ZnO纳米阵列的制备及其压电效应对丁基钾黄药光降解的促进

Preparation of ZnO nanoarray and its piezoelectric effect on the promotion of photodegradation of butyl potassium xanthate

采用低温溶液法,以硝酸锌和氨水为原料,在不锈钢网基体上生长ZnO纳米阵列。通过SEM、XRD、UV-Vis DRS和IR等对光催化材料的结构和性能进行测试分析,进一步探讨压电效应对光催化降解丁基钾黄药的促进作用。结果表明,ZnO纳米阵列围绕不锈钢网紧密排列,形貌规整,具有平滑表面,直径(1~2)μm。制备的光催化材料在光照和超声条件下,90 min内对50 mg·L^(-1)丁基钾黄药溶液的降解率可以达到96.36%,降解反应速率常数k为0.0710×10^(-2)min^(-1),是光照条件的2.19倍。机理分析表明,ZnO在紫外线照射下产生光生电子和空穴,同时在超声作用下ZnO纳米棒发生变形产生压电场,压电效应能够促进光生电子和空穴的分离,从而提高ZnO纳米阵列对丁基钾黄药的降解效率。该研究为尾矿废水中黄药的去除提供了一种新的思路,在光催化处理有机污染方面有巨大的应用潜力。

Zinc nitrate and ammonia are used as raw materials to grow ZnO nano-arrays on the stainless steel mesh substrate by the low-temperature solution method.The structure and performance of photocatalytic materials were analyzed through SEM,XRD,UV-Vis DRS and IR.The piezoelectric effect on the promotion of photocatalytic degradation of butyl potassium xanthate was further discussed.The results show that the ZnO nanoarrays are closely arranged around the stainless steel mesh with a regular appearance and a smooth surface,and its diameter is about(1-2)μm.Under the conditions of light and ultrasound,the prepared photocatalytic material has a degradation efficiency of 96.36%for a 50 mg·L^(-1) butyl potassium xanthate solution within 90 minutes,and the degradation reaction rate constant k is 0.0710×10^(-2) min^(-1),which is 2.19 times of light conditions.Mechanism analysis shows that photoelectrons and holes are generated by ZnO under ultraviolet irradiation,and the ZnO nanorods are deformed under the action of ultrasound to generate a piezoelectric field.The piezoelectric effect can promote the separation of photoelectrons and holes,thereby improving the ZnO nanoarray degradation efficiency of p-butyl xanthate.This research provides a new idea for the removal of xanthate in tailings wastewater,and has huge application potential in photocatalytic treatment of organic pollution.