CTAB改性铁柱撑膨润土的制备及其对废水中低浓度铀(Ⅵ)的吸附性能研究  

Preparation of Iron-pillared Montmorillonite Modified with CTAB and Its AdsorptionProperties for Uranium(Ⅵ) Adsorption from Low-concentration Wastewater

作　　者：张泽雨 周仲魁[1,2] 张益硕 李龙祥 ZHANG Zeyu;ZHOU Zhongkui;ZHANG Yishuo;LI Longxiang(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;School of Water Resources and Environmental Engineering,East China University of Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学核资源与环境国家重点实验室,江西南昌330013 [2]东华理工大学水资源与环境工程学院,江西南昌330013

出　　处：《湿法冶金》2023年第5期522-531,共10页Hydrometallurgy of China

基　　金：国家自然科学基金资助项目(41662024);江西省重点研发计划重点项目(20212BBG71011);东华理工大学研究生创新基金资助项目(YC2020-S503,YC2022-s614)。

摘　　要：研究了用CTAB改性铁柱撑膨润土制备CTAB-Fe-BNT吸附材料,并用于吸附废水中低浓度铀。采用SEM、XRD、BET、FT-IR表征了CTAB-Fe-BNT形貌、物相、比表面积及官能团,考察了溶液pH、温度、CTAB-Fe-BNT用量和吸附时间对吸附铀的影响,探讨了吸附动力学、热力学及吸附机制。结果表明:针对质量浓度10 mg/L、体积50 mL的含铀废水,在溶液pH=7、CTAB-Fe-BNT用量1 g/L、反应时间60 min、温度25℃、振荡速度165 r/min最佳条件下,铀平均吸附率达94.2%,最大吸附量为710.1 mg/g;CTAB-Fe-BNT循环使用5次后,铀吸附率仍保持在92%左右;吸附过程以化学吸附为主。CTAB-Fe-BNT有望用于从废水中去除铀。CTAB-Fe-BNT adsorption material was prepared by CTAB modified iron columnar bentonite and used to adsorb low concentration uranium in wastewater.The morphology,phase,specific surface area and functional groups of CTAB-Fe-BNT were characterized by SEM,XRD,BET,FT-IR and XPS.The effects of pH,temperature,dosage of CTAB-Fe-BNT and adsorption time on the adsorption of uranium were investigated.The adsorption kinetics,thermodynamics and adsorption mechanism were also discussed.The results show that under the optimal conditions of solution pH=7,CTAB-Fe-BNT dosage of 1 g/L,reaction time of 60 min,temperature of 25℃and oscillation speed of 165 r/min,the average adsorption rate of uranium reaches 94.2%.The maximum adsorption capacity is 710.1 mg/g.After CTAB-Fe-BNT was used for 5 times,the adsorption rate of uranium remains at about 92%.The adsorption process is mainly chemical adsorption.CTAB-Fe-BNT is expected to be used to remove uranium from wastewater.

关 键 词：膨润土 铁柱撑 十六烷基三甲基溴化铵 复合改性 制备 吸附 铀 

分 类 号：TL212[核科学技术—核燃料循环与材料] TQ424[化学工程]