Papers by Author: Tao Wang

Abstract: Nanostructured SnO₂ was prepared by a parallel flow method under ultrasonic vibration. The photocatalytic performance of SnO2 was investigated by utilizing photocatalytic decolorization of methyl orange used as model organic pollutant. SnO2 prepared was characterized by BET, XRD and SEM. The results show that ultrasonication can influence greatly the specific surface parameters, SEM image and particle size, thus leading to better photocatalytic performance. The photocatalytic performance of SnO2 prepared by ultrasonication is 1.5 times of that of SnO2 prepared without ultrasonication.

Abstract: Ni/poly(m-toluidine)(PMT) nanocomposites were prepared by in situ chemical oxidative polymerization of m-toluidine (MT) monomer in the presence of Ni powder, with ammonium persulfate (APS) as oxidant and citric acid (C₆H₈O₇) as dopant. The resultant products were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and superconducting quantum interference device magnetometer (SQUID). The results exhibited that Ni/PMT nanocomposites show a ferromagnetic behavior with saturation magnetization strength (Ms) and coercivity of 28.4emu/g and 105.8Oe at room temperature. The prepared Ni/PMT composites were soft and ferromagnetic materials. Moreover, thermal Stability of nanocomposites was also investigated.

Abstract: The catalytic hydrolysis of Bis(p-nitrophenyl) phosphate ester (BNPP) in the metallomicelle made up of Ce³⁺-diethylenetriamine and LSS (N-lauroyl sarcosinate) was investigated by UV/VIS method. The effect of the catalytic efficiency and stability of the system was studied under the different conditions. The results indicated that the catalytic system exhibited high activity, stability and reproducibility in the BNPP catalytic hydrolysis under proper proportion of Ce³⁺ ion and diethylenetriamine, pH and temperature when the concentration of LSS is higher than its CMC (critical micelle concentration). The results also showed that the active species is the complex made up of Ce³⁺ ion and diethylenetriamine.

Abstract: In this paper, parallel flaw precipitation method has been employed to fabricate nanostructured Co₃O₄ with the assistance of different surfactants. It is found that the surface parameters, SEM image and photocatalytic performance of Co₃O₄ have a strong dependence on the type of surfactants. The prepared photocatalysts Co₃O₄ were characterized by BET, XRD and SEM. The results show that Co3O4 prepared with the assistance of sodium dodecylbenzenesulfonate exhibits the best photocatalytic activity among the experimented compositions. The surface parameters and SEM all play an important role in promotion of photocatalytic activity of Co₃O₄ prepared.

Abstract: This report has shown that the dye of Methyl Orange (MO) in water can be decolorized effectively in the presence of KIO₃ under UV irradiation. Decolorisation efficiency of MO increases as the loading of KIO₃ increases and has no an optimal amount of KIO₃ in this case. The kinetic result shows that the decolorisation reaction is a pseudo first-order reaction when the concentration of MO is below 10 mgL-1. The influences of the pH value and hydroxyl radical scavengers on the decolorisation reaction were investigated in detailed. Several observations indicate that the mechanism is not the attack of hydroxyl radicals in MO decolorisation with KIO₃ under UV irradiation. More considerations should be focused on the underlying possible decolorisation mechanism of MO with KIO₃ under UV irradiation.

Abstract: Phosphate ester and its ramifications in the pesticide are virulent and some are known to be human carcinogens. The removal of phosphate ester in the leftover of the pesticide has been a major environmental concern. The Cerium(III) complex made up of a nitrogen unsaturated heterocycle ligand and Cerium ion(III) was used in the catalytic degradation of bis(4-nitrophenyl) phosphate ester (BNPP). This catalytic system showed higher catalytic activity and better reproducibility and stability than other similar Cerium(III) systems. The rate of the BNPP catalytic degradation was about 109 -fold faster than that of its spontaneous degradation at the same conditions. The Cerium(III) complex is an very effective catalyst in the degradation of the phosphate ester.