Ultrasonic enhanced adsorption of methylene blue onto the optimized surface area of activated carbon: Adsorption isotherm, kinetics and thermodynamics

Autor:	Ambali Saka Abdulkareem, A. S. Kovo, M. Auta, Titus Chinedu Egbosiuba, Jimoh O. Tijani, E.A. Afolabi, W. D. Roos
Rok vydání:	2020
Předmět:	Materials science General Chemical Engineering Sonication Langmuir adsorption model Thermodynamics 02 engineering and technology General Chemistry 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Endothermic process symbols.namesake Adsorption Biochar medicine symbols Thermal stability 0210 nano-technology Pyrolysis 0105 earth and related environmental sciences Activated carbon medicine.drug
Zdroj:	Chemical Engineering Research and Design. 153:315-336
ISSN:	0263-8762
Popis:	In this study, the influence of pyrolysis time and temperature on yield, fixed carbon and physicochemical properties of the biochar produced from Empty Fruit Bunch (EFB) were investigated. Response Surface Methodology was utilized to optimize the influence of process parameters on the surface area of activated carbon produced from the biochar in the absence and presence of ultrasonication and was coded EFB-AC and EFB-UAC respectively. The EFB-AC and EFB-UAC were characterized using BET, TGA, HRSEM, XRD, FTIR and XPS. The batch adsorption behavior of MB onto EFB-AC and EFB-UAC was evaluated. The results revealed that the optimum surface area (SBET) of 2114 m2/g was achieved for EFB-UAC at activation temperature (600 °C), activation time (45 min) and KOH concentration (1.5 M). It was found that EFB-UAC has high surface area, better thermal stability, better pores development and improved surface chemistry compared to the EFB-AC. The maximum adsorption of MB occurred at pH (10), adsorbent dosage (30 mg), contact time (40 min), Temperature (50 °C) and MB initial concentration (50 mg/L). The experimental data was best described by Langmuir isotherm model, having an adsorption capacity of 400 mg/g and 435 mg/g for EFB-AC and EFB-UAC, respectively. The kinetic model was best suited by pseudo-second order model for MB adsorption onto EFB-AC and EFB-UAC. The thermodynamics investigation showed that adsorption of MB was endothermic in nature due to strong electrostatic interaction and formation of hydrogen bonding. The study revealed that ultrasonic assisted variations of the adsorption parameters significantly improved the adsorption of MB onto EFB-AC and EFB-UAC.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ac2ee48a96eee8a24708659027f045b1 https://doi.org/10.1016/j.cherd.2019.10.016 Zobrazit plný text záznamu Full Text from ScienceDirect Plný text ve formátu HTML
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