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New strategy to remove phosphate from low concentration solution by MOFs-modified resin: High affinity and thermal desorption.

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Title: New strategy to remove phosphate from low concentration solution by MOFs-modified resin: High affinity and thermal desorption.
Authors: Tang, Qiong1 (AUTHOR), Yin, Zhonglong1 (AUTHOR), Wang, Ruoding1 (AUTHOR), Zhu, Wei1 (AUTHOR), Zhang, Zepeng1 (AUTHOR), Wang, Yue1 (AUTHOR), Yang, Zhen1 (AUTHOR), Liu, Fuqiang2 (AUTHOR), Yang, Weiben1 (AUTHOR) yangwb007@njnu.edu.cn
Source: Chemical Engineering Journal. Jun2023, Vol. 465, pN.PAG-N.PAG. 1p.
Subjects: Phosphate removal (Water purification), Metal-organic frameworks, Thermal desorption, Calcium phosphate, Molecular dynamics, Phosphates, Adsorption capacity
Abstract: [Display omitted] • MIL-101(Fe) modified resin was constructed to remove low concentration phosphate. • Both high adsorption affinity toward phosphate and easy regeneration were achieved. • Electrostatic attraction and ligand exchange were the main adsorption mechanisms. Adsorption process was usually torn between higher affinity and easier regeneration. Herein, for removing phosphate from low concentration solution, a new strategy was developed to break this tradeoff by metal organic frameworks (MOFs) confined in resins. For comparison, a series of metal oxide modified resins were prepared as adsorbents together with MOFs modified resins (transformation from corresponding oxides). MIL-101(Fe) presents higher adsorption capacity (41.79 mg/g) than Oxide(Fe)@201(36.07 mg/g), as well as high anti-interference ability with removal efficiency of 99.8% (2 mg/L phosphate), even if the loading amounts of iron in Oxide(Fe)@201 is almost twice of that in MIL-101(Fe)@201. Instrumental analysis and molecular dynamics simulations show that the higher adsorption affinity is mainly due to direct interaction between Fe3+ and phosphate via the formation of Fe-O-P, leading to much lower adsorption binding energy (E ads) of phosphate on MIL-101(Fe)@201 (-42.48 kcal/mol) than Oxide(Fe)@201; In desorption process, the MOFs structure can be stably restored with push of organic salt and high temperature (60 °C) around neutral pH due to the reversible structural transformation of MOFs. Moreover, MIL-101(Fe)@201 can continuously purify wastewater containing low concentration phosphate in fixed bed system after multiple regeneration, the water treatment capacity remained above ∼3000 BV and the regenerants can be intermittently recycled with precipitation of calcium phosphate from the solutions. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:[Display omitted] • MIL-101(Fe) modified resin was constructed to remove low concentration phosphate. • Both high adsorption affinity toward phosphate and easy regeneration were achieved. • Electrostatic attraction and ligand exchange were the main adsorption mechanisms. Adsorption process was usually torn between higher affinity and easier regeneration. Herein, for removing phosphate from low concentration solution, a new strategy was developed to break this tradeoff by metal organic frameworks (MOFs) confined in resins. For comparison, a series of metal oxide modified resins were prepared as adsorbents together with MOFs modified resins (transformation from corresponding oxides). MIL-101(Fe) presents higher adsorption capacity (41.79 mg/g) than Oxide(Fe)@201(36.07 mg/g), as well as high anti-interference ability with removal efficiency of 99.8% (2 mg/L phosphate), even if the loading amounts of iron in Oxide(Fe)@201 is almost twice of that in MIL-101(Fe)@201. Instrumental analysis and molecular dynamics simulations show that the higher adsorption affinity is mainly due to direct interaction between Fe3+ and phosphate via the formation of Fe-O-P, leading to much lower adsorption binding energy (E ads) of phosphate on MIL-101(Fe)@201 (-42.48 kcal/mol) than Oxide(Fe)@201; In desorption process, the MOFs structure can be stably restored with push of organic salt and high temperature (60 °C) around neutral pH due to the reversible structural transformation of MOFs. Moreover, MIL-101(Fe)@201 can continuously purify wastewater containing low concentration phosphate in fixed bed system after multiple regeneration, the water treatment capacity remained above ∼3000 BV and the regenerants can be intermittently recycled with precipitation of calcium phosphate from the solutions. [ABSTRACT FROM AUTHOR]
ISSN:13858947
DOI:10.1016/j.cej.2023.142864