Xikui Wang

Qilu University of Technology, Chi-nan-shih, Shandong Sheng, China

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Publications (13)37.73 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Increasing environmental concerns and discharge limitations have imposed additional challenges in industrial cooling water treatment. Increasing research efforts have been directed towards finding economical and environmentally friendly inhibitors. In this study, a novel inhibitor of low phosphorus co-polymer was prepared. The inhibition performance of the novel low phosphorus co-polymer as calcium sulfate dihydrate scale inhibitors, the influence of phosphorus content and viscosity weighted average molecular weight on inhibition were evaluated in simulated cooling water. The results indicate that the optimal preparation conditions of the novel low phosphorus co-polymer for inhibiting calcium sulfate dihydrate were 2.103 of sodium ρ-styrene sulfonate/maleic anhydride ratio, 0.26 of the ratio of hypophosphorous to monomer, and 0.57 of the ratio of hydrogen peroxide to hypophosphorous. The novel low phosphorus co-polymer strongly affected the calcium sulfate dihydrate scale formation, the scale inhibition rate was 94%, and phosphorus content and viscosity weighted average molecular weight also evidently influence the scale inhibition rate to calcium sulfate dehydrate. Scanning electronic microscopy and powder X-ray diffraction investigations reveal that the crystal structure of the calcium sulfate dehydrate is highly modified in the presence of the novel low phosphorus co-polymer.
    Desalination 09/2014; 348:89–93. · 3.04 Impact Factor
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    ABSTRACT: The degradation of reactive brilliant red K-2BP (K-2BP) in aqueous solution using swirling jet-induce cavitation (SJC) combined with Fenton process was studied and an evident synergistic effect was observed. The effects of various operating parameters such as H2O2 and Fe2+ dosage, fluid pressure, pH value and temperature of the solution on the degradation of K-2BP have been investigated. The removal of K-2BP in aqueous solution was increased with increasing of H2O2 and Fe2+ addition. But excess Fe2+ has a negative effect on the removal of K-2BP. It was also found that lower pH, higher temperature, and higher pressure of fluid are favorable for the degradation of K-2BP. The degradation mechanism of K-2BP was also discussed with the change of UV–Vis spectra of K-2BP at different degradation time.
    Separation and Purification Technology 06/2014; 130:1–6. · 2.89 Impact Factor
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    ABSTRACT: The ultrasonic degradation of p-nitrophenol (p-NP) in aqueous solution with CCl4 enhancement was studied. The effects of operating parameters such as CCl4 dosage, ultrasonic power, media temperature, the initial concentration of p-NP and initial pH value of the aqueous solution on the degradation of p-NP were investigated, and the enhancement mechanism of CCl4 for p-NP sonolysis was also discussed. The results showed that the sonochemical degradation of p-NP was obviously enhanced by adding CCl4. It attributed to the increase ·OH radicals concentration in the presence of CCl4 as a hydrogen atom scavenger, and the formation of some oxidizing agents such as free chlorine and chlorine-containing radicals. The degradation of p-NP follows a pseudo-first-order kinetics. The degradation rate of p-NP increased with decreasing the temperature, the initial pH value of the solution and decreasing the initial concentration of p-NP. It was also found that p-NP can be mineralized in this process.
    Ultrasonics Sonochemistry 01/2012; 19(1):32-7. · 3.52 Impact Factor
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    ABSTRACT: The degradation of azo dye direct sky blue 5B by sonication combined with zero-valent iron (US-Fe(0))was investigated and an evident synergistic effect was observed. The synergetic effect is mainly due to the increase of ()OH radical concentration from Fenton's reaction. The ()OH radical concentrations in sole sonication and US-Fe(0) process were detected by using terephthalic acid as a fluorescent probe and found that ()OH radicals were generated continuously during sonication and the production of ()OH radicals in US-Fe(0) process was much higher than that in sole sonication. The degradation of direct sky blue 5B followed a pseudo-first-order kinetics and the degradation rate constants were found to be 0.0206 and 0.169 min(-1) with sole sonication and US-Fe(0) process respectively. It was also found that the degradation ratio of direct sky blue 5B increased with the increase of zero-valent iron dosage and decrease of pH value of the dye aqueous solution. The degradation mechanism of direct sky blue 5B with US-Fe(0) process was discussed by the changes of UV-Vis spectrogram of the dye during degradation. The dramatic changes of UV spectra showed a disappearance of both azo and aromatic groups during the degradation.
    Ultrasonics Sonochemistry 09/2011; 18(5):1091-6. · 3.52 Impact Factor
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    ABSTRACT: The degradation of reactive brilliant red K-2BP (K-2BP) in aqueous solution by using swirling jet-induced cavitation, ultrasonic cavitation, and swirling jet-induced cavitation combined with H(2)O(2), ultrasonic cavitation combined with H(2)O(2) was investigated. An obvious synergetic effect between hydrodynamic cavitation and H(2)O(2) was found and a variety of reaction parameters were investigated for the degradation of K-2BP. It was found that the degradation of K-2BP by hydrodynamic cavitation combined with H(2)O(2) follows a pseudo-first-order kinetics. Higher temperature of medium, higher-pressure of fluid and higher concentration of H(2)O(2) are favorable for the degradation of K-2BP, and lower medium pH, lower initial dye concentrations also favored K-2BP degradation. The degradation mechanism of reactive brilliant red K-2BP also discussed with the UV-Vis spectra of the dye solution at different degradation time.
    Ultrasonics Sonochemistry 03/2011; 18(2):494-500. · 3.52 Impact Factor
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    ABSTRACT: Degradation of ethylenediaminetetraacetic acid (EDTA) in aqueous solution by means of ozonolysis or ozonolysis combined with sonolysis was investigated for a variety of operating conditions. Synergistic effects can be observed when ozonolysis was combined with sonolysis because additional OH was produced. It was found that the degradation of EDTA in aqueous solution follows the pseudo-first-order reaction kinetics and the degradation rate depends on the initial concentration of EDTA, the temperature and the acidity of the aqueous medium. The main degradation products of EDTA, such as amino acid and nitrate were tentatively identified by using GC-MS and ion chromatogram techniques.
    Journal of hazardous materials 11/2009; 176(1-3):333-8. · 4.33 Impact Factor
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    ABSTRACT: The degradation of rhodamine B in aqueous solution by using swirling jet-induced cavitation combined with H(2)O(2) was investigated. It was found that there is an obvious synergetic effect between hydrodynamic cavitation and H(2)O(2) for the degradation of rhodamine B. The effects of various operating parameters such as H(2)O(2) dosage, medium pH, solution temperature, fluid pressure and the dye initial concentration on the degradation of rhodamine B have been studied. It was found that the removal of rhodamine B in aqueous solution was increased with increasing the addition of H(2)O(2) and the fluid pressure, and the removal of rhodamine B was decreased with increasing the medium pH and dye initial concentration. It was also found that the degradation of rhodamine B is dependent on the solution temperature. The removal of rhodamine B increased with increase of temperature from 30 to 50 degrees C, but less degradation ratio is observed at 60 degrees C. The degradation kinetics of rhodamine B in aqueous solution using swirling jet-induced cavitation combined with H(2)O(2) under various operational conditions was also investigated. It was found that the degradation of rhodamine B follows a pseudo-first-order kinetics.
    Journal of hazardous materials 05/2009; 169(1-3):486-91. · 4.33 Impact Factor
  • Weilin Guo, Dongmei Gao, Xikui Wang
    Environmental Engineering Science - ENVIRON ENG SCI. 01/2009; 26(2):327-332.
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    ABSTRACT: The chemical effect of swirling jet-induced cavitation was investigated with the decomposing reaction of rhodamine B in aqueous solution. It was found that rhodamine B in aqueous solution can be degraded with swirling jet-induced cavitation and the degradation can be described by a pseudo-first-order kinetics. The effects of operating conditions such as pressure, temperature, initial concentration of rhodamine B, pH of water on the degradation rate of rhodamine B were discussed. It was found that the degradation rate of rhodamine B increased with increasing pressure and decreased with increasing initial concentration. It was also found that the degradation of rhodamine B was strongly dependent of temperature and pH of aqueous solution. The oxidation efficiency of swirling jet-induced cavitation for rhodamine B degradation was discussed and compared with ultrasonic cavitation. The result indicated that the swirling jet-induced cavitation is more energy efficient as compared to sonochemical cavitation.
    Ultrasonics Sonochemistry 05/2008; 15(4):357-63. · 3.52 Impact Factor
  • Xikui Wang, Yong Zhang
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    ABSTRACT: The degradation of alachlor aqueous solution by using hydrodynamic cavitation was systematically investigated. It was found that alachlor in aqueous solution can be deomposed with swirling jet-induced cavitation. The degradation can be described by a pseudo-first-order kinetics and the degradation rate was found to be 4.90x10(-2)min(-1). The effects of operating parameters such as fluid pressure, solution temperature, initial concentration of alachlor and medium pH on the degradation rates of alachlor were also discussed. The results showed that the degradation rates of alachlor increased with increasing pressure and decreased with increasing initial concentration. An optimum temperature of 40 degrees C existed for the degradation rate of alachlor and the degradation rate was also found to be slightly depend on medium pH. Many degradation products formed during the process, and some of them were qualitatively identified by GC-MS.
    Journal of Hazardous Materials 04/2008; 161(1):202-7. · 4.33 Impact Factor
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    ABSTRACT: Degradation of reactive brilliant red K-BP in aqueous solution by means of ultrasonic cavitation was investigated for a variety of operating conditions. It is found that the degradation of reactive brilliant red K-BP in aqueous solution follows pseudo-first-order reaction kinetics and the degradation rate is dependent on the initial concentration of reactive brilliant red K-BP, the temperature and acidity of the aqueous medium. The effects of Fe2+, Fenton reagent and NaCl addition on the sonochemical degradation of reactive brilliant red K-BP were also investigated. The results obtained here indicate that the degradation rate of brilliant red K-BP in aqueous solution was substantially accelerated by Fe2+, NaCl or Fenton reagent addition.
    Ultrasonics Sonochemistry 02/2008; 15(1):43-8. · 3.52 Impact Factor
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    ABSTRACT: Cationic copolymer latex of vinyl acetate (VA) with methacryloxyethyl trimethylammonium chloride (MTC) and anionic copolymer latex of VA with sodium acrylate (SA) were prepared via emulsifier-free emulsion copolymerization. Modifications of cement mortars by these copolymer latexes were studied, and the results were compared with mortars modified by homopolymer of VA (PVA) as well as with blank mortars. The experimental results showed that flow of the mortars modified by PVA homopolymer and P(VA–MTC) copolymer latexes were increased compared with the blank, whereas a decrease was observed for that modified by P(VA–SA) anionic copolymer latex; a volume expansion was detected in polymer modified mortars by PVA and P(VA–MTC), while no volume expansion was observed in the anionic P(VA–SA) modified mortars; the flexural strength of mortars modified by P(VA–MTC) increased by 79.5% compared to unmodified mortars after 5 day water curing plus 21 day air curing. This value reached 95% when the curing process was followed by a supplementary 24 h vacuum curing. These polymer modified mortars were then subjected to hydration analysis through X-Ray diffraction (XRD). Mechanisms of the mortar modification are discussed based on the characterization results.
    Cement and Concrete Composites. 01/2005; 27:920-925.
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    ABSTRACT: A novel sonochemical method to directly prepare anatase nanocrystalline TiO2 has been established. TiO2 particles were synthesized by the hydrolysis of titanium tetraisopropyl in the presence of water and ethanol under high-intensity ultrasonic irradiation (20 KHz, 100 W/cm2) at 90 °C for 3 h. The product structure and the particle sizes were dependent upon the reaction temperature, the acidity of the medium and the reaction time. Characterization was accomplished using various different techniques, such as powder X-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetry-differential thermal analysis (TG-DTA), and Fourier transform infrared (FT-IR) spectroscopy. The TEM images showed that the particles of TiO2 were columnar in shape and the average sizes were ∼3×7 nm. The formation mechanism of nanocrystalline TiO2 under high-intensity ultrasonic irradiation was also discussed.
    Microelectronic Engineering 01/2003; 66:95-101. · 1.22 Impact Factor

Publication Stats

110 Citations
37.73 Total Impact Points

Institutions

  • 2014
    • Qilu University of Technology
      Chi-nan-shih, Shandong Sheng, China
  • 2003–2012
    • University of Jinan (Jinan, China)
      Chi-nan-shih, Shandong Sheng, China
  • 2008–2009
    • Shandong Polytechnic University
      Chi-nan-shih, Shandong Sheng, China