Affiliations: Department of Environmental Science and
Engineering,Tsinghua University,Beijing 100084,China, E-mail:xibeidou @ 263.net
| Institute of Environmental Material,Chinese Academy of
Environmental Sciences,Beijing 100012,China
Abstract: Titanium dioxide(TiO_2 ) samples of different crystal forms were
prepared by hydrolysis tetrabutyl titanate in various water to alkoxide ratios
and sintering the hydrolysis product at different temperatures.The
photocatalysts coated on hollow glass beads and loaded with platinum varying
from 0.2% to 2.4% by weight.The photecatalytic degradation rate of sodium
pentachlorophenolate (PCP- Na) depends on the preparing conditions such
as.:sintering temperatures,water to alkoxide ratios(R),platinum content and the
size.The proper conditions of preparation photoeatalysts are as follows:the
ratio of TiO_2:sodium silicate :hollow glass beads :platinum is
10:5:20:0.15(w/w),R is 100,sintering temperature is 650°C,and the size of
hollow glass is 0.5 - 1 mm.Under these conditions,the ratio between acatase and
rutile of the photocatalyst is 2:1,and the photocatalytic activity is high.
Keywords: photocatalysts, tetrabutyl titanate hydrolysis, water to alkoxide ratios (R), sintering temperature , platinum, hollow glass beads, sodium pentachlorophenolate (PCP-Na)
