摘要
以γ-Al_2O_3为前驱体,利用原位生长及氧化还原法合成了MnO_2-Al_2O_3吸附剂。研究了MnO_2-Al_2O_3对氟离子的吸附选择性、循环利用性及除氟机理。结果表明,阴离子对MnO_2-Al_2O_3除氟率的影响大小顺序为PO43->Cl->SO42->NO3->HCO3-;MnO_2-Al_2O_3经5次吸脱附之后其除氟率下降至15.01%,循环利用性能有待进一步提高;吸附机理与吸附剂表面的zeta电位有关,主要包括静电吸引、配体交换和离子交换作用。
MnO2-Al2O3 was successfully fabricated using the in-situ growth and redox technology with gamma-alumina as a precursor.The adsorption selectivity,recycling performance,and adsorption mechanism towards fluoride ions were systematically studied.The results showed that some anions had significant effect on the fluoride removal,and the influence order was PO43-Cl-SO42-NO3-HCO3-.The fluoride removal rate fell to 15.01% after five adsorption and desorption cycles,which indicated the recycling utilization performance of MnO2-Al2O3 was needed to be further improved.The value of zeta potential of MnO2-Al2O3 had significant effect on the fluoride removal,and the adsorption mechanism mainly included the electrostatic attraction,ligand exchange and ion exchange actions.
出处
《无机盐工业》
CAS
北大核心
2017年第10期19-21,41,共4页
Inorganic Chemicals Industry
基金
国家自然科学基金项目(21557001
U1607105)
