EXAFS studies on particle concentration effect and adsorption reversibility of Zn（Ⅱ） onto anatase TiO<sub>2</sub>

LI Wei PAN Gang CHEN Hao ZHANG Meiyi HE Guangzhi YANG Yuhuan

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EXAFS studies on particle concentration effect and adsorption reversibility of Zn（Ⅱ） onto anatase TiO₂

更新时间：2021-03-12

- EXAFS studies on particle concentration effect and adsorption reversibility of Zn（Ⅱ） onto anatase TiO₂
- NUCLEAR TECHNIQUES Issue 3, (2007)
- 作者机构：
  
  1. 中国科学院生态环境研究中心环境水质学国家重点实验室
  2. 中国科学院生态环境研究中心环境水质学国家重点实验室,北京,100085
- 作者简介：
- 基金信息：
  
  国家自然科学基金项目(20073060);中国科学院优秀“百人计划”资助
- DOI：
  CLC： O614.411
- Published：01 March 2007
- 稿件说明：
移动端阅览
[1]李薇,潘纲,陈灏,张美一,何广智,杨玉环.用延展X射线精细结构吸收光谱研究Zn(Ⅱ)-TiO_2体系的颗粒物浓度效应和吸附可逆性[J].核技术,2007(03):165-170.

LI Wei PAN Gang CHEN Hao ZHANG Meiyi HE Guangzhi YANG Yuhuan. EXAFS studies on particle concentration effect and adsorption reversibility of Zn（Ⅱ） onto anatase TiO₂[J]. Nuclear techniques, 2007, (3): 165-170.
[1]李薇,潘纲,陈灏,张美一,何广智,杨玉环.用延展X射线精细结构吸收光谱研究Zn(Ⅱ)-TiO_2体系的颗粒物浓度效应和吸附可逆性[J].核技术,2007(03):165-170. DOI：

LI Wei PAN Gang CHEN Hao ZHANG Meiyi HE Guangzhi YANG Yuhuan. EXAFS studies on particle concentration effect and adsorption reversibility of Zn（Ⅱ） onto anatase TiO₂[J]. Nuclear techniques, 2007, (3): 165-170. DOI：

摘要

用延展X射线精细结构吸收光谱（EXAFS）研究了不同颗粒物浓度（Cp）下重金属Zn（Ⅱ）在锐钛型TiO2上吸附产物的微观构型

考察了Cp、吸附微观构型与可逆性的关系。宏观的吸附-解吸等温线结果表明

Zn（Ⅱ）-TiO2体系的吸附等温线随Cp的增加而显著降低

有明显的Cp效应;且吸附可逆性随Cp的增加逐渐减小。EXAFS结果表明

Zn（Ⅱ）主要是通过共用水合Zn（Ⅱ）离子及TiO2表面上的O原子结合到TiO2表面上

其平均Zn-O原子间距为（1.98±0.01）。同时

第二配位层（Zn-Ti层）的EXAFS图谱分析结果表明存在两个典型的Zn-Ti原子间距

即R1=（3.26±0.01）（边-边结合的强吸附）和R2=（3.70±0.01）（角-角结合的弱吸附）。吸附密度相近、平衡浓度不同的三个吸附样品

随Cp的增加

强吸附位（N1）基本不变而弱吸附位（N2）减少

两者比值（N1/N2）由0.629增加至0.690。该比值的变化从微观角度解释了宏观吸附-解吸实验中Cp增加

可逆性减小的实验现象。同时

EXAFS实验结果也从微观上证明了亚稳平衡态吸附理论（MEA理论）的吸附密度（Γ）不是状态函数的基本假设。

Abstract

Microscopic structures of Zn(Ⅱ) adsorbed onto anatase TiO2 under different particle concentrations(Cp) were studied using the extended X-ray absorption fine structure(EXAFS) spectroscopy.Results of macroscopic adsorption-desorption isotherms indicated that Cp effect was obvious in the adsorption system.Adsorption isotherms decreased substantially with increasing Cp

and reversibility also decreased.Quantitative analysis on the EXAFS spectra showed that Zn(Ⅱ) was adsorbed onto the solid surface in the form of octahedral hydrous Zn(Ⅱ) ions

which were linked to the TiO2 surface by sharing the oxygen atoms

with an average bond length of RZn-O =(1.98±0.01) .EXAFS analysis of the second sphere resulted in two Zn-Ti atomic distances of(3.26 ± 0.01)  and(3.70 ± 0.01) 

corresponding to edge-sharing linkage(stronger adsorption site) and corner-sharing linkage(weaker adsorption site) respectively.For three adsorption samples with the same adsorption density and different equilibrium concentration

the number of stronger adsorption sites(N1) remained relatively stable while the number of weaker adsorption sites(N2) decreased with increasing Cp

making the proportion of two adsorption modes(N1/N2) rise from 0.629 to 0.690.These EXAFS results revealed the microscopic mechanism behind the macroscopic adsorption-desorption isotherm experiments.At the same time the basic hypothesis of MEA theory that the adsorption density is not a state variable has been verified.

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Related Institution

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EXAFS studies on particle concentration effect and adsorption reversibility of Zn（Ⅱ） onto anatase TiO2

DOI：

摘要

Abstract

关键词

Keywords

references

EXAFS studies on particle concentration effect and adsorption reversibility of Zn（Ⅱ） onto anatase TiO₂