Preparation and application of nano dendritic polyurethane for high-efficiency boron adsorption

doi:10.1016/j.cjche.2025.01.002

Chinese Journal of Chemical Engineering ›› 2025, Vol. 82 ›› Issue (6): 209-221.DOI: 10.1016/j.cjche.2025.01.002

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Preparation and application of nano dendritic polyurethane for high-efficiency boron adsorption

Pengyu Sun¹, Feiyu Gao¹, Wei Shi¹, Hengyuan Zhang¹, Shiao Du¹, Wei Chen^1,2,3, Meng Li⁴

1. School of Chemistry and Chemical Engineering, Qinghai Normal University, Xining 810016, China;
2. Academy of Plateau Science and Sustainability, People's Government of Qinghai Province & Beijing Normal University, Xining 810016, China;
3. Qinghai Provincial Key Laboratory of Advanced Technology and Application of Environment Functional Materials, Xining 810008, China;
4. Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices, School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China

Received:2024-10-30 Revised:2025-01-22 Accepted:2025-01-24 Online:2025-02-26 Published:2025-08-19
Contact: Wei Chen,E-mail:2016127@qhnu.edu.cn;Meng Li,E-mail:limeng@xatu.edu.cn
Supported by:
This work was financially supported by Applied Basic Research Project of Qinghai province (2023-ZJ-774).

Preparation and application of nano dendritic polyurethane for high-efficiency boron adsorption

Pengyu Sun¹, Feiyu Gao¹, Wei Shi¹, Hengyuan Zhang¹, Shiao Du¹, Wei Chen^1,2,3, Meng Li⁴

1. School of Chemistry and Chemical Engineering, Qinghai Normal University, Xining 810016, China;
2. Academy of Plateau Science and Sustainability, People's Government of Qinghai Province & Beijing Normal University, Xining 810016, China;
3. Qinghai Provincial Key Laboratory of Advanced Technology and Application of Environment Functional Materials, Xining 810008, China;
4. Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices, School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China

通讯作者: Wei Chen,E-mail:2016127@qhnu.edu.cn;Meng Li,E-mail:limeng@xatu.edu.cn
基金资助:
This work was financially supported by Applied Basic Research Project of Qinghai province (2023-ZJ-774).

Abstract

Abstract: Boron adsorbents with high adsorption capacities have long been a focus of research for a long time. This study used small molecular polyols with different hydroxyl groups as functional monomers and as end-capping agents, functional dendritic polyurethanes with nano structure were successfully prepared by one-pot method. The single molecule size and surface morphology were characterized by dynamic light scattering, transmission electron microscopy and scanning electron microscopy, and the molecular size in the dry state was 11 to 18 nm. The prepared materials were used as the boron adsorbents, and the effects of pH, time, boron solution concentration and temperature on the adsorption were studied. The results showed that the capacity of adsorbed boron could reach 110-130 mg·g^-1. Adsorption was a homogeneous monolayer adsorption controlled by chemisorption, and adsorption thermodynamics showed that was a spontaneous endothermic process. Adsorption behavior was best described by the pseudo-second-order kinetic model and the Langmuir isotherm. This study also showed that it was difficult for ortho/meta-hydroxyl groups to chelate with H₃BO₃ and other polyborates, and the chelates mainly had good chelating properties with B(OH)₄^-, and the chelates formed had large steric hindrance. At the same time, increasing the number of hydroxyl groups of functional monomers was beneficial to increase the adsorption capacity of materials. In addition, the cyclic adsorption/desorption experiments showed that DPUs have good cyclic stability. At the same time, the adsorption results of the original salt lake brine showed that other metal ions in the brine had little effect on the adsorption of boron, and the adsorption capacity was as high as 52.93 mg·g^-1, and the maximum adsorption capacity was obtained by Adams-Bohart model to 58.80 mg·g^-1. The outstanding selectivity and adsorption capacity of these materials have broad potential application, and are expected to be used for the efficient adsorption and removal in boron-containing water bodies.

Key words: Boron, Adsorbent, Dendritic polyurethane, Chelation

摘要： Boron adsorbents with high adsorption capacities have long been a focus of research for a long time. This study used small molecular polyols with different hydroxyl groups as functional monomers and as end-capping agents, functional dendritic polyurethanes with nano structure were successfully prepared by one-pot method. The single molecule size and surface morphology were characterized by dynamic light scattering, transmission electron microscopy and scanning electron microscopy, and the molecular size in the dry state was 11 to 18 nm. The prepared materials were used as the boron adsorbents, and the effects of pH, time, boron solution concentration and temperature on the adsorption were studied. The results showed that the capacity of adsorbed boron could reach 110-130 mg·g^-1. Adsorption was a homogeneous monolayer adsorption controlled by chemisorption, and adsorption thermodynamics showed that was a spontaneous endothermic process. Adsorption behavior was best described by the pseudo-second-order kinetic model and the Langmuir isotherm. This study also showed that it was difficult for ortho/meta-hydroxyl groups to chelate with H₃BO₃ and other polyborates, and the chelates mainly had good chelating properties with B(OH)₄^-, and the chelates formed had large steric hindrance. At the same time, increasing the number of hydroxyl groups of functional monomers was beneficial to increase the adsorption capacity of materials. In addition, the cyclic adsorption/desorption experiments showed that DPUs have good cyclic stability. At the same time, the adsorption results of the original salt lake brine showed that other metal ions in the brine had little effect on the adsorption of boron, and the adsorption capacity was as high as 52.93 mg·g^-1, and the maximum adsorption capacity was obtained by Adams-Bohart model to 58.80 mg·g^-1. The outstanding selectivity and adsorption capacity of these materials have broad potential application, and are expected to be used for the efficient adsorption and removal in boron-containing water bodies.

关键词: Boron, Adsorbent, Dendritic polyurethane, Chelation

Pengyu Sun, Feiyu Gao, Wei Shi, Hengyuan Zhang, Shiao Du, Wei Chen, Meng Li. Preparation and application of nano dendritic polyurethane for high-efficiency boron adsorption[J]. Chinese Journal of Chemical Engineering, 2025, 82(6): 209-221.

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Preparation and application of nano dendritic polyurethane for high-efficiency boron adsorption

Preparation and application of nano dendritic polyurethane for high-efficiency boron adsorption

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