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Secondary particle size determining sedimentation and adsorption kinetics of titanate-based materials for ammonia nitrogen and methylene blue removal

Zhang, Wenlong, Huo, Changjiang, Hou, Bo ORCID: https://orcid.org/0000-0001-9918-8223, Lin, Changzheng, Yan, Xuanye, Feng, Jiangtao and Yan, Wei 2021. Secondary particle size determining sedimentation and adsorption kinetics of titanate-based materials for ammonia nitrogen and methylene blue removal. Journal of Molecular Liquids 343 , 117026. 10.1016/j.molliq.2021.117026

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Abstract

The effect of the main size distribution of particles on the adsorption process for adsorbent materials has been well-recognized; however, the impact of secondary particle size (agglomerated, aggregated or hydrated ones) on adsorbent properties and performance was rarely reported so far. In this study, a series of sodium titanates (STs) and peroxide modified sodium titanates (PSTs) with different primary particle sizes, and secondary sizes are synthesized by controlling synthesis conditions and subsequently applied to batch adsorption experiment. By employing scanning electron microscopes and Laser particle size analyzers, the particle sizes of STs and PSTs are found to be closely correlated with synthesis conditions. The surface morphology and specific surface area of titanates are size-dependent, while the components of all the samples maintained constant. The sedimentation experiment and CFD simulation demonstrated that particles with larger secondary sizes tended to settle more quickly than those with a bigger size. PSTs or STs particles with smaller secondary sizes could reach equilibrium more rapidly than those with the bigger size. The fitting results from Elovich and Weber-Morris models demonstrated that the particle sizes affect kinetics mainly through the liquid film diffusion process within the initial stages.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Elsevier
ISSN: 0167-7322
Date of First Compliant Deposit: 29 July 2021
Date of Acceptance: 14 July 2021
Last Modified: 05 Nov 2022 22:01
URI: https://orca.cardiff.ac.uk/id/eprint/143025

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