Immobilization of Pb and Cd in contaminated soil using nano-crystallite hydroxyapatite
The efficiency and mechanism of nano-hydroxyapatite (nHA) in immobilizing Pb and Cd in contaminated soil were assessed in this work.The X-ray diffraction analysis indicated that the key mechanisms for Pb/Cd immobilization in the soil involve both surface complexation on the surface of nHA and dissolution of the nHA amendments and precipitation of Pb/Cd-containing phosphates.We tested the effects of different nHA dose (the molar ratio of P/(Pb+Cd)) on the water extraction of heavy metals,and phytoavailability of soil metals.The nHA application could significantly reduce water soluble Pb with 72% and Cd with 90%,bioaccessible Pb with a reduction of 12.5-27.5% and Cd with a reduction of 17.66-34.64%,respectively.The nHA reduced phytoavailability of Pb and Cd with 65.3% and 64.6% in contaminated soil,respectively.In addition,the treatment efficiency increased along with the nHA dose (based on the molar ratio of P/(Pb+Cd)) increased,and most effective ratio was molar ratio of P/(Pb+Cd) at 5∶1.The results in this study showed that nHA can immobililize Pb and Cd in contaminated soil effectively.
Nano-hydroxyapatite Lead Cadmium Immobilization Bioaccessibility Phytoavailability
Mao He Hui Shi Xinyue Zhao Ya Yu Bo Qu
The school of Environmental and Municipal Engineering, Xi an University of Architecture and Technol School of Resource and Enviromental Engineering, Mianyang Normal University, Mojiatown, Mianyang 621
国际会议
2013 International Symposium on Environmental Science and Technology(2013环境科学与技术国际会议)
大连
英文
533-539
2013-06-04（万方平台首次上网日期，不代表论文的发表时间）