Isolation of Silica-Lignin Composites from Rice Husk and Their Adsorption to Cr(VI)

Yati B. Yuliyati (Department of Chemistry, University of Padjadjaran Jl. Raya Bandung-Sumedang KM. 21 Jatinangor, Sumedang, West Java Indonesia telp/fax: [phone])
Seli Listiani (Department of Chemistry, University of Padjadjaran Jl. Raya Bandung-Sumedang KM. 21 Jatinangor, Sumedang, West Java Indonesia telp/fax: [phone])
Solihudin Solihudin (Department of Chemistry, University of Padjadjaran Jl. Raya Bandung-Sumedang KM. 21 Jatinangor, Sumedang, West Java Indonesia telp/fax: [phone])
Atiek Rostika Noviyanti (Department of Chemistry, University of Padjadjaran Jl. Raya Bandung-Sumedang KM. 21 Jatinangor, Sumedang, West Java Indonesia telp/fax: [phone])

ALCHEMY Jurnal Penelitian Kimia
Vol 14, No 2 (2018): September

Rice husk is the most abundant agricultural waste in Indonesia. It can be used as a precursor for multifunctional materials such as silica-lignin composite for adsorbents. Silica-lignin can reduce heavy metal content in an industrial waste, such as the content of Cr(VI). This study aims to isolate and characterize silica-lignin composite, and determines the isotherm type of silica-lignin for hexavalent chromium adsorption. The isolation from rice husk used an alkali extraction method. Confirmation of typical functional groups in the silica-lignin composite was characterized by FTIR, while the morphology was characterized by SEM, respectively. The results reveal that the silica-lignin isolation was successfully performed.  FTIR spectra indicate a typical wavenumber of the silica-lignin.  The SEM image of the composite showed homogeneous morphology. The silica-lignin adsorption process on hexavalent chromium followed a Brunauer–Emmett–Teller (BET) isotherm type indicated by multilayer adsorption with a surface area of 948.8421 mg. g-1.