Journal
CHEMOSPHERE
Volume 195, Issue -, Pages 666-672Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.12.101
Keywords
Phosphorus; HydroxyLapatite; Calcium hydroxide; Ca-BC; Adsorption
Categories
Funding
- National Nature Science Foundations of China [51508116, 4137264, 21407155]
- Nature Science Foundations of Guangdong Province [2016A030310265]
- Science and Technology Research Programs of Guangzhou City [201607010311]
- High level university construction project (Regional water environment safety and water ecological protection)
- Project of Guangdong Provincial Key Laboratory of radioactive contamination control and resources [2012A061400023]
- Hongkong Scholarship [XJ2016037]
- Guangzhou University's training program for young top-notch personnels [BJ201706]
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Discharging phosphorus (P)-contaminated water directly into the aquatic environment leads to resource loss and eutrophication. Thus, removing P from waste streams is imperative. In this study, calcium decorated biochar (Ca-BC) in different mass ratios of Ca to BC was designed to effectively adsorb P from solution. Ca-BC was characterized through X-ray diffraction (XRD) analysis, followed by isotherm and kinetic adsorption experiments. The decorated Ca on the BC surface was found to have preferred P adsorption ability. A design of calcium hydroxide (Ca(OH)(2)) to flour in a mass ratio of 2:1 was found to have a maximum adsorption capacity of 314.22 mg g(-1) for P. The Langmuir and pseudo-second-order models fit the sorption process adequately. XRD analysis indicated that the preferable adsorption ability to P was due to the reaction of Ca(OH)(2) and PO34-, forming the hydroxylapatite (Ca-5(PO4)(3)(OH)) crystal. The P in solution was transformed to the crystal. Thus, Ca-BC is an environmental friendly and low-cost sorbent for P removal. (C) 2017 Elsevier Ltd. All rights reserved.
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