{"title":"Nearly monodisperse ZnS nanoparticles for portable recognition, enrichment and detection of Cd(II)","authors":"Jianrong Guo , Juan Wu , Junhui He , Yan Xue","doi":"10.1016/j.colsurfa.2023.132532","DOIUrl":null,"url":null,"abstract":"<div><p><span>As cadmium ions (Cd</span><sup>2+</sup>) pose a serious threat to environment and human health, it is significant to develop portable, fast-response and sensitive Cd<sup>2+</sup><span> sensors for both real-time and on-site collection of such critical information. In this study, nearly monodisperse ZnS nanoparticles (NPs) were prepared and used to recognize, enrich and detect Cd</span><sup>2+</sup><span> ions. ZnS NPs demonstrated fast adsorption kinetics towards Cd</span><sup>2+</sup> ions (removing 99.3 % of Cd<sup>2+</sup> in 12 min), surpassing previously reported multiple Cd<sup>2+</sup> adsorption materials. Upon adsorbing Cu<sup>2+</sup> and Cd<sup>2+</sup><span> ions via substitution reaction, ZnS NPs gain strong peroxidase activity, and demonstrate the ability to selectively detect Cu</span><sup>2+</sup> and Cd<sup>2+</sup><span> ions among common metal ions<span>. By further conjugating with our previous HSnS NFs (Hollow SnS nanoflower) nanosensor to eliminate the interference of Cu</span></span><sup>2+</sup>, the ZnS NPs nanosensor could selectively detect Cd<sup>2+</sup> ions with recoveries above 80 %. The ZnS NPs nanosensor can cover a wide range of Cd<sup>2+</sup> concentration from 0.5 to 100 μg L<sup>−1</sup> with an extremely low detection limit of 0.38 μg L<sup>−1</sup>. When coupling to a portable RGB sensor, as low as 0.5 μg L<sup>−1</sup> Cd<sup>2+</sup> ions could be reached on-site for river water, giving an outstanding recovery of 99.4 %. The current results provide a new avenue to the on-site detection of Cd<sup>2+</sup> ions, and would doubtlessly contribute to the future construction of portable and intelligent sensor arrays towards complex environmental samples.</p></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":null,"pages":null},"PeriodicalIF":4.9000,"publicationDate":"2023-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0927775723016163","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
As cadmium ions (Cd2+) pose a serious threat to environment and human health, it is significant to develop portable, fast-response and sensitive Cd2+ sensors for both real-time and on-site collection of such critical information. In this study, nearly monodisperse ZnS nanoparticles (NPs) were prepared and used to recognize, enrich and detect Cd2+ ions. ZnS NPs demonstrated fast adsorption kinetics towards Cd2+ ions (removing 99.3 % of Cd2+ in 12 min), surpassing previously reported multiple Cd2+ adsorption materials. Upon adsorbing Cu2+ and Cd2+ ions via substitution reaction, ZnS NPs gain strong peroxidase activity, and demonstrate the ability to selectively detect Cu2+ and Cd2+ ions among common metal ions. By further conjugating with our previous HSnS NFs (Hollow SnS nanoflower) nanosensor to eliminate the interference of Cu2+, the ZnS NPs nanosensor could selectively detect Cd2+ ions with recoveries above 80 %. The ZnS NPs nanosensor can cover a wide range of Cd2+ concentration from 0.5 to 100 μg L−1 with an extremely low detection limit of 0.38 μg L−1. When coupling to a portable RGB sensor, as low as 0.5 μg L−1 Cd2+ ions could be reached on-site for river water, giving an outstanding recovery of 99.4 %. The current results provide a new avenue to the on-site detection of Cd2+ ions, and would doubtlessly contribute to the future construction of portable and intelligent sensor arrays towards complex environmental samples.
期刊介绍:
Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena.
The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.