A novel biochar composite was fabricated via the pyrolysis of distillers grains treated phosphogypsum for phosphate removal from water. Batch adsorption experiments were performed on the adsorption characteristics of phosphate. Effects of pyrolysis temperature, solution pH, the dosage of adsorbent, ambient temperature on phosphate adsorption were also investigated. The results demonstrated that the optimum initial solution pH for phosphate adsorption was 6.0, and high pyrolysis temperature was favorable for phosphate adsorption. The optimal dosage of biochar was 1.25 g L-1. A pseudo-secondorder kinetic model can well explain the adsorption kinetics, indicative of the energetically heterogeneous solid surface of the composite. The maximum phosphate adsorption capacity of the phosphogypsum modified biochar obtained from Langmuir isotherm reached 102.4 mg g(-1) which was almost five times that of distillers grains biochar alone (21.5 mg g(-1)). The mechanism is mainly attributed to electrostatic adsorption, surface precipitation and ligand exchange. The ideal adsorption performance indicated that biochar supported phosphogypsum can be used as high-quality adsorbent for phosphate removal in wastewater treatment. (C) 2019 Elsevier Ltd. All rights reserved. Publication name | CHEMOSPHERE Volume: 238 Article Number: UNSP 124684 DOI: 10.1016/j.chemosphere.2019.124684 Published: JAN 2020 | Author(s) | Wang, Bing; Lian, Guoqi; Lee, Xinqing; Gao, Bin; Li, Ling; Liu, Taoze; Zhang, Xueyang; Zheng, Yulin | Corresponding author(s) | WANG Bing wangbing@vip.gyig.ac.cn Guizhou Univ, Coll Resource & Environm Engn, Guiyang 550025, Guizhou, Peoples R China. Minist Nat Resources, Key Lab Karst Environm & Geohazard, Guiyang 550025, Guizhou, Peoples R China Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Guizhou, Peoples R China | View here for the details
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