<italic style="font-style: italic">In situ</italic> Fabrication of Hydroxyapatite/Chitosan Composite Adsorbent and Its Property for Defluorination

Jin-yun ZHAO; Rui-lai LIU; Jie XU; Shu-qiong LIU; Ji-lin MU; Jia-peng HU; Xing-ping FU; Mei-zheng JIANG

doi:10.14028/j.cnki.1003-3726.2021.02.007

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In situ Fabrication of Hydroxyapatite/Chitosan Composite Adsorbent and Its Property for Defluorination

更新时间：2022-08-30

- In situ Fabrication of Hydroxyapatite/Chitosan Composite Adsorbent and Its Property for Defluorination
- Polymer Bulletin Vol. 34, Issue 2, Pages: 54-62(2021)
- 作者机构：
  
  1.福建省生态产业绿色技术重点实验室,武夷学院生态与资源工程学院,武夷山 354300
  2.福建师范大学材料科学与工程学院,福州 350007
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2021.02.007
  CLC：
- Published：20 February 2021，
  
  Received：16 December 2019，
  
  Revised：17 December 2020，
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Jin-yun ZHAO, Rui-lai LIU, Jie XU, Shu-qiong LIU, Ji-lin MU, Jia-peng HU, Xing-ping FU, Mei-zheng JIANG. In situ Fabrication of Hydroxyapatite/Chitosan Composite Adsorbent and Its Property for Defluorination. [J]. Polymer Bulletin 34(2):54-62(2021)
DOI：

Jin-yun ZHAO, Rui-lai LIU, Jie XU, Shu-qiong LIU, Ji-lin MU, Jia-peng HU, Xing-ping FU, Mei-zheng JIANG. In situ Fabrication of Hydroxyapatite/Chitosan Composite Adsorbent and Its Property for Defluorination. [J]. Polymer Bulletin 34(2):54-62(2021) DOI： 10.14028/j.cnki.1003-3726.2021.02.007.

摘要

利用原位共沉淀法合成了羟基磷灰石/壳聚糖复合吸附剂

通过扫描电镜、X 射线粉末衍射、红外光谱和N

吸附-脱附曲线

研究复合前后羟基磷灰石的理化特征变化。实验结果表明与壳聚糖复合后羟基磷灰石的晶型并没有改变

只是结晶度有所降低

且复合后表面形成了不规则的凹凸结构

表面粗糙度增加。比表面积从106.75m

/g增加到127.58m

/g。复合吸附剂孔径大部分集中在10~50nm

属于介孔结构。利用Langmuir和Freundlich吸附等温方程对实验数据进行了拟合

对比相关系数

值

Langmuir模型能更好地描述该吸附过程。复合吸附剂对氟离子的吸附符合拟二级反应动力学方程。计算了吸附热力学和动力学参数值

探讨了复合吸附剂对氟离子的吸附机理。Δ

0、Δ

0和Δ

说明复合吸附剂对氟离子的吸附是自发的、吸热的熵增过程

温度升高有利于吸附。吸附活化能(

)=15.03kJ·mol

-1

迁移能(

)=7.639kJ·mol

-1

说明该吸附过程以物理吸附为主。

Abstract

Hydroxyapatite/chitosan (HAP/CS) composite adsorbent was prepared by the in-situ co-precipitation method. The physical and chemical characteristics of adsorbents with and without CS were characterized via SEM

XRD

and N2 adsorption-desorption isotherms. The results showed that crystal form of HAP has no change after composition

but the crystallinity was decreased. Moreover

the as-prepared composite has an irregular concave-convex structure with increased surface roughness. The specific surface areas also increased from 106.75m

/g to 127.58m

and the pore size of composite adsorbent was 10~50 nm

which belongs to mesoporous. Both models

including the Langmuir and the Freundlich

could predict the experimental data conducted. However

the Langmuir model had a better correlation coefficient than the Freundlich model. The kinetic adsorption data showed that the adsorption process follows the pseudosecond- order kinetic. The thermodynamic and kinetics parameters were obtained. Δ

0、Δ

0 and Δ

0 indicated that the adsorption was a spontaneous and endothermic process with increased entropy

and a higher temperature would benefit the adsorption. The adsorption's activation energy (

)=15.03kJ·mol

-1

and migration energy (

)=7.639kJ/mol indicated that the adsorption was mainly physical.

关键词

羟基磷灰石壳聚糖除氟吸附剂

Keywords

HydroxyapatiteChitosanDefluoridationAdsorbent

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⁰

In situ Fabrication of Hydroxyapatite/Chitosan Composite Adsorbent and Its Property for Defluorination

DOI：10.14028/j.cnki.1003-3726.2021.02.007

摘要

Abstract

关键词

Keywords

references