Nachaichot Atipong, Kenvised Orrawin, Choram Sirikanlaya, Nijpanich Supinya, Budsombat Surangkhana
Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University Khon Kaen 40002 Thailand
Synchrotron Light Research Institute (Public Organization) Nakhonratchasima 30000 Thailand.
RSC Adv. 2025 Mar 4;15(9):6974-6983. doi: 10.1039/d5ra00081e. eCollection 2025 Feb 26.
The effective removal of nitrophenols from wastewater is crucial due to their high carcinogenic risk. This research presents the development of a copper-based metal-organic framework (HKUST-1) integrated into a chitosan--poly(acrylic acid) hydrogel. The hydrogel composite was evaluated as a catalyst for reducing nitrophenols and dyes using sodium borohydride (NaBH) as a reducing agent. Various conditions were investigated for the reduction of 4-nitrophenol (4-NP) to the less harmful 4-aminophenol (4-AP), including catalyst dosage, NaBH concentration, initial 4-NP concentration, temperature, and pH. The catalyst was able to completely reduce 4-NP within 25 minutes at a dosage of 3 g L and a NaBH concentration of 300 mM. The reduction rate increased with higher temperatures, with an Arrhenius activation energy of 54.4 kJ mol. Common anions found in surface water, such as Cl, NO , SO , and HCO , had a slight impact on the reduction rate of 4-NP. When tested in real water environments, the reduction rate decreased, but complete conversion was still achieved. Additionally, the composite successfully reduced 100% of 2-nitrophenol, 100% of methyl orange, and 69% of Congo red. Overall, the hydrogel composite has shown significant potential as a catalyst for reducing various organic pollutants with high efficiency and easy separation through filtration.
由于硝基酚具有很高的致癌风险，因此从废水中有效去除硝基酚至关重要。本研究提出了一种集成到壳聚糖-聚丙烯酸水凝胶中的铜基金属有机框架（HKUST-1）的开发。以硼氢化钠（NaBH）作为还原剂，评估了该水凝胶复合材料作为还原硝基酚和染料的催化剂的性能。研究了将4-硝基酚（4-NP）还原为危害较小的4-氨基苯酚（4-AP）的各种条件，包括催化剂用量、NaBH浓度、初始4-NP浓度、温度和pH值。该催化剂在用量为3 g/L和NaBH浓度为300 mM的情况下，能够在25分钟内完全还原4-NP。还原速率随温度升高而增加，阿累尼乌斯活化能为54.4 kJ/mol。地表水中常见的阴离子，如Cl、NO、SO和HCO，对4-NP的还原速率有轻微影响。在实际水环境中测试时，还原速率下降，但仍实现了完全转化。此外，该复合材料成功地将2-硝基酚、甲基橙和刚果红分别100%、100%和69%还原。总体而言，该水凝胶复合材料作为一种催化剂，在高效还原各种有机污染物并通过过滤易于分离方面显示出巨大潜力。
