摘要
采用柠檬酸络合溶胶-凝胶法制备玻璃纤维滤膜基纳米钛酸锶钡(BBST),用X射线衍射(XRD)、扫描电镜(SEM)和傅里叶变换红外光谱(FTIR)进行表征。并系统地研究玻璃纤维滤膜基钛酸锶钡对水中Cd2+吸附行为。结果表明,纳米钛酸锶钡通过Si-O-Ti和B-O-Ti键与玻璃纤维滤膜结合,成为新型多孔块体吸附剂。当介质的pH值为4~8时,该吸附剂对水中的Cd2+具有很强的吸附能力,吸附容量为9.8mg·g-1;其吸附行为符合Freundlich吸附等温模型和HO准二级动力学方程式,吸附过程焓变(△H)为17.241kJ·mol-1,各温度下的自由能变(△G)均小于零,熵变(△S)均为正值,该吸附过程是自发的吸热物理过程。
Strontium-barium titanate based on glass fiber filter （BBST） was prepared by the citrate acid complex sol-gel method and characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM） and fourier transform infrared spectrophotometer （FT-IR）. The adsorption behavior of BBST for cadmium ion in distilled water was investigated. The results show that the strontium-barium titanate could bond with glass fiber filter through Si-O-Ti and B-O-Ti bonding to produce a new sort of porous block adsorbent. The cadmium ion could be quantitatively retained in the medium with pH value range of 4-8, and the capacity of adsorption was 9.8 mg.g^-1. The adsorption behavior followed Freundlich adsorption isotherm model and HO pseudo-second-order kinetic equation. The enthalpy changes （△H） of the adsorption process was 17.241 kJ·mol^-1. At various temperatures, Gibbs free energy changes （△G） were negative, and entropy changes （△S） were positive. These showed that the adsorption of cadmium ion by BBST was endothermic and spontaneous physical process.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2009年第12期2207-2211,共5页
Rare Metal Materials and Engineering
基金
辽宁省自然科学基金(81664)
关键词
钛酸锶钡
玻璃纤维滤膜
吸附行为
Cd2+
strontium-barium titanate
glass fiber filter
adsorption behavior
cadmium ion
