Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 666, Issue -, Pages 694-702Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.02.227
Keywords
Biomass; Eutrophication; Adsorbent; Agricultural wastes; Fertilizer
Categories
Funding
- National Key Research and Development Program of China [2017YFD0800103]
- Natural Science Fund for Distinguished Young Scholars of Tianjin [17JCJQJC45500]
- National Natural Science Foundation of China (NSFC) [21577073, 21876091]
- Natural Science Foundation of Tianjin [16JCZDJC33700]
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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 (R-2 > 0.975) and Langmuir models (R-2 > 0.979). Thermodynamic analysis revealed that the adsorption process was spontaneous (Delta G(0) < 0) and endothermic (Delta H-0 > 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. (C) 2019 Elsevier B.V. All rights reserved.
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