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Treatment of Paper Mill Wastewater by Coagulation Coupled with Photocatalysis——The Preparation of TiO2-SiO2 Photocatalyst
  
DOI：10.11980/j.issn.0254-508X.2012.01.007
Key Words:TiO2-SiO2  photocatalyst  CODCr removal percentage  paper mill wastewater
Fund Project:省部共建国家重点实验室开放课题（K-092006）。
Author NameAffiliation
郑堰日1，2，3 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 
刘以凡1，2，3 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 
刘明华1，2，3 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 
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Abstract:TiO2-SiO2photocatalyst 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-SiO2photocatalyst ranged from 100 nm to 500 nm. TiO2-SiO2photocatalyst showed high catalytic activity and stability, and it could be used repeatedly for several times. Moreover, the comparison of TiO2-SiO2photocatalyst and TiO2 photocatalyst showed that, the treatment efficiency of paper mill wastewater by TiO2-SiO2 prevailed over TiO2 evidently.
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