Sorption kinetics, isotherms, and mechanism of aniline aerofloat to agricultural soils with various physicochemical properties

Lei XIANG, Tao XIAO, Ce-Hui MO, Hai-Ming ZHAO, Yan-Wen LI, Hui LI, Quan-Ying CAI, Dong-Mei ZHOU, Ming Hung WONG

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Aniline aerofloat (AAF), a high-toxic organic flotation reagent, is widely used in mineral processing industry. However, little information on its environmental fate is available. AAF sorption to four types of agricultural soils at low concentrations (1–10 mg/L) was investigated using batch experiments. AAF sorption kinetics involved both boundary layer diffusion and intraparticle diffusion, following pseudo-second-order kinetics with equilibrium time within 120 min. Both Langmuir and Freundlich models fitted well the AAF sorption with the former better. Sorption of AAF to soils was a spontaneous and favorable physical sorption that was controlled by ion bridge effect and hydrophobic interaction that was related to van der Waals force and π-π coordination based on FTIR analyses. AAF sorption was remarkably affected by soil constituents, positively correlating with the contents of organic matter and clay. The relatively higher logKoc values (3.53–4.66) of AAF at environmental concentrations (1–5 mg/L) imply that soils are serving as a sink of AAF from beneficiation wastewater, posing great potential risks to environment and human health. Copyright © 2018 Elsevier Inc. All rights reserved.
Original languageEnglish
Pages (from-to)84-91
JournalEcotoxicology and Environmental Safety
Volume154
Early online dateFeb 2018
DOIs
Publication statusPublished - 2018

Fingerprint

Aniline
Isotherms
Sorption
Soil
Soils
Kinetics
Van der Waals forces
Beneficiation
Ore treatment
aniline
Poisons
Fourier Transform Infrared Spectroscopy
Waste Water
Flotation
Hydrophobic and Hydrophilic Interactions
Biological materials
Minerals
Industry
Clay
Boundary layers

Citation

Xiang, L., Xiao, T., Mo, C.-H., Zhao, H.-M., Li, Y.-W., Li, H., . . . Wong, M.-H. (2018). Sorption kinetics, isotherms, and mechanism of aniline aerofloat to agricultural soils with various physicochemical properties. Ecotoxicology and Environmental Safety, 154, 84-91. doi: 10.1016/j.ecoenv.2018.01.032

Keywords

  • Organic flotation reagent
  • Aniline aerofloat (AAF)
  • Sorption
  • Agricultural soils
  • Mechanism