Adsorption recovery of phosphate from aqueous solution by CaO-biochar composites prepared from eggshell and rice straw

The Science of the Total Environment
Xiaoning LiuXinhua Qi

Abstract

CaO-biochar composites were prepared by mixed ball milling and pyrolysis of agricultural wastes eggshell and rice straw. The resulting CaO-biochar composites (E-C) showed excellent performance for phosphate adsorption from aqueous solution in a wide range of solution pH (5-11), and a maximum adsorption capacity of 231 mg/g could be obtained by E-C sample that was prepared from the eggshell and rice straw with a mass ratio of 1:1 (E-C 1:1). The adsorption of phosphate onto the E-C samples could be well described by pseudo-second-order (R2 > 0.975) and Langmuir models (R2 > 0.979). Thermodynamic analysis revealed that the adsorption process was spontaneous (ΔG0 < 0) and endothermic (ΔH0 > 0). This work provides a promising method to prepare functionalized biochar adsorbents from agricultural wastes for the recovery of phosphate from aqueous solution, and the phosphate adsorbed CaO-biochar composites can be directly applied as a slow-release fertilizer to farmland soil, which have the functions of improving soil physical structure, increasing soil fertility, and regulating soil pH.

Citations

Jan 9, 2019·Environmental Science and Pollution Research International·Mingyang Song, Min Li
May 16, 2020·Environmental Science and Pollution Research International·Zhaoran ZhangLiangguo Yan
Apr 24, 2021·The Science of the Total Environment·Aruna YadavSurender Kumar
Jun 6, 2021·Journal of Contaminant Hydrology·Maíra Luane S de AlmeidaTereza S M Santos
Jul 28, 2021·Scientific Reports·Nongnuch LaohavisutiSomkiat Seesanong

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