光催化纳米TiO_2治理蓝藻工艺的研究  

Research on Technological Process for the Growth Inhibition of Cyanobacteria by Nanometric TiO_2 in Photocatalysis

作　　者：廖兴盛[1] 汪星[1] 赵开弘[1] 周明[1] 

机构地区：[1]华中科技大学环境科学与工程学院,武汉430074

出　　处：《武汉理工大学学报》2007年第6期16-19,共4页Journal of Wuhan University of Technology

基　　金：教育部新世纪优秀人才支持计划(NCET-04-0717);国家自然科学基金(30540070)

摘　　要：在波长253.7 nm紫外线C波段(UV-C)照射下,对受试蓝藻进行光催化纳米TiO2氧化反应,探讨反应参数对实验工艺处理效果的影响。对蓝藻生理指标叶绿素a(Chl-a)含量测定显示:在辐照光强0.15 mW/cm2、纳米TiO2浓度100 mg/L下反应,其Chl-a含量下降速率最快;随着辐照剂量、通入空气量(Qair)和反应温度的增大,其Chl-a含量下降速度不断加快;加入1.0 mmol/L H2O2加快了Chl-a含量下降,而加入20 mmol/L抗坏血酸(Vc)则减缓Chl-a含量下降;在偏碱性或低于纳米TiO2零电点(6.25)时,有利于加快Chl-a含量下降。结果表明,光催化纳米TiO2氧化反应能够有效降低受试蓝藻Chl-a含量,在以上参数适宜反应条件下,可以更好提高光催化纳米TiO2治理蓝藻工艺的处理效果。Under ultraviolet radiation at a wavelength of 253.7 nm （UV-C）, photocatalytic oxidation reaction with nanometric TiO2 was investigated for the growth inhibition of cyanobacteria, and some possible factors influenced the photocatalytic activities were analyzed. Among the physiological parameter of experimental cyanobacteria, Chlorophyll-a （Chl-a） contents have been tested, and the result showed that at radiation light intensity 0.15 mW/cm^2 or nanometric TiO2 concentration 100 mg/L, most rapid decreasing rates of Chl-a contents occurred. At higher radiation dose, air dosage （Qair）, and reaction temperature or under H2O2 dosage 1.0 mmol/L, more rapidly decreasing rates of Chl-a contents obtained. However, under vitamin c dosage 20 mmol/%, showed more slowly decreasing rates of Chl-a contents than the control. The study demonstrated an effective reducing Chl-a contents of experimental cyanobacteria on photocatalytic oxidation reaction with nanometric TiO2, and the better effect have won for photocatalytic reactor of growth inhibition of cyanobacteria in case of optimum reaction condition.

关 键 词：鱼腥藻PCC7120 光催化氧化反应 纳米TIO2 

分 类 号：X131.2[环境科学与工程—环境科学] X17