Nanoscale
·
2011
·Vol. 4
·期 2
·455-460
·
IF 4.109
Bo Jiang,Peng Zhang,Ya Zhang,Ling Wu,Hexing Li,Dieqing Zhang,Guisheng Li
A new hierarchical visible-light-driven photocatalyst Bi2TiO4F2 was synthesized by a solvothermal method for the first time. The photocatalyst was characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), N2 adsorption–desorption (BET), UV-vis diffuse reflectance spectroscopy (DRS). Such hierarchical Bi2TiO4F2 microspheres assembled by nanosheets were fabricated via an Ostwald ripening process in the absence of soft templates (surfactants). The as-prepared samples’ bimodal pore-size distributions in the mesoporous region consisted of smaller intra-aggregated pores with peak pore diameter of ca. 4.6 nm and larger inter-aggregated pores with peak pore diameter of ca. 17.0 nm. The band gap of the obtained Bi2TiO4F2 was estimated to be about 2.71–3.06 eV for various solvothermal treatment time. Owing to the hierarchical structure with bimodal pores, low band gaps and high crystallinity, the Bi2TiO4F2 microspheres exhibited high photocatalytic performance and durability for the degradation of rhodamine B (RhB) under visible light (> 420 nm). It was proved that the photo-generated holes and ˙OH radicals played an essential role for the oxidation of RhB.
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TEXTILE RESEARCH JOURNAL
·
2023
·
IF 2.3
Changcheng Zhang,Xiaoqiang Ma,Ting Pan,Yan Zhang,Huiyu Jiang,Jinbo Yao
Monodisperse poly (methyl acrylate-meth-acyloxy-ethyl trimethylammonium chloride) cationic nanospheres were synthesized by soap-free emulsion polymerization, and were subsequently combined with gardenia to prepare dye/nanospheres. The influence of the concentration of gardenia yellow, rate of vortexing, temperature and pH of mixing on the adsorption capacity and stability of microspheres were thoroughly investigated, and the prepared gardenia/poly (methyl acrylate-meth-acyloxy-ethyl trimethylammonium chloride) nanospheres acted as liquid pigments to dye the fabric substrates by the impregnation method. In particular, the photostability of gardenia/poly (methyl acrylate-meth-acyloxy-ethyl trimethylammonium chloride) and the reflection of its dyed fabrics are distinctly described, the comparison of the dyeing property effect between gardenia/poly (methyl acrylate-meth-acyloxy-ethyl trimethylammonium chloride) and gardenia yellow dyed by mordant dyeing were analyzed. According to the experimental findings, the dyestuff nanospheres have high stability when the pH is 7–8, the mass ratio of gardenia yellow to poly (methyl acrylate-meth-acyloxy-ethyl trimethylammonium chloride) nanospheres was 12.8:1, the temperature was 60°C for 30 min, and the mixing speed was 500 rpm. Dyeing cotton fabrics with gardenia/poly (methyl acrylate-meth-acyloxy-ethyl trimethylammonium chloride) produced higher color strength and color fastness than the gardenia yellow with mordant dyeing.
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ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 31
·1801139
·
IF 13.325
Ning Ma,Ming-Kang Zhang,Xiao-Shuang Wang,Lu Zhang,Jun Feng,Xian-Zheng Zhang
Telluride molybdenum (MoTe 2 ) nanosheets with wide near-infrared (NIR) absorbance are functionalized with polyethylene glycol-cyclic arginine-glycine-aspartic acid tripeptide (PEG-cRGD). After loading a chemotherapeutic drug (doxorubicin, DOX), MoTe 2 -PEG-cRGD/DOX is used for combined photothermal therapy and chemotherapy. With the high photothermal conversion efficiency, MoTe 2 -PEG-cRGD/DOX exhibits favorable cells killing ability under NIR irradiation. Owing to the cRGD-mediated specific tumor targeting, MoTe 2 -PEG-cRGD/DOX shows efficient accumulation in tumors to induce a strong tumor ablation effect. MoTe 2 -PEG-cRGD nanosheets, which are relatively stable in the circulation, could be degraded under NIR ray. The in vitro and in vivo experimental results demonstrate that this theranostic nanoagent, which could accumulate in tumors to allow photothermal imaging and combined therapy, is readily degradable in normal organs to enable rapid excretion and avoid long-term retention/toxicity, holding great potential to treat tumor effectively.
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ChemPlusChem
·
2016
·Vol. 81
·期 11
·1166-1173
·
IF 2.836
Xiaozhao Wang,Kui Cheng,Wenjian Weng,Huiming Wang,Jun Lin
Graphical Break away : Carbon quantum dots (CQDs) have been incorporated as a sensitizer into TiO 2 films to regulate the light-induced cell-detachment performance. This incorporation inhibits charge recombination of the TiO 2 system under UV illumination, which increases the negative surface potential and changes the secondary structure of adsorbed extracellular protein molecules, and consequently results in a faster release of cells (see figure). Carbon quantum dots (CQDs) have been incorporated as a sensitizer into TiO 2 films to regulate the light-induced cell-detachment performance. Depending on the amount of CQDs incorporated, nanodots or porous films are obtained. It was found that the right amount of CQDs incorporation significantly improves the cell-sheet detachment efficiency, and an intact cell sheet could be obtained after merely five minutes of UV illumination (365 nm, UV365), which is much faster than that from CQDs-free TiO 2 film. Furthermore, cell sheets on CQDs-sensitized TiO 2 films show improved viability, and alkaline phosphatase and collagen I activity either before or after light-induced detachment. The improved cell-detachment performance is ascribed to the effective inhibition of charge recombination of the TiO 2 film and the microstructure variations, which increase the negative surface potential and change the secondary structure of the adsorbed extracellular protein molecules; this results in a faster release of cells. It is suggested that the faster release reduces the possible detrimental impact on cell functions during detachment and helps in maintaining the excellent cellular activity. This study demonstrates that CQDs sensitization is an effective approach for optimizing the performance of light-induced cell-sheet harvest.
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Catalysis Science & Technology
·
2019
·Vol. 9
·期 19
·5383-5393
·
IF 5.726
Qingquan Tang,Jiang Gong,Qiang Zhao
Organic photocatalysts have recently drawn intense attention to wastewater treatment through the efficient utilization of solar energy. Rational design and synthesis of organic photocatalysts with facilitated charge-carrier transfer are crucial for achieving high-performance photodegradation of pollutants. In this work, functional polymers of intrinsic microporosity (PIMs) were synthesized by a quaternization reaction, and the zwitterionic and D–π–A structured polymers show visible-light-driven catalytic activity for the degradation of organic pollutants. The formation of D–π–A structures in PIMs is demonstrated to extend visible-light absorption and promote charge-transfer transition. Besides, the zwitterionic structures improve hydrophilicity and induce the aggregation of polymer chains, facilitating charge-carrier diffusion at the polymer–water and polymer–polymer interfaces. The combination of these favorable features endows the resulting PIMs with high catalytic degradation ability toward organic dyes under visible-light irradiation, which prevails over state-of-the-art organic photocatalysts.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2017
·
IF 2.552
Yanxiang Zhang,Juan Wu,Yangyang Deng,Yanjun Xin,Huiling Liu,Dong Ma,Nan Bao
Ag/GO/g-C 3 N 4 composites were successfully synthesized by a sonochemical method. The structure and properties of the composites at various Ag loadings were characterized, and the Ag nanoparticles were confirmed by XRD, TEM and XPS measurements. UV–Vis diffuse reflectance spectra showed the presence of surface plasmon peak for Ag at 550 nm. The Ag/GO/g-C 3 N 4 composites demonstrated excellent activity in photocatalytic degradation of Rh B under visible light irradiation, and 5% of Ag nanoparticle was found to be the most suitable loading. The enhanced photocatalytic activity was ascribed to the role of GO nanosheets and Ag nanoparticles. The GO nanosheets acted as electrons transporter and acceptor in the composite and inhibited the charge recombination. The Ag nanoparticles acted as an electron traps to facilitate the separation of photogenerated electron-hole pairs and promoted interfacial electrons transfer. The OH ads and h + were the major radicals to be involved in the photocatalytic process.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhijing He,Chen Jiao,Hanxu Zhang,Deqiao Xie,Mengxing Ge,Youwen Yang,Guofeng Wu,Huixin Liang,Lida Shen,Changjiang Wang
Zirconia (ZrO 2 ) and calcium silicate (CS) are widely used in bone repair. Zirconia has excellent mechanical properties , while calcium silicate has exceptional biological activity. A porous ZrO 2 /CS composite ceramic scaffold was formed by digital light processing (DLP) technology in this study. The microstructure analysis demonstrated that CS was embedded between ZrO 2 particles. Mechanical tests showed that interconnected CS particles could improve mechanical properties, while discrete CS particles led to a decrease in that. Cell experiments showed that adding CS to ZrO 2 had a positive effect on cell proliferation and differentiation. In vitro degradation test showed that the weight loss of scaffolds in four weeks increased form −0.63%–1.42% with the increase of CS content. Moreover, the degradation of scaffold promoted the deposition of apatite , which was beneficial to the integration of the scaffold with living bone. In conclusion, the ZrO 2 /CS composite scaffold had better biocompatibility compared with the ZrO 2 scaffold, which showed a potential solution for 3D printing bone repair scaffolds.
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Russian Journal of Physical Chemistry A
·
2019
·Vol. 93
·期 2
·393-399
·
IF 0.581
Baogang Wang,Bin Zhao
Abstract Carbon dots (CDs)/CoFe 2 O 4 mesporous nanosphere composites were prepared. In comparison with CoFe 2 O 4 , the CDs/CoFe 2 O 4 composites exhibited the enhanced photocatalytic activity in the degradation of methylene blue (MB) in the presence of H 2 O 2 under the visible light irradiation. Specifically, the degradation rate attained using the CDs(4 wt %)/CoFe 2 O 4 composite was about 3.65 times higher than that with neat CoFe 2 O 4 . Moreover, the CoFe 2 O 4 paramagnetic nanospheres allowed facile repeatable use of CDs/CoFe 2 O 4 composites after magnetic separation. After five runs, the reduction of degradation rate was less than 5%, reflecting favorable photostability and magnetic separability of CDs/CoFe 2 O 4 composites. The CDs not only enhanced visible light utilization efficiency of CoFe 2 O 4 due to up-conversion photoluminesence, but also promoted the transfer and separation of electron-hole pairs as a result of their outstanding charge transfer characteristics, which collectively accelerate the generation of reactive species (such as • \({\text{O}}_{2}^{ - }\) , • OH, and h + ) in the presence of H 2 O 2 .
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Huilei Wang,Yilin Le,Jianzhong Sun
Widespread application of synthetic dyes could generate colored wastewaters causing a range of serious environmental problems. Due to the complex nature of effluents from textile industries , it is difficult to obtain satisfactory treatment of dyes-contaminated wastewater using one single method. Biohybrids coupling of photocatalysts and biocatalysts have great potential in environmental purification. However, how to select suitable organisms and enhance the hybrid’s catalytic activities remain challenging. Here, a novel biohybrid system ( Clostridium thermocellum -CdS), created for light-driven biodecolorization under thermophilic treatment by using non-photosynthetic microorganism C. thermocellum self-photosensitized with CdS nanoparticles was established. The biohybrids exhibited remarkable decolorization effects on triphenylmethane dyes. The highest decolorization rate was 0.206 min −1 . More importantly, enhanced catalytic activities of cadmium sulfide (CdS)-based biohybrids by controlling the particle sizes of semiconductors were demonstrated. Biohybrids systems ( Clostridium thermocellum -CdS) through the self-precipitation of CdS with different particle sizes not only showed dramatic changes in the optical properties but also exhibited a very different decolorization rate. This work can not only further broaden targeted applications of CdS-based biohybrids but also demonstrate a promising route for improving biohybrids corresponding photocatalytic capabilities through in situ precipitation CdS with different particle sizes.
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COLLOID AND POLYMER SCIENCE
·
2020
·Vol. 298
·期 10
·1285-1291
·
IF 1.536
Xie Chuanbao,Leng Kangwei,Sheng Jie,Wang Xuemei,Li Qianmin,Song Liang,Liu Lei,Sun Hejing,Huang Xiaowen,Wang Zhongwei,Yu Qing
Poly(methyl methacrylate) (PMMA) microspheres were synthesized through visible light–induced photopolymerization of methyl methacrylate (MMA). 2,4,6-Trimethylbenzoyldipenylphosphine oxide (TPO), polyvinylpyrrolidone (PVP), and light-emitting diodes (LEDs) were used as the photoinitiator, stabilizer, and light source, respectively. No other additive was involved. The effect of LEDs, TPO, and PVP was discussed. Results showed that PMMA microspheres with the size of 0.5–0.8 μm could be obtained when LED@385 nm was the light source, and the content of TPO and PVP was 2 wt% and 30 wt% of MMA. Moreover, the possible formation pathway of PMMA microspheres was proposed based on the investigation of reaction time and addition method of PVP.
Graphical abstract
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jielin Huang,Jing Liu,Lina Tian,Xiangli Li,Xinqi Ma,Xin Yu,Quanhui Guo,Junwei Zhao
Broadband solar light absorption and visible light photocatalysis of surface modified ultrawide bandgap semiconductors are receiving wide attentions because of their more negative conduction band potential and positive valence band potential for refractory organics degradation. Here, we reported a novel modified solvothermal strategy by the introduction of distilled water into small molecular alcohols to synthesize crystallized carbon-coated Zr 3+ -ZrO 2 composites for enhanced visible light absorption and visible light photocatalytic tetracycline degradation, in which the distilled water favored for the crystallization of Zr 3+ -ZrO 2 and the formed ultrathin carbon layers derived from the polymerization of small molecular alcohols were contributing to the generation of Zr 3+ species and well dispersion of Zr 3+ self-doped ZrO 2 nanoparticles. The experimental results also showed that carbon-coated Zr 3+ -ZrO 2 composites exhibited enhanced visible light absorption, long-lived charges, efficient visible light photocatalytic performance and good recyclable stability. Besides, possible photocatalytic mechanism and antibiotic degradation pathways over carbon-coated Zr 3+ -ZrO 2 composites under visible light irradiation were also proposed in detail.
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Polymer Chemistry
·
2013
·Vol. 5
·期 6
·2018-2026
·
IF 5.231
Weipu Zhu,Lilong Gao,Qiaojie Luo,Chen Gao,Guangyu Zha,Zhiquan Shen,Xiaodong Li
This study presented a facile method to prepare two PEG derivatives with multi-thiols or multi-enes by polycondensation on a large scale using scandium trifluoromethanesulfonate (Sc(OTf)3) as highly efficient and chemoselective catalyst. A novel type of biodegradable and biocompatible PEG hydrogel was easily obtained through the thiol–ene “click” reaction under physiological conditions. 1H NMR spectra and GPC were used to characterize the chemical compositions and molecular weights of the two PEG derivatives. FT-IR and rheological experiments were used to investigate the gelation behavior of the PEG hydrogel. Degradation studies revealed a precursor concentration-dependent degradation behavior of the resultant PEG hydrogel. In vitro cell viability assay showed the excellent biocompatibility of the two precursors and also the resultant hydrogel. Furthermore, the rat model of abdominal sidewall defect-cecum abrasion suggested that the PEG hydrogel developed in the present study is a promising physical barrier for the prevention of post-operative peritoneal adhesion.
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危险品化学品经营许可证（带存储）