Mineralization of lead by Phanerochaete chrysosporium microcapsules loaded with hydroxyapatite.
Mineralization of lead by Phanerochaete chrysosporium microcapsules loaded with hydroxyapatite.
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DOI：
10.1016/j.jhazmat.2021.126902
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发表时间：
2021-08
影响因子：
13.6
通讯作者：
Ni He;L. Hu;Zhiguo He;Mengke Li;Yongji Huang
中科院分区：
文献类型：
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作者：
Ni He;L. Hu;Zhiguo He;Mengke Li;Yongji Huang
本研究成功地制备了黄孢原毛平革菌(P.chrysosporium，PC)与羟基磷灰石(HAP)组装的微胶囊，并将其用于水溶液中铅(II)的固定化。考察了pH、温度、微胶囊投加量、HAP投加量、铅(II)初始浓度等条件对铅(II)去除的影响。在初始浓度为100m g时，对L−1的去除效果依次为HAP+PC>HAP>PC>CK(对照)，分别为87.7%、82.82%、63.67%和2.06%。在HAP+PC处理下，黄孢原毛霉分泌丰富的甲酸、草酸、柠檬酸等有机酸，当HAP的投加量从L−1的5 g增加到L−1的15 g时，甲酸的产量从L−1的32.37 g显著增加到L−1的66.02 g。表征结果表明，不溶的磷灰石由于分泌出有机酸，可以转化为可溶的磷酸盐，然后与铅(II)反应生成焦晶石[Pb10(PO4)6Cl2]和氢氧化铅[Pb10(PO4)6(OH)2]。总体结果清楚地表明，结合P。含HAP的黄孢子菌是一种很有前途的铅固定化技术。
In this study, microcapsules assembled withPhanerochaetechrysosporium (P. chrysosporium, PC) and hydroxyapatite (HAP) were successfully prepared and applied for Pb(II) immobilization in aqueous solution. The effect of different conditions on Pb(II) removal was investigated, such as pH, temperature, dosages of microcapsules and HAP, and initial concentrations of Pb(II). The removal efficiency of Pb(II) was in order of HAP+PC > HAP > PC > CK (control check) at the Pb(II) initial concentration of 100 mg L−1, which were 87.7%, 82.82%, 63.67% and 2.06%, respectively. Under HAP+PC treatment,P. chrysosporiumsecreted plentiful organic acids like formic, oxalic and citric acids, when the addition dose of HAP increased from 5 g L−1to 15 g L−1, the production of formic acid increased remarkably from 32.37 g L−1to 66.02 g L−1. After reaction,P. chrysosporiumkept a good biological activity evidenced by the live/dead stain test. The characterization results indicated that the insoluble apatite could transform to soluble phosphate due to the secreted organic acids, then reacted with Pb(II) to form pyromorphite [Pb10(PO4)6Cl2] and lead phosphate hydroxide [Pb10(PO4)6(OH)2]. The overall results clearly demonstrated that combiningP. chrysosporiumwith HAP could be used as a promising technology to accelerate lead immobilization.