دورية أكاديمية
أعرض في EDS

Low-Temperature Synthesis of Magnetic Carbonaceous Materials Coated with Nanosilica for Rapid Adsorption of Methylene Blue.

التفاصيل البيبلوغرافية
العنوان: Low-Temperature Synthesis of Magnetic Carbonaceous Materials Coated with Nanosilica for Rapid Adsorption of Methylene Blue.
المؤلفون: Mittal H; Department of Chemical Engineering, Khalifa University of Science and Technology, P.O. Box 2533, Abu Dhabi, United Arab Emirates., Babu R; Department of Chemical Engineering, Khalifa University of Science and Technology, P.O. Box 2533, Abu Dhabi, United Arab Emirates., Dabbawala AA; Department of Chemical Engineering, Khalifa University of Science and Technology, P.O. Box 2533, Abu Dhabi, United Arab Emirates., Alhassan SM; Department of Chemical Engineering, Khalifa University of Science and Technology, P.O. Box 2533, Abu Dhabi, United Arab Emirates.
المصدر: ACS omega [ACS Omega] 2020 Mar 16; Vol. 5 (11), pp. 6100-6112. Date of Electronic Publication: 2020 Mar 16 (Print Publication: 2020).
نوع المنشور: Journal Article
اللغة: English
بيانات الدورية: Publisher: American Chemical Society Country of Publication: United States NLM ID: 101691658 Publication Model: eCollection Cited Medium: Internet ISSN: 2470-1343 (Electronic) Linking ISSN: 24701343 NLM ISO Abbreviation: ACS Omega Subsets: PubMed not MEDLINE
أسماء مطبوعة: Original Publication: Washington, D.C. : American Chemical Society, [2016]-
مستخلص: This work reports the synthesis of nanosilica-coated magnetic carbonaceous adsorbents (MCA@SiO 2 ) using low-temperature hydrothermal carbonization technique (HCT) and the feasibility to utilize it for methylene blue (MB) adsorption. Initially, a carbon precursor (CP) was synthesized from corn starch under saline conditions at 453 K via HCT followed by the magnetization of CP again via HCT at 453 K. Subsequently, MCA was coated with silica nanoparticles. MCA and MCA@SiO 2 were characterized using X-ray diffraction, Fourier transform infrared, scanning electron microscopy/energy-dispersive spectroscopy, transmission electron microscopy, and Brunauer-Emmett-Teller (BET) N 2 adsorption-desorption isotherms. The BET surface area of MCA and MCA@SiO 2 were found to be 118 and 276 m 2 g -1 , respectively. Adsorption of MB onto MCA@SiO 2 was performed using batch adsorption studies and in the optimum condition, MCA@SiO 2 showed 99% adsorption efficiency with 0.5 g L -1 of MCA@SiO 2 at pH 7. Adsorption isotherm studies predicted that MB adsorption onto MCA@SiO 2 was homogeneous monolayer adsorption, which was best described using a Langmuir model with the maximum adsorption capacity of 516.9 mg g -1 at 25 °C. During adsorption kinetics, a rapid dye removal was observed which followed pseudo-first- as well as pseudo-second-order models, which suggested that MB dye molecules were adsorbed onto MCA@SiO 2 via both ion exchange as well as the chemisorption process. The endothermic and spontaneous nature of the adsorption of MB onto MCA@SiO 2 was established by thermodynamics studies. Mechanism of dye diffusion was collectively governed by intraparticle diffusion and film diffusion processes. Furthermore, MB was also selectively adsorbed from its mixture with an anionic dye, that is, methyl orange. Column adsorption studies showed that approximately 500 mL of MB having 50 mg L -1 concentration can be treated with 0.5 g L -1 of MCA@SiO 2 . Furthermore, MCA@SiO 2 was repeatedly used for 20 cycles of adsorption-desorption of MB. Therefore, MCA@SiO 2 can be effectively utilized in cationic dye-contaminated wastewater remediation applications.
Competing Interests: The authors declare no competing financial interest.
(Copyright © 2020 American Chemical Society.)
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تواريخ الأحداث: Date Created: 20200401 Latest Revision: 20200928
رمز التحديث: 20221213
مُعرف محوري في PubMed: PMC7098013
DOI: 10.1021/acsomega.0c00093
PMID: 32226893
قاعدة البيانات: MEDLINE
الوصف
تدمد:2470-1343
DOI:10.1021/acsomega.0c00093