Comparison of Cr(VI) Adsorption Using Synthetic Schwertmannite Obtained by Fe3+ Hydrolysis and Fe2+ Oxidation: Kinetics, Isotherms and Adsorption Mechanism
| العنوان: | Comparison of Cr(VI) Adsorption Using Synthetic Schwertmannite Obtained by Fe3+ Hydrolysis and Fe2+ Oxidation: Kinetics, Isotherms and Adsorption Mechanism |
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| المؤلفون: | Łukasz Stala, Justyna Ulatowska, Izabela Polowczyk |
| المصدر: | International Journal of Molecular Sciences, Vol 22, Iss 8175, p 8175 (2021) International Journal of Molecular Sciences Volume 22 Issue 15 |
| بيانات النشر: | MDPI AG, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Langmuir, Cr(VI), schwertmannite, QH301-705.5, Inorganic chemistry, 02 engineering and technology, 010501 environmental sciences, Ferric Compounds, 01 natural sciences, Article, Catalysis, Inorganic Chemistry, symbols.namesake, Adsorption, Specific surface area, isotherm models, pollution, Freundlich equation, Physical and Theoretical Chemistry, Biology (General), Molecular Biology, QD1-999, Spectroscopy, 0105 earth and related environmental sciences, Ion exchange, Chemistry, Hydrolysis, Schwertmannite, Organic Chemistry, Langmuir adsorption model, Sorption, General Medicine, 021001 nanoscience & nanotechnology, Computer Science Applications, iron-based sorbents, symbols, Potassium Dichromate, 0210 nano-technology, Oxidation-Reduction, Iron Compounds, adsorption kinetics |
| الوصف: | Good sorption properties and simple synthesis route make schwertmannite an increasingly popular adsorbent. In this work, the adsorption properties of synthetic schwertmannite towards Cr(VI) were investigated. This study aimed to compare the properties and sorption performance of adsorbents obtained by two methods: Fe3+ hydrolysis (SCHA) and Fe2+ oxidation (SCHB). To characterise the sorbents before and after Cr(VI) adsorption, specific surface area, particle size distribution, density, and zeta potential were determined. Additionally, optical micrographs, SEM, and FTIR analyses were performed. Adsorption experiments were performed in varying process conditions: pH, adsorbent dosage, contact time, and initial concentration. Adsorption isotherms were fitted by Freundlich, Langmuir, and Temkin models. Pseudo-first-order, pseudo-second-order, intraparticle diffusion, and liquid film diffusion models were used to fit the kinetics data. Linear regression was used to estimate the parameters of isotherm and kinetic models. The maximum adsorption capacity resulting from the fitted Langmuir isotherm is 42.97 and 17.54 mg·g−1 for SCHA and SCHB. Results show that the adsorption kinetics follows the pseudo-second-order kinetic model. Both iron-based adsorbents are suitable for removing Cr(VI) ions from aqueous solutions. Characterisation of the adsorbents after adsorption suggests that Cr(VI) adsorption can be mainly attributed to ion exchange with SO42− groups. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 1661-6596 1422-0067 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b47577951783340888229620bcba3c3b https://www.mdpi.com/1422-0067/22/15/8175 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....b47577951783340888229620bcba3c3b |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 16616596 14220067 |
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