Acid-activated biochar increased sulfamethazine retention in soils

Meththika Vithanage, Anushka Upamali Rajapaksha, Ming Zhang, Sören Thiele-Bruhn, Sang Soo Lee, Yong Sik Ok

Research output: Contribution to journalArticlepeer-review

122 Citations (Scopus)


Sulfamethazine (SMZ) is an ionizable and highly mobile antibiotic which is frequently found in soil and water environments. We investigated the sorption of SMZ onto soils amended with biochars (BCs) at varying pH and contact time. Invasive plants were pyrolyzed at 700 °C and were further activated with 30 % sulfuric (SBBC) and oxalic (OBBC) acids. The sorption rate of SMZ onto SBBC and OBBC was pronouncedly pH dependent and was decreased significantly when the values of soil pH increased from 3 to 5. Modeled effective sorption coefficients (KD,eff) values indicated excellent sorption on SBBC-treated loamy sand and sandy loam soils for 229 and 183 L/kg, respectively. On the other hand, the low sorption values were determined for OBBC- and BBC700-treated loamy sand and sandy loam soils. Kinetic modeling demonstrated that the pseudo second order model was the best followed by intra-particle diffusion and the Elovich model, indicating that multiple processes govern SMZ sorption. These findings were also supported by sorption edge experiments based on BC characteristics. Chemisorption onto protonated and ligand containing functional groups of the BC surface, and diffusion in macro-, meso-, and micro-pores of the acid-activated BCs are the proposed mechanisms of SMZ retention in soils. Calculated and experimental qe (amount adsorbed per kg of the adsorbent at equilibrium) values were well fitted to the pseudo second order model, and the predicted maximum equilibrium concentration of SBBC for loamy sand soils was 182 mg/kg. Overall, SBBC represents a suitable soil amendment because of its high sorption rate of SMZ in soils.

Original languageEnglish
Pages (from-to)2175-2186
Number of pages12
JournalEnvironmental Science and Pollution Research
Issue number3
Publication statusPublished - 2015 Feb
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the Korea Ministry of Environment as a Geo-Advanced Innovative Action Project (G112-00056-0004-0). Instrumental analyses were supported by the Korea Basic Science Institute, the Environmental Research Institute and the Central Laboratory of Kangwon National University, Korea. The Ministry of Technology, Research and Atomic Energy in Sri Lanka partially supported the first author.

Publisher Copyright:
© 2014, Springer-Verlag Berlin Heidelberg.


  • Activated carbon
  • Amendment
  • Black carbon
  • Charcoal
  • Emerging contaminant
  • Pharmaceuticals

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis


Dive into the research topics of 'Acid-activated biochar increased sulfamethazine retention in soils'. Together they form a unique fingerprint.

Cite this