溶胶-凝胶法制备的TiO_2对制浆黑液光催化降解的研究

Photocatalytic Purification of Pulping Wastewater on Semiconductor TiO_2 Prepared by Sol-Gel

用溶胶—凝胶(Sol-Gel)法制取半导体金属氧化物TiO2粉末,并对其进行热处理。在紫外光照射下,用其作光催化剂对制浆黑液进行降解处理。实验结果表明,在持续通氧的情况下,该TiO2粉末对制浆黑液有着很好的光催化降解作用。在体系中添加少量的该TiO2,经反应数小时后,可以将原本深棕色的污水变得清澈无色,与普通的水并无二致。其化学需氧量(CODcr)可由反应前的近1000 mg/L下降至不到400 mg/L,基本符合国家要求的二类水域的排放标准。

The metal oxide semiconductor, titania was prepared by Sol-Gel method and this titania was undergone a certain heat treatment. In the presence of this titania, pulping wastewater was irradiated by ultraviolet to purify it. A small quantity of this titania can well degrade organic compounds in this wastewater, especially lignin, bubbling with oxygen during ultraviolet radiation. After reaction for several hours, the color of this wastewater is faded from nigger-brown to colorless. Its CODcr is decreased from 1000 mg/L to 400 mg/L.