Journal of South China University of Technology(Natural Science Edition) ›› 2019, Vol. 47 ›› Issue (5): 63-72.doi: 10.12141/j.issn.1000-565X.180558

• Materials Science & Technology • Previous Articles     Next Articles

Modification of Ceramsite by FeCl3 and the Corresponding Enhancement of Heavy Metals Adsorption
 

 YANG Yongmin1， 2 QIAO Ruilong1 XIE Xiaogeng1 ZHANG Tongsheng1， 3 LIU Xiaofei4    

  1.   1． School of Materials Science and Engineering，South China University of Technology，Guangzhou 510640，Guangdong， China; 2． College of Urban and Rural Construction，Zhongkai University of Agriculture and Engineering，Guangzhou 510225， Guangdong，China; 3． Guangdong Research Center of Low Carbon Construction Materials Technology，Guangzhou 510640， Guangdong，China; 4． Guangdong Hugro Material Technology Co． ，Ltd． ，Guangzhou 510640，Guangdong，China
  • Received:2018-11-09 Revised:2018-12-18 Online:2019-05-25 Published:2019-04-01
  • Contact: 张同生( 1983-) ，博士，副研究员，主要从事新型建筑材料及环境影响研究． E-mail:mstszhang@scut.edu.cn
  • About author:杨永民( 1981-) ，男，博士，主要从事新型建筑材料、材料修复水环境及水生态等的研究
  • Supported by:
     Supported by the Science and Technology Planning Project of Guangdong Province( 2016A020221009) 

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Abstract:  In order to improve the adsorption capacity and stability of ceramsite in wastewater with high heavy-metal concentration，porous ceramsite was modified via a pretreatment in FeCl3 solution and a calcination process． Then，the surface morphology of the ceramsite and the removal rates of heavy metals affected by the number of immersion-drying cycles，FeCl3 solution concentration and calcination temperature were investigated． The maximum adsorption capacity was achieved when the ceramsite was immersed in 1. 5 mol/L FeCl3 solution for 3 immersion-drying cycles and then calcined at 650 ℃． In a high heavy-metal concentration environment，the adsorption amount of Cu2 + increases from 0. 188 to 0. 897 mg/g，and the leaching rate of Cu2 + decreases from 3. 52% to 0. 96%． Moreover，the removal rates of Pb2 + ，Cu2 + and Cd2 + by the modified ceramsite respectively achieve 15. 0%， 22. 4% and 50. 1%，which are 7. 7，8. 9 and 9. 7 times that by the original ceramsite，respectively． 

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