Iron improving bio-char derived from microalgae on removal of tetracycline from aqueous system

Liang Peng*, Yanqing Ren, Jidong Gu, Pufeng Qin, Qingru Zeng, Jihai Shao, Ming Lei, Liyuan Chai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

99 Scopus citations


Novel magnetic carbonaceous bio-char was hydrothermal prepared from microalgae under different loadings of iron and its structures and surface chemistry were characterized with Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and nitrogen adsorption-desorption isotherm (BET). The morphology of bio-char changed from sheet to particle as iron loading increased and its surface area also increased. When 3.0 g of dried microalgae and 6.0 mmol iron salt ((NH4)2SO4·FeSO4·6H2O) were mixed and treated, the obtained bio-char possessing the highest amount of oxygen-containing functional groups resulted in the best adsorption performance on tetracycline (TC). This adsorption process was fitted to Langmuir adsorption isotherm and the maximum adsorption capacity was 95.86 mg/g, which is higher than other bio-char reported. The iron loading contributed to the higher adsorption capacity of bio-char, which may be due to three factors, the high surface area, more hydrogen bonding, and bridging effects of the structural Fe for TC. Our data suggest that bio-char may have more important role in stabilization of pollutants in the environment.

Original languageEnglish
Pages (from-to)7631-7640
Number of pages10
JournalEnvironmental Science and Pollution Research
Issue number12
StatePublished - Jun 2014
Externally publishedYes


  • Adsorption capacity
  • Bio-char
  • Iron
  • Tetracycline


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