文献类型：期刊文献

英文题名：Stabilization of Pb(II) accumulated in biomass through phosphate-pretreated pyrolysis at low temperatures

作者：Li, Saijun[1];Zhang, Tao[1];Li, Jianfa[1];Shi, Lingna[1];Zhu, Xiaoxiao[1];Lu, Jinhong[1];Li, Yimin[1]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China

年份：2017

卷号：324

起止页码：464

外文期刊名：JOURNAL OF HAZARDOUS MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000390182600039)、、EI(收录号：20165003119657)、Scopus(收录号：2-s2.0-85002626285)、WOS

基金：This work was supported by grants from the National Natural Science Foundation of China (41271475) and from the Natural Science Foundation of Zhejiang Province, China (LY16B070003).

语种：英文

外文关键词：Heavy metal; Immobilization; Pyrolysis; Biomass; Biosorption

外文摘要：The remediation of heavy metal-contaminated soil and water using plant biomass is considered to be a green technological approach, although the harmless disposal of biomass accumulated with heavy metals remains a challenge. A potential solution to this problem explored in this work involves combining phosphate pretreatment with pyrolysis. Pb(II) was accumulated in celery biomass with superior sorption capacity and also in ordinary wood biomass through biosorption. The Pb(II)-impregnated biomass was then pretreated with phosphoric acid or calcium dihydrogen phosphate (CaP) and pyrolyzed at 350 or 450 degrees C. Pb(II) from biomass was in turn almost totally retained in chars, and the percentage of DTPA-extractable. Pb(II) was reduced to less than 5% of total Pb(II) in chars through CaP pretreatment Pb(II) stabilization was further confirmed through a sequential extraction test, which showed that more than 95% of Pb(II) was converted into stable species composed mainly of lead phosphates according to X-ray diffraction (XRD) and scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDX) analyses. Overall, phosphate-pretreated pyrolysis can stabilize both Pb(II) and degradable biomass, so as to control efficiently the hazards of heavy metal-contaminated biomass. (C) 2016 Elsevier B.V. All rights reserved.