Lan Zhang

Fuzhou University, Min-hou, Fujian, China

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Publications (81)238.42 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: This work reports a facile ligand-free method for the rapid and highly specific separation of histidine (His)-rich proteins by using CuFe2O4 magnetic nanocrystal clusters (MNCs). Monodisperse CuFe2O4 MNCs were synthesized via a sample and economical one-pot hydrothermal process. The resulting MNCs were characterized in detail. The measurements indicated that the MNCs exhibited good dispersion, high crystallinity, and superparamagnetic properties. Moreover, the obtained MNCs had a high saturation magnetization (45.1 emu g-1), which was sufficient to accomplish fast and efficient separation with an external magnetic field. The selectivity and binding capacity of CuFe2O4 MNCs were evaluated by using a His-rich protein (bovine haemoglobin) and other proteins (bovine serum albumin, human serum albumin, myoglobin, lysozyme, cytochrome c and horseradish peroxidase) containing less surface-exposed His resides as model samples. The most distinct feature of the CuFe2O4 MNCs is the high haemoglobin binding capacity (4475 mg g-1) owing to the coordination between Copper (II) ions and surface-exposed histidine resides of haemoglobin. In addition, the CuFe2O4 MNCs can be successfully employed to selectively bind and removal abundant protein haemoglobin from human blood samples. The good results demonstrated their potential in separation of His-rich proteins.
    J. Mater. Chem. B. 07/2014;
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    ABSTRACT: A novel glutathione (GSH)-silica hybrid monolithic column synthesized via a combination of thiol-ene click reaction and one-pot process was described, where thiol-end GSH organic monomer and 2,2-azobisisobutyronitrile (AIBN) were mixed with hydrolyzed tetramethyloxysilane (TMOS) and γ-methacryloxypropyltrimethoxysilane (γ-MAPS) and then introduced into a fused-silica capillary for simultaneous polycondensation and "thiol-ene" click reaction to form the GSH-silica hybrid monolith. The effects of the molar ratio of TMOS/γ-MAPS, the amount of GSH, and the volume of porogen on the morphology, permeability and pore properties of the prepared GSH-silica hybrid monoliths were studied in detail. A uniform monolithic network with high porosity was obtained. A series of test compounds including alkylbenzenes, amides, and anilines were used to evaluate the retention behaviors of the GSH-silica hybrid monolithic column. The results demonstrated that the prepared GSH-silica hybrid monolith exhibited multiple interactions including hydrophobicity, hydrophilicity, as well as cation exchange interaction. The run-to-run, column-to-column and batch-to-batch reproducibilities of the GSH-silica hybrid monolith for phenols' retention were satisfactory with the relative standard deviations (RSDs) less than 1.3% (n=5), 2.6% (n=3) and 3.2% (n=3), respectively, indicating the effectiveness and practicability of the proposed method. In addition, the GSH-silica hybrid monolith was applied to the separation of nucleotides, peptides and protein tryptic digests, respectively. The successful applications suggested the potential of the GSH-silica hybrid monolith in complex sample analysis.
    Journal of chromatography. A. 06/2014;
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    ABSTRACT: Heavy metal ion pollution poses severe risks in human health and environmental pollutant, because of the likelihood of bioaccumulation and toxicity. Driven by the requirement to monitor trace-level mercury ion (Hg(2+)), herein we construct a new DNA-based sensor for sensitive electrochemical monitoring of Hg(2+) by coupling target-induced formation of gold amalgamation on DNA-based sensing platform with gold amalgamation-catalyzed cycling signal amplification strategy. The sensor was simply prepared by covalent conjugation of aminated poly-T(25) oligonucleotide onto the glassy carbon electrode by typical carbodiimide coupling. Upon introduction of target analyte, Hg(2+) ion was intercalated into the DNA polyion complex membrane based on T-Hg(2+)-T coordination chemistry. The chelated Hg(2+) ion could induce the formation of gold amalgamation, which could catalyze the p-nitrophenol with the aid of NaBH4 and Ru(NH3)6(3+) for cycling signal amplification. Experimental results indicated that the electronic signal of our system increased with the increasing Hg(2+) level in the sample, and has a detection limit of 0.02nM with a dynamic range of up to 1000nM Hg(2+). The strategy afforded exquisite selectivity for Hg(2+) against other environmentally related metal ions. In addition, the methodology was evaluated for the analysis of Hg(2+) in spiked tap-water samples, and the recovery was 87.9-113.8%.
    Analytica chimica acta 01/2014; 810C:10-16. · 4.31 Impact Factor
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    ABSTRACT: A molecularly imprinted inorganic-organic hybrid monolithic capillary column (MIP hybrid monolith) was synthesized by one-pot process and its application in selective recognition and capture of lysozyme (Lyz) from complex biological samples was described for the first time. Due to a combination of rigid silica matrices and flexible organic hydrogels in one-pot process, stable and accessible recognition sites in the as-prepared MIP hybrid monolith could be obtained after the removal of template protein, which facilitated the rebinding of template and provided good reproducibility and lifetime of use. The morphology, permeability, and pore properties of the as-prepared MIP hybrid monolith were characterized and a uniform monolithic matrix with high surface area and large through-pores was observed. The recognition behavior of MIP and non-imprinted (NIP) hybrid monolith was evaluated by separating template protein from unfractionated protein mixture and the result indicated that the MIP hybrid monolith has much higher affinity toward the template protein than NIP hybrid monolith. High imprinted factor (IF) and separation efficiency could be obtained. In addition, the practicality of the Lyz-MIP hybrid monolith was further evaluated by selective separation of Lyz from egg white and capture of Lyz from human serum by adopting it as an in-tube solid phase microextraction (in-tube SPME), and the good results demonstrated its potential in proteome analysis.
    Journal of Chromatography A 02/2013; · 4.61 Impact Factor
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    ABSTRACT: A polar polymethacrylate-based monolithic column was introduced and evaluated as a hydrophilic interaction capillary electrochromatography (HI-CEC) stationary phase. The monolithic stationary phase was prepared by in situ copolymerization of a neutral monomer 2-hydroxyethyl methacrylate (HEMA) and a polar cross-linker N,N'-Methylene bisacrylamide (MBAA) in a binary porogenic solvent consisting of dodecyl alcohol and toluene. The hydroxyl and amino groups at the surface of the monolithic stationary phase provided polar sites which were responsible for hydrophilic interactions. The composition and proportion of the polymerization mixture was investigated in detail. The mechanical stability and reproducibility of the obtained monolithic column preformed was satisfied. The effects of pH and organic solvent content on the EOF and the separation of amines, nucleosides and narcotics on the optimized monolithic column were investigated. A typical HI-CEC was observed on the neutral polar stationary phase. The optimized monolithic column can obtain high column efficiencies with 62 000-126 000 theoretical plates/m and the RSDs of column-to-column (n = 9), run-to-run (n = 5) and day-to-day (n = 3) reproducibility were less than 6.3%. The calibration curves of these five narcotics exhibited good linearity with R in the range of 0.9959-0.9970 and linear ranges of 1.0 to 200.0 μg/mL. The detection limits at S/N = 3 were between 0.2 and 1.2 μg/mL. The recoveries of the separation of narcotics on the column were in the range of 84.0-108.6%. The good mechanical stability, reproducibility and quantitation capacity was suitable for pressure-assisted CEC (pCEC) applications.
    Electrophoresis 02/2013; · 3.26 Impact Factor
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    ABSTRACT: Field amplified sample stacking (FASS) was combined with a simple, rapid, sensitive CE-ESI-MS method to achieve the on-line enrichment and simultaneous determination of Clenbuterol (CLE), Salbutamol (SAL), Terbutaline (TER) and Formoterol (FOR). Samples were diluted in deionized water, and electrokinetic injection (10kV×50s) was employed to carry out FASS. With FASS, the four β2-agonists had simultaneously baseline enhancement as much as 319, 332, 297 and 115 fold, respectively. Consequently, satisfactory LODs (S/N=3) of 0.08, 0.1, 0.1 and 0.5ng/mL for CLE, SAL, TER and FOR were obtained. The separation of the four analytes was performed at 22kV in ammonium acetate/ammonia (20mmol/L, pH 9.0), using 7.5mmol/L acetic acid in isopropanol/water 50/50% (v/v) as sheath liquid. In addition, an excellent linear response was obtained with RSD less than 1.3% for migration times and less than 6.7% for peak areas (n=5). The recoveries of spiked urine samples were in the range of 82.7-101% with RSD lower than 9.8%. The proposed method has been applied to analyze human urine samples successfully.
    Talanta 01/2013; 104C:97-102. · 3.50 Impact Factor
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    ABSTRACT: A novel highly sensitive and selective electrochemical sensing system based on DNAzyme and rolling circle amplification (RCA) for the determination of Pb(2+) was developed in the present study. Firstly, the DNAzyme catalytic strands were immobilized onto magnetic beads surface and then hybridized with substrate strands. In the presence of Pb(2+), the DNAzyme could be activated to cleave the substrate strand into two DNA fragments. After RCA reaction, a long ssDNA product with repeating sequence was obtained. Subsequently, CdS QDs modified ssDNA (CdS QD-ssDNA) were used as signaling probes to hybridize with the long ssDNA product. Due to the dramatic signal amplification by the numerous QDs and the low background signal by magnetic separation, ultra-low level (7.8pM) of Pb(2+) could be detected. Furthermore, with the application of Pb(2+) dependent DNAzyme, the proposed sensing system exhibited high selectivity. The proposed sensing system showed a promising potential for on-site testing and would gain wide applications in real sample analysis.
    Biosensors & bioelectronics 10/2012; 42C:608-611. · 5.43 Impact Factor
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    ABSTRACT: A novel three-way junction DNAzyme based probe has been designed for the colorimetric sensing of target DNA. Specifically, a DNAzyme-linked hairpin DNA is used as a signal probe. In the presence of target DNA, the signal probe, assistant probe and target DNA can hybridize with each other, resulting in the formation of a three-way junction DNA. At the same time, the signal probe is opened and the DNAzyme sequence in the signal probe is dehybridized. Subsequently, in the presence of hemin, the DNAzyme sequence forms a G-quadruplex-hemin complex, which catalyzes oxidation of 2, 2'-azinobis (3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) by H(2)O(2) to the colored ABTS(.-)radical. The significant color changes can be distinguished visually. By the combination of the hairpin probe and the three-way junction DNA probe, the proposed sensor exhibits high recognition property for single-nucleotide polymorphisms (SNPs). This sensor allows the detection of target DNA at a concentration as low as 0.25nmol L(-1). The proposed sensor is easy to fabricate, which avoids the tedious and expensive labeling procedures, and exhibits high selectivity against single-base mismatched DNA.
    Biosensors & bioelectronics 09/2012; · 5.43 Impact Factor
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    ABSTRACT: Aminophenylboronic acid (APBA)-functionalized magnetic iron oxide nanoparticles (Fe 3 O 4 MNPs) were synthesized for the selective capture of glycoproteins from unfractionated protein mixtures. The morphology, adsorption, and recognition properties of the resultant particles were investigated and uniform size APBA-coated MNPs with a mean diameter of $15 nm and high magnetic saturation value of 30.6 emu g À1 were obtained, which endued the adsorbent with a large surface area and convenience of isolation. The selectivity and binding capacity of APBA-coated MNPs were evaluated by using standard glycoproteins (cellulose and ovalbumin) and nonglycoproteins (bovine hemoglobin, bovine serum albumin and lysozyme) as model samples. Adsorption experiments and SDS-PAGE demonstrated that the APBA-coated MNPs had higher binding capacity and selectivity for glycoproteins compared to nonglycoproteins. In addition, the practicability of the as-prepared MNPs was further assessed by specific capture of ovalbumin from an egg white sample.
    Journal of Materials Chemistry 11/2011; · 5.97 Impact Factor
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    ABSTRACT: An inorganic-organic hybrid affinity monolithic column was synthesized by a novel "one-pot" approach. The resulting hybrid affinity monoliths have potential applications in specific recognition and enrichment of glycoproteins.
    Chemical Communications 09/2011; 47(34):9675-7. · 6.38 Impact Factor
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    ABSTRACT: A phenylboronate affinity monolith was prepared and applied to the selective capture of glycoproteins from unfractionated protein mixtures. The monolith was synthesized in a 100 μm i.d capillary by an in situ polymerization procedure using a pre-polymerization mixture consisting of 4-vinylphenylboronic acid (VPBA) as functional monomer, ethylene dimethacrylate (EDMA) as crosslinker, diethylene glycol and ethylene glycol as binary porogenic solvents, and azobisisobutyronitrile (AIBN) as initiator. The prepared monolith was characterized in terms of the morphology, pore property, and recognition property. The selectivity and dynamic binding capacity were evaluated by using standard glycoproteins and nonglycoproteins as model proteins. The chromatographic results demonstrated that the phenylboronate affinity monolith had higher selectivity and binding capacity for glycoprotein than nonglycoprotein. The resulting phenylboronate affinity monolith was used as the sorbent for in-tube solid phase microextraction (in-tube SPME), and the extraction performance of the monolith was assessed by capture of ovalbumin from egg white sample.
    The Analyst 08/2011; 136(16):3281-8. · 4.23 Impact Factor
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    ABSTRACT: A new "signal-on" aptasensor for ultrasensitive detection of Ochratoxin A (OTA) in wheat starch was developed based on exonuclease-catalyzed target recycling. To construct the aptasensor, a ferrocene (Fc) labeled probe DNA (S1) was immobilized on a gold electrode (GE) via Au-S bonding for the following hybridization with the complementary OTA aptamer, with the labeled Fc on S1 far from the GE surface. In the presence of analyte OTA, the formation of aptamer-OTA complex would result in not only the dissociation of aptamer from the double-strand DNA but also the transformation of the probe DNA into a hairpin structure. Subsequently, the OTA could be liberated from the aptamer-OTA complex for analyte recycling due to the employment of exonuclease, which is a single-stranded DNA specific exonuclease to selectively digest the appointed DNA (aptamer). Owing to the labeled Fc in close proximity to the electrode surface caused by the formation of the hairpin DNA and to the analyte recycling, differential pulse voltammetry (DPV) signal could be produced with enhanced signal amplification. Based on this strategy, an ultrasensitive aptasensor for the detection of OTA could be exhibited with a wide linear range of 0.005-10.0ngmL(-1) with a low detection limit (LOD) of 1.0pgmL(-1) OTA (at 3σ). The fabricated biosensor was then applied for the measurement of OTA in real wheat starch sample and validated by ELISA method.
    Biosensors & bioelectronics 08/2011; 29(1):97-101. · 5.43 Impact Factor
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    ABSTRACT: A simple, sensitive and reproducible method using microemulsion electrokinetic chromatography (MEEKC)-field amplified sample injection (FASI) was developed for the analysis of nine narcotics (morphine, codeine, naloxone, heroin, thebaine, cocaine, pethidine, fentanyl and methadone) in urine. In the MEEKC method, sodium dodecyl sulfate (SDS), 1-butanol and ethyl acetate were used as surfactant, co-surfactant and organic solvent, respectively. The effects of the acidity and concentration of borate buffer, SDS, 1-butanol and ethyl acetate contents were investigated. The optimum concentrations (by mass fraction) of microemulsion system were 0.6% SDS, 1.2% 1-butanol, 0.6% ethyl acetate and 97.6% 10 mmol/L Na2B4O7 buffer (pH 9.5). The applied voltage was 25 kV. FASI was coupled with the MEEKC method to increase the sensitivity. Under the optimum conditions, the nine narcotics were baseline separated within 15 min and the detection limits (S/N = 3) were in the range of 0.3 - 8.0 microg/L. The spiked recoveries in urine samples were between 79.4% and 119.9% with the intraday relative standard deviations (RSDs) less than 5.5%. The developed method has been successfully applied to the analysis of methadone in the samples from in vitro metabolism study.
    Se pu = Chinese journal of chromatography / Zhongguo hua xue hui 08/2011; 29(8):791-7.
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    ABSTRACT: In this paper, we developed a simple and effective on-line focusing technique combining dynamic pH junction and sweeping by capillary electrophoresis (CE) with laser-induced fluorescence (LIF) detection. Dynamic pH junction-sweeping is defined when the sample has a different buffer pH (dynamic pH junction condition) and is devoid of micelles (sweeping condition) relative to the background electrolyte (BGE). This hyphenated focusing mode was applied to the sensitive and selective focusing of four dipeptides: Tyr-Phe, Tyr-Leu, Trp-Gly, and Ala-Gln. Picomolar detectability of these dipeptides by CE-LIF detection was demonstrated through effective focusing of large sample volumes (up to 39% capillary length) using the dual pH junction-sweeping focusing mode. 25 mmol L(-1) sodium dihydrogen phosphate, pH 2.5 was used as the sample matrix, and 100 mmol L(-1) borate, 21 mmol L(-1) sodium dodecylsulfate (SDS), 16 mmol L(-1) Brij35, pH 9.0 as the background solution (BGS). The concentration detection limits (S/N = 3) of the four dipeptides were in the range of 1.0-5.0 pmol L(-1). The developed method has been successfully used for the determination of dipeptides in human serum samples.
    The Analyst 03/2011; 136(9):1852-8. · 4.23 Impact Factor
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    ABSTRACT: A simple, rapid and sensitive CE-ESI-MS method for the simultaneous analysis of seven stimulants and narcotics (amphetamine, ephedrine, methadone, pethidine, tetracaine, codeine and heroin) was developed. The CE-ESI-MS experimental conditions were optimized as follows: 20 mmol/L ammonium acetate with pH 9.0 as running buffer, the separation voltage of 22 kV and the sheath liquid of isopropanol/water (1:1 v/v) containing 7.5 mmol/L acetic acid with 3.0 μL/min flow rate. Under the optimized conditions, the stimulants and narcotics were well separated within 4.6 min using a 70-cm length fused-silica capillary (50 μm id). The detection limits (S/N=3) of the CE-ESI-MS analysis were in the range of 0.40-1.0 ng/mL. Method repeatability of intra-day and inter-day was satisfactory. The recoveries obtained from the analysis of spiked urine samples were between 84.1 and 108%. The developed method was successfully applied for the simultaneous analysis of methadone, pethidine and codeine and their in vitro metabolites.
    Electrophoresis 02/2011; 32(3-4):472-8. · 3.26 Impact Factor
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    ABSTRACT: A novel method using microemulsion electrokinetic chromatography combining accelerated solvent extraction was developed for quantitative analysis of six phthalate esters (PAEs) including dimethyl phthalate, diethyl phthalate, dibutyl phthalate, benzyl butyl phthalate, bis(2-ethylhexyl) phthalate, as well as dioctyl phthalate. The effect of each individual component within the microemulsions, i.e. oil phase, surfactant and co-surfactant on resolution of the analytes was systematically studied. Baseline separation of six PAEs was achieved within 26 min by using the microemulsion buffer containing a 60 mmol/L borate buffer at pH 9.0, 0.5% v/v n-octane as oil droplets, 100 mmol/L sodium cholate as surfactant and 5.0% v/v 1-butanol as co-surfactant. The purposed accelerated solvent extraction-microemulsion electrokinetic chromatography method was successfully applied to the determination of trace amount of PAEs in soil samples collected from three different fields in areas of Fujian Province and the contents of dimethyl phthalate, diethyl phthalate, dibutyl phthalate, benzyl butyl phthalate, bis(2-ethylhexyl) phthalate and dioctyl phthalate were 0.63-0.68, 0.32-0.63, 2.53-3.96, 0-1.75, 7.32-11.7 and 0-3.46mg/kg, respectively. It was validated that the results were consistent with those obtained by GC-MS method.
    Journal of Separation Science 11/2010; 33(23-24):3717-25. · 2.59 Impact Factor
  • Lijun Qiu, Wei Liu, Min Huang, Lan Zhang
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    ABSTRACT: A relatively selective, chemically and physically robust SPME fiber was developed in a simple way with testosterone-imprinted polymer, and then directly coupled with gas chromatography-mass spectrometry (GC-MS) for selective extraction and analysis of anabolic steroids. The factors influencing polymerization (i.e., cross-linker, polymerization solvent, polymerization time) were optimized in detail and the polymer was characterized by scanning electron microscope, infrared spectrometer and thermogravimetric analyzer. Furthermore, the extraction performance of the MIP-coated SPME fibers such as extraction ability and selectivity was evaluated. Moreover, the interaction mode between target analytes and fiber coating was deducted. Finally, the method for extraction and determination of androsterone, stanolone, androstenedione and methyltestosterone by the homemade MIP-coated SPME fibers with GC-MS was obtained. It was applied to the simultaneous analysis of four anabolic steroids in the spiked human urine with the satisfactory recoveries.
    Journal of Chromatography A 10/2010; 1217(48):7461-70. · 4.61 Impact Factor
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    ABSTRACT: Domoic acid (DA), a neurotoxic amino acid produced by some strains of phytoplankton, is responsible for the human toxic syndrome amnesic shellfish poisoning. This exocitotoxin results in neuronal degeneration and necrosis in specific regions of the hippocampus. Because DA accumulates mostly in shellfish, causing outbreaks in different countries, screening for DA has been carried out with various assays. Although bioassays and immunoassays have been developed, several liquid chromatographic methods for the determination of DA in different matrices such as shellfish, algae, or seawater have been reported. Additionally, other alternative methods such as capillary electrophoresis and capillary electrochromatography have been described. This paper summaries the toxicology, the chemistry, and the developed determination methods of DA.
    Journal of Agricultural and Food Chemistry 10/2010; 58(22):11525-33. · 3.11 Impact Factor
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    ABSTRACT: An improved route to obtain ZnO nanotube arrays and its first application to headspace solid-phase microextraction (HSSPME) as an adsorptive coating were described. The ZnO nanotube arrays were synthesized by a two-step chemical process including the hydrothermal synthesis of ZnO nanorod arrays on the surface of silica fiber (SiO(2)) in the first step, and the formation of ZnO nanotubes by selectively etching in NH(3)·H(2)O solution in the second step. The influence of NH(3)·H(2)O concentration, etching time, reaction temperature, and aging time in the ZnO nanotubes formation process was investigated, and arrays of ZnO nanotube with tailored dimensions (250 nm external diameters, 70 nm wall thicknesses and 2 μm lengths) could be obtained by varying the conditions. In addition, the feasibility of ZnO nanotube arrays adopted for HSSPME was evaluated by extracting volatile organic compounds (VOCs) by use of benzene, toluene, ethylbenzene, o-, m-and p-xylene (BTEX) as model compounds and the results showed that the coating has good extraction capability. The analytes were linear in the range of 10-600 μg L(-1) (r > 0.9960) and the detection limits were about 0.005-0.01 μg L(-1), lower than that obtained with ZnO nanorod arrays. The relative standard derivations (RSD) for the repeatability of single fiber and fiber-to-fiber were lower than 9.5% and 13.8%, respectively. The prepared coating showed good recoveries in the range of 87%-108% and long lifetime (more than 50 times), implying to be a potential absorbent for the VOCs in water samples.
    The Analyst 10/2010; 135(10):2694-9. · 4.23 Impact Factor
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    ABSTRACT: Monoclinic structured spindly bismuth vanadate microtubes were fabricated on a large scale by a simple ionothermal treatment in the environment-friendly green solvent of urea/choline chloride. The as-prepared samples were characterized by XRD, SEM, TEM, IR and their photocatalytic activity was evaluated by photocatalytic decolorization of rhodamine B aqueous solution under visible-light irradiation. As-obtained BiVO(4) microtubes exhibit the spindly shape with a side length of ca. 800 nm and a wall thickness of ca. 100 nm. The opening of these microtubes presents a saw-toothed structure, which is seldom in other tube-shaped materials. The formation mechanism of the spindly microtubes is ascribed to the complex cooperation of the reaction-crystallization process controlled by BiOCl and the nucleation-growth process of nanosheets induced by solvent molecules attached on the surface of microtubes. Such spindly microtubes exhibit much higher visible-light photocatalytic activity than that of bulk BiVO(4) prepared by solid-state reaction, possibly resulting from their large surface area and improved crystallinity.
    Journal of hazardous materials 09/2010; 181(1-3):1102-8. · 4.14 Impact Factor

Publication Stats

483 Citations
238.42 Total Impact Points

Institutions

  • 2001–2013
    • Fuzhou University
      • • Department of Chemical Engineering
      • • Department of Chemistry
      Min-hou, Fujian, China
  • 2008–2010
    • Ocean University of China
      • Department of Materials Science and Engineering
      Qingdao, Shandong Sheng, China
  • 1999–2001
    • East China Normal University
      • Department of Chemistry
      Shanghai, Shanghai Shi, China