摘要
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。
Titanate nano-materials,which have uniform structure,composition and property,show great potential applications in wastewater treatment area.In this study,niobate modified titanate nanoflakes(Nb/TiNFs)were synthesized through hydrothermal method,then Pb(Ⅱ)and Cu(Ⅱ)were simultaneously removed from water.Characterization results showed that Nb/TiNFs were appeared as nanoflakes,tri-titanate was the primary crystal phase.Nb/TiNFs showed rapid adsorption kinetics and high adsorption capacity for both Pb(Ⅱ)and Cu(Ⅱ),which ion-exchange between metal and-ONa/H was the key mechanisms.According to Langmuir isotherm model,the maximum adsorption capacity of Pb(Ⅱ)(2.474 mmol·g^(-1))>Cu(Ⅱ)(1.876 mmol·g^(-1)).In binary system,Pb(Ⅱ)always shows strong competitiveness,even when Pb(Ⅱ)is at a concentration disadvantage.Due to the simple synthesis method of Nb/TiNFs and the efficient removal of metal cations in complex system wastewater,Nb/TiNFs should be a promising material in remediation of heavy metal multiple polluted water.
作者
隋睿
刘晓娜
杨改强
霍丽娟
丁庆伟
SUI Rui;LIU Xiao-na;YANG Gai-qiang;HUO Li-juan;DING Qing-wei(College of Environment and Safety,Taiyuan University of Science and Technology,Taiyuan 030024,China)
出处
《太原科技大学学报》
2022年第1期82-87,共6页
Journal of Taiyuan University of Science and Technology
基金
国家自然科学基金(41807130,51709195)
山西省重点研发计划(201903D121085)。
