Marto J, São Marcos P, Trindade T, Labrincha J A
Ceramics and Glass Engineering Department, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal.
J Hazard Mater. 2009 Apr 15;163(1):36-42. doi: 10.1016/j.jhazmat.2008.06.056. Epub 2008 Jun 22.
In this work ZnO layers have been deposited by screen-printing in common ceramic tiles. These layers were characterized and tested for the photocatalytic degradation of the organic dye Orange II in aqueous solutions, using a batch photoreactor either under visible light provided by a Philips ML-160 W lamp or under direct exposure to sunlight. For sake of comparison, ZnO suspensions have also been evaluated for similar reacting conditions. The influence of experimental parameters such as (i) firing temperature of the printed layer; (ii) layer thickness; and (iii) operation time have been investigated. Screen-printed ZnO layers obtained in optimal processing conditions showed photocatalytic activity comparable to aqueous ZnO suspensions. The maximal attenuation degree is over 70% and decolourisation rate, assuming that reaction kinetics follows a pseudo-first order rate law, is over 0.015 min(-1). Thus these ZnO-layered ceramic tiles can be regarded as an alternative to photocatalytic suspensions of the same material with the advantage of avoiding the removal of the photocatalyst.
在这项工作中，通过丝网印刷在普通瓷砖上沉积了氧化锌层。对这些层进行了表征，并使用间歇式光反应器在飞利浦ML - 160 W灯提供的可见光下或直接暴露于阳光下，测试了其对水溶液中有机染料橙黄II的光催化降解性能。为了进行比较，还评估了氧化锌悬浮液在类似反应条件下的性能。研究了诸如（i）印刷层的烧制温度；（ii）层厚度；以及（iii）操作时间等实验参数的影响。在最佳工艺条件下获得的丝网印刷氧化锌层显示出与氧化锌水悬浮液相当的光催化活性。最大衰减度超过70%，假设反应动力学遵循准一级速率定律，脱色率超过0.015 min⁻¹。因此，这些带有氧化锌层的瓷砖可被视为同一材料光催化悬浮液的替代品，其优点是无需去除光催化剂。
