Phosphate adsorption ability of biochar/Mg-Al assembled nanocomposites prepared by aluminum-electrode based electro-assisted modification method with MgCl2 as electrolyte

被引：123

作者：

Jung, Kyung-Won ^{[1
]}

Jeong, Tae-Un ^{[1
]}

Hwang, Min-Jin ^{[2
]}

Kim, Kipal ^{[3
]}

Ahn, Kyu-Hong ^{[1
]}

机构：

[1] Korea Inst Sci & Technol, Ctr Water Resources Cycle Res, Seoul 130650, South Korea

[2] Korea Inst Toxicol, Future Environm Res Ctr, Jinju 660844, Gyeongsangnam D, South Korea

[3] KG Chem, Environm Business Team, R&D Div, Siheung Si 429848, Gyeonggi Do, South Korea

来源：

BIORESOURCE TECHNOLOGY | 2015年 / 198卷

关键词：

Modified-biochar; Mg-Al assembled nanocomposites; MgO; Spinel MgAl2O4; Kinetic analysis; PYROLYSIS TEMPERATURE; AQUEOUS-SOLUTIONS; REMOVAL; SORPTION; ADSORBENTS; RECOVERY; LIQUID; WATER; CA;

D O I：

10.1016/j.biortech.2015.09.068

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

In this work, the textural properties and phosphate adsorption capability of modified-biochar containing Mg-Al assembled nanocomposites prepared by an effective electro-assisted modification method with MgCl2 as an electrolyte have been determined. Structure and chemical analyses of the modified-biochar showed that nano-sized stonelike or flowerlike Mg-Al assembled composites, MgO, spinel MgAl2O4, AlOOH, and Al2O3, were densely grown and uniformly dispersed on the biochar surface. The adsorption isotherm and kinetics data suggested that the biochar/Mg-Al assembled nanocomposites have an energetically heterogeneous surface and that phosphate adsorption could be controlled by multiple processes. The maximum phosphate adsorption capacity was as high as 887 mg g(-1), as fitted by the Langmuir-Freundlich model, and is the highest value ever reported. It was concluded that this novel electro-assisted modification is a very attractive method and the biochar/Mg-Al assembled nanocomposites provide an excellent adsorbent that can effectively remove phosphate from aqueous solutions. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：603 / 610

页数：8