Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 559, Issue -, Pages 121-129Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2016.03.151
Keywords
Phosphate; adsorption; layered double hydroxides; biochar; Mg/Al ratio
Categories
Funding
- USDA-NRCS National Conservation Innovation Grant (NRCS), United States [69-3A75-10-156]
- Chinese Universities Scientific Fund [2014YB064]
- Northwest A&F University Ph.D. Staff Scientific Fund, China [2013BSJJ120]
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Mg/Al ratio plays a significant role for anion adsorption by Mg/Al-layered double hydroxides (Mg/Al-LDHs) modified biochar. In this study, Mg/Al-LDHs biochar with different Mg/Al ratios (2, 3, 4) were prepared by co-precipitation for phosphate removal from aqueous solution. Factors on phosphate adsorption including Mg/Al ratio, pH, and the presence of other inorganic anions were investigated through batch experiments. Increasing Mg/Al ratio in the Mg/Al-LDHs biochar composites generally enhanced phosphate adsorption with Langmuir adsorption maximum calculated at 81.83 mg phosphorous (P) per gram of 4:1 Mg/Al-LDHs biochar at pH 3.0. The adsorption process was best described by the pseudo-second-order kinetic model. Solution pH had greater effects on the phosphate adsorption by Mg/Al LDHs biochar composites with lower Mg/Al ratios. The presence of other inorganic anions decreased the phosphate adsorption efficiency in the order of F- > SO42- > NO2- > Cl-. Phosphate adsorption mechanism involves ion exchange, electrostatic attraction and surface inner-sphere complex formation. Overall, Mg/Al-LDHs biochar composites offer a potential alternative of carbon-based adsorbent for phosphate removal from aqueous solution. (C) 2016 Elsevier B.V. All rights reserved.
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