly improved generation of reactive oxygen species by Vo-CN promotes highly efficient NO removal. This work provides novel insights into designing high-performance g-C 3 N 4 -based photocatalysts for eliminating hazardous NO pollutants.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Lu Tan,Zhenxi Yuan,Weirui Chen,Ziyi Lin,Yiming Tang,Laisheng Li,Jing Wang
In this work, a series of BiOCl x Br 1-x (BCB) solid solutions are facilely designed for visible-light-driven photocatalytic ozonation (PCO) degradation of florfenicol (FF) in water environments, which could add to the library of efficient, cost-effective and robust nanocatalysts for water purification . BCB solid solutions in the structure of 2D nanosheets are achieved involving the etching of BiOBr “micro-flowers” with HCl at different concentrations, allowing a removal ratio of FF up to 97.3 % within 1 h, superior to bare BiOBr and bare BiOCl. A strengthened synergistic effect between photocatalysis and ozonation is substantiated, where the separation of photo-induced charge transfer is accelerated, the band gap is tuned and the utilization efficiency of ozone is enhanced. This facilitates the production of reactive oxygen species identified as •OH, •O 2 – , and 1 O 2 that will attack the FF molecule for degradation based on three pathways.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 23
·4501-4508
·
IF 7.571
Xi Xiao,Bingzhu Zheng,Qiang Zheng,Zijie Lu,Dong Cen,Xiujun Cai,Xiang Li,Renren Deng
Peroxynitrite anion (ONOO−), a product derived from reaction between reactive oxygen species (ROS) and nitric oxide (NO), is considered to be a more toxic reactive species than most ROS for cancer photodynamic therapy (PDT). To promote the PDT effect, a viable method is to develop rational strategies for efficient ONOO− generation at targeted tumor sites. Herein, a heterostructure nanocomposite containing ZnO-coated lanthanide nanoparticles (LnNPs) is reported for ONOO−-based PDT. In this nanocomposite, Nd3+-doped LnNPs are employed to realize efficient NIR-light-triggered ROS generation by activating the triplet state of chlorin-e6 (Ce6) photosensitizers via a direct lanthanide-to-triplet sensitization mechanism. Meanwhile, ZnO in the composite catalyzes the decomposition of S-nitrosoglutathione (GSNO) to generate NO in the tumor microenvironment. The coupled system allows the combination of photo-induced ROS and NO to produce ONOO−, leading to drastically promoted cancer cell apoptosis and tumor growth inhibition. This study establishes a new apoptosis-inducing PDT agent, which is potentially active in drug resistant malignancies.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 25
·2300118
·
IF 29.4
Hongfei Li,Xiaoqi Liu,Donglei Zhou,Biao Dong,Lin Xu,Xue Bai,Hongwei Song
Erbium ions (Er 3+ , 1.54 µm) electric pumped light sources with excellent optical properties and a simple fabrication process are urgently desired to satisfy the development of silicon-based integration photonics. The previous Er-based electroluminescence devices are mainly based on Er-complexes or Er-doped oxide compounds, which usually suffer from low external quantum efficiency(EQE)or high applied voltage etc. In this work, a novel type of Er 3+ /Yb 3+ co-doped lead-halide perovskite films (Er 3+ /Yb 3+ :CsPbCl 3 ) with the maximum photoluminescence quantum yield of 30.12% are prepared by a simple two-step solution-coating method and the corresponding light emitting diodes (Er-PeLEDs) are fabricated, which demonstrate an almost pure 1.54-µm emission and a peak EQE up to 0.366% at a low applied voltage of 1.4 V. Strong negative thermal quenching effect may help Er-PeLEDs suppress Joule heating quenching. These excellent LED properties benefit mainly from the outstanding regulatory performance of acetate to perovskite films, the excellent semiconductor behavior and strong ionic property of the perovskite, and the involvement of Yb 3+ ions, which can directly and efficiently transfer the exciton energy to Er 3+ through a quantum cutting process. Overall, the realization of 1.54-µm Er-PeLEDs offers new opportunities for silicon-based integrated light sources.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Beizhao Chen,Xun Liu,Bei Liu,Qi Han,Li Li,Li Wang,Yufei Shu,Linlin Zang,Wenlei Zhu,Zhongying Wang
Carbon nitride (CN) is an emerging 2D non-metal semiconductor material that could be used in photocatalysis and advanced oxidation processes (AOPs) for pollutants degradation . The radical-induced degradation by CN in photocatalysis or photo-assisted AOPs was widely reported in previous studies. Nevertheless, how the non-radical degradation by CN materials could be achieved under irradiation is neither well understood nor controlled. In this work, crystalline carbon nitride (CCN) was synthesized via a facile molten-salt method, and used to activate peroxymonosulfate (PMS) under visible light (>420 nm) to selectively and efficiently degrade tetracycline (TC). Compared to the traditional polymeric carbon nitride (PCN), CCN was found to be a superior PMS activator with the assistance of visible light, which was ascribed to the increased crystallinity of CN tri-s-triazine units and the increased number of catalytic sites, thereby optimizing the photoelectric properties. The activation performance could be further improved by copper loading, with TC degradation rate nearly six times more than that of PCN. EPR trapping and quenching tests showed that singlet oxygen ( 1 O 2 ) was the dominant reactive oxygen species in the CCN/PMS/visible light system, attributing to the increased graphitic N sites and formation of electron-deficient C in C–N bonding between neighboring tri-s-triazine units upon crystallinity elevation in CCN. In contrast to the conventional radical-based photocatalysis and AOP processes, the visible light-assisted non-radical AOP degradation was highlighted for the selectivity and the remarkable resistance to the impacts of background inorganic anions or natural organic matter (up to 10 mg/L) in the actual water matrix. This work revealed the 1 O 2 generation mechanism by CN-based materials under the joint assistance of visible light illumination and crystallinity elevation, and its excellent removal performance demonstrates the great potential of CCN-based materials in the practical wastewater treatment .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2023
·
IF 2.8
Chen Feng,Jiao Peixin,Zhao Caixian
Single-atom photocatalysts exhibit outstanding performance in energy and environmental photocatalysis, due to their exceptional capabilities in enhancing light-harvesting, charge transfer dynamics, and surface reactions. The key to preparing single-atom photocatalysts lies in developing an appropriate metal-support that can prevent aggregation or sintering during synthetic procedures. In this work, a Co(II)-urea complexe in-situ formed in melamine was employed as single-atom Co precursors to synthesize an efficient single-atom Co decorated P doped g-C 3 N 4 (Co/PCN) photocatalyst. The high-angle annular dark field transmission electron microscope (HAADF-TEM) results indicated abundant Co single atoms were immobilized in the g-C 3 N 4 matrix. Under visible-light irradiation, the as-prepared photocatalysts show remarkably enhanced photocatalytic performance. Especially, loaded with 1.5 wt% single atoms Co, the optimized Co/PCN exhibits H 2 evolution of 892.5 µmol g −1 h −1 , which is 33 times higher than that of PCN, and even twice as much as that of Pt-loaded g-C 3 N 4 (Pt/PCN). The enhanced photocatalytic activity is ascribed to the synergistic effect between single-atom Co and P doping, which facilitates efficient light harvesting, charge separation, and migration. It is believed that this study paves a new avenue for developing high-efficiency single-atom photocatalysts. Graphical Abstract
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Ting Zhu,Bo Wu,Jing Xie,Hongran Yang,Weibin Zhang,Yanyan Sun
Hierarchical structured p–n heterojunctions comprising cuprous oxide nanowire cores (Cu2O NW) and CoFe-layered double hydroxide (CoFe LDH) nanosheet shells on copper foam (CF) substrates were constructed by in situ wet–chemical reactions with subsequent electrodeposition. The synergistic effect of the superior light-harvesting ability of Cu2O and the built-in electric field generated by the Cu2O/CoFe LDH p–n heterojunction is verified to facilitate the efficient separation of photogenerated electrons and holes by promoting the rapid transfer of photogenerated charge carriers. Benefiting from the advantages above, the optimal CF@Cu2O NW/LDH-3 exhibits light-enhanced catalysis toward the hydrogen evolution reaction (maximum enhancement of 14.4%) and oxygen evolution reaction (maximum enhancement of 7.4%) for water splitting. Moreover, the alkaline electrolytic cell based on the optimal CF@Cu2O NW/LDH-3 requires an operating potential of only 1.62 V to drive a high current density of 100 mA cm–2 under illumination. Meanwhile, a current density retention of up to 91.62% can be reserved after a stability test for 24 h. This work provides ideas for the design of transition metal-based catalytic materials for photodriven electrochemical water splitting.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Jinquan Liu,Liangliang Xu,Qixiao Ji,Longfei Chang,Ying Hu,Qingyu Peng,Xiaodong He
Phototropism and self-oscillation are both self-regulating intelligent movements of biological organisms. However, realizing these intelligent movements in one same artificial actuation system remains a great challenge. Here, by introducing dynamic light-mechanical interaction, a MXene-based actuator is designed and fabricated that can generate unique self-adaptive light-driven actuation from the equilibrium state of phototropic deformation to self-oscillation. The actuator can autonomously track the incident light, showing a sunflower-like phototropism. Moreover, by simply installing a load on the actuator to induce self-shadowing-enabled negative feedback loop, it can carry the load to continuously oscillate under constant light irradiation, with a frequency of 6.5 Hz, an amplitude of 2.6 mm, and a load-to-weight ratio value of 4.7. The oscillation frequency and amplitude can be further adjusted by the incident light power, actuator length, and weight of the installed load. This oscillator can serve as an intelligent light-powered motor platform. By installing diverse accessories with different functions on the oscillator, it can realize various applications, including information transmission, light-induced power generation, bionic motions, and multi-mode intelligent switches. These results provide a simple and versatile strategy for designing a self-adaptive oscillator driven by light and show the prospect of the oscillator in light-powered engines and smart machinery systems.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2023
·
IF 2.8
Zhendong Wang,Zhexin Zhu,Gangqiang Wang,Xiaoji Ma,Wangyang Lu
Iron (II) phthalocyanine (FePc) is loaded on the surface of the tourmaline (TM) by the reflow method to obtain FePc/TM. This research effectively prevents the π-π stacking of FePc, increased the effective utilization rate of PMS activation under solar light, and further improved the catalytic performance of the catalytic system. The catalytic oxidation efficiency of FePc/TM on carbamazepine (CBZ) and sulfadiazine (SD) can reach 99% under solar light for 15 and 5 min, the total organic carbon (TOC) removal rate can reach 58% and 69% under solar light for 120 min. After 6 cycles, the CBZ removal rate remained above 95%. In addition, the FePc/TM catalytic system has an excellent removal rate for other pharmaceuticals. The results of spin-trapped electron paramagnetic resonance and classical quenching experiments show that FePc/TM can effectively activate PMS to generate active species under solar light, including superoxide radical (•O2−), singlet oxygen (1O2), hydroxyl radicals(•OH), and sulphate radicals (SO4•−). The intermediates of CBZ were identified by Ultra-high performance liquid chromatography and high resolution mass spectrometry, and the degradation pathway was proposed. As the reaction progresses, all CBZ and intermediates are reduced and converted into small acids, or mineralized to H2O, CO2. This work provides an alternative method for the design of efficient activation of PMS activation catalysts under solar light to eliminate residual pharmaceuticals in actual water bodies.
✓ 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）