Gökçenur Selva Keleşoğlu, Mesut Özdi̇nçer, Aslıhan Dalmaz, Kübra Zenki̇n, S. Durmuş
{"title":"Green synthesis and structural characterization of ZnO nanoparticle and ZnO@TiO2 nanocomposite by Cinnamomum verum bark extract","authors":"Gökçenur Selva Keleşoğlu, Mesut Özdi̇nçer, Aslıhan Dalmaz, Kübra Zenki̇n, S. Durmuş","doi":"10.51435/turkjac.1395817","DOIUrl":"https://doi.org/10.51435/turkjac.1395817","url":null,"abstract":"In this work, we present a facile and efficient approach for the green synthesis of ZnO@TiO2 bimetallic oxide nanoparticles by exploiting the potential of Cinnamomum verum bark extract as a biogenic reducing agent. The synthesized nanoparticles were subjected to a comprehensive characterization process comprising various spectroscopic techniques. These techniques include X-ray diffraction analysis, Fourier transform infrared spectroscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy. Based on the results obtained, it highlights the potential of green-synthesized ZnO@TiO2 nanocomposite as a promising material for analytical applications.","PeriodicalId":486864,"journal":{"name":"Turkish journal of analytical chemistry","volume":"41 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138595206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Adsorption of hexavalent chromium from aqueous solution onto corn cobs – activated carbon","authors":"Pınar Bozbeyoglu, A. Gündoğdu","doi":"10.51435/turkjac.1394304","DOIUrl":"https://doi.org/10.51435/turkjac.1394304","url":null,"abstract":"This study evaluated the performance of a new activated carbon (CCs-AC) produced from corn cobs by boric acid activation for the effective removal of hexavalent chromium, a heavy metal with high potential to pollute the environment, from wastewater. For this purpose, with the help of parameters such as solution pH, contact time, initial Cr(VI) concentration, CCs-AC dose, desorption and temperature, the removal of Cr(VI) ions from aqueous solution by adsorption on CCs-AC was investigated from equilibrium, kinetic and thermodynamic point of view. As a result of the experiments, it was determined that the optimum solution pH was 2.0, the contact time was 4 hours, and the desorption solution was 3.0 M NaOH. From the kinetic data, it was determined that the adsorption was compatible with the pseudo-second order kinetic model and the maximum Cr(VI) adsorption capacity (123.7 mg/g) obtained from the Langmuir isotherm model showed that CCs-AC was of competitive quality with the literature. From the thermodynamic data, the positive ΔH value indicates that the adsorption is endothermic and the value of 12.00 kj/mol indicates that the adsorption is rather chemically driven. The negative ΔG value indicates that the process proceeds spontaneously with an increase in temperature, while the ΔS value indicates an increase in the amount of unused energy.","PeriodicalId":486864,"journal":{"name":"Turkish journal of analytical chemistry","volume":"35 27","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138601335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}