{"title":"Synthesis of bifunctional silica aerogels for robust and simultaneous removal of Hg(II) and malachite green: Performance and mechanism","authors":"","doi":"10.1016/j.seppur.2024.129773","DOIUrl":null,"url":null,"abstract":"<div><div>The pollution of heavy metal ions and dyes to water endanger the ecosystem and public health. Adsorption has been widely used for the removal of water pollutants because of its low cost and simple operation. Herein, a family of nitrogen- and sulfur-containing bifunctional silica aerogels with different structure and composition were prepared for robust and simultaneous removal of Hg(II) and malachite green (MG). The optimal adsorption pH for Hg(II) and MG are 6 and 10, and the maximum adsorption capacity are 215.35 and 1227.14 mg·g<sup>−1</sup>. The adsorption kinetic and isotherm process can be described by pseudo-second-order and Langmuir model. The aerogels can simultaneous removal Hg(II) and MG efficiently. They also exhibit impressive affinity and adsorption selectivity for Hg(II) and MG with the existence of multiple contaminants and high saline environments. Adsorption mechanism implies the adsorption for Hg(II) mainly depends on the interaction with amino and sulfur groups, while the binding of MG mainly depends on the formation of hydrogen bonds. The aerogels display satisfactory adsorption performance in real water sample and good reusability. The regeneration rate can maintain 91.50 % and 90.23 % for Hg(II) and MG after five regeneration cycles. The work may provide efficient bifunctional silica aerogels for the simultaneous decontamination metal ions and dyes with practical application.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":null,"pages":null},"PeriodicalIF":8.1000,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Separation and Purification Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1383586624035123","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The pollution of heavy metal ions and dyes to water endanger the ecosystem and public health. Adsorption has been widely used for the removal of water pollutants because of its low cost and simple operation. Herein, a family of nitrogen- and sulfur-containing bifunctional silica aerogels with different structure and composition were prepared for robust and simultaneous removal of Hg(II) and malachite green (MG). The optimal adsorption pH for Hg(II) and MG are 6 and 10, and the maximum adsorption capacity are 215.35 and 1227.14 mg·g−1. The adsorption kinetic and isotherm process can be described by pseudo-second-order and Langmuir model. The aerogels can simultaneous removal Hg(II) and MG efficiently. They also exhibit impressive affinity and adsorption selectivity for Hg(II) and MG with the existence of multiple contaminants and high saline environments. Adsorption mechanism implies the adsorption for Hg(II) mainly depends on the interaction with amino and sulfur groups, while the binding of MG mainly depends on the formation of hydrogen bonds. The aerogels display satisfactory adsorption performance in real water sample and good reusability. The regeneration rate can maintain 91.50 % and 90.23 % for Hg(II) and MG after five regeneration cycles. The work may provide efficient bifunctional silica aerogels for the simultaneous decontamination metal ions and dyes with practical application.
期刊介绍:
Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.