Nano Lead Tungstate Preparation by Precipitation Method
Lead tungstate is a kind of tungstate. It has attracted extensive attention because of its luminescent properties and radiation resistance.
The results show that the lead tungstate crystal can exhibit blue, green and red absorption at a certain wavelength, and the requirement of attenuation time and radiation damage is far beyond the requirement of light yield.
The main preparation methods of lead tungstate are solid phase method and liquid phase method. But for the preparation of nano lead tungstate, liquid phase method is usually adopted, and precipitation method is one of liquid phase method.
The starting materials prepared by precipitation of nano lead tungstate particles with 99% purity of lead nitrate and 99.5% sodium tungstate, with deionized water as solvent, polyethylene glycol (PEG 200) as a dispersant to prepare nano lead tungstate powder.
According to the chemical dosage ratio of lead nitrate and sodium tungstate were dissolved in deionized water, stirring until completely dissolved, then to adding PEG 200 solution of lead nitrate and sodium tungstate, in order to achieve the effect of particle dispersion. In order to regulate the pH value of the reaction and to facilitate the reaction, a proper amount of ammonia was added into the sodium tungstate solution, the lead nitrate solution is then directly added to the sodium tungstate solution to give lead tungstate.
After the reaction was complete, the mixture was stirred for another 10 min to give a slightly yellowish turbid solution. After settling the turbidity liquid for about 120 min, lead tungstate could be found at the bottom of the vessel, the precipitate of sodium tungstate was washed with deionized water several times, and the precipitated precipitate was dried at 100 °C for a slight amount of nano lead tungstate powder.
In the nano lead tungstate powder preparation process, control the quantity of PEG 200 is one of the key can achieve the best dispersion effect, because PEG 200 plays a key role in solving the agglomeration between particles, when it is added to the solution, one end of the polymer chain can be attracted tightly to the surface of the particle, the other end extends into the liquid as much as possible to reduce the attraction between particles, thus achieving steric stabilization.
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