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Ma X, Li Q, Li R, Zhang W, Sun X, Li J, Shen J, Han W. Removal performance and mechanisms of Pb(II) and Sb(V) from water by iron-doped phosphogypsum: single and coexisting systems. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:87413-87425. [PMID: 35804235 DOI: 10.1007/s11356-022-21862-y] [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: 03/22/2022] [Accepted: 07/01/2022] [Indexed: 06/15/2023]
Abstract
The serious environmental risks caused by Pb(II) and Sb(V) co-contamination increase the need for their efficient and simultaneous removal. In this study, the remediation feasibility by Fe-doped phosphogypsum (FPG) was elucidated for single systems with Pb or Sb pollutant and coexisting systems with both from water. As for single systems, Fe doping effectively enhanced the Pb(II) removal performance by phosphogypsum (PG) at low Pb(II) concentrations of below 100 mg/L via the combination of precipitation and complexation. The optimal removal rate of Sb(V) by FPG increased by 2.08-3.31 times as compared to that of by PG (10-120 mg/L), mainly due to the strong affinity of iron hydroxyl (≡Fe-O-H) towards Sb(V). Compared with the single systems, the coexistence greatly enhanced the Pb(II) and Sb(V) removal performance by FPG, and the interaction behavior between Pb(II) and Sb(V) on the FPG was concentration dependent. Briefly, the sorption of FPG controlled the elimination of low coexisting concentrations of Pb(II) and Sb(V), whereas the co-precipitation process between Pb(II) and Sb(V) predominated with high ions concentration. The significant synergistic effects were found during the removal of Pb(II) and Sb(V) on FPG in the coexisting system, which mainly attributed to precipitation, bridging complexation and electrostatic attraction. Considering the advantages such as facile preparation, low cost and high removal capacity, FPG is a promising material to uptake Pb(II) and/or Sb(V) from contaminated water.
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Affiliation(s)
- Xinyue Ma
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, Jiangsu, China
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Qiao Li
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, Jiangsu, China
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Rui Li
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, Jiangsu, China
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Wei Zhang
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, Jiangsu, China
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Xiuyun Sun
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, Jiangsu, China.
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
| | - Jiansheng Li
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, Jiangsu, China
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Jinyou Shen
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, Jiangsu, China
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Weiqing Han
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, Jiangsu, China
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
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Ziegenheim S, Sztegura A, Szabados M, Kónya Z, Kukovecz Á, Pálinkó I, Sipos P. EDTA analogues – unconventional inhibitors of gypsum precipitation. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Fan P, Zhang M, Zhao M, Peng J, Gao K, Huang J, Yi W, Zhu C. The Influences of Soluble Phosphorus on Hydration Process and Mechanical Properties of Hemihydrate Gypsum under Deep Retarding Condition. MATERIALS 2022; 15:ma15072680. [PMID: 35408012 PMCID: PMC9000870 DOI: 10.3390/ma15072680] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Revised: 03/26/2022] [Accepted: 03/30/2022] [Indexed: 02/06/2023]
Abstract
Phospho-gypsum is an industrial solid waste discharged from the phosphate production process. The waste includes complex impurities such as phosphoric acid and its salts, fluoride, and organics. Usually, retarders are mixed in gypsum-based building materials to extend setting time. Although the effects of the impurities on hydration properties and the mechanical strength of calcined gypsum have been analyzed, the impact and mechanism of soluble phosphorus on the phospho-gypsum under retardation is yet to be defined. In this study, we employed thermogravimetry (TG), X-ray diffraction (XRD) and scanning electron microscopy (SEM) to evaluate the hydration kinetics, phase transformation, structure, and morphology of the calcined gypsum. The data showed that the retarder or soluble phosphorus prolonged the setting time. A single retarder considerably shortened the initial setting time from 95 min to 60 min, even at the lowest dosage of 0.1 wt.% soluble phosphorus. In addition, drying flexural and compressive strengths were markedly decreased. On the other hand, the induction period was advanced with extension of acceleration and deceleration stage. SEM results indicated that the crystal morphology of the gypsum changed from a long to short column or block. An EDS analysis showed that phosphates were concentrated on the surface of gypsum crystals.
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Affiliation(s)
- Puyue Fan
- College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China; (P.F.); (M.Z.); (K.G.); (J.H.); (W.Y.)
| | - Mingtao Zhang
- College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China; (P.F.); (M.Z.); (K.G.); (J.H.); (W.Y.)
| | - Min Zhao
- School of Civil and Architectural Engineering, Yangtze Normal University, Chongqing 408100, China
- Correspondence: (M.Z.); (J.P.)
| | - Jiahui Peng
- College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China; (P.F.); (M.Z.); (K.G.); (J.H.); (W.Y.)
- Correspondence: (M.Z.); (J.P.)
| | - Kai Gao
- College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China; (P.F.); (M.Z.); (K.G.); (J.H.); (W.Y.)
| | - Jing Huang
- College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China; (P.F.); (M.Z.); (K.G.); (J.H.); (W.Y.)
| | - Wei Yi
- College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China; (P.F.); (M.Z.); (K.G.); (J.H.); (W.Y.)
| | - Cong Zhu
- College of Civil Engineering, Chongqing University of Arts and Sciences, Chongqing 402160, China;
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