Quantitative Measurement on Removal Mechanisms of Phosphate by Class-F Fly Ash

被引：18
|
作者：
Kim, Kyeongmin [1 ]
Kim, Kyunghoi [1 ]
Asaoka, Satoshi [2 ]
Lee, In-Cheol [1 ]
Kim, Dong-Sun [3 ]
Hayakawa, Shinjiro [4 ]
机构：
[1] Pukyong Natl Univ, Dept Ocean Engn, Busan, South Korea
[2] Kobe Univ, Res Ctr Inland Seas, Kobe, Hyogo, Japan
[3] Pukyong Natl Univ, Dept Ecol Engn, Busan, South Korea
[4] Hiroshima Univ, Grad Sch Engn, Higashihiroshima, Japan
来源：
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION | 2020年 / 40卷 / 12期
基金：
新加坡国家研究基金会;
关键词：
Adsorption; coal fly ash; phosphate; precipitation; relative contribution; AQUEOUS-SOLUTION; SORPTION; HYDROXYAPATITE; TRANSFORMATION; STRENGTH; IONS;
D O I：
10.1080/19392699.2018.1428192
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
The role of Class-F fly ash in the removal of phosphate from aqueous solutions and the removal mechanism were quantitatively investigated. The relative contributions of precipitation and adsorption with various pH conditions showed that precipitation was predominant under alkaline conditions, whereas adsorption was effective under acidic conditions. The precipitation accounted for 79% of the total phosphate removal without adjusting the pH of the solution. This result suggests that the phosphate was predominantly removed by precipitation with fly ash, and that adsorption on hydroxylated oxides may have contributed to the removal of phosphate. The precipitate was revealed to be calcium hydrogen phosphate (CaHPO4) from X-ray absorption fine structure analysis. The adsorption process was expressed well by the Freundlich isotherm and phosphate adsorption by fly ash is favorable (n = 1.308).
引用
收藏
页码：892 / 903
页数：12
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