Cr(III) removal from tannery effluents using silica obtained from rice husk and modified silica

Moises Gutiérrez-Valtierra, Carmen Salazar-Hernández, Juan Manuel Mendoza-Miranda, Enrique Elorza-Rodríguez, María Jesús Puy-Alquiza, Martín Caudillo-González, Ma Mercedes Salazar-Hernández

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3 Scopus citations


Silica extracted from rice husk, which is represented as SRH, is inexpensive mesoporous silica useful for heavy metal removal from industrial waste effluents. SRH was synthesized through calcination at 650°C in an oxidant atmosphere obtaining a mesoporous silica with BET area of 297 m2 g-1 and 2.3 nm of pore diameter average, respectively. The surface of this silica was modified through a post-synthesis route with amine and polyamine groups obtained at 16% and 47% of modified surface with amine or polyamine groups (SRH-NH2 and SRH-triamine). The chromium(III) removal capacity of SRH and amine-modified silica was tested with stock solutions, observing a fast sorption process and reaching its equilibrium adsorption time in 20 min. The resulting Cr(III) removal capacity was 6.7, 22.1 and 34.3 mg g-1 for SRH, SRH-NH2 and SRH-triamine silicas, respectively. SRH and SRH amine silicas were used to remove Cr(III) from a sample taken from a tannery waste effluent from the city of Leon, Guanajuato, Mexico, and displayed a 70% and 90% removal, respectively. Our results confirm the ability of these inexpensive silicas to adsorb materials and their potential use in heavy metals removal processes from industrial waste effluents.

Original languageEnglish
Pages (from-to)152-163
Number of pages12
JournalDesalination and Water Treatment
StatePublished - 1 Aug 2019
Externally publishedYes


  • Amine modified SRH
  • Cr(III) removal
  • Industrial waste effluents
  •  Silica rice husk


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