{"title":"通过 K2FeO4 和 KMnO4 改性提高锰分子筛的效率:优化和机理认识","authors":"Kai Li, Yingming Guo, Yuanyuan Cao, Manman Cao","doi":"10.1007/s11164-024-05402-6","DOIUrl":null,"url":null,"abstract":"<p>Potassium permanganate (KMnO<sub>4</sub>) and potassium ferrate (K<sub>2</sub>FeO<sub>4</sub>) were used as modifiers to modify molecular sieves, and the modification periods were 35 days (KMnO<sub>4</sub>) and 27 days (K<sub>2</sub>FeO<sub>4</sub>), respectively. About 1 mol/L NaOH was used to pretreat the molecular sieves during the modification process of K<sub>2</sub>FeO<sub>4</sub>, and the modification period was further shortened to 22 days. After modification, modified molecular sieve (MMS) could effectively and continuously remove ammonium (NH<sub>4</sub><sup>+</sup>) and manganese ions (Mn<sup>2+</sup>) from water. The adsorption kinetics showed that the adsorption of NH<sub>4</sub><sup>+</sup> and Mn<sup>2+</sup> by MMS conformed to the quasi-secondary kinetic model adsorption kinetic model, and the adsorption process was mainly chemisorption. During the modification process, SEM, EDS, BET and XPS were used to investigate the structural characteristics of MMS. In the modification mechanism of molecular sieve, lattice oxygen (referred to as O<sub>α</sub>), Mn (II), and Mn (III) accelerated the oxidation of Mn<sup>2+</sup> to Mn<sup>4+</sup> and promoted the rapid formation of active manganese oxide, which played a key role in shortening the modification period of MMS. This study contributes to a better understanding of the preparation and performance of MMS through a comprehensive analysis of the optimized molecular sieve modification process and the exploration of the accelerated formation mechanism of active manganese oxide.</p>","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":null,"pages":null},"PeriodicalIF":2.8000,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Enhanced efficiency of manganese molecular sieves through K2FeO4 and KMnO4 modification: optimization and mechanistic insights\",\"authors\":\"Kai Li, Yingming Guo, Yuanyuan Cao, Manman Cao\",\"doi\":\"10.1007/s11164-024-05402-6\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Potassium permanganate (KMnO<sub>4</sub>) and potassium ferrate (K<sub>2</sub>FeO<sub>4</sub>) were used as modifiers to modify molecular sieves, and the modification periods were 35 days (KMnO<sub>4</sub>) and 27 days (K<sub>2</sub>FeO<sub>4</sub>), respectively. About 1 mol/L NaOH was used to pretreat the molecular sieves during the modification process of K<sub>2</sub>FeO<sub>4</sub>, and the modification period was further shortened to 22 days. After modification, modified molecular sieve (MMS) could effectively and continuously remove ammonium (NH<sub>4</sub><sup>+</sup>) and manganese ions (Mn<sup>2+</sup>) from water. The adsorption kinetics showed that the adsorption of NH<sub>4</sub><sup>+</sup> and Mn<sup>2+</sup> by MMS conformed to the quasi-secondary kinetic model adsorption kinetic model, and the adsorption process was mainly chemisorption. During the modification process, SEM, EDS, BET and XPS were used to investigate the structural characteristics of MMS. In the modification mechanism of molecular sieve, lattice oxygen (referred to as O<sub>α</sub>), Mn (II), and Mn (III) accelerated the oxidation of Mn<sup>2+</sup> to Mn<sup>4+</sup> and promoted the rapid formation of active manganese oxide, which played a key role in shortening the modification period of MMS. This study contributes to a better understanding of the preparation and performance of MMS through a comprehensive analysis of the optimized molecular sieve modification process and the exploration of the accelerated formation mechanism of active manganese oxide.</p>\",\"PeriodicalId\":753,\"journal\":{\"name\":\"Research on Chemical Intermediates\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.8000,\"publicationDate\":\"2024-09-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Research on Chemical Intermediates\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://doi.org/10.1007/s11164-024-05402-6\",\"RegionNum\":3,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Research on Chemical Intermediates","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1007/s11164-024-05402-6","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
Enhanced efficiency of manganese molecular sieves through K2FeO4 and KMnO4 modification: optimization and mechanistic insights
Potassium permanganate (KMnO4) and potassium ferrate (K2FeO4) were used as modifiers to modify molecular sieves, and the modification periods were 35 days (KMnO4) and 27 days (K2FeO4), respectively. About 1 mol/L NaOH was used to pretreat the molecular sieves during the modification process of K2FeO4, and the modification period was further shortened to 22 days. After modification, modified molecular sieve (MMS) could effectively and continuously remove ammonium (NH4+) and manganese ions (Mn2+) from water. The adsorption kinetics showed that the adsorption of NH4+ and Mn2+ by MMS conformed to the quasi-secondary kinetic model adsorption kinetic model, and the adsorption process was mainly chemisorption. During the modification process, SEM, EDS, BET and XPS were used to investigate the structural characteristics of MMS. In the modification mechanism of molecular sieve, lattice oxygen (referred to as Oα), Mn (II), and Mn (III) accelerated the oxidation of Mn2+ to Mn4+ and promoted the rapid formation of active manganese oxide, which played a key role in shortening the modification period of MMS. This study contributes to a better understanding of the preparation and performance of MMS through a comprehensive analysis of the optimized molecular sieve modification process and the exploration of the accelerated formation mechanism of active manganese oxide.
期刊介绍:
Research on Chemical Intermediates publishes current research articles and concise dynamic reviews on the properties, structures and reactivities of intermediate species in all the various domains of chemistry.
The journal also contains articles in related disciplines such as spectroscopy, molecular biology and biochemistry, atmospheric and environmental sciences, catalysis, photochemistry and photophysics. In addition, special issues dedicated to specific topics in the field are regularly published.