期刊论文

Adsorption of uranium by mesoporous silica with amidoxime-based ethane bridge

中文

化学工程

1005-9954

2020

48

4

1-5,21

10.3969/j.issn.1005-9954.2020.04.001

21177053:国家自然科学基金 51174117:国家自然科学基金 2011SK2015:湖南省科技厅项目 2011SK3092:湖南省科技厅项目 2008FJ3087:湖南省科技厅项目

本校为第一机构

采用水热法合成了氰基化乙烷桥键的介孔材料,经胺肟功能化后制备出偕胺肟基介孔SiO 2材料(AO-PMOs)。利用AO-PMOs对铀溶液进行吸附实验,探讨了铀溶液初始质量浓度、pH值以及吸附时间对AO-PMOs吸附铀的影响,并采用FTIR,SEM,EDS技术进行表征分析。结果表明:在溶液初始pH值为5,铀质量浓度为10 mg/L,吸附剂投加量为20 mg,反应温度为303 K的条件下,吸附效果较佳,吸附率最大为99.04%,吸附量可达25 mg/g。该吸附过程与准二级动力学模型(R^2>0.99),Langmuir和Freundlich等温吸附模型(R^2>0.98)能较好地拟合。偕胺肟基在AO-PMOs吸附铀过程起主要作用。

Mesoporous materials of ethylene cyanide bridge bond (CN-PMOs) were synthesized by hydrothermal method and mesoporous silica with amidoxime- based ethane bridge (AO-PMOs) was prepared by functionalization of amidoxime. The effects of initial mass concentration of uranium solution, pH value and adsorption time on the adsorption of uranium by AO-PMOs were investigated. FTIR, SEM and EDS techniques were used to characterize the adsorption of uranium by AO-PMOs. The results show that under the conditions of initial solution pH 5, uranium mass concentration 10 mg/L, adsorbent dosage 20 mg, reaction...