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玻璃纖維濾膜基納米鈦酸鍶鋇的制備及其對(duì)Cd2+吸附行為
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遼寧省自然科學(xué)基金（81664）


Preparation of Strontium-Barium Titanate Based on Glass Fiber Filter and Its Adsorption Behavior for Cadmium Ion
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    摘要:

    采用檸檬酸絡(luò)合溶膠-凝膠法制備玻璃纖維濾膜基納米鈦酸鍶鋇（BBST），用X射線衍射（XRD）、掃描電鏡（SEM）和傅里葉變換紅外光譜（FTIR）進(jìn)行表征。并系統(tǒng)地研究玻璃纖維濾膜基鈦酸鍶鋇對(duì)水中Cd2+吸附行為。結(jié)果表明，納米鈦酸鍶鋇通過Si-O-Ti和B-O-Ti鍵與玻璃纖維濾膜結(jié)合，成為新型多孔塊體吸附劑。當(dāng)介質(zhì)的pH值為4~8時(shí)，該吸附劑對(duì)水中的Cd2+具有很強(qiáng)的吸附能力，吸附容量為9.8 mg·g-1；其吸附行為符合Freundlich吸附等溫模型和HO準(zhǔn)二級(jí)動(dòng)力學(xué)方程式，吸附過程焓變（△H）為17.241 kJ·mol-1，各溫度下的自由能變（△G）均小于零，熵變（△S）均為正值，該吸附過程是自發(fā)的吸熱物理過程。

    Abstract:

    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.

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張 東,袁志剛,關(guān) 欣,張文杰.玻璃纖維濾膜基納米鈦酸鍶鋇的制備及其對(duì)Cd2+吸附行為[J].稀有金屬材料與工程,2009,38(12):2207~2211.[Zhang Dong, Yuan Zhigang, Guan Xin, Zhang Wenjie. Preparation of Strontium-Barium Titanate Based on Glass Fiber Filter and Its Adsorption Behavior for Cadmium Ion[J]. Rare Metal Materials and Engineering,2009,38(12):2207~2211.]
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  • 收稿日期:2008-11-24
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