Modification of tea biochar with Mg, Fe, Mn and Al salts for efficient sorption of PO43- and Cd2+ from aqueous solutions

Akgul G., Maden T. B., Diaz E., Moreno Jimenez E.

JOURNAL OF WATER REUSE AND DESALINATION, vol.9, no.1, pp.57-66, 2019 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 9 Issue: 1
  • Publication Date: 2019
  • Doi Number: 10.2166/wrd.2018.018
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.57-66
  • Recep Tayyip Erdoğan University Affiliated: Yes


There is a requirement to provide more efficient, sensitive, low-cost materials for remediation of contaminated water. Biochar as a sorbent is an effective and low-cost material to remove contaminants in water but its adsorption properties can be improved by impregnation of metals on the surface. In this study, a biochar derived from industrial tea waste was modified with Mg, Fe, Mn and Al salts to create different composites, which were tested for PO43- and Cd2+ sorption. The modifications created biochars with the (hydr)oxides of each metal and changed the characterization parameters and surface functionality. Cd2+ was efficiently removed by all the materials even at high Cd(2+ )loadings in the water (100 mg Cd2+ L-1), the biochar with Mg being the most efficient in Cd2+ removal. The biochar with Mg also achieved the best sorption of PO43-, sorbing up to 30% at 20 mg PO43- L-1. Tea waste biochar can be modified with metal salts to enhance inorganic pollutant removal from waters, especially with Mg salts.