Crystallinity and dissolution-recrystallization mechanism controlled As(V) retention by calcium phosphate
Retention of toxic metals/metalloids like arsenic via mineral-water interaction plays a crucial role in the environmental behavior of pollutants. However, the influence of mineral crystallinity on the retention of toxic elements, the evolution of liquid composition, and the interaction mechanism are...
| Main Authors: | , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2025
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| Online Access: | https://hdl.handle.net/10356/182596 |
| _version_ | 1826113357385564160 |
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| author | Yan, Yao Cao, Xun Li, Jun Zhang, Hanxiao Yang, Yongqiang Chen, Fanrong Zhu, Runliang Liu, Dong White, Tim Wu, Shijun |
| author2 | School of Materials Science and Engineering |
| author_facet | School of Materials Science and Engineering Yan, Yao Cao, Xun Li, Jun Zhang, Hanxiao Yang, Yongqiang Chen, Fanrong Zhu, Runliang Liu, Dong White, Tim Wu, Shijun |
| author_sort | Yan, Yao |
| collection | NTU |
| description | Retention of toxic metals/metalloids like arsenic via mineral-water interaction plays a crucial role in the environmental behavior of pollutants. However, the influence of mineral crystallinity on the retention of toxic elements, the evolution of liquid composition, and the interaction mechanism are poorly understood. This study investigated the interaction between As(V) and calcium phosphate (CaP) under oxic conditions with varying crystallinities, particularly amorphous CaP (ACP), across varying As(V) concentrations and pH conditions. Results revealed that the amorphous phase substantially influenced As(V) fate, with the As(V) retention potential of ACP and poorly crystalline hydroxylapatite (HAP) being 13.65 and 12.61 times higher than highly crystalline HAP, respectively. As(V) retention involves the dissolution of ACP and the recrystallization of As(V)-substituted HAP, correlated with three distinct ACP transformation stages during recrystallization. The lower pH (7.5) facilitated ACP dissolution, and the elevated Ca2+ concentration enhanced the volume of CaP recrystallization. Conversely, higher pH levels (8.0, 8.5, and 9.0) promoted a higher degree of recrystallization, evidenced by reduced residual Ca2+ levels after 48 hrs (post-crystallization stage). Meanwhile, As-bearing CaP forms with greater competition between PO43- and AsO43- at higher initial As(V) concentrations than lower ones. Additionally, lattice distortion, increases in species of surface bond groups, and reduced crystallinity were observed in the As(V)-bearing CaP product. Overall, this study underscores the pivotal role of ACP and its poorly crystalline counterparts in arsenic retention through the dissolution-recrystallization mechanism. |
| first_indexed | 2025-03-09T10:50:07Z |
| format | Journal Article |
| id | ntu-10356/182596 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-03-09T10:50:07Z |
| publishDate | 2025 |
| record_format | dspace |
| spelling | ntu-10356/1825962025-02-11T06:25:49Z Crystallinity and dissolution-recrystallization mechanism controlled As(V) retention by calcium phosphate Yan, Yao Cao, Xun Li, Jun Zhang, Hanxiao Yang, Yongqiang Chen, Fanrong Zhu, Runliang Liu, Dong White, Tim Wu, Shijun School of Materials Science and Engineering Engineering Hydroxylapatite Amorphous calcium phosphate Retention of toxic metals/metalloids like arsenic via mineral-water interaction plays a crucial role in the environmental behavior of pollutants. However, the influence of mineral crystallinity on the retention of toxic elements, the evolution of liquid composition, and the interaction mechanism are poorly understood. This study investigated the interaction between As(V) and calcium phosphate (CaP) under oxic conditions with varying crystallinities, particularly amorphous CaP (ACP), across varying As(V) concentrations and pH conditions. Results revealed that the amorphous phase substantially influenced As(V) fate, with the As(V) retention potential of ACP and poorly crystalline hydroxylapatite (HAP) being 13.65 and 12.61 times higher than highly crystalline HAP, respectively. As(V) retention involves the dissolution of ACP and the recrystallization of As(V)-substituted HAP, correlated with three distinct ACP transformation stages during recrystallization. The lower pH (7.5) facilitated ACP dissolution, and the elevated Ca2+ concentration enhanced the volume of CaP recrystallization. Conversely, higher pH levels (8.0, 8.5, and 9.0) promoted a higher degree of recrystallization, evidenced by reduced residual Ca2+ levels after 48 hrs (post-crystallization stage). Meanwhile, As-bearing CaP forms with greater competition between PO43- and AsO43- at higher initial As(V) concentrations than lower ones. Additionally, lattice distortion, increases in species of surface bond groups, and reduced crystallinity were observed in the As(V)-bearing CaP product. Overall, this study underscores the pivotal role of ACP and its poorly crystalline counterparts in arsenic retention through the dissolution-recrystallization mechanism. Nanyang Technological University We are grateful to acknowledge the funding support provided by the Guangdong Basic and Applied Basic Research Foundation (2024B1515040003), the Fundamental and Applied Fundamental Research Major Program of Guangdong Province, China (Grant No. 2019B030302013), the Science and Technology Planning Project of Guangdong Province, China (Grant No. 2023B1212060044, 2023B1212060048), the National Natural Science Foundation of China (Grant No. 41877135), the Market Readiness Assistance Grant of Singapore (Grant No. 04INS000458C150OOE01) and the Monetary Academic Resources for Research (Grant No. 001561–00001) awarded to Prof Tim White by Nanyang Technological University (NTU), Singapore. Yan Yao acknowledges financial support from the China Scholarship Council for her year-long study at NTU (CSC, 202104910449). 2025-02-11T06:25:49Z 2025-02-11T06:25:49Z 2025 Journal Article Yan, Y., Cao, X., Li, J., Zhang, H., Yang, Y., Chen, F., Zhu, R., Liu, D., White, T. & Wu, S. (2025). Crystallinity and dissolution-recrystallization mechanism controlled As(V) retention by calcium phosphate. Journal of Hazardous Materials, 481, 136517-. https://dx.doi.org/10.1016/j.jhazmat.2024.136517 0304-3894 https://hdl.handle.net/10356/182596 10.1016/j.jhazmat.2024.136517 39561542 2-s2.0-85209241069 481 136517 en 001561-00001 Journal of Hazardous Materials © 2024 Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies. |
| spellingShingle | Engineering Hydroxylapatite Amorphous calcium phosphate Yan, Yao Cao, Xun Li, Jun Zhang, Hanxiao Yang, Yongqiang Chen, Fanrong Zhu, Runliang Liu, Dong White, Tim Wu, Shijun Crystallinity and dissolution-recrystallization mechanism controlled As(V) retention by calcium phosphate |
| title | Crystallinity and dissolution-recrystallization mechanism controlled As(V) retention by calcium phosphate |
| title_full | Crystallinity and dissolution-recrystallization mechanism controlled As(V) retention by calcium phosphate |
| title_fullStr | Crystallinity and dissolution-recrystallization mechanism controlled As(V) retention by calcium phosphate |
| title_full_unstemmed | Crystallinity and dissolution-recrystallization mechanism controlled As(V) retention by calcium phosphate |
| title_short | Crystallinity and dissolution-recrystallization mechanism controlled As(V) retention by calcium phosphate |
| title_sort | crystallinity and dissolution recrystallization mechanism controlled as v retention by calcium phosphate |
| topic | Engineering Hydroxylapatite Amorphous calcium phosphate |
| url | https://hdl.handle.net/10356/182596 |
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