多级多孔硅酸镍微球的合成及其对碱性品红的高效吸附  

Synthesis of Hierarchical Porous Nickel Phyllosilicate Microspheres as Efficient Adsorbents for Removal of Basic Fuchsin

作　　者：王婷婷[1] 史书梅 柳晨媛 朱万诚[1] 张恒[1] WANG Tingting;SHI Shumei;LIU Chenyuan;ZHU Wancheng;ZHANG Heng(School of Chemistry and Chemical Engineering,Qufu Normal University,Qufu 273165,China)

机构地区：[1]曲阜师范大学化学与化工学院,曲阜273165

出　　处：《无机材料学报》2021年第12期1330-1336,I0007,I0008,共9页Journal of Inorganic Materials

基　　金：Natural Science Foundation of Shandong Province(ZR2018MB033);Undergraduate Training Program for Innovation and Entrepreneurship of Shandong Province(S201910446015)。

摘　　要：层状硅酸镍因其独特的结构,在电化学和催化等领域展现出良好的应用前景,其合成与性能研究近年来受到广泛关注。本研究以氯化镍和正硅酸乙酯为原料,采用水热法合成了硅酸镍微球,并详细探究了镍硅比和碱源对产物组成、形貌及孔结构的影响。在优化条件下,产物呈现由纳米片组装的、平均直径约为2.5μm的微球形貌,比表面积为119.6 m^(2);·g^(-1),孔容为0.673cm^(3)·g^(-1)。Zeta电位分析表明,该微球在pH=3~10范围内保持表面电负性。将硅酸镍微球用于处理碱性品红溶液,吸附过程符合准二级动力学模型。在初始浓度为50mg·L^(-1)的条件下,吸附容量可达120.7 mg·g^(-1),脱除率达96.6%,远优于改性粘土及近年来报道的多种材料。吸附量与平衡浓度的数据表明,碱性品红在硅酸镍微球上的吸附符合Freundlich吸附模型, 1/n=0.1678,表明该吸附为多层非均相吸附且吸附作用力强。Nickel phyllosilicates have shown considerable potential in many fields such as electrochemistry and catalysis owing to their specific structures, attracting a great attention on preparation and properties of them in recent years. In this study, Ni;Si;O;(OH);microspheres were synthesized via a hydrothermal method by using NiCl;and tetraethyl orthosilicate(TEOS) as the raw materials. Effects of Ni/Si molar ratio and alkali source on the phase composition, morphology and textural property of the products were investigated. Under optimized conditions, the as-synthesized Ni;Si;O;(OH);microspheres presented a nanosheets-assembled morphology with an average diameter of ca. 2.5 μm, SBET of 119.6 m;·g;, pore volume of 0.673 cm;·g;, and Zeta potential measurements showed that they were negatively charged with pH ranging from 3 to 10. When employed as the adsorbents for basic fuchsin(BF), the Ni;Si;O;(OH);microspheres showed an adsorption capacity of 120.7 mg·g;with the removal efficiency up to 96.6% from 50 mg·L;solution, superior to most of the referred adsorbents in literatures, and the adsorption kinetic data can be well interpretated via the pseudo-second-order model. Data of the relationship between equilibrium adsorption capacity and BF concentration were well fitted by Freundlich isotherm model with the 1/n value of 0.1678, indicating that the surface was heterogeneous and the adsorption strength was strong.

关 键 词：硅酸镍 水热合成 染料去除 吸附 碱性品红 

分 类 号：TQ424[化学工程]