摘要
采用聚丙烯酸钠(PAAS)和聚醚砜(PES)中空纤维超滤(UF)膜,研究配合-超滤工艺对Mn^(2+)和Co^(2+)的截留效果、分离效果以及配合竞争效应。单金属离子试验结果表明:随着m(P)/m(M)(聚合物/金属离子质量比)、pH增加,Mn^(2+)和Co^(2+)的截留率增大。随温度增大,Mn^(2+)和Co^(2+)的截留率先增加后减小,Mn^(2+)、Co^(2+)的截留率分别在20、25℃时达到最大。pH值=5、m(P)/m(M)=4、温度为20℃为最佳操作条件,分离率最大(64.70%),配合竞争效应最强。NaCl减弱了金属离子的竞争配合能力,不利于Mn^(2+)和Co^(2+)的分离。混合金属离子试验的最佳操作条件下分离率为57.41%。红外数据显示,Mn^(2+)和Co^(2+)均与PAAS配合,由于离子水化热以及电负性的不同,Mn^(2+)和Co^(2+)与PAAS配合亲和力不同,在相同的溶液环境下,Mn^(2+)优先与PAAS配合。
The effects of complexation-UF process on the interception,separation,and complexation competition of Mn^(2+)and Co^(2+)in aqueous solutions were investigated using sodium polyacrylate(PAAS)and polyether sulfone(PES)hollow fiber ultrafiltration(UF)membranes.The results of the experiments of single metal ions indicated that with the increases of m(P)/m(M)(the mass ratio of PAAS to metal ions)and pH,the interception of Mn^(2+)and Co^(2+)gradually increased.With increasing the temperature,the interception of Mn^(2+)and Co^(2+)first increased and then decreased.The maximum retention rates of Mn^(2+)and Co^(2+)were at the temperature of 20℃and 25℃,respectively.At the optimum operating conditions of pH value=5,m(P)/m(M)=4,and 20℃,the maximum separation rate was 64.70%,at which point the complexation competition effect was the strongest.The addition of NaCl weakened the competitive complexing ability of metal ions,which was not conducive to the separation of Mn^(2+)and Co^(2+).The mixed metal ion experiments showed that the separation rate was 57.41%at optimum operating conditions.Fourier transform infrared(FTIR)results indicated that both Mn^(2+)and Co^(2+)could be complexed with PAAS.However,Mn^(2+)and Co^(2+)had different complexing affinities towards PAAS owing to the differences in hydration heat and electronegativity.Under the same solution environment,Mn^(2+)preferentially complexed with PAAS.
作者
俞洁
李茂林
张翰文
赵蓓蓓
姚伟
崔瑞
YU Jie;LI Maolin;ZHANG Hanwen;ZHAO Beibei;YAO Wei;CUI Rui(School of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources,Wuhan 430081,China;Changsha Research Institute of Mining and Metallurgy Co.,Ltd.,Changsha 410012,China)
出处
《净水技术》
CAS
2024年第12期128-135,179,共9页
Water Purification Technology
基金
武汉科技大学“十四五”湖北省优势特色学科(群)项目(2023A0401)
武汉市科技局知识创新专项项目(2023020201020411)。
作者简介
俞洁(1996-),女,硕士,研究方向为膜分离,E-mail:742031615@qq.com;通信作者:崔瑞(1984-),男,博士,副教授,研究方向为选冶废物协同消纳与综合利用,E-mail:cuirui@wust.edu.cn。
