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Fixed-Bed Adsorption of Caffeine onto Thermally ModifiednVerde-lodo Bentonite 热改性 verde -lodo膨润土固定床吸附咖啡因的研究

Figshare Pub Date : 2018-12-12 DOI: 10.1021/acs.iecr.8b03734.s001

MariaFernanda Oliveira (6077615), Victor M. de Souza (6077618), Meuris G. C. da Silva (6077621), Melissa G. A. Vieira (6077624)

{"title":"Fixed-Bed Adsorption of Caffeine onto Thermally ModifiednVerde-lodo Bentonite","authors":"MariaFernanda Oliveira (6077615), Victor M. de Souza (6077618), Meuris G. C. da Silva (6077621), Melissa G. A. Vieira (6077624)","doi":"10.1021/acs.iecr.8b03734.s001","DOIUrl":"https://doi.org/10.1021/acs.iecr.8b03734.s001","url":null,"abstract":"Onlyna few studies regarding the adsorption of caffeine have beennpublished in the past years, and none of them has evaluated the fixed-bednadsorption of a pharmaceutical using bentonite. This work evaluatedncaffeine adsorption using the thermally modified bentonite Verde-lodonas adsorbent. The effects of flow operating rate and inlet caffeinenconcentration have been investigated through breakthrough curves.nMass transfer and efficiency parameters were calculated for each operatingncondition. The results obtained at 1 mL·min–1 and 0.2 mmol·L–1 showed a breakthrough timenof over 150 h and a removal percentage of approximately 100% untilnbreakthrough. The highest breakthrough and saturation adsorption capacitiesnwere 0.122 and 0.219 mmol·g–1, respectively,nfor the operating condition of 1 mL·min–1 andn1.0 mmol·L–1. The breakthrough curves werenremarkably described (R2 > 0.975) bynThomas,nYoon, and Nelson, and modified dose–response models. Moreover,nthermal, X-ray diffraction, Fourier transformed infrared spectroscopy,nand scanning electron microscopy analyses were performed in ordernto compare the calcined Verde-lodo clay before and after caffeinenadsorption, and they indicated the presence of the compound in thenadsorbent.","PeriodicalId":522309,"journal":{"name":"Figshare","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147894985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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