COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Chaole Yun,Liwen Wang,Yang Zhou,Yingying Wang,Chen Li,Lili Liang,Xuegang Luo
A novel flower-like photocatalyst BiOBr/NaCo 2 O 4 nanocomposite was successfully synthesized via a simple hydrothermal method . The as-obtained samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrophotometry (FT-IR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), photoluminescence spectroscopy (PL), Electron spin response (ESR), N 2 adsorption-desorption measurements and UV–vis diffuse reflectance spectroscopy (UV–vis DRS), respectively. The results showed that BiOBr/NaCo 2 O 4 nanocomposite possessed enhanced photocatalytic activity for the removal of Rhodamine B (RhB) and colorless tetracycline hydrochloride (TC) under visible-light irradiation as compared with pure BiOBr and NaCo 2 O 4 . Moreover, coupling with NaCo 2 O 4 was concluded to broaden the absorption of visible-light irradiation and inhibit the recombination of the electron-hole pairs on the interface between BiOBr and NaCo 2 O 4 , which enhanced the activity of the photocatalyst. In addition, the narrower energy bandgap of BiOBr/NaCo 2 O 4 nanocomposite makes a contribution to the enhancement of photocatalytic performance. Based on the radical-trapping experiments, a possible photocatalytic mechanism has been proposed.
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Scientific Reports
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2015
·Vol. 5
·期 1
·1-10
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IF 5.578
Gao Peng Fei,Yuan Bin Fang,Gao Ming Xuan,Li Rong Sheng,Ma Jun,Zou Hong Yan,Li Yuan Fang,Li Ming,Huang Cheng Zhi
Insight into the nature of metal-sulfur bond, a meaningful one in life science, interface chemistry and organometallic chemistry, is interesting but challenging. By utilizing the localized surface plasmon resonance properties of silver nanoparticles, herein we visually identified the photosensitivity of silver-dithiocarbamate (Ag-DTC) bond by using dark field microscopic imaging (iDFM) technique at single nanoparticle level. It was found that the breakage of Ag-DTC bond could be accelerated effectively by light irradiation, followed by a pH-dependent horizontal or vertical degradation of the DTC molecules, in which an indispensable preoxidation process of the silver was at first disclosed. These findings suggest a visualization strategy at single plasmonic nanoparticle level which can be excellently applied to explore new stimulus-triggered reactions and might also open a new way to understand traditional organic reaction mechanisms.
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ACS Sustainable Chemistry & Engineering
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2018
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IF 6.14
Xiaozi Lin,Xi Wang,Qingwei Zhou,Chengyan Wen,Shaoqiang Su,Jie Xiang,Pengfei Cheng,Xianbiao Hu,Ye Li,Xin Wang,Xingsen Gao,Richard Nözel,Guofu Zhou,Zhang Zhang,Junming Liu
Photocatalysis is one of the most promising technologies in wastewater treatment. However, the inactivity to visible light and the inconvenience to recycle severely limit its practical application. In this work, via a facile hydrothermal method, Fe3O4 NPs were integrated onto the surfaces of 3D ball-flower-like MoS2 microspheres as efficiently visible light responsive and magnetically recyclable photocatalysts. Experimental results indicate that, an optimal loading amount (20 wt %) of Fe3O4 NPs can not only effectively enhance the photocatalytic ability of the MoS2/Fe3O4 (MF) hybrid composite with approximately 2 times better than pure MoS2, but also make it conveniently recycle from water by an external magnetic field. The photoelectrochemical studies also reveal that the incorporation of Fe3O4 NPs can effectively enhance the charge transfer rate and accelerate separation of photoinduced charge carriers. The surface catalytic mechanism of MF hybrid composite was also explored through XPS spectra. With both the excellent photocatalytic performance and magnetical recyclability, the 20 wt %-MF hybrid composite is considered to be a promising and competitive photocatalyst for wastewater treatment utilizing solar energy.
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Qiaoyuan Gao,Dagang Lin,Yongjie Fan,Qin He,Qi Wang
Visible-light-active Fe-2MI assemblies were prepared at room temperature using 2-Methylimidazole (2MI) as organic ligand to form complex with Fe(II) or Fe(III). TGA and XRD characterizations indicated that Fe(II) can form more stable complex and higher coordinating percentage with 2MI relative to Fe(III). Besides, Fe(II)-2MI displayed amorphous state with larger BET surface area and higher photocurrent response. At very low catalyst dosage (0.1 g/L), highest activity for Cr(VI) reduction can be achieved using Fe(II)-2MI as photocatalyst. The estimated pseudo-first-order rate constant (0.021 min −1 ) was 1.4 and 2.1 times that on Fe(III)-2MI and Fe(II)-NaOH, respectively. The well-known ZIF-67 (Co-2MI), ZIF-7 (Zn-2MI) and Fe-MOFs with other organic ligands (H 2 BDC, NH 2 -H 2 BDC or FA) were also used as control samples. Optimal activity for photocatalytic reduction of Cr(VI) was achieved by Fe(II)-2MI. The operating factors was optimized at acidic pH (2.0), higher catalyst dosage (0.3 g/L) and appropriate concentration of coexisting organics (2.0 mM) within the tested range. The stability of Fe(II)-2MI was investigated at different pH values (2, 3 and 4.64), which all displayed good stability. Mechanism study indicated that Fe(II)-2MI has adequate conduction and valence band positions for Cr(VI) reduction and organics oxidation, respectively. Therefore, the as-prepared amorphous Fe(II)-2MI assemblies may be cheap, stable and easy available candidate for the photocatalytic disposal of Cr(VI)-containing wastewaters.
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BIOSENSORS & BIOELECTRONICS
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2019
·
IF 9.518
Jian Wang,Zhao Yang,Wei Chen,Liping Du,Bo Jiao,Steffi Krause,Ping Wang,Qiuping Wei,De-Wen Zhang,Chunsheng Wu
Modulated light-activated electrochemistry (MLAE) at semiconductor/liquid interfaces derived from light-addressable potentiometric sensor (LAPS) and light-activated electrochemistry (LAE) for addressable photoelectrochemical sensing has been proposed as a new sensor platform. In this system, a bias voltage is applied to create a depletion layer at the silicon/electrolyte interface. Meanwhile, intensity-modulated light illuminates the movable electrode to generate electron/hole pairs and causes a detectable local AC photocurrent . The AC measurement showed a higher signal-to-noise ratio (SNR) of photocurrents compared to the traditional DC response, while a steeper photocurrent-voltage ( I-V ) curve than that of LAPS with an insulating layer was obtained. Furthermore, to stabilize and functionalize the silicon substrate, metal-organic framework (MOF) nanoparticles were grown in-situ on the silicon electrode. The successful modification was validated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The AC photocurrent increased as a result of the adsorption of negatively charged DNA , which contributed to the enhancement of the cathodic reduction process at the semiconductor electrodes, indicating a different response mechanism of MLAE from LAPS. The results obtained demonstrate the potential of MOF functionalized MLAE as a robust platform for light-addressable DNA chips with high sensitivity and specificity.
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International Journal of Bioprinting
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2022
·
IF 7.422
Haowen Liang,Yue Wang,Shangsi Chen,Yang Liu,Zhengbai Liu,Jiaming Bai
The morphologies and structures of the scaffold have a significant influence on their mechanical and biological properties. In this work, different types of porous structures: Triply periodic minimal surface-Schwarz primitive (P), body-centered cubic, and cubic pore-shaped (CPS) hydroxyapatite scaffolds with ~70% porosity were fabricated through digital light processing (DLP) 3D printing technology. The compressive properties and in vitro cell evaluations such as cell proliferation and attachment morphology of these scaffolds were systematically compared. The results showed that the CPS scaffolds exhibited the highest compressive strength (~22.5 MPa) and modulus (~400 MPa). In addition, the CPS scaffolds also performed the most active cell metabolisms as compared to other two structures, which may account for the larger pore size and smaller curvature of the substrate. This study provides a general guidance for the fabrication and selection of porous bone scaffolds processed by DLP 3D printing.
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Acta Biomaterialia
·
2017
·
IF 6.319
Yi Chen,Haohuan Li,Yueyang Deng,Haifeng Sun,Xue Ke,Tianyuan Ci
The combination of chemotherapy and photothermal therapy is a promising strategy for cancer treatment. In the present study, indocyanine green (ICG), a widely used near-infrared (NIR) dye in photothermal therapy, and chemotherapeutic drug-doxorubicin (DOX) were loaded within the nanoparticles of novel designed arylboronic ester and cholesterol modified hyaluronic acid (PPE-Chol 1 -HA), denoted as PCH-DI. We take advantage of reactive oxygen species (ROS) production capability of ICG and ROS-sensitivity of arylboronic ester to realize controllable drug release. It was confirmed that PCH-DI exhibited remarkable photothermal effect and light-triggered faster release of DOX with NIR laser irradiation. DOX in PCH-DI/Laser group exhibited the most efficient nucleus binding toward HCT-116 colon cells in vitro . Furthermore, enhanced cytotoxicity and promoted tumor growth suppression effect of PCH-DI on HCT-116 tumor xenograft nude mice and AOM-induced murine orthotopic colorectal cancer model was achieved under NIR laser irradiation. Thus, the co-delivery system based on PCH appears to be a promising platform for the combined chemo-photothermal therapy in tumor treatment. Statement of Significance In case of chemo-photothermal combination therapy, the synchronism of treatments plays an important role in achieving expected antitumor efficiency. In this study, a light triggered ROS mediated drug delivery system was developed with the help of ROS-sensitive moieties of arylboronic ester and ROS producer of ICG. We innovatively make use of the ROS production capability of ICG under NIR laser irradiation to promote a faster release of DOX resulting from swelling of PCH-DI due to the presence of arylboronic ester. Intracellular ROS detection demonstrated that ROS level of PCH-I increased under irradiation. Moreover, the faster release behavior of DOX from PCH-DI with NIR laser irradiation was confirmed by the in vitro drug release and cellular uptake study. Meanwhile, local hyperthermia was verified by photothermal effect tests. Therefore, the synchronism of the combination therapy was achieved via light triggered faster release of DOX (chemo-therapy) and local hyperthermia (thermal-therapy) using PCH-DI under irradiation. It was reasonable to attribute the efficient anti-tumor efficiency of PCH-DI both in vitro and in vivo to the enhanced synergistic effect of chemo-photothermal combination therapy with realization of synchronism. To this end, this novel co-delivery system has provided a promising solution for achieving the synchronism of treatment to strengthen the efficiency of combination therapy.
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CHEMISTRY OF MATERIALS
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2019
·
IF 10.159
Fei Wang,Zhenwei Yuan,Patrick McMullen,Ruixi Li,Jinrong Zheng,Yue Xu,Mingjun Xu,Qing He,Bowen Li,Haiyan Chen
Conventional chemotherapeutic drugs cause systemic side effects due to nonspecific interactions with healthy tissues, which significantly hinders their tolerability and efficacy. Herein, we developed an intelligent drug delivery system, in which the drug release can be triggered by near-infrared (NIR) light at the tumor locus, prohibiting damage to normal tissues. This light-responsive system was established based on lipid nanoparticles consisting of a eutectic mixture of lauric acid and stearic acid, which have a melting point at 39 °C. Anticancer drug doxorubicin and NIR-absorbing dye methylenebisacrylamide were coencapsulated into these nanoparticles, while cRGD and CD47 peptide were conjugated on their surfaces for tumor targeting and immune evasion. The resultant nanoparticles exhibited quick drug release in response to NIR irradiation, prominent photothermal effects, and good cancer-targeting ability. Furthermore, in vivo studies in multiple tumor models all showed that the nanoparticles could specifically accumulate at the tumor site and drastically reduce tumor size without systemic side effects, demonstrating the promising potential of this intelligent drug delivery system for future cancer treatment.
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Biomaterials Science
·
2021
·Vol. 9
·期 21
·7115-7123
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IF 6.843
Hongtong Lu,Shasha He,Qingfei Zhang,Xiaoyuan Li,Zhigang Xie,Zigui Wang,Yanxin Qi,Yubin Huang
The clinical application of conventional chemotherapeutic agents, represented by cisplatin, is limited by severe side effects. So, it is essential to explore more safer and controlled drug delivery systems for synergistic chemotherapy. In this work, we designed dual-sensitive dual-prodrug nanoparticles (DDNPs) for photoactivated platinum-based synergistic chemotherapy. With photosensitivity, DDNPs could be photoactivated from inert Pt(IV) to toxic Pt(II) under safe UVA light in a spatiotemporally controlled manner. Concurrently, mild could be generated from DDNPs to assist the endo/lysosomal escape of DDNPs for better photoactivated chemotherapy (PACT). Furthermore, with acid-sensitivity, demethylcantharidin (DMC), a protein phosphatase 2A (PP2A) inhibitor, was released to block the DNA repair pathway and thereby could sensitize platinum-based chemotherapy in intracellular acidic microenvironments. Along with a precise ratio (Pt : DMC = 1 : 2), DDNPs had a powerful synergistic anti-cancer effect in vitro and in vivo. In the future, DDNPs have great potential as a safe and multifunctional drug delivery system for precise nanomedicine in clinical treatments.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Xinzhou Huang,Long Ren,Chunyun Jiang,Xiangxiang Han,Xiaoshuang Yin,Ying Liu,Wenzhong Yang,Yun Chen
Photoelectrochemical enzymatic biofuel cell (PEBFC) shows the obvious advantages in the renewable energy conversion field. However, because of the low utilization efficiency of solar energy and the unendurable power output, PEBFC cannot satisfy the demand of practical applications. Herein, a novel PEBFC prototype is designed. Taking a TiO 2 nanorod arrays (NRAs) decorated graphene–cadmium sulfide quantum dots (GR–CdS QDs) hybrid at fluorine-doped tin oxide (FTO) glass electrode as the photoanode, it can catalyze the oxidation of ascorbic acid (AA) effectively, with the oxidation current being as high as –137.8 μA cm −2 , and the anodic open circuit potential ( E a O C P ) reaching approximately –0.52 V; using a laccase–bound three–dimensional graphene–single walled carbon nanotubes (3D GR–SWCNTs–laccase) hybrid electrode as the biocathode, along with 2,2′-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS), the biocathode can catalyze the reduction of oxygen remarkably, and the cathodic open circuit potential ( E c OCP ) is as high as 0.54 V. Under optimal conditions, such PEBFC can obtain sufficient high open circuit voltage (V oc ) of 1.05 V and maximum power output density (P max ) of 227.5 μW cm −2 , respectively. Two PEBFCs connected in series can light a red light-emitting diode (LED) successfully.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Gongduan Fan,Xia Li,Jiuhong Lin,Xinyi Wu,Ling Zhang,Jiaxin Wu,Yingmu Wang
In this work, a facile separation of self-floating Ag 3 VO 4 /BiVO 4 hydrogel (ABVH) photocatalyst was constructed via the freeze-thaw method for the inactivation of Microcystis aeruginosa . The as-synthesized photocatalyst exhibited excellent photocatalytic performance, resulting in the degradation efficiency of chlorophyll a reaching approximately 99.6% within 4 h under visible light. The cell morphology, intracellular organic matter (IOM), extracellular organic matter (EOM), and antioxidant system were severely disrupted during the photocatalytic process. The inactivation mechanism could be ascribed to the ·OH and h + generated by hydrogel photocatalyst under visible light irradiation. Furthermore, five repetitive experiments and cyclic compressive stress-strain tests demonstrated that the as-prepared hydrogel possessed excellent reusability and mechanical strength properties. Besides, the hydrogel photocatalyst showed excellent potential for the removal of M. aeruginosa in the presence of natural organic matter (NOM). Overall, the synthesized self-floating hydrogel photocatalyst may offer a novel insight into the control of harmful cyanobacterial blooms.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Yun Zheng,Lili Zhang,Yuke Li,Yayun Wang,Jingling Chen,Bizhou Lin,Yanzhen Zheng,Lin Cheng,Sibo Wang,Yilin Chen
Polymeric carbon nitride (CN) has evoked considerable attention in photocatalysis, however, its π-deficiency conjugated frameworks engendering weak visible-light absorption and rapid charge recombination hinder the practical utilizations. Herein, a novel donor–acceptor (D-A) conjugated polymer based on triptycene incorporated carbon nitride ( T -CN) has been facilely prepared by thermal copolymerization of melamine and 2,6,14-triaminotriptycene. Combined with the density functional theory (DFT) calculations, it is found that the formation of intramolecular charge transfer and the extended π-conjugative effect in the D-A structure contribute to a broadened light-harvesting spectral range, a higher charge separation/transfer efficiency and more active sites of T -CN for photoredox reactions. The T -CN catalyst accomplished superior visible-light photocatalytic performance in both hydrogen evolving and carbon dioxide reduction. The optimal T -CN catalyst exhibited the highest hydrogen evolution rate of 80.9 ± 1.3 μmol·h −1 and carbon monoxide production rate of 8.1 ± 0.2 μmol·h −1 , which are ca. 8-fold and 20-fold of bulk CN, respectively. The convenient strategy of constructing D-A conjugated structure opens up a new intriguing avenue toward the rational creation of efficient polymeric nanomaterials for versatile applications of solar fuel production.
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