期刊论文

Efficiency and mechanism of nano-crystalline mineral treatment of uranium-bearing wastewater

Liu, Y.

中文

化学工程

1005-9954

2020

48

1

12-17

10.3969/j.issn.1005-9954.2020.01.003

A050507:国家自然科学基金 51574152:国家自然科学基金 51704169:国家自然科学基金 2017JJ4019:湖南省自然科学基金 2018JJ3444:湖南省自然科学基金 2017JJ4232:湖南省自然科学基金 17A180:湖南省教育厅项目 2017CT5006:湖南省科技厅中央引导地方科技发展专项资金项目 2017SYL05:南华大学双流一建设项目 2016XQD37:南华大学博士启动基金

本校为第一且通讯机构

以凹凸棒土、海泡石、硅藻土等为原料制备了颗粒状的纳米矿晶(NMC)吸附剂,研究了NMC在不同pH值、NMC用量、吸附时间和铀离子(U(Ⅵ))初始质量浓度对U(Ⅵ)的去除效能的影响。通过扫描电镜、X射线能谱仪、红外光谱等检测手段解析了NMC吸附U(Ⅵ)的机理。研究结果表明:NMC适用于酸性条件下处理含铀废水。当含铀废水pH值、U(Ⅵ)质量浓度、NMC投加量分别为2.0,20.0 mg/L,30 ℃,7.0 g/L时,废水中U(Ⅵ)去除效率高达97.4%。NMC吸附U(Ⅵ)的过程以化学吸附为主,准二级吸附动力学模型相关系数R~2=0.991。扫描电镜和X射线能谱分析发现,U(Ⅵ)主要吸附在NMC的表面孔内;红外光谱分析结果表明配位、络合、离子交换...

Granular nano-mineral (NMC) adsorbent was prepared by attapulgite, sepiolite and diatomite. Different experimental parameters, such as solution pH, dosing, initial mass concentration and contact time, were examined to investigate their effects on the adsorption of uranium by NMC. The mechanism of U (Ⅵ) adsorption on NMC was analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and infrared spectroscopy (FTIR), respectively. The results show that the NMC is suitable for the treatment of uranium-bearing wastewater ...