Utilizing low-cost natural waste for the removal of pharmaceuticals from water: Mechanisms, isotherms and kinetics at low concentrations

Yuan Li, Mark A. Taggart, Craig Mckenzie, Zulin Zhang, Yonglong Lu, Sabolc Pap, Stuart Gibb

Research output: Contribution to journalArticle

Abstract

The use of abundant natural wastes as environmentally friendly products promotes a circular green economy and cleaner production. The potential use of natural waste materials without additional processing for the removal of priority pharmaceuticals from water was investigated. Here, the performance of selected low-cost biosorbents (biochar, macro-algae and wood chippings) was evaluated using two extensively prescribed model pharmaceuticals: diclofenac (DCF) and trimethoprim (TMP). The physicochemical properties of the biosorbents were examined (to shed light on likely biosorption mechanisms) using Brunauer–Emmett–Teller (BET) measurements, scanning electron microscopy (SEM), zero point of charge (pHzpc) measurements and Fourier transform infrared spectroscopy (FTIR). Experimental data from kinetic studies fitted a pseudo-second order model, and multiple diffusion steps limited the mass transfer of analytes. Intra-partile diffusion was the rate limiting step for biochar, while macro-algae and wood chippings were limited (mainly) by adsorptive attachment. The equilibrium data for most of the studied systems best fitted a Langmuir model, while the Freundlich model provided a better fit for TMP with wood chippings. At μg∙L−1 initial pharmaceutical loading levels, the maximum biosorption capacity for DCF was attained with biochar (7.25 × 103 μg g−1), while macro-algae performed best for TMP (7.14 × 104 μg g−1). Both chemical and physical interactions were likely responsible for the biosorption of pharmaceuticals. High removal efficiencies were achieved at the low initial loadings studied, indicating the potential application of those sustainable low-cost biosorbents at low (environmentally relevant) pharmaceutical concentrations.

Original languageEnglish
Pages (from-to)88-97
Number of pages10
JournalJournal of Cleaner Production
Volume227
Early online date11 Apr 2019
DOIs
Publication statusPublished - 1 Aug 2019

Fingerprint

Drug products
Isotherms
isotherm
drug
Biosorption
macroalga
kinetics
Algae
Kinetics
Macros
Wood
cost
Costs
Water
water
cleaner production
physicochemical property
FTIR spectroscopy
Fourier transform infrared spectroscopy
mass transfer

Keywords

  • Biosorption mechanisms
  • Circular economy
  • Low-cost waste material
  • Pharmaceuticals
  • Sustainable development
  • Water remediation

Cite this

Li, Yuan ; Taggart, Mark A. ; Mckenzie, Craig ; Zhang, Zulin ; Lu, Yonglong ; Pap, Sabolc ; Gibb, Stuart. / Utilizing low-cost natural waste for the removal of pharmaceuticals from water : Mechanisms, isotherms and kinetics at low concentrations. In: Journal of Cleaner Production. 2019 ; Vol. 227. pp. 88-97.
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Utilizing low-cost natural waste for the removal of pharmaceuticals from water : Mechanisms, isotherms and kinetics at low concentrations. / Li, Yuan; Taggart, Mark A.; Mckenzie, Craig; Zhang, Zulin; Lu, Yonglong; Pap, Sabolc; Gibb, Stuart.

In: Journal of Cleaner Production, Vol. 227, 01.08.2019, p. 88-97.

Research output: Contribution to journalArticle

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