Papers by Author: Xiao Yan Lin

Abstract: For the problem it is easy for the film to generate fog and drop in greenhouse, Polyethylene/Ethylene Vinyl Acetate (PE/EVA) composite greenhouse film was prepared by co-blending and extrusion. The impact of preparation parameters and the dosage of anti-fogging and anti-dropping masterbatch on the mechanical properties and non-dropping properties of the film has been investigated by versatile mechanical testing machine, atomic force microscope (AFM), contact angle tester, water bath acceleration method. The results show that the elongation at break and tensile strength of the composite film, contact angle of water and the film have decreased after added the anti-fogging and anti-dropping masterbatch. The addition of the anti-fogging and anti-dropping masterbatch can increase the non-dropping property of the greenhouse film greatly.

Abstract: The rheological properties of konjac glucomannan (KGM) solution were measured by HAAKE Rotational Rheometer, and the results indicated that KGM solution began to transform from Newtonian fluid to non-Newtonian fluid above 0.10 wt%, which represented the overlap of molecular chains. When the concentration exceeded 1.00 wt%, the entanglements of molecular chains became obvious, and the KGM sol formed. Furthermore, the rheological formulas of KGM solution were simulated very regularly, and the parameters of viscosity (η) and non-Newtonian index (n) held the relationship of exponential function to concentration (C), however, the consistency coefficient (κ) displayed a power function, then their concentration-dependence functions were as follows: η=-0.33+1.17e^16.80C, n=0.29+0.79e^-2.56C, and κ=29.11C^3.17. Finally, the rheological properties from diluted solution to KGM sol were revealed.

Abstract: Dissipative particle dynamics (DPD) is used in this work to simulate the distribution of carmustine (BCNU) molecules in konjac glucomannan (KGM) as potential drug carrier. It is shown from DPD simulation that the aggregated morphology of KGM differs at varying BCNU concentration levels. At 1 mol % of BCNU the phase aggregates as spherical particles, and at 5 mol% of BCNU, some BCNU molecules were partially uncovered by KGM molecules due to high drug concentration. However, even at higher concentration, most of the BCNU molecules are distributed in the inner area of the matrix, indicating that KGM interacts with BCNU well and it is a promising drug carrier for BCNU in water. DPD simulations may provide a powerful tool for designing drug delivery systems.

Abstract: In this work, ferric stearate, ferrocene and nickel N,N-dibuty dithiocarbamate (NiDBC) were utilized as photocatalyst for the decolorization of methylene blue (MB) aqueous solutions under sunlight irradiation. Pure MB solution was used as reference. Absorption intensities and surface morphology of these photocatalyst were investigated by Diffuse Reflectance Spectroscopy (DRS) and Scanning Electron Microscopy (SEM).The study indicated that ferric stearate had minimal promotion to the decolorization of MB aqueous solutions; and ferrocene exhibited better photocatalysis ability after had been irradiated 60 hours. In this study, NiDBC showed the best photocatalysis ability from the beginning. Furthermore, NiDBC enhanced the decolorization of MB after been irradiated for 31 hours. And after being irradiated 270 hours, the MB aqueous was completely decolorized by NiDBC.

Abstract: The adsorption of Cd(II) ions from aqueous solution by sodium hydroxide-treated bamboo powder（STB） was studied in a batch adsorption system. Characteristics of STB were investigated by scanning electron microscopy (SEM) and electron dispersive spectroscopy (EDS). Factors influencing adsorption such as pH of the solution, adsorbent dosage, cadmium concentration and temperature have been studied. The adsorption process was relatively fast and equilibrium was achieved after 120 min, and the maximum adsorption of Cd(II) ions occurred at around pH 6.5. The equilibrium data were fitted using Langmuir, Temkin and Freundlich isotherm models to calculate isotherm constants. And the adsorption isotherm fitted well Langmuir isotherm, and the maximum adsorption capacity was 8.987 mg/g.

Abstract: New thermoplastic soy protein isolated (SPI) and methyl methacrylate (MMA) copolymers (T-SPI) were prepared using graft copolymerization and initiated with ammonium persulfate (APS). The reaction conditions such as initiator concentration and temperature on the graft percentage (GP) were investigated. The single factor experimental showed that the optimal conditions of the graft reaction. The products were characterized by means of FT-IR and DSC. The results indicated that the monomer was grafted successfully on SPI and the T-SPI had a glass transition at 122°C, and the most important, the water absorption of materials declined obviously.

Abstract: The performance of expanding rice husk (ERH) fixed bed column in removing Zn (II) from aqueous solution were studied in this work. Different column design parameters like bed height, flow rate and initial concentration were calculated. It was found that ERH was found to be an effective adsorbent for removal of Zn (II); and when conducted with Zn (II) concentration 12.8 mg L^-1 and flow rate 10 ml min^-1 with different bed depths such as 3, 6 and 9 cm, the equilibrium uptake was decreased from 5.181 to 4.33 mg g^-1; the equilibrium uptake also decreased from 4.51 to 3.807 mg g^-1 with increasing of flow rate from 5 to 15 ml min^-1 and increased from 4.447 to 5.752 mg g^-1 when initial concentration increased from 12.8 to 35 mg L^-1. The dynamics of adsorption process was modeled by bed depth service time (BDST), and indicating the validity of BDST model when applied to the continuous column studies.

Abstract: New thermoplastic soy protein isolated (SPI) and methyl acrylate (MA) copolymers (T-SPI-g-MA) were prepared using graft copolymerization and initiated with ammonium persulfate (APS). The reaction conditions such as initiator concentration and temperature on the graft percentage (GP) were investigated. The single factor experimental showed that the optimal conditions for grafting of 15g SPI were: 4 g initiator of APS, 60 mL monomer of MA and in 250 mL 2M urea aqueous solution at 70 °C for 3 hours. The products were characterized by means of FT-IR and DSC. The results indicated that the monomer was grafted successfully on SPI and the T-SPI-g-MA had a glass transition at 22 °C.

Abstract: A fixed bed of raw rice husk was used for the removal of Zn (II) from aqueous solution. The material as adopted was found to be an efficient media for the removal of Zn (II) in continuous mode using fixed bed column. Different column design parameters like depth of exchange zone, flow rate and initial concentration were calculated. When conducted with Zn (II) concentration 10 mg.L^-1 and flow rate 10 ml.min^-1 with different bed depths such as 3, 6 and 9 cm, the equilibrium uptake was 3.366, 2.847 and 2.764 mg.g^-1, respectively. The equilibrium uptake decreased from 2.802 to 1.975 mg.g^-1 with increasing of flow rate from 5 to 15 mL.min^-1 and increased from 2.764 to 3.798 mg.g^-1 when initial concentration increased from 10 to 30 mg.L^-1. The dynamics of adsorption process was modeled by bed depth service time (BDST), and indicating the validity of BDST model when applied to the continuous column studies.

Abstract: In this paper, we have studied the photocatalytic activity of TiO₂ which was modified by ferric stearate; ferrocene and nickel N,N-dibuty dithiocarbamate (NiDBC) , respectively. Innovatively, methylene blue (MB) was used as model pollutant. Under visible light irradiation, this paper studied the effect of the photocatalytic degradation of MB. The result shows that when the mass ratio is 5:1, the catalytic effect is C>B>A. When mass ratio is 1:1, the catalytic effect is B>C>A. Another result shows that with the increase of the amount TiO₂, catalytic effect of TiO₂ modified by ferric stearate significantly increases, otherwise, TiO₂ modified by ferrocene and NiDBC were different.