Cu^(2+)-TiO_2/偕胺肟纤维的制备及其光催化降解性能  

Preparation and photocatalytic degradation properties of Cu^(2+)-TiO_2/AOCF

作　　者：许茂东[1] 宋慧[1] 胥佳斌 陶庭先[1] 

机构地区：[1]安徽工程大学生物与化学工程学院,芜湖241001

出　　处：《环境工程学报》2016年第7期3647-3652,共6页Chinese Journal of Environmental Engineering

基　　金：安徽省高校自然科学基金重大项目(KJ2014ZD03);安徽省高等教育提升计划一般项目(TSKJ2014B18)

摘　　要：以偕胺肟纤维为配体和载体,常温下通过"配位-水解"方法,制备Cu^(2+)改性TiO_2/偕胺肟纤维复合材料(Cu^(2+)-TiO_2/AOCF)。采用XRD、SEM和EDS对Cu^(2+)-TiO_2/AOCF晶体结构、形貌和表面成分进行分析表征。结果表明,TiO_2纳米颗粒均匀分布在纤维表面,呈无定型态。以光催化降解活性黄染料的降解率为指标,优化了制备工艺条件,结果显示,Cu^(2+)-TiO_2/AOCF的最佳制备条件:氯化铜浓度c=1.5 mmol·L^(-1)、掺杂时间t=20 min、pH=3.0。对活性黄和甲基橙的光催化降解反应表明,当染料溶液pH=2.0、太阳光光源、催化剂用量为0.500 0 g·L^(-1)时,催化降解效率能达到95.7%。催化剂可重复使用6~8次且能保持光催化能力,2种溶液的催化降解反应均符合一级反应动力学特征。紫外可见光谱(UV-vis)和光致发光光谱(PL)分析表明,Cu^(2+)的改性降低了TiO_2禁带宽度,使其光谱响应范围变宽。Using amidoxime fiber both as a carrier and ligand,Cu2＋-modified TiO_2/ fiber composites were prepared by ＂ligand hydrolysis＂at room temperature. The crystal structure,morphology,and elemental composition of the materials were characterized by X-ray diffraction,scanning electron microscopy,and energy dispersive X-ray spectroscopy,respectively. The results showed that TiO_2 nanoparticles were uniformly distributed on the surface of the fiber. The photocatalytic properties of reactive yellow dye were used as an indicator to optimize the preparation conditions. The optimal photocatalytic degradation efficiency of the catalyst for reactive yellow was achieved when the concentration of copper chloride was 1. 5 mmol·L-1,the doping time was 20 min,and pH =3. 0. Based on the photodegradation of reactive yellow and active methyl orange,it was found that the catalytic degradation efficiency could reach 95. 7% under sunlight irradiation when the pH of the dye solution was 2. 0 and the catalyst loading was 0. 500 0 g·L-1. The catalyst could be reused 6 to 8 times. The photocatalytic decolorization reactions of the two solutions fit well to the first-order kinetics model. Photoluminescence and ultraviolet-visible spectroscopy showed that the Cu2＋-modified reduced TiO_2 had a forbidden band gap. The absorption band edge was red shifted,broadening the range of spectral response.

关 键 词：Cu2+改性 二氧化钛 偕胺肟纤维 光催化 

分 类 号：X703[环境科学与工程—环境工程]