单宁酸铁和单宁酸亚铁对磷的吸附特性

doi:10.19677/j.issn.1004-7964.2020.05.002

皮革科学与工程 ›› 2020, Vol. 30 ›› Issue (5): 9-15.doi: 10.19677/j.issn.1004-7964.2020.05.002

单宁酸铁和单宁酸亚铁对磷的吸附特性

孙绪兵^1,2, 高天¹, 由耀辉^1,2,*

1.内江师范学院化学化工学院,四川内江 641100;
2.果类废弃物资源化四川省高等学校重点实验室,四川内江 641100

收稿日期:2020-06-02 上线日期:2020-09-25
通讯作者: *由耀辉（1986-）,男,教授,博士,allenyouyaohui@163.com;研究方向为生物质资源化利用与环境保护。
作者简介:孙绪兵(1982-),男,硕士,副教授,njtcsunxb@163.com;主要研究方向：天然产物及改性。
基金资助:
四川省科技厅应用基础项目(2019YJ0399)

Adsorption Characteristics of Ferric Tannate and Ferrous Tannate to Phosphorus

SUN Xubing^1,2, GAO Tian¹, YOU Yaohui^1,2,*

1. College of Chemistry and Chemical Engineering, Neijiang Normal University, Neijiang 641100, China;
2. Key Laboratory of Fruit Waste Treatment and Resource Recycling of the Sichuan Provincial Higher Learning Institutes, Neijiang Normal University, Neijiang 641100, China

Received:2020-06-02 Published:2020-09-25

摘要/Abstract

摘要： 以单宁酸、六水氯化铁和七水硫酸亚铁为原料,制备了单宁酸铁[TA-Fe(Ⅲ)]和单宁酸亚铁[TA-Fe(Ⅱ)]两种磷吸附剂。采用FTIR、XRD、SEM-EDS和XPS对TA-Fe(Ⅲ)和TA-Fe(Ⅱ)的结构、形貌和吸附机理进行了表征。结果表明,TA-Fe(Ⅲ)和TA-Fe(Ⅱ)对磷的吸附符合Pseudo-second-order动力学方程,以化学吸附为主;与Langmuir模型相比,Freundlich模型更加适合用描述TA-Fe(Ⅲ)和TA-Fe(Ⅱ)对磷的等温吸附过程;TA-Fe(Ⅲ)和TA-Fe(Ⅱ)对磷的吸附量受pH影响较大;pH=3时,Langmuir模型模拟的饱和吸附量分别为15.14 mg/g和18.88 mg/g;共存阴离子Cl^-、NO₃^-和SO₄^2-对吸附具有一定的负面影响。TA-Fe(Ⅲ)和TA-Fe(Ⅱ)吸附磷的机制是配体交换形成内层配合物为主,静电作用形成外层配合物为辅。

关键词: 单宁酸, 三价铁, 二价铁, 磷, 吸附

Abstract: Two kinds of phosphorous adsorbents, ferric tannate (TA-Fe(III)) and ferrous tannate (TA-Fe(II)), were synthesized by using tannic acid, ferric chloride hexahydrate and ferrous sulfate heptahydrate as starting materials. The structure, morphology and adsorption mechanism of TA-Fe(III) and TA-Fe(II) were characterized by FTIR, XRD, SEM-EDS and XPS. The results indicated that the kinetics data of phosphorus adsorption for TA-Fe(III) and TA-Fe(II) fitted well with the Pseudo-second-order kinetics equation, and compared to the Langmuir model, the Freundlich model was more suitable to describe the adsorption isotherm process of TA-Fe(III) and TA-Fe(II). The environmental pH could significantly affect the phosphorus adsorption capacities of TA-Fe(III) and TA-Fe(II), and at pH 3.0, the maximum absorption capacities calculated by Langmuir model were 15.14 mg/g for TA-Fe(III) and 18.88 mg/g for TA-Fe(II), respectively. Coexisting anions, including Cl^-、NO₃^- and SO₄^2-, had slightly negative effects on the phosphorus adsorption of both adsorbents. The main phosphorus adsorption mechanism of TA-Fe(III) and TA-Fe(II) was the ligand exchange to form inner-sphere complexes, while the electrostatic interaction to form outer complexes was supplemented.

Key words: tannic acid, ferric iron, ferrous iron, phosphorus, adsorption

中图分类号:

TQ351

孙绪兵, 高天, 由耀辉. 单宁酸铁和单宁酸亚铁对磷的吸附特性[J]. 皮革科学与工程, 2020, 30(5): 9-15.

SUN Xubing, GAO Tian, YOU Yaohui. Adsorption Characteristics of Ferric Tannate and Ferrous Tannate to Phosphorus[J]. Leather Science and Engineering, 2020, 30(5): 9-15.

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单宁酸铁和单宁酸亚铁对磷的吸附特性

Adsorption Characteristics of Ferric Tannate and Ferrous Tannate to Phosphorus

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