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以偕胺肟纤维(AOCF)为载体与AgNO3通过配位反应,再经水合肼还原制备纳米银/偕胺肟纤维(Ag/AOCF)。用扫描电镜观察纤维表面形貌。以Ag/AOCF为光催化剂,活性黄为降解对象,研究了Ag/AOCF的制备工艺和光催化降解反应的条件对降解率的影响,并考察了催化剂的重复使用与再生。结果表明,在硝酸银浓度为0.010 mol/L、配位反应时间为40 min、pH=3.0条件下制备的催化剂对活性黄的光催化降解效率最佳;当活性黄溶液的pH=3.0、太阳光光源、催化剂用量为0.25 g/L时催化降解活性黄,降解效率能达到95.7%,且催化剂在重复使用了4次后,其对活性黄的光催化降解效率仍能保持在80%以上。用四氢呋喃再生后可重复使用。
Nanosilver / amidoxime fiber (Ag / AOCF) was prepared by coordination reaction with AgNO3 with amidoxime fiber (AOCF) as carrier and reduction with hydrazine hydrate. Scanning electron microscopy was used to observe the fiber surface morphology. With Ag / AOCF as photocatalyst and active yellow as degradation target, the effects of preparation conditions of Ag / AOCF and photocatalytic degradation conditions on degradation rate were investigated. Reuse and regeneration of catalyst were also investigated. The results showed that the photocatalytic degradation efficiency of the active yellow was the best when the concentration of silver nitrate was 0.010 mol / L, the coordination reaction time was 40 min, pH = 3.0. When the pH value of the active yellow solution was 3.0, Light source, when the amount of catalyst is 0.25 g / L, it can catalyze the degradation of reactive yellow, the degradation efficiency can reach 95.7%, and the photocatalytic degradation efficiency of active yellow can still be kept over 80% after the catalyst is reused for 4 times. After regeneration with tetrahydrofuran can be reused.