TEMPO-Oxidized Cellulose Hydrogels Loaded with Copper Nanoparticles as Highly Efficient and Reusable Catalysts for Organic Pollutant Reduction
To successfully prepare cellulose hydrogels through a dissolution–regeneration process, 60 wt% LiBr aqueous solution was used as a green solvent. Carboxyl groups were precisely introduced onto the surface of the cellulose hydrogels through a TEMPO-mediated oxidation reaction, while the three-dimensi...
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MDPI AG
2025-07-01
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| author | Yangyang Zhang Yuanyuan Li Xuejun Yu |
| author_facet | Yangyang Zhang Yuanyuan Li Xuejun Yu |
| author_sort | Yangyang Zhang |
| collection | DOAJ |
| description | To successfully prepare cellulose hydrogels through a dissolution–regeneration process, 60 wt% LiBr aqueous solution was used as a green solvent. Carboxyl groups were precisely introduced onto the surface of the cellulose hydrogels through a TEMPO-mediated oxidation reaction, while the three-dimensional network structure and open pore morphology were completely retained. This modification strategy significantly enhanced the loading capacity of the hydrogels with copper nanoparticles (Cu NPs). The experimental results show that the LiBr aqueous solution can efficiently dissolve cellulose, and the TEMPO oxidation introduces carboxyl groups without destroying the stability of the hydrogels. Cu NPs are uniformly dispersed and highly loaded on the surface of the hydrogel because of the anchoring effect of the carboxyl groups. Cu NP-loaded hydrogels exhibit excellent catalytic activity in the NaBH<sub>4</sub> reduction of 4-nitrophenol (4-NP). Cu NP-loaded hydrogels maintain their complete structure and good catalytic performance after five consecutive cycles. Moreover, Cu NP-loaded hydrogels demonstrate high efficiency in degrading organic dyes such as methyl orange and Congo red. This study successfully developed efficient, low-cost, and environmentally friendly Cu NP-loaded hydrogel catalysts through the synergistic effect of LiBr green solvent and TEMPO oxidation modification, providing a feasible alternative to noble metal catalysts. |
| format | Article |
| id | doaj-art-2803a0fb2ef549c99aa717d93c110a22 |
| institution | Matheson Library |
| issn | 2310-2861 |
| language | English |
| publishDate | 2025-07-01 |
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| series | Gels |
| spelling | doaj-art-2803a0fb2ef549c99aa717d93c110a222025-07-25T13:23:54ZengMDPI AGGels2310-28612025-07-0111751210.3390/gels11070512TEMPO-Oxidized Cellulose Hydrogels Loaded with Copper Nanoparticles as Highly Efficient and Reusable Catalysts for Organic Pollutant ReductionYangyang Zhang0Yuanyuan Li1Xuejun Yu2Bamboo Industry Institute, Zhejiang A&F University, Hangzhou 311300, ChinaBamboo Industry Institute, Zhejiang A&F University, Hangzhou 311300, ChinaBamboo Industry Institute, Zhejiang A&F University, Hangzhou 311300, ChinaTo successfully prepare cellulose hydrogels through a dissolution–regeneration process, 60 wt% LiBr aqueous solution was used as a green solvent. Carboxyl groups were precisely introduced onto the surface of the cellulose hydrogels through a TEMPO-mediated oxidation reaction, while the three-dimensional network structure and open pore morphology were completely retained. This modification strategy significantly enhanced the loading capacity of the hydrogels with copper nanoparticles (Cu NPs). The experimental results show that the LiBr aqueous solution can efficiently dissolve cellulose, and the TEMPO oxidation introduces carboxyl groups without destroying the stability of the hydrogels. Cu NPs are uniformly dispersed and highly loaded on the surface of the hydrogel because of the anchoring effect of the carboxyl groups. Cu NP-loaded hydrogels exhibit excellent catalytic activity in the NaBH<sub>4</sub> reduction of 4-nitrophenol (4-NP). Cu NP-loaded hydrogels maintain their complete structure and good catalytic performance after five consecutive cycles. Moreover, Cu NP-loaded hydrogels demonstrate high efficiency in degrading organic dyes such as methyl orange and Congo red. This study successfully developed efficient, low-cost, and environmentally friendly Cu NP-loaded hydrogel catalysts through the synergistic effect of LiBr green solvent and TEMPO oxidation modification, providing a feasible alternative to noble metal catalysts.https://www.mdpi.com/2310-2861/11/7/512cellulose hydrogelsCu nanoparticlesTEMPO-mediated oxidationreusable catalyst |
| spellingShingle | Yangyang Zhang Yuanyuan Li Xuejun Yu TEMPO-Oxidized Cellulose Hydrogels Loaded with Copper Nanoparticles as Highly Efficient and Reusable Catalysts for Organic Pollutant Reduction Gels cellulose hydrogels Cu nanoparticles TEMPO-mediated oxidation reusable catalyst |
| title | TEMPO-Oxidized Cellulose Hydrogels Loaded with Copper Nanoparticles as Highly Efficient and Reusable Catalysts for Organic Pollutant Reduction |
| title_full | TEMPO-Oxidized Cellulose Hydrogels Loaded with Copper Nanoparticles as Highly Efficient and Reusable Catalysts for Organic Pollutant Reduction |
| title_fullStr | TEMPO-Oxidized Cellulose Hydrogels Loaded with Copper Nanoparticles as Highly Efficient and Reusable Catalysts for Organic Pollutant Reduction |
| title_full_unstemmed | TEMPO-Oxidized Cellulose Hydrogels Loaded with Copper Nanoparticles as Highly Efficient and Reusable Catalysts for Organic Pollutant Reduction |
| title_short | TEMPO-Oxidized Cellulose Hydrogels Loaded with Copper Nanoparticles as Highly Efficient and Reusable Catalysts for Organic Pollutant Reduction |
| title_sort | tempo oxidized cellulose hydrogels loaded with copper nanoparticles as highly efficient and reusable catalysts for organic pollutant reduction |
| topic | cellulose hydrogels Cu nanoparticles TEMPO-mediated oxidation reusable catalyst |
| url | https://www.mdpi.com/2310-2861/11/7/512 |
| work_keys_str_mv | AT yangyangzhang tempooxidizedcellulosehydrogelsloadedwithcoppernanoparticlesashighlyefficientandreusablecatalystsfororganicpollutantreduction AT yuanyuanli tempooxidizedcellulosehydrogelsloadedwithcoppernanoparticlesashighlyefficientandreusablecatalystsfororganicpollutantreduction AT xuejunyu tempooxidizedcellulosehydrogelsloadedwithcoppernanoparticlesashighlyefficientandreusablecatalystsfororganicpollutantreduction |