摘要
采用溶剂热法首次合成了新型钇锆双金属有机框架(YZr-MOF)吸附材料,并对其结构和表面性质进行了表征,研究了YZr-MOF对有机膦阻垢剂羟基亚乙基二膦酸(HEDP)的吸附行为和性质。实验结果表明,YZr-MOF呈现出大小均匀的球形颗粒结构,比表面积为912.862 m^(2)/g;在298 K时,YZr-MOF理论最大吸附量为66.293 mg/g(以P计)。吸附过程符合准二级动力学和Langmuir模型,吸附过程为吸热过程,温度升高有利于YZr-MOF吸附HEDP。在吸附实验中,YZr-MOF的最佳质量浓度为0.2 g/L;YZr-MOF在较宽的pH范围内有着良好的稳定性,并且经过6次循环后,仍保持显著的吸附率。结合相关实验和FTIR、XPS的表征结果表明,静电作用和配体交换为主要吸附机理。
A new yttrium zirconium bimetallic organic framework(YZr-MOF)adsorption material was synthesized by solvothermal method for the first time,and the structure and surface properties of adsorbents were characterized.Adsorption behavior and properties on organic phosphonate scale inhibitor 1-hydroxyethylidene-1,1-diphosphonic acid(HEDP)were investigated.Experimental results indicated that the structure of MOFs presented spherical particles of uniform size.The specific surface area of the adsorbent was 912.862 m^(2)/g.At 298 K,the theoretical maximum adsorption capacity of YZr-MOF was 66.293 mg/g(calculated in P).The adsorption process was fitted well with the pseudo-second-order kinetics equation and the Langmuir model.Moreover,the adsorption process was an endothermic process.The temperature rise was conducive to YZr-MOF adsorption of HEDP.In the adsorption experiments,the optimal amount of YZr-MOF was 0.2 g/L.YZr-MOF had good stability over a wide pH range and maintained a significant adsorption rate after six cycles.Combined with the relevant experiments and the characterization results of FTIR and XPS,electrostatic interaction and ligand exchange were the main adsorption mechanisms.
作者
刘登科
杨庆峰
刘阳桥
LIU Dengke;YANG Qingfeng;LIU Yangqiao(Center for Green Chemical Engineering Technology Research and Development,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China;University of Chinese Academy of Sciences,Beijing 100049,China;Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2024年第2期73-78,86,共7页
Industrial Water Treatment
基金
国家自然科学基金项目(51878647)。
关键词
金属有机框架
有机膦阻垢剂
吸附
配体交换
metal organic framework
organic phosphonate scale inhibitor
adsorption
ligand exchange