Combined effects of Penicillium oxalicum and tricalcium phosphate on lead immobilization: Performance, mechanisms and stabilities

Phosphorus (P) containing minerals are identified as effective Pb stabilizers in soil, while their low solubility limit the Pb immobilization efficiency. In this work, the combination of phosphate solubilizing fungi (PSF) Penicillium oxalicum and tricalcium phosphate (TCP) was constructed and applie...

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Autores principales:	Shaofen Hao, Jiang Tian, Xingwang Liu, Peiying Wang, Yun Liu, Songqiang Deng, Dayi Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Penicillium oxalicum Tricalcium phosphate Lead immobilization Hydroxypyromorphite Environmental pollution TD172-193.5 Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/22479636498c441cbb06448351b47fa9
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spelling	oai:doaj.org-article:22479636498c441cbb06448351b47fa92021-11-06T04:14:26ZCombined effects of Penicillium oxalicum and tricalcium phosphate on lead immobilization: Performance, mechanisms and stabilities0147-651310.1016/j.ecoenv.2021.112880https://doaj.org/article/22479636498c441cbb06448351b47fa92021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0147651321009921https://doaj.org/toc/0147-6513Phosphorus (P) containing minerals are identified as effective Pb stabilizers in soil, while their low solubility limit the Pb immobilization efficiency. In this work, the combination of phosphate solubilizing fungi (PSF) Penicillium oxalicum and tricalcium phosphate (TCP) was constructed and applied to improve Pb immobilization stabilities in medium and soils. P. oxalicum+ TCP could significantly improve Pb2+ removal to above 99% under different TCP/Pb2+ and pH values. TCP and P. oxalicum could remarkably immobilize Pb by ion exchange, and PbC2O4 precipitation or surface adsorption, respectively. While the enhanced Pb immobilization in P. oxalicum+ TCP was explained by stronger Pb2+ interaction with tryptophan protein-like substances in extracellular polymeric substance, and the formation of the most stable Pb-phosphate compound hydroxypyromorphite (Pb5(PO4)3OH). Toxicity characteristic leaching procedure test showed that only 0.91% of Pb2+ was leachable in P. oxalicum+ TCP treatment, significantly lower than that in P. oxalicum (2.90%) and TCP (7.52%) treatments. In addition, the lowest soil exchangeable Pb fraction (37.1%) and the highest available soil P (88.0 mg/kg) were both found in P. oxalicum+ TCP treatment. By synergistically forming stable Pb-containing products, thus the combination of PSF and P minerals could significantly improve Pb2+ immobilization and stability in soils.Shaofen HaoJiang TianXingwang LiuPeiying WangYun LiuSongqiang DengDayi ZhangElsevierarticlePenicillium oxalicumTricalcium phosphateLead immobilizationHydroxypyromorphiteEnvironmental pollutionTD172-193.5Environmental sciencesGE1-350ENEcotoxicology and Environmental Safety, Vol 227, Iss , Pp 112880- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Penicillium oxalicum Tricalcium phosphate Lead immobilization Hydroxypyromorphite Environmental pollution TD172-193.5 Environmental sciences GE1-350
spellingShingle	Penicillium oxalicum Tricalcium phosphate Lead immobilization Hydroxypyromorphite Environmental pollution TD172-193.5 Environmental sciences GE1-350 Shaofen Hao Jiang Tian Xingwang Liu Peiying Wang Yun Liu Songqiang Deng Dayi Zhang Combined effects of Penicillium oxalicum and tricalcium phosphate on lead immobilization: Performance, mechanisms and stabilities
description	Phosphorus (P) containing minerals are identified as effective Pb stabilizers in soil, while their low solubility limit the Pb immobilization efficiency. In this work, the combination of phosphate solubilizing fungi (PSF) Penicillium oxalicum and tricalcium phosphate (TCP) was constructed and applied to improve Pb immobilization stabilities in medium and soils. P. oxalicum+ TCP could significantly improve Pb2+ removal to above 99% under different TCP/Pb2+ and pH values. TCP and P. oxalicum could remarkably immobilize Pb by ion exchange, and PbC2O4 precipitation or surface adsorption, respectively. While the enhanced Pb immobilization in P. oxalicum+ TCP was explained by stronger Pb2+ interaction with tryptophan protein-like substances in extracellular polymeric substance, and the formation of the most stable Pb-phosphate compound hydroxypyromorphite (Pb5(PO4)3OH). Toxicity characteristic leaching procedure test showed that only 0.91% of Pb2+ was leachable in P. oxalicum+ TCP treatment, significantly lower than that in P. oxalicum (2.90%) and TCP (7.52%) treatments. In addition, the lowest soil exchangeable Pb fraction (37.1%) and the highest available soil P (88.0 mg/kg) were both found in P. oxalicum+ TCP treatment. By synergistically forming stable Pb-containing products, thus the combination of PSF and P minerals could significantly improve Pb2+ immobilization and stability in soils.
format	article
author	Shaofen Hao Jiang Tian Xingwang Liu Peiying Wang Yun Liu Songqiang Deng Dayi Zhang
author_facet	Shaofen Hao Jiang Tian Xingwang Liu Peiying Wang Yun Liu Songqiang Deng Dayi Zhang
author_sort	Shaofen Hao
title	Combined effects of Penicillium oxalicum and tricalcium phosphate on lead immobilization: Performance, mechanisms and stabilities
title_short	Combined effects of Penicillium oxalicum and tricalcium phosphate on lead immobilization: Performance, mechanisms and stabilities
title_full	Combined effects of Penicillium oxalicum and tricalcium phosphate on lead immobilization: Performance, mechanisms and stabilities
title_fullStr	Combined effects of Penicillium oxalicum and tricalcium phosphate on lead immobilization: Performance, mechanisms and stabilities
title_full_unstemmed	Combined effects of Penicillium oxalicum and tricalcium phosphate on lead immobilization: Performance, mechanisms and stabilities
title_sort	combined effects of penicillium oxalicum and tricalcium phosphate on lead immobilization: performance, mechanisms and stabilities
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/22479636498c441cbb06448351b47fa9
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_version_	1718443904334823424

Combined effects of Penicillium oxalicum and tricalcium phosphate on lead immobilization: Performance, mechanisms and stabilities

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