COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Xian-Yang Sun,Feng-Jun Zhang,Cui Kong
A novel porous g-C 3 N 4 /WO 3 photocatalyst was successfully obtained by adopting urea and WO 3 ⋅0.33H 2 O as precursor by a simple hydrothermal and calcination method. The structural characteristics, photoelectric properties , and hydrogen generation efficiency of g-C 3 N 4 /WO 3 were studied. The results shows that best photocatalytic hydrogen generation efficiency of the g-C3N 4 /WO 3 was 963 μmol −1 h −1 , it was about 3 times than pure g-C 3 N 4 . Hydrated tungsten oxide promotes the formation of porous structure after removing crystal water, and the increased pore volume and pore size provide more reactive activity sites, which contribute to increase the efficiency of hydrogen generation. The mechanism of photocatalytic hydrogen generation was proposed.
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JOURNAL OF SOLID STATE CHEMISTRY
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2020
·
IF 2.726
Danqi Li,Jing Sun,Tingting Shen,Hongchen Song,Jiuxin Liu,Chen Wang,Xikui Wang,Rusong Zhao
In most cases, different morphologies of the same composites correspond to different properties. In this paper, the TiO 2 /rGO heterostructure system with three morphologies was obtained by one-step hydrothermal method through regulating hydrothermal time. Compared with TiO 2 nanoparticle/reduced graphene oxide (TNP/rGO) and TiO 2 nanobelt/reduced graphene oxide (TNB/rGO), TiO 2 nanotube/reduced graphene oxide (TNT/rGO) showed higher photocatalytic activity (78.5%, 2 h) toward degrading Rhodamine B and 2, 4-Dichlorophenol under visible light. The mechanism of enhancing photocatalytic activities of the TiO 2 /rGO system was confirmed by free radicals trapping experiment, ESR , PL and photocurrent measurement. It is revealed that the hole (h + ) is the main reactive specie in TNT/rGO heterojunction and rapid transfer of photogenerated electrons is responsible for enhancing photocatalytic activity. This work not only emphasizes the important role of morphology in improving photocatalytic activity, but also provides a simple strategy to alter the morphology of TiO 2 .
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JOURNAL OF NANOPARTICLE RESEARCH
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2020
·Vol. 22
·期 4
·1-14
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IF 2.132
Cao Xinjiang,Guo Weiyun,Li Anhua,Du Juan,Du Lei,Zhang Guangjie,Liu Hui
Developing a high-efficient, low-cost visible-light-responsive photocatalyst is still a challenge in environmental remediation. Here, a three-dimensional (3D) porous architecture named reduced graphene oxide/CdS nanowire (RGO/CdS) aerogel was constructed by a facile two-step approach through coupling graphene with one-dimensional CdS nanowires (CdS NWs). A variety of characterization methods displayed that the resultant RGO/CdS aerogels were embedded with large amounts of CdS NWs with an average length and width of ∼ 2.9 μm and ∼ 60 nm, respectively, which would maximize the specific surface area that in turn markedly facilitate the transportation of photogenerated charge carriers and strong adsorption of organic pollutants. Moreover, the visible-light photocatalytic experiments demonstrated that the RGO/CdS aerogel exhibited a higher degradation rate (96.6%) for methylene blue (MB) degradation compared with that of bare CdS NWs or pure RGO xerogel. In this proposed study, a photocatalytic mechanism indicates that the enhanced photocatalytic activity of the 3D framework might contribute potentially to generate synergetic effect of CdS NWs into the space of graphene sheets.
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ACS Central Science
·
2020
·
IF 12.685
Shi-Bo Wang,Cheng Zhang,Jing-Jie Ye,Mei-Zhen Zou,Chuan-Jun Liu,Xian-Zheng Zhang
Photothermal therapy (PTT) is an effective treatment modality with high selectivity for tumor suppression. However, the inflammatory responses caused by PTT may lead to adverse reactions including tumor recurrence and therapeutic resistance, which are regarded as major problems for PTT. Here, a near-infrared (NIR) light-responsive nanoreactor (P@DW/BC) is fabricated to simultaneously realize tumor PTT and carbon monoxide (CO)-mediated anti-inflammatory therapy. Defective tungsten oxide (WO3) nanosheets (DW NSs) are decorated with bicarbonate (BC) via ferric ion-mediated coordination and then modified with polyethylene glycol (PEG) on the surface to fabricate PEG@DW/BC or P@DW/BC nanosheets. Upon 808 nm NIR laser irradiation, the DW content in P@DW/BC can serve as not only a photothermal agent to realize photothermal conversion but also a photocatalyst to convert carbon dioxide (CO2) to CO. In particular, the generated heat can also trigger the decomposition of BC to produce CO2 near the NSs, thus enhancing the photocatalytic CO generation. Benefiting from the efficient hyperthermia and CO generation under single NIR laser irradiation, P@DW/BC can realize effective thermal ablation of tumor and simultaneous inhibition of PTT-induced inflammation.
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高影响因子
LANGMUIR
·
2020
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IF 3.557
Hongchao Yan,Yuan Qiu,Jing Wang,Qian Jiang,Hong Wang,Yonggui Liao,Xiaolin Xie
Much attention has been paid to construct photoresponsive host–guest supramolecular gels; however, red-shifting the responsive wavelength remains a formidable challenge. Here, a wholly visible-light-responsive supramolecular gel was fabricated through the host–guest interaction between a β-cyclodextrin (β-CD) dimer and a tetra-ortho-methoxy-substituted azobenzene (mAzo) dimer (binary gelator) in DMSO/H2O (V/V = 8/2). The minimum gelation concentration of the low-molecular-weight binary gelator was 6 wt % measured via the tube inversion method. The substituted methoxy groups shifted the responsive wavelengths of trans-mAzo and cis-mAzo to the green and blue light regions, respectively. The host–guest interaction between mAzo and β-CD as the driving force for gelation was confirmed using the 1H-NMR and 2D 1H NOESY spectra. The supramolecular gel showed good self-supporting ability with a storage modulus higher than 104 Pa. The release of Rhodamine B loaded in the gel as a model drug could be controlled by green light irradiation. We envisioned the potential applications of the wholly visible-light-responsive supramolecular compounds ranging from biomedical materials to smart materials.
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Chemosensors
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2020
·Vol. 8
·期 1
·10
·
IF 3.108
Tian-Tian Wang,Kun Guo,Xue-Mei Hu,Jian Liang,Xing-De Li,Zhi-Feng Zhang,Jing Xie
In this work, a label-free colorimetric assay was developed for the determination of urine glucose using smartphone ambient-light sensor (ALS). Using horseradish peroxidase—hydrogen peroxide—3,3′,5,5′-tetramethylbenzidine (HRP-H2O2-TMB) colored system, quantitative H2O2was added to samples to-be-determined for deepest color. The presence of glucose oxidase in urine led to the formation of H2O2and the reduction of TMBred. As a result of this, the color of the urine faded and the solution changed from deep blue to light blue. We measured the illuminance of the transmitted light by a smartphone ambient light sensor, and thereby color changes were used to calculate the content of urine glucose. After method validation, this colorimetric assay was practically applied for the determination of urine samples from diabetic patients. Good linearity was obtained in the range of 0.039–10.000 mg/mL (R2= 0.998), and a limit of detection was 0.005 mg/mL. Our method was had high accuracy, sensitivity, simplicity, rapidity, and visualization, providing a new sensor to be potentially applicable for point-of-care detection of urine glucose.Keywords:urine glucose;smartphone;ambient light sensor;point-of-care detection
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Kaili Yao,Yi Liu,Huan Yang,Jingyou Yuan,Shaoyun Shan
In this study, a polyaniline-modified 3D-spongy SnS photocatalyst (PANI/SnS) has been prepared using an in-situ oxidative polymerization technique for the enhanced photocatalytic degradation of methyl orange. PANI/SnS reached to a rate constant of 4.040 × 10 −2 min -1 > 2 times of that pure SnS and maintained a good stability after four cycling runs for methyl orange degradation. The better photocatalytic activity and stability of PANI/SnS catalyst were ascribed to the π-conjugated structure characteristic of PANI and the interaction between PANI and SnS. On the one hand, induced π-conjugated electrons transferred from PANI to SnS could effectually inhibite the electrons and holes recombination. On the other hand, the presence of C–S and Sn-N bonds between PANI and SnS could protect the S and/or Sn element from direct exposure to the corrosive environment, then restraining photocorrosion behavior. This study implies that conductive conjugated polymer (PANI) modified tin sulfide will be a potential reusable and stable photocatalyst for methyl orange removal from waste-water by photocatalysis .
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JOURNAL OF CHEMICAL PHYSICS
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2020
·Vol. 152
·期 24
·
IF 2.991
Zhu Jingxian,Jiang Wenshuai,Wang Bin,Niu Lijuan,Dong Chenxi,Qu Dan,An Li,Wang Xiayan,Sun Zaicheng
Mixed phase TiO 2 (Degussa P25) exhibits superior photocatalytic performance and stability due to the formation of the hetero-phase junction between anatase and rutile. However, the large bandgap limits its visible light activity. CdS is a photocatalyst with a broad light absorption band up to 550 nm. Constructing a hetero-phase junction will greatly promote the photocatalytic activity of CdS. In this work, the one-step solvothermal method was used to synthesize CdS hetero-phase junction with both hexagonal wurtzite (WZ) and cubic zinc blende (ZB) phases. The ratio of WZ and ZB phases can be tuned by adjusting the solvent ratio and reaction time to construct type I junction and effectively separate the photogenerated electron–hole pair. Under visible-light illumination, the optimal photocatalytic activity of the prepared material reaches 7.96 mmol h −1 g −1 , and the quantum efficiency is 36.7% at 420 nm, which is three times higher than that of any single-phase sample (cubic or hexagonal phase) and maintains high photocatalytic stability as well. It is expected that this work will provide a feasible prospect for the practical application of high-efficiency homogeneous junction photocatalysts.
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Nanoscale
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2020
·Vol. 12
·期 29
·15791-15799
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IF 6.895
Hao-Hua Deng,Qiong-Qiong Zhuang,Kai-Yuan Huang,Paramasivam Balasubramanian,Zhen Lin,Hua-Ping Peng,Xing-Hua Xia,Wei Chen
As a new emerging candidate for solid-state phosphors, copper nanoclusters (CuNCs) have gained tremendous interest in the field of white light-emitting devices (WLEDs). However, their further applications are impeded by the low photoluminescence quantum yield (PLQY) and poor emission color tunability of CuNCs. This work demonstrates the synthesis of cyan and orange emitting CuNCs, and their combination as color conversion phosphors in WLEDs. The cyan and orange emitting CuNCs were prepared employing 2-mercapto-1-methylimidazole (MMI) and N-acetyl-L-cysteine (NAC), respectively, as stabilizing-cum-reducing agents. The dispersions of MMI-CuNCs and NAC-CuNCs are weakly emissive. However, after processing into powders, they both possess ultrahigh PLQYs (45.2% for MMI-CuNCs, and 64.6% for NAC-CuNCs) owing to the effect of aggregation-induced emission (AIE). All-CuNC based WLEDs are then designed and developed using powdered MMI-CuNC and NAC-CuNC samples on commercially available 365 nm GaN LED chips. They display acceptable white light characteristics with a Commission Internationale de l'Eclairage coordinate value and color rendering index of (0.26, 0.30) and 83, respectively. We believe that these cost-effective and eco-friendly CuNCs with interesting AIE properties will vigorously promote the development of high-quality WLEDs for commercial applications.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2020
·
IF 6.444
Yi Chen,Xing Zhao,Chen Luo,Yan Shao,Ming-Bo Yang,Bo Yin
Despite tremendous advances in the preparation of smart materials, it remains a great challenge to integrate shape memory and self-healing properties into one material system, which have received increasing interests because of their many potential applications. Herein, the PCL/TPU blends are prepared as shape memory matrix by simple solution blending. Then the polydopamine (PDA) nanospheres acted as photothermal fillers were incorporated into PCL/TPU blends which enables the system to exhibit excellent light-response shape memory effect with a shape recovery ratio of 100%. Besides, the nanocomposites also own good self-healing performance because of the microporous structure. The surface crack can be healed in 150 s under light irradiation, and the healing efficiency can reach 78.53%. Therefore, the fast light-response shape memory effect and rapidly self-healing property, along with the facile fabrication processes, make PCL/TPU/PDA nanocomposites ideal for a variety of applications, such as biomedical microdevices, artificial muscles and soft robotics.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2020
·
IF 3.306
Shuguang Li,Zhiyu Liu,Chunxiao Lu,Zhihui Qu,Congcong Piao,Jianhe Tang,Dawei Fang,Jun Wang
The use of co-catalysts can observably enhance photocatalytic hydrogen production activity. In this work, a novel visible-light driven photocatalyst, (MoSe 2 -RGO)/(Er 3+ :Y 3 Al 5 O 12 /ZnS)/RuO 2 nanocomposite, is prepared for the first time by loading Er 3+ :Y 3 Al 5 O 12 , MoSe 2 -RGO and RuO 2 on the surface of ZnS nanoparticles. Er 3+ :Y 3 Al 5 O 12 as an effective visible-to-ultraviolet up-conversion luminescence agent can provide the ultraviolet-light to activate wide band-gap ZnS. MoSe 2 -RGO and RuO 2 , acting as conduction band co-catalyst and valence band co-catalyst, respectively, can effectively separate the photo-generated carriers and supply more reactive sites. The activities of the photocatalysts were assessed via photocatalytic hydrogen production in Na 2 S and Na 2 SO 3 aqueous solution under 300 W xenon lamp irradiation. In addition, the visible-light irradiation time and used times of the prepared samples as influence factors on the photocatalytic hydrogen production were also investigated. It was easily found that the prepared (MoSe 2 -RGO)/(Er 3+ :Y 3 Al 5 O 12 /ZnS)/RuO 2 nanocomposite shows fairly high activity in photocatalytic hydrogen production, compared with single ZnS photocatalyst. It was mainly attributed to the excellent up-conversion luminescence property of Er 3+ :Y 3 Al 5 O 12 and the efficient separation of photo-generated electrons and holes caused by MoSe 2 -RGO and RuO 2 . This research may pave an effective way for photocatalytic hydrogen production utilizing solar light.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2020
·
IF 6.155
Sheng Guo,Zhixiong Yang,Huali Zhang,Wei Yang,Jun Li,Kun Zhou
A simple sol-gel approach is proposed herein to fabricate CaFe 2 O 4 for the degradation of various organic pollutants (rhodamine B (RhB), tetracycline hydrochloride, humic acid, and methylene orange) under LED light irradiation mediated by peroxymonosulfate (PMS). The results indicate that the calcination temperature can significantly influence the performance of CaFe 2 O 4 for PMS activation, and the CaFe 2 O 4 sample obtained at 800 °C (CaFe 2 O 4 -800) exhibits the best efficiency in degrading RhB, which is much higher than that of Fe 2 O 3 -800. This can be attributed to the efficient separation of photogenerated electrons (e − ) and holes (h + ) by PMS, which is validated by transient photocurrent response and photoluminescence measurements. Results from density functional theory calculations indicate that the valence band of CaFe 2 O 4 -800 exhibits a high concentration of carriers and weak localization of electrons, which are favorable for PMS activation. Radical scavenging results confirm that h + and O 2 • − are the dominant reactive species. Moreover, CaFe 2 O 4 -800 not only demonstrated a stable performance during eight cycling runs with negligible iron leaching but also exhibited excellent degradation efficiency under natural water and sunlight. Finally, the mechanism and pathway of RhB degradation by the CaFe 2 O 4 -800/PMS/LED system are also proposed. This work presents the enormous prospect of CaFe 2 O 4 as an environmentally benign photocatalyst for PMS activation.
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