偕胺肟基乙烷桥键介孔二氧化硅对铀的吸附研究  

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

作　　者：杨金辉 戴漾泓 陆森 杨斌 王亮 黎传书 雷增江 骆毅 YANG Jin-hui;DAI Yang-hong;LU Sen;YANG Bin;WANG Liang;LI Chuan-shu;LEI Zeng-jiang;LUO Yi(School of Architecture and Construction,University of South China,Hengyang 421000,Hunan Province,China;China Nuclear Power Operations Co.,Ltd.,Yangjiang 529500,Guangdong Province,China;Hunan Sunny Technology Engineering Co.,Ltd.,Hengyang 421000,Hunan Province,China;CNNP Xiapu Nuclear Power Co.,Ltd.,Ningde 355100,Fujian Province,China)

机构地区：[1]南华大学土木工程学院,湖南衡阳421000 [2]中广核运营公司阳江分公司,广东阳江529500 [3]湖南核三力技术工程有限公司,湖南衡阳421000 [4]中核霞浦核电有限公司,福建宁德355100

出　　处：《化学工程》2020年第4期1-5,21,共6页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(21177053,51174117);湖南省科技厅项目(2011SK2015,2011SK3092,2008FJ3087)。

摘　　要：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 temperature 303 K,the adsorption effect is better,the maximum adsorption rate is 99.04%,and the adsorption amount can reach 25 mg/g.The adsorption process fits well with quasi-second-order kinetic model(R^2>0.99),Langmuir and Freundlich isothermal adsorption model(R^2>0.98).The adsorption process of uranium by AO-PMOs is dominated by amidoxime group.

关 键 词：二氧化硅 铀溶液 偕胺肟基 吸附 

分 类 号：TB332[一般工业技术—材料科学与工程]