摘要
通过简单的交联法制备了Cu(Ⅱ)交联羧甲基纤维素水凝胶(CMC-Cu)和以聚乙二醇(PEG)为造孔剂的Cu(Ⅱ)交联羧甲基纤维素水凝胶(CMC-Cu-PEG),并用于水溶液中铀酰离子(U)的去除.采用扫描电子显微镜(SEM)、X-射线粉末衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)、X-射线光电子能谱(XPS)等技术对材料的形貌和结构进行了表征.实验结果表明,两种材料对铀酰离子均具有较好的吸附效果,吸附过程以单分子层吸附为主.25℃条件下,CMC-Cu和CMC-Cu-PEG对铀酰离子的最大吸附量分别为331.8 mg·g^(-1)和558.1 mg·g^(-1).热力学结果表明,两种材料对铀酰离子的吸附是自发进行的,温度升高有利于吸附反应.
In this study,Cu(II)crosslinked carboxymethyl cellulose hydrogels(CMC-Cu)and their modified counterparts,CMC-Cu-PEG,using polyethylene glycol(PEG)as pore-forming agent were prepared by a simple crosslinking method.The obtained hydrogels were used to remove uranyl ions(U)from aqueous solutions.The morphology and structure of the materials were characterized by multiple technologies,including scanning electron microscopy(SEM),X-ray powder diffractometer(XRD),Fourier transform infrared spectrometer(FT-IR)and X-ray photoelectron spectroscopy(XPS).The results showed that the materials had excellent removal capacity for U and the adsorption processes were mainly monolayer adsorption.The maximum adsorption capacities of CMC-Cu and CMC-Cu-PEG for U reached 331.8 mg·g^(-1) and 558.1 mg·g^(-1) at 25℃,respectively.Thermodynamic analysis results supported the spontaneous nature of U adsorption on both materials,revealing that the increase of temperature was beneficial to U adsorption.
作者
韩珊珊
陈元涛
张炜
荆永康
周昌友
王海洋
HAN Shanshan;CHEN Yuanta;ZHANG Wei;JING Yongkang;ZHOU Changyou;WANG Haiyang(College of Chemistry and Chemical Engineering,Qinghai Normal University,Xining 810008)
出处
《环境科学学报》
CAS
CSCD
北大核心
2024年第3期83-94,共12页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.22266027)。
关键词
铜
水凝胶
铀酰离子
吸附
copper
hydrogel
uranyl ion
adsorption
