title: Preparation of cube micrometer potassium niobate (KNbO3) by hydrothermal method and sonocatalytic degradation of organic dye.
abstract: Cube micrometer potassium niobate (KNbO3) powder, as a high effective sonocatalyst, was prepared using hydrothermal method, and then, was characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). In order to evaluate the sonocatalytic activity of prepared KNbO3 powder, the sonocatalytic degradation of some organic dyes was studied. In addition, some influencing factors such as heat-treatment temperature and heat-treatment time on the sonocatalytic activity of prepared KNbO3 powder and catalyst added amount and ultrasonic irradiation time on the sonocatalytic degradation efficiency were examined by using UV-visible spectrophotometer and Total Organic Carbon (TOC) determination. The experimental results showed that the best sonocatalytic degradation ratio (69.23%) of organic dyes could be obtained when the conditions of 5.00 mg/L initial concentration, 1.00 g/L prepared KNbO3 powder (heat-treated at 400 °C for 60 min) added amount, 5.00 h ultrasonic irradiation (40 kHz frequency and 300 W output power), 100mL total volume and 25-28 °C temperature were adopted. Therefore, the micrometer KNbO3 powder could be considered as an effective sonocatalyst for treating non- or low-transparent organic wastewaters.
authors.affiliation: College of Chemistry, Liaoning University, Shenyang 110036, PR China.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Zhang
authors.affiliation: College of Chemistry, Liaoning University, Shenyang 110036, PR China; National Police University of China, Shenyang 110854, PR China.
authors.forename: Chunsheng
authors.initials: C
authors.lastname: Wei
authors.affiliation: College of Chemistry, Liaoning University, Shenyang 110036, PR China.
authors.forename: Yingying
authors.initials: Y
authors.lastname: Huang
authors.affiliation: College of Chemistry, Liaoning University, Shenyang 110036, PR China. Electronic address: wangjun890@126.com.
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
keywords: Organic dye; Potassium niobate (KNbO(3)); Sonocatalytic degradation; Ultrasonic irradiation