RSC Advances
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2018
·Vol. 8
·期 60
·34428-34436
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IF 2.936
Sihui Zhan,Qianlei Hou,Yi Li,Shuanglong Ma,Pengfei Wang,Yanan Li,Haitao Wang
Visible-light-driven photocatalytic disinfection is highly desired for water treatment due to its advantages such as wide applicability and being free of disinfection byproducts. In this study, AgBr/g-C3N4 hybrid nanocomposites were evaluated as photocatalysts under visible light irradiation for water disinfection using Escherichia coli as a model pathogen. The physicochemical and photo-electrochemical properties of the photocatalyst were systematically characterized using advanced techniques including scanning electron microscopy (SEM), transmission electron microscopy (HRTEM), powder X-ray diffraction (XRD), UV-visible diffuse reflectance spectra (DRS), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectra and electron spin resonance (ESR) spectroscopy. The inactivation mechanism of E. coli was systematically investigated by monitoring the morphology change of the bacteria and analyzing the role of reactive species. The optimized AgBr/g-C3N4 hybrid photocatalyst exhibited remarkably enhanced visible-light-driven photocatalytic disinfection performance towards E. coli over that of pure g-C3N4 and AgBr under visible light, which could completely inactivate 107 cfu mL−1 E. coli in 90 min. Quenching studies indicated that h+ is the main reactive species responsible for inactivating E. coli. The mechanism study revealed a Z-scheme charge transfer mechanism between AgBr and g-C3N4. The g-C3N4 could effectively trap the photogenerated conduction band electrons of AgBr via a Z-scheme type of route, thus significantly promoting the electron–hole separation. The trapping of electrons by g-C3N4 could facilitate h+ accumulation, which accounts for the better disinfection performance of AgBr/g-C3N4 compared to AgBr and g-C3N4.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2018
·Vol. 42
·期 19
·15974-15984
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IF 3.201
Wenqian Fan,Zhi Zhu,Yang Yu,Zhi Liu,Chunxiang Li,Pengwei Huo,Yue Qiu,Yongsheng Yan
In the present work, the ternary hybrid photocatalyst Fe3O4@g-C3N4/RGO is developed by a facile hydrothermal method, which shows a satisfactory degradation rate (90%) and stability in degrading tetracycline. The improvement in the photocatalytic activity of the ternary hybrid photocatalyst is attributed to the Fe3O4 nanobelt and RGO. As a center of oxidation–reduction, the Fe3O4 nanobelt can utilize electrons effectively. RGO with good conductivity is an outstanding electron transporter, which inhibits the recombination of electron–hole pairs. Moreover, the results of the ESR and the radical capture experiment prove that h+ and ˙O2− are the major active species in the tetracycline removal process. At the same time, the degradation intermediates of tetracycline and the photocatalytic mechanism is discussed in this paper in depth. The novel design concept is expected to be used in practical applications.
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JOURNAL OF MEMBRANE SCIENCE
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2013
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IF 4.093
Guoliang Zhang,Shufei Lu,Liang Zhang,Qin Meng,Chong Shen,Jiwei Zhang
Hybrid membranes formed by blending TiO 2 nanoparticles and organic materials are attractive for creating new materials with enhanced properties such as high permselectivity, good hydrophilicity and excellent fouling resistance in a wide range of applications. In order to overcome the agglomeration of nanoparticles in membranes and leakage of nanoparticles from nanocomposite membranes in the water treatment process and enhance the hydrophilicity of membranes, polymer chains of HEMA (2-hydroxyethyl methacrylate) were grown from TiO 2 by the atom transfer radical polymerization (ATRP) process in methanol. The hybrid polysulfone (PSF) membranes were then prepared by adding different ratios of TiO 2 (T membranes) and TiO 2 -g-HEMA (HT membranes) particles via phase inversion induced by the immersion precipitation technique. The modification nanoparticles were found to provide obvious improvements in reducing the particles agglomeration and fouling in sheet membranes. Different techniques such as SEM, TEM , FTIR, EDS, contact angle goniometry and filtration experiments of water, BSA and EPS were applied to characterize and explore the performance of particles and membranes. Compared with unmodified TiO 2 particles, modified TiO 2 particles held enhanced hydrophilicity, better compatibility and dispersibility in organic solvent and matrix polymer . Similarly, the HT membranes exhibited superior water flux and anti-pollution performance in separation than the pure PSF membrane and T membranes.
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ACS Applied Materials & Interfaces
·
2014
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IF 5.9
Huabo Huang,Wan Li,Hong Wang,Xiaoping Zeng,Qin Wang,Yajiang Yang
Novel conducting hydrogels (PVA-TA) with dual network structures were synthesized by the grafting reaction of tetraaniline (TA) into the main chains of poly(vinyl alcohol) and in situ reinforced by self-assembly of a sorbitol derivative as the gelator. The chemical structure of the PVA-TA hydrogels was characterized by using FT-IR and NMR. The mechanical strength of the PVA-TA hydrogels was strongly improved due to the presence of supramolecular nanofibers. For instance, the compressive and tensile strengths of supramolecular nanofiber-reinforced hydrogels were, respectively, 10 times and 5 times higher than those of PVA-TA hydrogels. Their storage modulus (G′) and loss modulus (G″) were 5 times and 21 times higher than those of PVA-TA hydrogels, respectively. Cyclic voltammetry and conductivity measurements indicated that the electroactivity of reinforced hydrogels is not influenced by the presence of supramolecular nanofibers.
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Journal of Materials Chemistry A
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2015
·Vol. 3
·期 30
·15710-15714
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IF 7.443
Ming Wu,Jun-Min Yan,Xue-Wei Zhang,Ming Zhao,Qing Jiang
Ag2O modified g-C3N4 (Ag2O/g-C3N4) was synthesized by a facial hydrothermal reaction. The as-prepared Ag2O/g-C3N4 shows efficient photocatalytic properties for hydrogen evolution from water splitting under visible light irradiation. The rate is about 274 times higher than that of pure g-C3N4, and is even better than that of Pt/g-C3N4. More importantly, Ag2O/g-C3N4 also demonstrates a relatively good recycling stability for photocatalytic hydrogen evolution.
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Biomed Research International
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2014
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IF 0
Yihang Huang,Jun Liu,Yani Cui,Huanan Li,Yong Sun,Yujiang Fan,Xingdong Zhang
Reduction-triggered breakable polymeric micelles incorporated with MTX were prepared using amphiphilic PAA-g-PEG copolymers having S–S bonds in the backbone. The micelles were spherical with diameters less than 70 nm. The micelles could encapsulate the hydrophobic MTX in the hydrophobic core. The drug loading content and drug loading efficiency of the micelles were highly dependent on the copolymer chemical structure, ranging from 2.9 to 7.5% and 31.9 to 82.5%, respectively. Both the drug loading content and drug loading efficiency increased along with more hydrophobic segments in the copolymers. In normal circumstance, these micelles were capable of keeping stable and hold most of the MTX in the core, stabilizing the incorporated MTX through the
stacking with the phenyl groups in the backbone of the copolymers. In reductive environments that mimicked the intracellular compartments, the entire MTX payload could be quickly released due to the reduction-triggered breakage of the micelles. These micelles showed good antiproliferative activity against several cancer cell lines, including KB, 4T-1 and HepG2, especially within the low drug concentration scope.
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BIOSENSORS & BIOELECTRONICS
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2013
·
IF 5.437
Yanli Hao,Qingquan Guo,Hanyin Wu,Liangqia Guo,Liangshuang Zhong,Jing Wang,Tianran Lin,FengFu Fu,Guonan Chen
An amplified colorimetric detection of Hg 2+ is proposed by combining T–Hg 2+ –T base pairs and hybridization chain reaction (HCR). Two hairpins consisting of three-fourths and one-fourth of the horseradish peroxidase (HRP)-mimicking DNAzyme in inactive configuration are used as functional elements. In the presence of Hg 2+ , one of the hairpins is opened by an assistant probe with the help of T–Hg 2+ –T base pairs and this triggers an autonomous cross-opening of the two hairpins using the strand displacement principle, resulting in the formation of DNA nanowires consisting of numerous reunited Q-quadruplex DNAzyme units. The resulting catalytically active hemin/G-quadruplex HRP-mimicking DNAzymes catalyze the oxidation of ABTS 2− by H 2 O 2 into a green-colored cationic radical ABTS •+ for the colorimetric readout. This “turn-on” sensing system enables the high sensitive and selective detection of aqueous Hg 2+ with a detection limit of 9.7 pM.
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Journal of Nanomaterials
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2015
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IF 1.644
Xiaobin Fang,Yingqi Xu,Jinming Zhang,Xianghong Lu,Yitao Wang,Meiwan Chen
A novel amphiphilic derivative of chitosan, namely, a linoleic acid-g-quaternary chitosan (LA-g-QC), was designed and synthesized as low toxic material for biomedical applications in this study. The chemical structure of LA-g-QC was characterized by Fourier transform infrared spectroscopy (FTIR), 1H nuclear magnetic resonance (1H-NMR), and elemental analysis. LA-g-QC could form nanosized micelles with self-assembly, which was confirmed by the results of critical micelle concentration (CMC) via fluorescence spectroscopy. The average size of LA-g-QC was 140 nm and its zeta potential was approximately +35.50 mV. CMC value was 31.00 mg/mL. Furthermore, LA-g-QC micelles, at final concentrations between 0.94 μg/mL and 30 μg/mL, did not inhibit the proliferation of HepG2 or SMMC 7721 cell lines. Taken together, LA-g-QC has low cytotoxicity and high potential for the preparation of novel drug-delivery micelles.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2015
·
IF 7.435
Shun Fang,Yang Xia,Kangle Lv,Qin Li,Jie Sun,Mei Li
As a promising metal-free photocatalyst, graphitic carbon nitride (g-C 3 N 4 ) has attracted increasing attention. However, from the viewpoint of practical application, the quantum efficiency of g-C 3 N 4 needs to be further improved. In this article, carbon dots (C-dots) modified g-C 3 N 4 hybrid was successfully prepared by a novel strategy using C-dots and dicyandiamide as starting materials. The photocatalyst was characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), FT-IR, UV–Vis diffuse reflectance spectrum (DRS), X-ray photoelectron spectroscopy (XPS), powder photoluminescence (PL) and surface photovoltage spectrum (SPS). Both the photocatalytic activity of C-dots modified g-C 3 N 4 was evaluated by degradation of Rhodamine B under UV irradiation and photocatalytic hydrogen production under visible irradiation. The experimental results show that C-dots modification causes the lattice distortion of g-C 3 N 4 . With increase in the loading amount of C-dots, the photocatalytic activity of g-C 3 N 4 increase first and then decrease. g-C 3 N 4 modified with 0.25 wt.% C-dots shows the highest photocatalytic activity, which is 3 times higher than pristine g-C 3 N 4 . C-dots act as electron-sinks, which prevent the recombination of photo-generated electron-hole pairs, enhancing the photocatalytic activity of g-C 3 N 4 . However, too much C-dots become recombination centers, which is detrimental to the photocatalytic activity of g-C 3 N 4 .
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2014
·
IF 6.007
Haiping Li,Jingyi Liu,Wanguo Hou,Na Du,Renjie Zhang,Xutang Tao
Heterojunctions of graphitic carbon nitride (g-C 3 N 4 ) and Bi 2 MoO 6 were solvothermally synthesized and characterized by X-ray diffraction, Fourier transform-infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy (TEM) and high resolution TEM. The photocatalytic degradation activity of the g-C 3 N 4 /Bi 2 MoO 6 composites for Rhodamine B was examined under visible light irradiation. The heterojunction composites exhibited higher photocatalytic activity than pure g-C 3 N 4 or Bi 2 MoO 6 . The photocatalytic activity of the composites increased then decreased with increasing Bi 2 MoO 6 content. The g-C 3 N 4 /Bi 2 MoO 6 heterojunction with a Bi 2 MoO 6 content of 16.1 wt.% exhibited the highest photocatalytic activity, and its photocatalytic efficiency was more than three times those of pure g-C 3 N 4 or Bi 2 MoO 6 . The enhanced photocatalytic activity of the g-C 3 N 4 /Bi 2 MoO 6 heterostructure photocatalyst was attributed predominantly to the efficient separation of photoinduced electrons and holes. The g-C 3 N 4 /Bi 2 MoO 6 heterojunction photocatalyst exhibited excellent stability and reusability. A detailed mechanism for the enhanced photocatalytic activity is discussed. Superoxide radicals were the major active species. This study provides a visible light responsive photocatalyst with potential in environmental remediation applications.
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TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2017
·
IF 1.342
Li-li ZHENG,Xin-yan XIAO,Yang LI,Wei-ping ZHANG
TiO 2 /WS 2 /g-C 3 N 4 composite photocatalysts were synthesized by a liquid-exfoliation-solvothermal method. In this process, the WS 2 /g-C 3 N 4 nano-sheets were prepared by liquid-exfoliation method from the bulk WS 2 and C 3 N 4 in the alcohol system, and then the TiO 2 nanoparticles (NPs) grew on the WS 2 /g-C 3 N 4 nano-sheets by in-situ synthesized technique. The photocatalytic activity of the as-prepared samples was evaluated by photocatalytic degradation of methyl orange (MO). The results showed that the as-prepared samples exhibited higher photocatalytic activities as compared to the pure TiO 2 , g-C 3 N 4 and TiO 2 /g-C 3 N 4 composite. The enhanced photocatalytic activities of TiO 2 /WS 2 /g-C 3 N 4 photocatalysts could be attributed to the synergistic effect of heterostructure between TiO 2 NPs and WS 2 /g-C 3 N 4 nano-sheets, which could efficiently improve the separation of photogenerated electron/hole pairs and utilization efficiency of photons. The quenching tests of radicals indicated that ·O − 2 had crucial effect on degradation of MO, which demonstrated that ·O − 2 was the main active radical in photocatalytic reaction process.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
·
IF 2.714
Dinglong Zhu,Shaomin Liu,Meiling Chen,Jianshu Zhang,Xiaoxiao Wang
A novel, magnetically separable, and stable Fe 3 O 4 /graphitic carbon nitride (g-C 3 N 4 ) nanocomposites were prepared using a facile method. The as-prepared samples were characterized by X-ray diffraction, scanning electron microscope, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and UV–vis diffuse reflectance spectroscopy. The photocatalysis capability and stability of the as-prepared samples were studied by the degradation of rhodamine B (RhB) under simulated sun irradiation. In addition, the degree of mineralization of RhB and the optimum conditions (pH and dosage of catalyst) for the reaction system were investigated. Tetracycline was used to remove the sensitization effect. Fe 3 O 4 /g-C 3 N 4 nanocomposites not only had higher photocatalytic activity but also obtained magnetic property and stronger stability, which are important for the reuse in water pollutant treatment. Photoelectrochemical activities of Fe 3 O 4 /g-C 3 N 4 were also investigated. The photocurrent enhancement indicates a higher separation efficiency of electrons and holes due to the heterojunction between Fe 3 O 4 and g-C 3 N 4 . RhB degradation improved under acidic conditions and simulated sun irradiation, given that more OH is produced because of the oxidation of Fenton. The h + is a main participant in the degradation of RhB. Active species analysis showed that dissolved oxygen plays an important role in the formation of reactive species ( O 2 − and OH), which are also important participants in the degradation of RhB.
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