Enhanced removal of triphosphate by MgCaFe-Cl-LDH: Synergism of precipitation with intercalation and surface uptake

被引：78

作者：

Zhou, Jizhi ^{[2
]}

Xu, Zhi Ping ^{[1
]}

Qiao, Shizhang ^{[1
]}

Liu, Qiang ^{[2
]}

Xu, Yunfeng ^{[2
]}

Qian, Guangren ^{[2
]}

机构：

[1] Univ Queensland, ARC Ctr Excellence Funct Nanomat, Australian Inst Bioengn & Nanotechnol, Brisbane, Qld 4072, Australia

[2] Shanghai Univ, Sch Environm & Chem Engn, Shanghai 200444, Peoples R China

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2011年 / 189卷 / 1-2期

基金：

澳大利亚研究理事会;

关键词：

Triphosphate; Layered double hydroxide (LDH); Intercalation; Dissolution; Precipitation; LAYERED DOUBLE HYDROXIDES; ION-EXCHANGE; FRIEDEL PHASE; PHOSPHATE; ADSORPTION; TRIPOLYPHOSPHATE; HYDROLYSIS; ANIONS; SYSTEM; WATER;

D O I：

10.1016/j.jhazmat.2011.02.078

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Triphosphate (TPP) is an important form of phosphate pollutants while its removal investigation has been just started now. This research examined the removal of triphosphate using Mg(2-x)Ca(x)FeCl-LDH (x = 0-2) as absorbents. We found that the removal of triphosphate over Mg(2)FeCl-LDH mainly underwent the surface adsorption and the near-edge intercalation, with the practical removal amount (9-11 mg(P)/g) corresponding to 10-15% of the theoretical one. In contrast, Ca(2)FeCl-LDH removed a higher amount of triphosphate (56.4 mg(P)/g). The comprehensive analysis of the triphosphate-uptake products with XRD/XPS/FTIR reveals that Ca(2)FeCl-LDH dissolves first and then released Ca(2+) ions react with triphosphate (TPP) to form insoluble Ca-TPP precipitate. Combination of these two different removal mechanisms enables Mg(0.5)Ca(1.5)FeCl-LDH to take up 84.2 mg(P)/g from aqueous solution under similar conditions. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：586 / 594

页数：9

共 31 条

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