HCl/H2SO4改性粉煤灰的制备及其吸附性能

doi:10.16085/j.issn.1000-6613.2017.06.052

化工进展 ›› 2017, Vol. 36 ›› Issue (06): 2331-2336.DOI: 10.16085/j.issn.1000-6613.2017.06.052

• 资源与环境化工 • 上一篇

HCl/H₂SO₄改性粉煤灰的制备及其吸附性能

贾艳萍, 姜修平, 张兰河, 张海丰, 王嵬, 陈子成

东北电力大学化学工程学院, 吉林吉林 132012

收稿日期:2017-01-19 修回日期:2017-02-17 出版日期:2017-06-05 发布日期:2017-06-05
通讯作者: 张兰河
作者简介:贾艳萍(1973—),女,博士,副教授,主要从事废水及废气的生物处理理论与工艺研究。E-mail:jiayanping1111@sina.com。
基金资助:
国家自然科学基金（51678119）及吉林省科技发展计划（20150204052SF，20160101268JC，20150519020JH，20160101295JC）项目。

Fly ash modified by HCl/H₂SO₄and their adsorption capacity

JIA Yanping, JIANG Xiuping, ZHANG Lanhe, ZHANG Haifeng, WANG Wei, CHEN Zicheng

School of Chemical Engineering, Northeast Electric Power University, Jilin 132012, Jilin, China

Received:2017-01-19 Revised:2017-02-17 Online:2017-06-05 Published:2017-06-05

摘要/Abstract

摘要： 粉煤灰作为一种工业废弃物，具有来源广泛、孔隙率高、比表面积大等特点被用于废水处理。本研究利用1mol/L的混酸对粉煤灰进行改性，通过扫描电子显微镜（SEM）、X射线衍射（XRD）、傅里叶转换红外分析（FTIR）分析粉煤灰改性前后的形貌和成分变化，再采用改性粉煤灰处理模拟染料废水探讨其吸附性能的变化。结果表明：粉煤灰改性后表面形成大量凹槽、孔洞，粗糙度和吸附空穴增加。当粉煤灰投加量为15g/L，初始pH为6～8，水温为30℃，搅拌时间为45min时，染料废水的污染物去除率最高，COD去除率为64%，氨氮去除率为38%，脱色率为84%。此外，改性粉煤灰吸附模拟染料废水的过程主要是单分子吸附，符合Langmuir吸附等温模型，该吸附过程是自发进行的放热反应，经改性粉煤灰处理后的模拟废水体系的混乱度减小。

关键词: 改性粉煤灰, 废水处理, 吸附作用, 热力学性质

Abstract: As an industrial waste,fly ash was used in wastewater treatment because of abundance,high porosity structure and large specific surface area. In this study,fly ash was modified using 1mol/L of mixed acid. The morphology and composition were characterized by Scanning Electron Microscope(SEM),X-ray Diffraction(XRD)and Fourier Transform Infrared Spectroscopy(FTIR)before and after the fly ash was modified. Furthermore,simulated dye wastewater was treated by the modified fly ash to study the adsorption capacity of modified fly ash. The results showed that the surface of modified fly ash formed a large number of grooves and holes so the roughness and adsorption void were increased. The removal efficiency of contaminants in the dye wastewater was the highest under the conditions of modified fly ash 15g/L,reaction time 45min,pH 6—8,and temperature 30℃. The removal efficiencies of COD and NH₄⁺-N were 64% and 38%,respectively. And decolorization efficiency was 84%. In addition,the adsorption isotherms of simulated dye wastewater were compatible with the mechanism of monolayer adsorption and fit with Langmuir adsorption isotherms model. The adsorption process was a spontaneous and exothermic reaction,and the degree of disorder of the simulated wastewater treated by modified fly ash was reduced.

Key words: modified fly ash, wastewater treatment, adsorption, thermodynamic properties

中图分类号:

X703.1

贾艳萍, 姜修平, 张兰河, 张海丰, 王嵬, 陈子成. HCl/H₂SO₄改性粉煤灰的制备及其吸附性能[J]. 化工进展, 2017, 36(06): 2331-2336.

JIA Yanping, JIANG Xiuping, ZHANG Lanhe, ZHANG Haifeng, WANG Wei, CHEN Zicheng. Fly ash modified by HCl/H₂SO₄and their adsorption capacity[J]. Chemical Industry and Engineering Progress, 2017, 36(06): 2331-2336.

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HCl/H₂SO₄改性粉煤灰的制备及其吸附性能

Fly ash modified by HCl/H₂SO₄and their adsorption capacity

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