Chinese Journal of Applied Chemistry ›› 2017, Vol. 34 ›› Issue (2): 211-219.DOI: 10.11944/j.issn.1000-0518.2017.02.160176

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Phosphate Removal by Using Shield Residues/Carbon Composite Ceramsite

XIE Fezhiab*(),LI Haibinac,LI Guolianbd,CHEN Jianliac,YANG Wenac,WANG Xuechunac,HU Tingtingac,SHENG Dandanac,XIE Zhiyongac   

  1. aSchool of Materials and Chemical Engineering,Anhui Jianzhu University,Hefei 230601,China
    bAnhui Key Laboratory of Water Pollution Control and Wastewater Resource,Anhui Jianzhu University,Hefei 230601,China
    cAnhui Key Laboratory of Advanced Building Materials,Anhui Jianzhu University,Hefei 230601,China
    dSchool of Environment and Energy Engineering,Anhui Jianzhu University,Hefei 230601,China
  • Received:2016-04-26 Accepted:2016-07-08 Published:2017-01-18 Online:2017-01-18
  • Contact: XIE Fezhi
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21107001), the Natural Science Foundation of Anhui Province, China(No.1608085MB43), the Natural Science Foundation of Education Department of Anhui Province(No.KJ2016A154), the Outstanding Youth Elite Support Program in Universities of Anhui Province(No.2014-5)

Abstract:

Composite ceramsite was prepared by sintering solid waste residue of shield residues, powdered rice straw and magnesium oxide. The effects of pH, sorption time and temperature were investigated. The results show that the optimal sintering temperature of the composite ceramsite is 700 ℃ with the mass ratio of shield residue to powdered rice straw and to magnesium oxide as 7:2:1. The optimum adsorption pH is 6.3, and phosphate can reach adsorption equilibrium within 12 hours. The Lagergren pseudo second order kinetics and the Temkin isotherm model fit the experimental data well. The adsorption capacity increases with increasing the sorption temperature, and the maximum adsorption of ceramsite is 12.76 mg/g at 40 ℃. The adsorption is confirmed as a nonspontaneous endothermic process according to the results of ΔH=5.64 kJ/mol>0, ΔS=8.00 J/(K·mol)>0, ΔG=3.16 kJ/mol>0. Meanwhile, the adsorbed phosphate on ceramsite can be recovered by using 2.0 mol/L NaOH.

Key words: shield residue, carbon, ceramsite, phosphate, adsorption