Huizhou Liu

Chinese Academy of Sciences, Peping, Beijing, China

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Publications (175)281.91 Total impact

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    ABSTRACT: BACKGROUND Adsorption is believed to be an effective and green technology for the removal and recovery of rare earths (III) from dilute solution.RESULTSA novel hybrid gel, abbreviated as ALG-PGA, has been prepared through crosslinking calcium alginate (ALG) and γ-poly glutamic acid (PGA), and its adsorption behavior towards whole rare earths (III) has been examined. Taking Nd(III) as a representative element, the adsorption capacity, kinetics, reusability, selectivity and mechanism have been investigated. Cation exchange is proposed as a possible adsorption mechanism. Doping PGA molecules into calcium alginate beads can significantly enhance the adsorption capacity and the selectivity of rare earths from non-rare earths. The maximum adsorption capacity obtained for Nd(III) was 1.65 mmol g−1. Reutilization of ALG-PGA gel was confirmed for up to eight consecutive sorption–desorption cycles with no damage to the gel.CONCLUSION The prepared biosorbent, ALG-PGA, was biocompatible and cost effective with a good adsorption ability for Nd(III), and provides a new approach to the recovery of rare earths (III) from rare earths-containing wastewater. © 2013 Society of Chemical Industry
    Journal of Chemical Technology & Biotechnology 07/2014; 89(7). · 2.50 Impact Factor
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    ABSTRACT: SignificanceBubbles can be used to greatly improve the speed of magnetic separation and overcome the limitation of magnetic force on the capture distance, making low-field magnetic separation highly efficient and easily scalable. This novel method leads to the development of a medium-free continuous gas-assisted magnetic separator on small pilot scale using low-field permanent magnet. This separator is demonstrated highly efficient for recovery of proteins-loaded magnetic nanoparticles from large volume bio-suspension. © 2014 American Institute of Chemical Engineers AIChE J, 2014
    AIChE Journal 06/2014; · 2.58 Impact Factor
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    ABSTRACT: Dried orange juice residue marketed as cattle food was converted into an economical and environmentally benign sorbent through chemical loading with zirconium(IV). Its adsorption properties for vanadium(V) and chromium(VI) from synthetic and actual waste water were investigated. The adsorption of V(V) is strongly dependent on solution pH, and the maximum separation coefficient (bV/Cr = 45) between V(V) and Cr(VI) takes place at pH 2.85. The anion exchange or nucleophilic substitution reaction between OH� and metal oxo-anions was proposed as the main adsorption mechanism. Langmuir adsorption and pseudo-second-order rate equations can describe well the adsorption of V(V) onto the gel. The maximum adsorption capacities for V(V) and Cr(VI) were estimated as 1.003 and 0.288 mmol/g, respectively. The adsorbed vanadium was effectively desorbed using a diluted NaOH solution. The negligible interference of coexisting anions, such as nitrates and chlorides, durability, reproducibility of the gel, and the column adsorption test through the mixture of V(V) and Cr(VI) followed by elution make the Zr(IV)-SOW a promising sorbent for the recovery of a small quantity of vanadium from chromium(VI)- containing effluent. Finally, a preliminary attempt to selectively enrich V(V) from the real dilute industrial effluent that contains Cr(VI) using the present gel has been carried out, and it was confirmed to be successfully achieved.
    Chemical Engineering Journal 03/2014; 248:79-88. · 3.47 Impact Factor
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    ABSTRACT: The present study prepared a size-controllable, uniform, and surfactant-free emulsification to investigate the zeta potential (ζ potential) of the solvent effect. The results showed that the ratio of electrophoretic mobility changed with droplet diameter, and the correct factor of the ζ potential was determined. The effect of functional groups on the ζ potential was further studied in the presence of an organic hydrophilic solvent. The study characterized the effects of pH, ionic strength, and ionic type on the ζ potential and indicated that the solvents were able to modulate the local electrochemical environment, thus leading to the redistribution of interface charges.
    Langmuir 02/2014; · 4.38 Impact Factor
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    Xuetuan Wei, Mingfang Luo, Huizhou Liu
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    ABSTRACT: The bifunctional coating with antithrombotic and antimicrobial activity was developed using nattokinase (NK) and nanosilver (AgNPs). Firstly, the adsorption interactions between NK and AgNPs were confirmed, and the composite particles of NK-AgNPs were prepared by adsorption of NK with AgNPs. At 5FU/mL of NK concentration, the saturation adsorption capacity reached 24.35FU/mg AgNPs with a high activity recovery of 97%, and adsorption by AgNPs also enhanced the heat stability and anticoagulant effect of NK. Based on the electrostatic force driven layer-by-layer self-assembly, the NK-AgNPs were further assembled with polyethylenimine (PEI) to form coating. UV-vis analysis showed that the self-assembly process was regular, and atom force microscopy analysis indicated that NK-AgNPs were uniformly embedded into the coating. The NK-AgNPs-PEI composite coating showed potent antithrombotic activity and antibacterial activity. This study developed a novel strategy to construct the bifunctional coating with antithrombotic and antimicrobial properties, and the coating material showed promising potential to be applied in the medical device.
    Colloids and surfaces B: Biointerfaces 01/2014; 116C:418-423. · 3.55 Impact Factor
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    ABSTRACT: Neutral organophosphates have been used for the extraction and separation of rare earths, usually with the addition of an extra salting-out reagent to achieve the necessary high ionic strength. In this work, we propose a novel approach to extraction from rare earth solutions with fairly high concentrations without an extra salting-out reagent. The distribution behaviors of La, Pr, and Nd in a nitrate solution extracted with di-(2-ethylhexyl) 2-ethylhexyl phosphonate (DEHEHP) in kerosene under the action of a self-salting-out effect were investigated, including the extraction mechanism, extracted species, extraction isotherms, and effects of acidity and temperature. The obtained results show that the extraction species probably is RE(NO3)3·1.5DEHEHP according to the slope analysis method and the saturation extraction method. Considering the other coexisting light rare earths, such as Ce and Sm, the separation factors were also examined through a comparison of the two commercial extractants P350 and TBP. The extraction selectivity for DEHEHP under the action of the self-salting-out effect is much higher than that of TBP but just slightly below that of P350. Finally, it can be concluded that the current system using DEHEHP as an extractant under the action of the self-salting-out effect shows good prospects for the purification of La from other light rare earths.
    Industrial & Engineering Chemistry Research. 01/2014; 53(4):1598–1605.
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    ABSTRACT: Graphical abstract Three-liquid-phase systems for removal of Al, Fe, Si and separation from rare earths (HREs-heavy rare earths, MREs-middle rare earths, LREs-light rare earths).
    Separation and Purification Technology 01/2014; 127:97–106. · 2.89 Impact Factor
  • Separation and Purification Technology 01/2014; 131:94–101. · 2.89 Impact Factor
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    ABSTRACT: We explore whether it is possible to use 2D correlation spectrum to characterize intermolecular interactions between two solutes dissolved in the same solution when one substance does not possesses any characteristic peak. We demonstrate that the interaction can be manifested by characteristic cross peaks in 2D asynchronous correlated spectrum. The above cross peaks reflect the subtle spectral variations on the characteristic peak of another solute under intermolecular interaction. On the other hand, 2D synchronous spectrum is not suitable to characterize intermolecular interaction since the cross peaks contain irremovable interfering parts. The terbium-chloride/benzamide/methanol system is used to demonstrate that this approach is applicable in the real chemical system.
    Journal of Molecular Structure. 01/2014; 1069:127–132.
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    ABSTRACT: A novel amino-functionalized magnetic cellulose composite was prepared by a process involving: (1) synthesis of magnetic silica nanoparticles using the co-precipitation method followed by the hydrolysis of sodium silicate, (2) coating with cellulose through the regeneration of cellulose dissolved in 7 wt% NaOH/12 wt% urea aqueous solvent, (3) grafting of glycidyl methacrylate using cerium initiated polymerization and (4) ring-opening reaction of epoxy groups with ethylenediamine to yield amino groups. Once generated, the resulting composite was tested for its ability to remove Cr(VI) from an aqueous solution in batch experiments. The results demonstrated that Cr(VI) adsorption was highly pH dependent. The optimized pH value was 2.0. The adsorption isotherms of the adsorbent fit the Langmuir model, with the maximum adsorption capacity of 171.5 mg/g at 25 °C. The adsorption rate was considerably fast, and the adsorption reached equilibrium within 10 min. The obtained thermodynamic parameters showed that the adsorption of Cr(VI) onto the adsorbent was an exothermic and spontaneous process. In addition, the Cr(VI) ions could be effectively desorbed using a 0.1 mol/L NaOH solution and the adsorbent exhibited a good reusability. The composite material should be a promising adsorbent for Cr(VI) removal, with the advantages of high adsorption capacity, rapid adsorption rate and convenient recovery under magnetic field.
    Chemical Engineering Journal. 01/2014; 241:175–183.
  • Colloids and Surfaces A Physicochemical and Engineering Aspects 01/2014; 457:160–168. · 2.11 Impact Factor
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    ABSTRACT: Gas-assisted three-liquid-phase extraction (GATE), which has the advantages of both three-liquid-phase extraction and solvent sublation, is a novel separation technique for separation and concentration of two organic compounds into different phases in one step. This highly effective and economically applicable method has been developed for separating emodin and rhein from herbal extract. In a GATE system composed of butyl acetate/PEG4000/ammonium sulphate aqueous solution, influence of various parameters including gas flow rate, flotation time, salt concentration, initial volume of PEG and butyl acetate were investigated. Within 50 min of 30 ml · min− 1 nitrogen flow, removal ratio of emodin and rhein from aqueous phase could be over 99% and 97%, respectively. Mass fraction of emodin in the BA phase and rhein in the PEG phase could reach 97% and 95%, respectively. It is demonstrated that gas bubbling is effective for partitioning of emodin and rhein into butyl acetate and PEG phase respectively, and dispersed PEG and butyl acetate could be captured in the aqueous solution. Experimental results show that GATE could be an effective and economical technology for concentration and separation of co-existed products in medicinal plants. Graphic abstract The figure is schematic diagram of gas-assisted three-liquid-phase extraction system. The flotation column is made of glass, is equipped with a G4 sintered glass sparger (pore size 3-4 μm). The inner diameter of the column is 36 mm and the length is 450 mm. There are three coexisting phases in the column, i.e. organic phase, polymer phase and aqueous phase (containing ammonium sulphate solution and simulated herbal exact). Three ports are open at different parts along the column to obtain samples of the three phases. In the process of gas bubbling, emodin and rhein initially contained in the aqueous phase are extracted into organic phase and polymer phase, respectively.
    Chinese Journal of Chemical Engineering. 01/2014;
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    ABSTRACT: In this study, gas-assisted superparamagnetic extraction (GASE) with potential large-scale application was proposed for selective separation of multicomponent proteins. Magnetic poly(glycidyl methacrylate)–iminodiacetic acid–Zn2+ microspheres (MPMs) for selective separation of bovine serum albumin (BSA) and bovine hemoglobin (BHb) are selected as a model. The feasibility of flotation for concentrating BHb-loaded MPMs from dilute mixed proteins solution was proved. The well-concentrated solution of BHb-loaded MPMs could be achieved by simple adjustment of pH values and ionic strength in low regions, without additive detergent. Impurity BSA had the effects of improving the flotability of BHb-loaded MPMs, acting as foaming agent, but decreasing the enrichment ratio in the GASE process. The flotation conditions and the selective adsorption ones showed strong consistency. Under the optimal conditions, the enrichment ratio of 39 and recovery percentage of 98% was obtained within 1.3 min. Furthermore, the enrichment ratio could be further improved by added flotation steps.
    Industrial & Engineering Chemistry Research. 11/2013; 52(46):16314–16320.
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    ABSTRACT: The present work puts forward a new strategy to achieve group separation of light, middle, and heavy rare-earth ions by liquid–liquid–liquid three-phase systems. Experimental results indicated that heavy rare-earth ion, Yb(III), can be selectively extracted into the organic top phase, while middle rare-earth ion, Eu(III), and light rare-earth ion, La(III), can be enriched, respectively, into PEG-rich middle phase and (NH4)2SO4-rich bottom aqueous phase of Cyanex272/PEG/(NH4)2SO4–H2O three-liquid-phase system. Various influences of aqueous pH, (NH4)2SO4 concentrations, complexing agents, polymers, and their added amount on three-liquid-phase separation of La, Eu, and Yb were investigated. Besides, a possible partitioning mechanism for three rare-earth ions was discussed. The present work highlights the possibility of employing the discrepancy in selective partitioning behaviors of different rare-earth ions (such as La, Ce, Eu, Gd, Yb, and Lu) into different liquid layers of three-liquid-phase system to achieve one-step group separation of light, middle, and heavy rare-earth ions. In comparison with traditional organic-aqueous biphasic extraction for group separation of rare-earth ions, which require multiple steps of pH adjustments and repeated separation, the three-liquid-phase approach exhibits obvious advantages for future industrial application.
    Industrial & Engineering Chemistry Research. 04/2013; 52(17):5997–6008.
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    ABSTRACT: A novel strain of Bacillus licheniformis P-104 was isolated from Chinese soybean paste to produce a bioflocculant. The bioflocculant was confirmed as ultra-high molecular weight poly-γ-glutamic acid (γ-PGA) using Fourier transform infrared spectrum, high-performance liquid chromatography, and gel permeation chromatography with multi-angle laser light scattering. The production technology and flocculation properties of γ-PGA were investigated. By fed-batch fermentation in a 7-L bioreactor, the maximum γ-PGA yield reached 41.6 g L(-1) with a productivity rate of 1.07 g L(-1) h(-1). The flocculating activity of γ-PGA for kaolin suspension was 33.5 ± 1.6 1/OD under the optimized flocculation conditions (6 mM Ca(2+), 1.5 mg L(-1) γ-PGA, and pH 6.0). The optimized dosage of γ-PGA for flocculation was just about 30 % of that of reported γ-PGA produced by other strains. Moreover, the flocculation activity of γ-PGA produced by strain P-104 was much higher than commercial γ-PGA with the molecular weight ranging 200-500 kDa and 1,500-2,500 kDa. This study provided a promising strain and an efficient method for production of ultra-high molecular weight γ-PGA which could be used as a potential green bioflocculant.
    Applied biochemistry and biotechnology 04/2013; · 1.94 Impact Factor
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    ABSTRACT: Novel alginate hybrid beads were prepared by doping with silica (abbreviated as ALG/SiO2), and their adsorption behavior toward rare earths(III) had been investigated. For the whole lanthanides, it exhibits a distinct “tetrad effect” with increasing atomic number. Taking Nd as an example, the effects of the pH, adsorption kinetics, isotherms, and regeneration of adsorbents had been studied systematically. Doped SiO2 can enhance the mechanical strength of the beads, and the hybrid adsorbents show no observable swelling during the adsorption process. It is interesting to note that NdIII adsorption can be improved about 0.1 mmol/g after the first cycle and shows no apparent decline until the 12th cycle. Finally, it can be concluded that ALG/SiO2 is superior to the other hybrid alginate adsorbents for the adsorption of rare earths.
    Industrial & Engineering Chemistry Research. 02/2013; 52(9):3453–3461.
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    ABSTRACT: BACKGROUND: The recovery of neodymium from dilute solutions has become important because of its wide application in industry. This work reports the preparation of novel carboxymethyl chitosan adsorbents entrapped by silica (SiO2/CMCH) and their application for adsorption of neodymium(III) ions from aqueous solution. RESULTS: The effect of the CMCH content, equilibrium pH (pHe), contact time, initial concentrations of Nd(III) and temperature on the adsorption was investigated. The amount of Nd(III) adsorption increases with increasing pHe, which can be explained by the pH-titration curve of CMCH. Temperature has a positive effect on Nd(III) adsorption, and the amount adsorbed is 53.04 mg g−1 dry adsorbent or 434.75 mg g−1 CMCH at 328 K. Adsorption kinetics and isotherm can be described by the pseudo-second-order model and Langmuir equation. Both complexation and ion exchange mechanisms are believed to play an important role in Nd(III) adsorption, and possible coordination between CMCH and Nd(III) is speculated. Complete desorption can be reached when the concentration of HCl is more than 0.1 mol L−1. CONCLUSION: A novel method was developed to prepare SiO2/CMCH adsorbents through a one-step sol-gel strategy. The prepared adsorbents were biocompatible and non-toxic with a good adsorption ability for Nd(III), and could be used for adsorptive recovery of Nd(III) from aqueous solutions. © 2012 Society of Chemical Industry
    Journal of Chemical Technology & Biotechnology 02/2013; 88(2). · 2.50 Impact Factor
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    ABSTRACT: In this paper, a modified reference spectrum is utilized to generate 2D asynchronous spectra constructed by using the AOSD approach that is developed in our previous work. Mathematical analysis suggests that it is possible to enhance the intensity of cross peaks by using the modified reference spectrum. Computer simulation indicates that both intensity of cross peaks and signal-to-noise ratio of 2D spectra are improved significantly by adopting the modified reference spectrum. As a result, 2D asynchronous spectrum can be used to probe weak intermolecular interactions under the influence of spectral noise. Furthermore, experiments on acetonitrile/butanone/CCl4 system demonstrate that intensities and signal-to-noise ratio of cross peaks that reflect intermolecular interactions between acetonitrile and butanone can be enhanced remarkably by using the modified reference spectrum.
    Journal of Molecular Structure 02/2013; 1034:101–111. · 1.40 Impact Factor
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    ABSTRACT: INTRODUCTION: Mogroside V is the main effective ingredient of Siraitia grosvenorii used as a natural sweet food as well as a traditional Chinese medicine. The sample pre-treatment prior to chromatographic analysis requires large amounts of toxic organic solvents and is time consuming. OBJECTIVE: To develop an effective and simple method for extracting and determining mogroside V of Siraitia grosvenorii. METHODS: Mogroside V was extracted and preconcentrated by micelle-mediated cloud-point extraction with nonionic surfactant isotridecyl poly (ethylene glycol) ether (Genapol(®) X-080). The obtained solutions containing mogroside V were analysed by high-performance liquid chromatography (HPLC) with ultraviolet (UV) detection. The chromatographic separation was performed on a C(18) -column using gradient elution with acetonitrile and water at 203 nm. RESULTS: The cloud-point extraction yield was 80.7% while the pre-concentration factor was about 10.8. The limit of detection was 0.75 µg/mL and the limit of quantification was 2 µg/mL. The relative standard deviations for intra- and interday precisions of mogroside V were less than 8.68% and 5.78%, respectively, and the recoveries were between 85.1% and 103.6%. CONCLUSION: The HPLC-UV method based on micelle-mediated cloud-point extraction for determination mogroside V in Siraitia grosvenorii was environmentally friendly, simple and sensitive. Copyright © 2013 John Wiley & Sons, Ltd.
    Phytochemical Analysis 01/2013; · 2.48 Impact Factor
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    ABSTRACT: BACKGROUND Biosynthesis of silver nanoparticles (AgNPs) is considered a green method. Sunlight could induce the synthesis of AgNPs with bacteria and plant biomass, while animal and fungus biomass have not been investigated for synthesis of AgNPs under sunlight radiation. RESULTSUnder 80 000 lx sunlight intensity and 4 mg mL-1 of tryptone solution, the maximum AgNPs yield was obtained after 60 min, and the Ag+ (1 mmol L-1) conversion rate reached 98 ± 2%. Transmission electron microscopy revealed that T-Ag (tryptone-mediated) were circular and oval, with an average diameter of 11.63 ± 4.17 nm, and Y-Ag (yeast extract-mediated) displayed similar shape and size to T-Ag. X-ray diffraction confirmed that T-Ag and Y-Ag were in the form of nanocrystals. As-prepared AgNPs showed obvious antimicrobial activity against B. subtilis and E. coli. Capping with peptides helped to maintain colloidal stability of AgNPs. Without sunlight, AgNPs showed high stability at pH 7–11 due to high ζ-potential values, while the stability was destroyed at pH 4. Further exposure to sunlight for 48 h also resulted in sedimentation of AgNPs. CONCLUSION Sunlight could induce tryptone and yeast extract to synthesize AgNPs, and the stability of AgNPs could be regulated by capping peptides, pH, and sunlight exposure. © 2013 Society of Chemical Industry
    Journal of Chemical Technology & Biotechnology 01/2013; · 2.50 Impact Factor

Publication Stats

1k Citations
281.91 Total Impact Points

Institutions

  • 1999–2014
    • Chinese Academy of Sciences
      • • Key Laboratory of Green Process and Engineering
      • • State Key Laboratory of Biochemical Engineering
      Peping, Beijing, China
  • 2002–2013
    • Northeast Institute of Geography and Agroecology
      • • State Key Laboratory of Biochemical Engineering
      • • Key Laboratory of Green Process and Engineering
      Peping, Beijing, China
  • 2008–2009
    • Beijing University of Chemical Technology
      Peping, Beijing, China
  • 2004
    • Peking University
      • Department of Chemistry
      Beijing, Beijing Shi, China
  • 2001
    • Technical Institute of Physics and Chemistry
      Peping, Beijing, China