Effective treatment of nutrients by adsorption onto the surface of a modified clay and a toxicity evaluation of the adsorbent

Soonjae Lee, Kyu Sang Kwon, Jae Chun Ryu, Mi Kyung Song, Stephan Pflugmacher, Chanhyuk Park, Sang Hyup Lee, Chul Hwi Park, Jae Woo Choi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

A pure clay ball and surface-modified clay ball were investigated to remove phosphate from synthetic wastewater; phosphate causes eutrophication in hydro-ecological systems. Adsorption tests of phosphate from aqueous solutions onto two types of adsorbents were conducted. The maximum phosphate adsorption capacities of the pure and surface-modified clay ball were found to be 0.084 and 8.869 mg/g, respectively. In a fixed-bed column packed with surface-modified clay balls, the first breakthrough of phosphate appeared after approximately 4000 min. In addition, the phosphate adsorbed on the surface-modified clay ball was effectively desorbed using a 1 M zirconium sulfate solution, and the adsorbent was regenerated for four adsorption and three desorption cycles by maintaining the adsorption capacity at the value before regeneration. X-ray diffraction (XRD), scanning electron microscopy (SEM)/energy-dispersive X-ray spectroscopy (EDX), and Brunauer-Emmett-Teller (BET) analysis method were performed to reveal the characteristics of the surface-modified clay ball. Cytotoxicity experiment was conducted on the developed adsorbents, and as a result, these showed low cytotoxic effect on the human cells. These results indicated that the surface-modified clay ball, due to the low cost, high adsorption capacity, and non-toxicity, has the potential to be utilized in the cost-effective removal of phosphate from aqueous solutions.

Original languageEnglish
Article number111
JournalWater, Air, and Soil Pollution
Volume226
Issue number4
DOIs
Publication statusPublished - 2015 Apr 1

Keywords

  • Adsorption
  • Clay
  • Phosphate
  • Surface modification
  • Toxicity

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Ecological Modelling
  • Water Science and Technology
  • Pollution

Fingerprint Dive into the research topics of 'Effective treatment of nutrients by adsorption onto the surface of a modified clay and a toxicity evaluation of the adsorbent'. Together they form a unique fingerprint.

Cite this