铌酸盐负载钛酸纳米片对水中Pb(Ⅱ)和Cu(Ⅱ)的吸附研究Adsorption of Pb(Ⅱ) and Cu(Ⅱ) in Water by Niobate Modified Titanate Nanoflakes
隋睿,刘晓娜,杨改强,霍丽娟,丁庆伟
摘要(Abstract):
钛酸纳米材料具有均一的结构、组成以及独特的物理化学性质,在水处理重金属领域中显示出良好的应用前景。本研究采用一步水热法合成了铌酸盐负载钛酸纳米片(Nb/TiNFs),并研究了Pb(Ⅱ)和Cu(Ⅱ)在其上的单组分以及复合体系中竞争吸附。XRD、TEM和SEM等证实材料为纳米片状结构,主要晶相为三钛酸盐。Nb/TiNFs对Pb(Ⅱ)和Cu(Ⅱ)显示出快速的吸附动力学和高吸附容量,具体机制为金属阳离子与层间-ONa/H基团的离子交换。吸附等温符合Langmuir模型,理论最大吸附量Pb(Ⅱ)(2.474 mmol·g~(-1))> Cu(Ⅱ)(1.876 mmol·g~(-1)).在两种金属离子共存的体系中,金属离子间存在竞争吸附,竞争能力Pb(Ⅱ)> Cu(Ⅱ),主要由于为Pb(Ⅱ)的水合能较小,容易解离为自由离子在Nb/TiNFs上进行离子交换。由于Nb/TiNFs具有高效去除复杂体系污水中金属阳离子且合成简易等优点,为处理多种重金属污染废水领域提供了可选途径。
关键词(KeyWords): Nb/TiNFs;竞争吸附;Pb(Ⅱ);Cu(Ⅱ)
基金项目(Foundation): 国家自然科学基金(41807130,51709195);; 山西省重点研发计划(201903D121085)
作者(Author): 隋睿,刘晓娜,杨改强,霍丽娟,丁庆伟
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