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Li Q, Yan W, Li M, Chen X, Wu T, He X, Yao Q, Yan Y, Li G. Contrasting effects of a traditional material of polyaluminum chloride and an emerging material of lanthanum carbonate capping on sediment internal phosphorus immobilization. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 917:170538. [PMID: 38296068 DOI: 10.1016/j.scitotenv.2024.170538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 01/15/2024] [Accepted: 01/26/2024] [Indexed: 02/06/2024]
Abstract
Polyaluminum chloride (PAC) is a traditional material used for immobilizing sediment internal phosphorus (P) in field-scale experiment. Lanthanum carbonate (LC) is an emerging material which have been used in immobilizing sediment internal P in laboratory. To promote LC in practice, the premise is that it does have advantages over traditional material when used. Herein, a 90-day incubation experiment was conducted comparing the effectiveness and mechanism of LC and PAC capping in controlling sediment internal P. The results of isotherm experiment and XPS analysis indicated that the adsorption mechanism of P onto LC and PAC involved ligand exchange and formation of inner-sphere La/Al-O-P complexes. The incubation experiment revealed that PAC capping was more effective in reducing pore water soluble reactive phosphorus (SRP), exhibiting a reduction of up to 81.32 % but showed a decrease trend. However, LC capping resulted in a reduction of pore water SRP up to 52.84 % and maintained stability. On average, LC and PAC capping reduced SRP flux by 0.27 and 0.32 μg·m-2d-1, respectively relative to the control sediment. Moreover, LC capping facilitated the formation of Fe(III)/Mn(IV) oxyhydroxides, leading to an increased P adsorption, whereas PAC capping facilitated the reduction of Fe(III)/Mn(IV) minerals with P release. Additionally, LC capping resulted in the reduction of a higher ratio of mobile P/TP to stable P forms than PAC capping, as compared to the control. In contrast to PAC capping which converted mobile P to stable NaOH-rP, LC capping transformed mobile P and NaOH-rP into more stable HCl-P and ResP. Both LC and PAC capping caused variations in sediment bacterial communities. Nevertheless, PAC capping heightened the risk of Co, Ni, Cu, and Pb releases in sediment compared to LC capping. In summary, this study suggested that LC capping surpassed PAC capping in immobilizing sediment internal P.
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Affiliation(s)
- Qi Li
- College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China; National Key Laboratory of Water Disaster Prevention, Hohai University, Nanjing 210098, China
| | - Wenming Yan
- College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China; National Key Laboratory of Water Disaster Prevention, Hohai University, Nanjing 210098, China.
| | - Minjuan Li
- National Key Laboratory of Water Disaster Prevention, Hohai University, Nanjing 210098, China
| | - Xiang Chen
- Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
| | - Tingfeng Wu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Xiangyu He
- College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
| | - Qi Yao
- College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
| | - Yulin Yan
- College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
| | - Gaoxiang Li
- College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
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Li Q, Liu L, Yan W, Chen X, Liu R, Zhao Z, Jiang F, Huang Y, Zhang S, Zou Y, Yang C. Influence on the release of arsenic and tungsten from sediment, and effect on other heavy metals and microorganisms by ceria nanoparticle capping. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 343:123161. [PMID: 38104760 DOI: 10.1016/j.envpol.2023.123161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Revised: 12/03/2023] [Accepted: 12/12/2023] [Indexed: 12/19/2023]
Abstract
In this study, ceria nanoparticle (CNP) was used as a capping agent to investigate the efficiency and mechanism of simultaneously controlling the release of sediment internal Arsenic (As) and tungsten (W). The results of incubation experiment demonstrated that CNP capping reduced soluble As and W by 81.80% and 97.97% in overlying water, respectively; soluble As and W by 65.64% and 60.13% in pore water, respectively; and labile As and W in sediment by 45.20% and 53.20%, respectively. The main mechanism of CNP controlling sediment internal As and W was through adsorption via ligand exchange and inner-sphere complexation, as determined through adsorption experiments, XPS and FIRT spectra analysis. Besides, CNP also acted as an oxidant, facilitating the oxidation of AsⅢ to AsV and thereby enhancing the adsorption of soluble As. Additionally, sediment As and W fractions experiments demonstrated that the immobilization of As and W with CNP treatment via transforming mobile to stable fractions was another mechanism inhibiting sediment As and W release. The obtained significant positive correlation between soluble As/W and Fe/Mn, labile As/W and Fe/Mn indicated that iron (Fe) and manganese (Mn) oxidation, influenced by CNP, serve as additional mechanisms. Moreover, Fe redox plays a crucial role in controlling internal As and W, while Mn redox plays a more significant role in controlling As compared to W. Meanwhile, CNP capping effectively prevented the release of As and W by reducing the activity of microorganisms that degrade Fe-bound As and W and reduced the release risk of V, Cr, Co, Ni, and Zn from sediments. Overall, this study proved that CNP was a suitable capping agent for simultaneously controlling the release of As and W from sediment.
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Affiliation(s)
- Qi Li
- College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China.
| | - Ling Liu
- College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China.
| | - Wenming Yan
- College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China; National Key Laboratory of Water Disaster Prevention, Hohai University, Nanjing, 210098, China
| | - Xiang Chen
- Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing, 210042, China
| | - Ruiyan Liu
- College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China
| | - Ziyi Zhao
- College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China
| | - Feng Jiang
- College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China
| | - Yanfen Huang
- College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China
| | - Shunting Zhang
- College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China
| | - Yiqian Zou
- College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China
| | - Chenjun Yang
- College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China
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