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Study on the phosphate removal from aqueous solution using modified fly ash
Xu, Ke1; Deng, Tong2; Liu, Juntan1; Peng, Weigong1; Xu, K
2010-12-01
Source PublicationFUEL
ISSN0016-2361
Volume89Issue:12Pages:3668-3674
AbstractIn this work the fly ash was modified by sulfuric acid for the removal of phosphate. It was found that modification of fly ash could significantly enhance the phosphate immobilization ability of the fly ash. The specific surface area of the fly ash increased from 8.8 to 32.5 m(2)/g after treated with sulfuric acid. The modification of the fly ash also resulted in the mobilization of acid-soluble metal ions due to partial or complete dissolution of the metals under the acidic conditions. Both adsorption and precipitation contributed to the removal of phosphate by the modified fly ash but precipitation was a major mechanism of phosphate removal. The experimental results showed that adsorption of phosphate by the modified fly ash was rapid, the removal percentage of phosphate could reach maximum in 5 min. In the range of 5-9, pH did not significantly affect the removal of phosphate and the removal percentage of phosphate increased with the increase of adsorbent dosage. The adsorption of phosphate by the modified fly ash could be described well by Langmuir isotherm equation, the Langmuir constant Q(0) was 9.15 mg g (1). The XRD patterns and the SEM images of modified fly ash after sorption revealed that CaHPO(4)center dot 2H(2)O was formed in the removal of phosphate. In addition, phosphate also formed precipitate with aluminum and iron. (C) 2010 Elsevier Ltd. All rights reserved.
KeywordFly Ash Modification Sulfuric Acid Phosphate Removal
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.fuel.2010.07.034
Indexed BySCI
Language英语
WOS KeywordCONSTRUCTED WETLAND SYSTEMS ; IMMOBILIZATION ; SLAG
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Chemical
WOS IDWOS:000282086200009
Citation statistics
Cited Times:45[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/5559
Collection湿法冶金清洁生产技术国家工程实验室
Corresponding AuthorXu, K
Affiliation1.Zhengzhou Inst Aeronaut Ind Management, Zhengzhou 450015, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Xu, Ke,Deng, Tong,Liu, Juntan,et al. Study on the phosphate removal from aqueous solution using modified fly ash[J]. FUEL,2010,89(12):3668-3674.
APA Xu, Ke,Deng, Tong,Liu, Juntan,Peng, Weigong,&Xu, K.(2010).Study on the phosphate removal from aqueous solution using modified fly ash.FUEL,89(12),3668-3674.
MLA Xu, Ke,et al."Study on the phosphate removal from aqueous solution using modified fly ash".FUEL 89.12(2010):3668-3674.
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