Adsorption of BTX from aqueous solutions by Na-P1 zeolite obtained from fly ash

• Published in: Process safety and environmental protection Vol. 109; pp. 214 - 223
• Main Authors: Bandura, Lidia, Kołodyńska, Dorota, Franus, Wojciech
• Format: Journal Article
• Language: English
• Published: Rugby Elsevier B.V 01.07.2017; Elsevier Science Ltd
• Subjects: Adsorption; Adsorption isotherms; Adsorption kinetics; Aqueous solutions; Benzene; BTX removal; Chemical synthesis; Fly ash; Isotherms; Kinetics; p-Xylene; Reaction kinetics; Scanning electron microscopy; Sorption; Synthetic zeolites; Toluene; Ultrasonic testing; Water treatment; X-ray diffraction; Xylene; Zeolite Na-P1; Zeolites; Water treatment; Synthetic zeolites; Adsorption kinetics; Adsorption isotherms; Zeolite Na-P1; BTX removal
• ISSN: 0957-5820; 1744-3598
• DOI: 10.1016/j.psep.2017.03.036

•BTX sorption on zeolite Na-P1 from F-class fly ash was studied.•Sorption efficiency was dependent on BTX initial concentration.•Sorption of BTX followed the order: xylenes>toluene>benzene. The adsorption of BTX (benzene, toluene, o- and p-xylene) from aqueous solution by synthetic zeolite Na-P1 obtained from fly ash was examined. The adsorbent was characterized by scanning electron microscope (SEM-EDS) and X-ray diffraction (XRD). Surface area and pore volume distribution were determined using a nitrogen adsorption/desorption isotherm. BTX adsorption tests, including the influence of contact time, sorption isotherms and the influence of initial concentration, were performed in a batch multicomponent system. The sorption capacity followed the order xylenes>toluene>benzene, and the removal efficiency decreased with an increase in initial BTX concentration. The process kinetics was evaluated using pseudo-first-order, pseudo-second-order and intraparticle diffusion models. The adsorption equilibrium was reached within 24h and followed pseudo-second-order kinetics. The Langmuir, Freundlich and Temkin models were used to evaluate the adsorption capacity of Na-P1. The Langmuir model was found to be the most suitable for all BTX sorption from a multicomponent system. The calculated maximum adsorption capacities of Na-P1 (qmax) for benzene, toluene, o- and p-xylene were 0.032, 0.050, 0.147 and 0.129 respectively.