Pub Date : 2023-12-06DOI: 10.51435/turkjac.1395817
Gökçenur Selva Keleşoğlu, Mesut Özdi̇nçer, Aslıhan Dalmaz, Kübra Zenki̇n, S. Durmuş
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.
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Pub Date : 2023-12-04DOI: 10.51435/turkjac.1394304
Pınar Bozbeyoglu, A. Gündoğdu
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.
研究了硼酸活化玉米芯制备的新型活性炭(CCs-AC)对废水中六价铬(一种高污染环境的重金属)的去除效果。为此，借助溶液pH、接触时间、初始Cr(VI)浓度、cc - ac用量、解吸温度等参数，从平衡、动力学和热力学角度研究了cc - ac吸附对水溶液中Cr(VI)离子的去除作用。通过实验确定了最佳解吸液pH为2.0，接触时间为4 h，解吸液为3.0 M NaOH。动力学数据表明，CCs-AC的吸附符合拟二级动力学模型，Langmuir等温线模型得到的最大Cr(VI)吸附量为123.7 mg/g，与文献结果相媲美。从热力学数据来看，ΔH值为正表明吸附是吸热的，12.00 kj/mol值表明吸附是化学驱动的。负ΔG值表示该过程随着温度的升高而自发进行，而ΔS值表示未使用能量的数量增加。
{"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}
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