Nitrogen-Doped Calcite Derived from Ca-MOFs as an Efficient Adsorbent for Sr(II) Removal from Water: The Role of Nitrogen and Calcium

Xinran Xie, Guoce Yu (), Jiangbo Huo (), Xinbo Zhang and Qing Du
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Xinran Xie: Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, China
Guoce Yu: Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, China
Jiangbo Huo: Joint Research Centre for Protective Infrastructure Technology and Environmental Green Bioprocess, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China
Xinbo Zhang: Joint Research Centre for Protective Infrastructure Technology and Environmental Green Bioprocess, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China
Qing Du: Joint Research Centre for Protective Infrastructure Technology and Environmental Green Bioprocess, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China

Clean Technol., 2024, vol. 7, issue 1, 1-18

Abstract: Strontium ( 90 Sr) is a typical radionuclide, which can act as a contaminant and poses a big problem for the eco-environment if left untreated. In this study, an original nitrogen-doped calcite (N-CaCO 3 ) was synthesized using a solvothermal and calcination method and used to remove Sr(II) from simulated water. XRD, SEM, and XPS analyses proved that N was successfully doped into CaCO 3 , resulting in porous CaCO 3 with a regular morphology. The specific surface area of N-CaCO 3 (136.53 m 2 /g) can reach 2.19-fold greater than that of CaCO 3 . The results based on the batch adsorption data indicated that the pseudo-second-order kinetic model (R 2 = 0.9964) and the ion exchange model (R 2 = 0.9859) fitted the adsorption data well. The as-synthesized N-CaCO 3 exhibited better adsorption performance in regard to low concentrations of Sr(II) (below 64.5 mg/L) compared with commercial CaCO 3 . The structural analysis suggested that Ca and N played pivotal roles in the adsorption process and that the adsorption mechanism was dominated by ion exchange and surface complexation. This study successfully fabricated a nitrogen-doped calcite for Sr(II) cleanup, presenting an efficient strategy to modulate the microstructure of CaCO 3 , or other materials, to enhance its adsorption performance.

Keywords: nitrogen calcite; Sr(II); Ca-MOFs; adsorption; radioactive wastewater (search for similar items in EconPapers)
JEL-codes: Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2024
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