文献类型：期刊文献

英文题名：A Biosorption-Pyrolysis Process for Removal of Pb from Aqueous Solution and Subsequent Immobilization of Pb in the Char

作者：Wang, Yue[1];Lu, Jinhong[1];Feng, Dongqing[1];Guo, Sen[1];Li, Jianfa[1]

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

年份：2020

卷号：12

期号：9

外文期刊名：WATER

收录：SCI-EXPANDED(收录号：WOS:000580702200001)、、EI(收录号：20221211831346)、Scopus(收录号：2-s2.0-85103395857)、WOS

基金：This research was funded by the Natural Science Foundation of Zhejiang Province, China, grant number LY16B070003, and by the National Natural Science Foundation of China, grant number 41271475.

语种：英文

外文关键词：heavy metal; biosorption; biochar; immobilization; phosphoric acid

外文摘要：The application of biosorption in the removal of heavy metals from water faces a challenge of safe disposal of contaminated biomass. In this study, a potential solution for this problem was proposed by using a biosorption-pyrolysis process featured by pretreatment of biomass with phosphoric acid (PA). The PA pretreatment of biomass increased the removal efficiency of heavy metal Pb from water by sorption, and subsequent pyrolysis helped immobilize Pb in the residual char. The results indicate that most (>95%) of the Pb adsorbed by the PA-pretreated biomass was retained in the char, and that the lower pyrolysis temperature (350 degrees C) is more favorable for Pb immobilization. In this way, the bioavailable Pb in the char was hardly detected, while the Pb leachable in acidic solution decreased to <3% of total Pb in the char. However, higher pyrolysis temperature (450 degrees C) is unfavorable for Pb immobilization, as both the leachable and bioavailable Pb increased to >28%. The reason should be related to the formation of elemental Pb and unstable Pb compounds during pyrolysis at 450 degrees C, according to the X-ray diffraction study.