层状钙钛矿H_(1.9)K_(0.3)La_(0.5)Bi_(0.1)Ta_2O_7光催化剂分解煤化工废水制氢研究

Photocatalytic activity from hydrogen production by splitting wastewater of coal chemical industry on layered perovskite H_(1.9)K_(0.3)La_(0.5)Bi_(0.1)Ta_2O_7

研究了质子化层状钙钛矿氧化物HKLBT在煤化工废水下的光催化制氢活性,考察了HKLBT在全波段和可见光下废水的浓度对催化活性的影响。结果显示:HKLBT能利用废水中的有机胺作为牺牲试剂从而具有高的制氢活性,由于其活性受到有机胺的浓度和煤化工废水中染料的双重影响,当废水浓度为5%活性最高,为纯水的1.5倍;HKLBT能被废水中的染料敏化从而在可见光下产氢,当废水浓度为20%时,制氢活性达到12.6μmol·h^(-1),优于P25活性。

Photocatalytic activity of hydrogen production by splitting wastewater of coal chemical industry was studied on a layered perovskite H1.9K0.3La0.5Bi0.1Ta2O7 photocatalyst. The effect of the concentration ofwastewater on photocatalytic activity under the full-wavelength light （λ 〉200 nm） and visible light （λ 〉400 nm） also was investigated. The result showed that HKLBT possessed higher photocatalytic activity in wastewater of coal chemical industry by use of organic amine as a sacrificial reagent. There is the highest photocatalytic hydrogen evolution with 1.5 times in pure water when the concentration of wastewater is 5 % due to the double interaction of both organic amine and dye which block the absorption of light by HKLBT. Furthermore, HKLBT could be sensitized by dye in wastewater and respond visible light to split water into hydrogen. The photocatalytic hydrogen evolution reached 12.6.mol . h-1 as concentration of wastewater is 20% , which is higher than that of P25.