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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 TiO2-SiO2 Photocatalyst |
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DOI:10.11980/j.issn.0254-508X.2012.01.007 |
关键词: TiO2-SiO2 光催化剂 CODCr去除率 制浆中段废水 |
Key Words:TiO2-SiO2 photocatalyst CODCr removal percentage paper mill wastewater |
基金项目:省部共建国家重点实验室开放课题(K-092006)。 |
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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。 |
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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