Removal of hexavalent chromium from contaminated waters by ultrasound-assisted aqueous solution ball milling

作     者：Lin Chen Zhenhua Chen Ding Chen Wei Xiong 

作者机构：College of Materials Science and EngineeringHunan UniversityChangsha 410082China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2017年第29卷第2期

页      面：276-283页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：supported by the Hunan Provincial Natural Science Foundation of China(No.14JJ1013) 

主　　题：Cr(VI) Ultrasound wave Ball milling Hydroxyl radicals 

摘      要：Batch mode experiments were conducted to study the removal of hexavalent chromium（Cr（Ⅵ）） from aqueous solutions using ultrasound-assisted aqueous solution ball *** results show that the reduction rate of Cr（Ⅵ） by ultrasound-assisted aqueous solution ball milling was significantly faster than that by ball milling or ultrasound treatment alone,and an initial Cr（Ⅵ） concentration of 166 mg/L could be decreased to 0.35 mg/L at 120 *** decisive factors, including initial concentration of Cr（Ⅵ）, p H value, ultrasonic frequency and filling gas, were studied. It was found that the optimal ultrasonic frequency for ultrasound-assisted aqueous solution ball milling device was 20 k Hz, and the rate of Cr（Ⅵ）reduction as a function of filling gas followed the order： Ar 〉 air 〉 N2〉 O2. Samples were characterized by X-ray diffraction, fluorescence measurements, atomic absorption and the diphenylcarbazide colorimetric method. The Cr（Ⅵ） transformed into a precipitate that could be removed from the contaminated water, after which the water could be reused.