改性海藻酸钠凝胶球去除稀土废水中的U(Ⅵ)  

Removal of U(Ⅵ) from Rare Earth Wastewater byModified Sodium Alginate Gel Microspheres

作　　者：史艳丹 谢水波 麦颖清[1] 刘迎九 李绪忠 林毅[1] SHI Yandan;XIE Shuibo;MAI Yingqing;LIU Yingjiu;LI Xuzhong;LIN Yi(School of Civil Engineering,University of South China,Hengyang 421001,China;Hunan Provincial Key Laboratory of Pollution Control and Resource Technology,University of South China,Hengyang 421001,China;Changsha Nonferrous Metallurgy Design&Research Institute Co.,Ltd.,Changsha 410000,China)

机构地区：[1]南华大学土木工程学院,衡阳421001 [2]南华大学污染控制与资源化技术湖南省重点实验室,衡阳421001 [3]长沙有色冶金设计研究院有限公司,长沙410000

出　　处：《有色金属工程》2023年第8期138-147,共10页Nonferrous Metals Engineering

基　　金：湖南省自然科学基金项目(2021JJ30579)。

摘　　要：通过一步滴定凝胶法制备了三聚氰胺协同戊二醛改性海藻酸钠复合生物材料(Me@SA/GA),用于稀土废水中U(Ⅵ)的去除。结果表明,Me@SA/GA制备时SA∶Me最优比例为3∶1,当U(Ⅵ)初始浓度为5 mg/L,pH值为5时,静态吸附试验中,Me@SA/GA投加量0.1 g/L,吸附15 h,对水中U(Ⅵ)的吸附量达到19.75 mg/g;动态吸附试验中,以1 mL/min的流速过柱,Thomas模型拟合其饱和吸附量为526.6 mg/g。傅里叶变换红外光谱(FTIR)、X射线光电子能谱仪(XPS)表征结果表明Me@SA/GA吸附U(Ⅵ)的相互作用包括静电吸引、颗粒内扩散以及水凝胶的官能团(羧基、氨基和羟基)与U(Ⅵ)的配位。当Me@SA/GA投加量为1 g/L,对某实际稀土废水进行试验,其出水U(Ⅵ)浓度为0.02 mg/L,可达到我国稀土工业污染物排放标准(GB 26451—2011)要求。Cyanamine-glutaraldehyde modified sodium alginate composite biomaterial(Me@SA/GA)was prepared via one-step titration gel method for the removal of U(Ⅵ)from rare earth wastewater.The effects of adsorption time,pH,and other factors on U(Ⅵ)in Me@SA/GA adsorption water were investigated.The uranium removal capacity and dynamic adsorption performance of Me@SA/GA were studied.The results show that the optimal SA:Me ratio of Me@SA/GA is 3∶1.Under the conditions of static adsorption for 15 h,initial U(Ⅵ)concentration is 5 mg/L,pH=5,and Me@SA/GA dosage is 0.1 g/L,the adsorption capacity of U(Ⅵ)in water reaches 19.75 mg/g.Under the condition of dynamic adsorption,at the same concentration and pH value,the flow rate of 1 mL/min through the column,the saturated adsorption capacity fitted by Thomas model is 526.6 mg/g.The results of FTIR and XPS characterization before and after Me@SA/GA adsorption show that the adsorption interactions included electrostatic attraction,intra-particle diffusion,and the coordination of the functional groups(carboxyl,amino and hydroxyl)with U(Ⅵ)of the hydrogel.The addition of 1 g/L at Me@SA/GA is used in the practical rare earth wastewater test,and the concentration of U(Ⅵ)after treatment is 0.02 mg/L,which meets the requirements of discharge standard of rare earth industrial pollutants in our country(GB 26451—2011).

关 键 词：海藻酸钠凝胶球 三聚氰胺 稀土废水 U(Ⅵ) 

分 类 号：X751[环境科学与工程—环境工程]