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...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-12-01
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| Series: | Ecotoxicology and Environmental Safety |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0147651321009921 |
| _version_ | 1818858644642463744 |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-19T08:59:34Z |
| format | Article |
| id | doaj.art-22479636498c441cbb06448351b47fa9 |
| institution | Directory Open Access Journal |
| issn | 0147-6513 |
| language | English |
| last_indexed | 2024-12-19T08:59:34Z |
| publishDate | 2021-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecotoxicology and Environmental Safety |
| spelling | doaj.art-22479636498c441cbb06448351b47fa92022-12-21T20:28:30ZengElsevierEcotoxicology and Environmental Safety0147-65132021-12-01227112880Combined effects of Penicillium oxalicum and tricalcium phosphate on lead immobilization: Performance, mechanisms and stabilitiesShaofen Hao0Jiang Tian1Xingwang Liu2Peiying Wang3Yun Liu4Songqiang Deng5Dayi Zhang6Department of Environmental Science and Engineering, College of Environment and Resources, Xiangtan University, Xiangtan 411105, ChinaDepartment of Environmental Science and Engineering, College of Environment and Resources, Xiangtan University, Xiangtan 411105, ChinaDepartment of Environmental Science and Engineering, College of Environment and Resources, Xiangtan University, Xiangtan 411105, China; Corresponding author.Department of Environmental Science and Engineering, College of Environment and Resources, Xiangtan University, Xiangtan 411105, ChinaDepartment of Environmental Science and Engineering, College of Environment and Resources, Xiangtan University, Xiangtan 411105, ChinaResearch Institute for Environmental Innovation (Tsinghua-Suzhou), Suzhou, ChinaSchool of Environment, Tsinghua University, Beijing, ChinaPhosphorus (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.http://www.sciencedirect.com/science/article/pii/S0147651321009921Penicillium oxalicumTricalcium phosphateLead immobilizationHydroxypyromorphite |
| spellingShingle | 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 Ecotoxicology and Environmental Safety Penicillium oxalicum Tricalcium phosphate Lead immobilization Hydroxypyromorphite |
| title | 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_short | 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 |
| topic | Penicillium oxalicum Tricalcium phosphate Lead immobilization Hydroxypyromorphite |
| url | http://www.sciencedirect.com/science/article/pii/S0147651321009921 |
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