纳米Fe_2O_3的制备及其光催化降解造纸废水  

Synthesis of nano-Fe_2O_3 and its photocatalytic degradation for paper mill effluent

作　　者：李爱梅[1] 杨海真[1] 朱亦仁[2] 

机构地区：[1]同济大学污染控制与资源化研究国家重点实验室,上海200092 [2]徐州师范大学化学化工学院,江苏徐州221116

出　　处：《江苏大学学报（自然科学版）》2010年第6期716-720,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：国家科技重大专项(2009ZX07318-006)

摘　　要：利用固相法、回流均匀沉淀法和超声均匀沉淀法等3种方法,制备了多种可见光响应半导体催化剂氧化铁.相同试验条件下,考察了不同制备方法和制备条件对催化剂活性的影响,并用活性最佳的氧化铁对草浆造纸废水进行了光催化降解研究.试验结果表明:微波干燥和高温煅烧均能增强Fe2O3的光活性,且均匀沉淀法较其他两种方法制备的催化剂光活性好;催化剂TEM和RXD检测表明催化剂颗粒平均粒径均小于50 nm;废水pH=3.0,催化剂质量浓度1.0 g/L,H2O2体积分数5‰,紫外光照3 h后,COD去除率达93.1%,出水ρ(COD)为72 g/L,达到国家最新颁布的造纸废水排放标准,且催化剂多次重复使用和废水水样放大对催化剂活性和处理试验效果影响不大.High-efficiency and low power consumption of wastewater treatment is the key to the paper-mill wastewater discharge.Semiconductor photocatalytic oxidation technology has great potential applications.Different Fe2O3catalysts for light response were synthesized by solid phase reaction,homogeneous precipitation of reflux and ultrasonic-homogeneous process under different drying and calcination conditions.Under the same condition,the influence of synthesis method,drying and calcination conditions to photoca-talytic activity were investigated.The photocatalytic degradation effluent from straw pulp and paper mill was studied with the most active Fe2O3.The results show that microwave drying and higher calcination temperature can improve the photoactivity of catalyst.The catalysts prepared by homogeneous precipita-tion of reflux have better activity than catalysts prepared by other methods.The average diameters of catalysts are all less than 50 nm as observed by using transmission electron microscope and X-ray diffraction pattern.The COD removal rate reaches 93.1% in the presence of Fe2O3（1.0 g/L） at pH=3.0 for 3 h under UV light,and the COD of effluent is 72 mg/L,which is in the range of the acceptable values of the government standard.The photoactivity and photocatalytic efficiency are seldom influenced by catalyst reutilization and wastewater dosage.

关 键 词：FE2O3 微波干燥 高温煅烧 光催化 降解 造纸废水 

分 类 号：X793[环境科学与工程—环境工程]