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Adsorption of phosphate on copper mine tailing samples

Kong Lixi1,Xue Feng1,Chen Lili2,Sun Qingye3,Yang Linzhang1.(1.Institute of Soil Science,CAS,Nanjing Jiangsu 210008;2.Environmental Protection Agency of Wuzhong District,Suzhou Jiangsu 215128;3.School of Life Sciences,Anhui University,Hefei Anhui 230039)  
A sample of the clean and sieved(200 mesh)copper mine tailings was characterized by XRD;its major constituents were:Fe2O3(31.0%),SO3(27.4%),CaO(17.7%),SiO2(16.9%),Al2O3(4.20%).The sample was thermally activated to produce a more effective adsorbent for removing phosphate from solutions in the lab.The best adsorbent was produced by heating at 500 ℃ for 2 h.The adsorption isotherm data were well represented by both the Langmuir and the Freundlich isotherm models.Given the maximum adsorption capacity of 4.56 mg/g,as predicted by the Langmuir model,it may be attractive to process some waste copper mine tailings by thermal activation for removing phosphate from wastewaters.
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