Preparation of amino-functionalized fly ash based tobermorite for enhanced removal of Cr(VI)

被引：11

作者：

Wang, Zehua ^{[1
]}

Xu, Linhao ^{[1
]}

Su, Ningning ^{[1
]}

Zhu, Shuhan ^{[1
]}

Wu, Daishe ^{[1
,2
]}

机构：

[1] Nanchang Univ, Sch Resources & Environm, Key Lab Poyang Lake Environm & Resource Utilizat, Minist Educ, Nanchang 330031, Peoples R China

[2] Pingxiang Univ, Sch Mat & Chem Engn, Pingxiang 337000, Peoples R China

来源：

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH | 2023年 / 30卷 / 19期

基金：

中国国家自然科学基金;

关键词：

Cr(VI); Adsorption; Amino-functionalization; Fly ash; Tobermorite; HEAVY-METAL IONS; AQUEOUS-SOLUTIONS; ADSORPTION; EQUILIBRIUM; ADSORBENT; ALUMINA; CHROMIUM; CHROMATE; PB(II); SILICA;

D O I：

10.1007/s11356-023-26269-x

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Amino-functionalized fly ash based tobermorite (NH2-FAT) was prepared via a two-step process including a hydrothermal preparation of fly ash based tobermorite (FAT) from fly ash (FA) and the impregnation of 3-aminopropyltriethoxysilane (APTES). The characteristics of FA, FAT, and NH2-FAT were systematically measured. The removal capacity of Cr(VI) by FAT and NH2-FAT were comparatively studied. The results indicated that the NH2-FAT presented excellent removal efficiency towards Cr(VI) in the condition of pH of 2. The adsorption capacity of Cr(VI) by NH2-FAT in this study was up to 498.39 mg/g resulted from Langmuir model, which was more superior to that of FAT, other reported FA based adsorbents and most amino-functionalized adsorbents. Furthermore, the removal mechanisms of Cr(VI) by NH2-FAT were ascribed to both electrostatic attraction and reduction to Cr(III) by amino groups. Overall, this work indicates the NH2-FAT is a promising adsorbent for treating wastewater containing Cr(VI), and provides a new utilization method of FA.

引用

页码：54547 / 54555

页数：9

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