富磷水体中铀在水-钠长石界面的吸附机制研究  

URANIUM ADSORPTION MECHANISM AT THE WATER-ALBITEINTERFACE IN PHOSPHORUS-RICH WATER SYSTEM

作　　者：赵永才 王新宇[1,2] 施泽明 倪师军[1,2] 王瑞麟 ZHAO Yongcai;WANG Xinyu;SHI Zeming;NI Shijun;WANG Ruilin(School of Earth Sciences,Chengdu University of Technology,Chengdu,Sichuan 610059,China;Sichuan Provincial Key Laboratory of Geoscientific Nuclear Technology,Chengdu,Sishuan 610059,China;College of Materials and Chemical Engineering,Chengdu University of Technology,Chengdu,Sichuan610059,China)

机构地区：[1]成都理工大学地球与行星科学学院,四川成都610059 [2]地学核技术四川省重点实验室,四川成都610059 [3]成都理工大学材料化学与化工学院,四川成都610059

出　　处：《矿物岩石》2024年第2期1-11,共11页Mineralogy and Petrology

基　　金：国家自然基金项目(批准号:41807357,42302127);四川省自然科学基金项目(编号:22NSFSC0191,22NSFSC3990);珠峰科学研究计划(项目编号:80000-2021ZF11419)。

摘　　要：磷矿开发、磷肥施用会引起表生水系中铀与磷酸盐浓度的升高。通过吸附试验,探讨了pH、总磷酸盐浓度、固液比和离子强度对富磷水体中铀在水一钠长石界面的吸附机制。研究结果表明:在总磷酸盐浓度为0.2mg/L、固液比为10g/L、离子强度为0.1mol/L、pH=4.0时,钠长石对铀吸附性最强,最大吸附百分比为95%;酸性条件下,相对于无磷酸盐溶液,磷酸盐溶液会增强钠长石对铀的吸附性;碱性条件下,磷酸盐浓度较低时,钠长石对铀吸附性强于无磷酸盐的溶液,但是磷酸盐浓度较高时,钠长石对铀吸附性弱于无磷酸盐的溶液。不同NaCl浓度条件下的吸附实验表明,当2<pH<4,离子强度变化对吸附性影响微弱,当4<pH<11,离子强度的增大可明显提高钠长石对铀的吸附性。不同固液比条件下的吸附实验表明,当2<pH<4,钠长石对铀吸附性随固液比的增大而增大;当4<pH<11,钠长石对铀的吸附性并不随固液比的增大而提高,固液比10g/L时,反而吸附性最强。本研究结果不仅对理解富磷水体中铀迁移性转化性质具有重要的科学意义,而且对于磷矿铀污染具有重要参考价值。The paper investigates the adsorption mechanism of uranium in phosphorus-rich water at the water-albite interface,focusing on the influence of pH value,total phosphate concentration,solid-liquid ratio,and ionic strength through adsorption experiments.The findings are as follows:the strongest ad-sorption of uranium by albitite occurs when the total phosphate concentration is O.2 mg/L,the solid-liquid ratio is 10 g/L,the ionic strength is 0.1 mol/L,and the pH is 4.O,with a maximum adsorption percent-age of 95%.In acidic conditions,phosphate solution enhances uranium adsorption to albite compared to a phosphate-free solution.Conversely,under alkaline conditions,when phosphate concentration is low,ura-nium adsorption by albite is stronger than in the absence of phosphate.However,at high phosphate con-centrations,uranium adsorption by albite weakens.At pH values between 2 and 4,changes in ionic strength minimally affect uranium adsorption.In contrast,at pH values between 4 and 1l,increasing ion-ic strength significantly improves albite's adsorption capacity for uranium.Albite's adsorption of uranium increases with the solid-liquid ratio when pH is less than 4 or less than 2.However,at pH values between 4 and 1l,the adsorption capacity reaches its peak at a solid-liquid ratio of 10 g/L.These findings not only contribute to understanding uranium migration and transformation in phosphorus-rich water bodies but al-so provide valuable insights into addressing uranium pollution in phosphate ores.

关 键 词：富磷水体 钠长石 吸附 铀赋存形态 

分 类 号：X522[环境科学与工程—环境工程] X591