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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 as ligand and carrier, the Cu 2+ modified epoxy-modified TiO 2 / amidoxime fiber composites (Cu 2 + -TiO 2 / AOCF). The crystal structure, morphology and surface composition of Cu ~ (2 +) - TiO_2 / AOCF were characterized by XRD, SEM and EDS. The results show that the TiO 2 nanoparticles are uniformly distributed on the surface of the fiber and are in an amorphous state. The photocatalytic degradation of active yellow dye degradation rate as an indicator to optimize the preparation conditions, the results show that Cu ~ (2 +) - TiO 2 / AOCF optimal preparation conditions: concentration of copper chloride c = 1.5 mmol · L ~ ( -1), doping time t = 20 min, pH = 3.0. The photocatalytic degradation of Reactive Yellow and Methyl Orange showed that the photocatalytic degradation efficiency reached 95.7% when the dye solution pH = 2.0 and the solar light source was 0.500 0 g · L -1. The catalyst can be reused 6 to 8 times and can maintain the photocatalytic activity. The catalytic degradation reactions of the two solutions are in accordance with the first-order kinetic characteristics. The results of UV-vis and PL indicate that the modification of Cu 2+ reduces the band gap of TiO 2 and broadens the spectral response range.