混凝-光催化联用技术处理制浆中段废水的研究--TiO2-SiO2光催化剂的制备  

Treatment of Paper Mill Wastewater by Coagulation Coupled with Photocatalysis——The Preparation of TiO_2-SiO_2 Photocatalyst

作　　者：郑堰日[1,2,3] 刘以凡[1,2,3] 刘明华[1,2,3] 

机构地区：[1]福建省光催化重点实验室--省部共建国家重点实验室培育基地,福州大学,福建福州350002 [2]福州大学环境与资源学院,福建福州350108 [3]福建省生物质资源化技术开发基地,福建福州350108

出　　处：《中国造纸》2012年第1期28-32,共5页China Pulp & Paper

基　　金：省部共建国家重点实验室开放课题(K-092006)

摘　　要：以钛酸丁酯、正硅酸乙酯、无水乙醇等为原料,采用Sol-Gel法制备TiO2-SiO2光催化剂,通过单因素实验得到最佳制备工艺条件为:n(钛酸丁酯)∶n(正硅酸乙酯)为2.33∶1,煅烧温度为600℃,煅烧时间为3 h,反应溶液pH值为3。当进水CODCr为379.5 mg/L,TiO2-SiO2光催化剂的投加量为0.5 g/L,紫外光照时间为3 h时,出水CODCr为67.8 mg/L。TiO2-SiO2光催化剂颗粒大小为100～500 nm,具有较高的催化活性和稳定性,可以多次重复使用。对比实验表明,TiO2-SiO2处理制浆中段废水的效率比TiO2高。TiO2-SiO2 photocatalyst was prepared by using butyl titanate, tetraethoxysilane, absolute ethanol as raw material and adopting Sol- Gel technique. The preparation conditions were optimized by the signal-factor experiments, and the optimum conditions included 2.33 ： 1 of the mole ratio of butyl titanate and tetraethoxysilane, 600% of the calcining temperature, 3 h of the calcining time and 3 of solution pH value. The CODCr of the treated wastewater could be reduced to 67.8 mg/L under the conditions of 3 h of UV irradiation and 0.5 g/L of the TiO2-SiO2 dosage. The particle size of TiO2-SiO2 photocatalyst ranged from 100 nm to 500 nm. TiO2-SiO2 photocatalyst showed high catalytic activity and stability, and it could be used repeatedly for several times. Moreover, the comparison of TiO2-SiO2 photocatalyst and TiO2 photocatalyst showed that, the treatment efficiency of paper mill wastewater by TiO2-SiO2 prevailed over TiO2 evidently.

关 键 词：TIO2-SIO2 光催化剂 CODCR去除率 制浆中段废水 

分 类 号：X793[环境科学与工程—环境工程]