Silica-Rice Husk as Adsorbent of Cr (VI) Ions Prepared through Sol-Gel Method

Siti Rodiah*  -  Universitas Islam Negeri Raden Fatah Palembang, Indonesia
Mifta Huljana  -  Universitas Islam Negeri Raden Fatah Palembang, Indonesia
Jauharuddin Luthfi Al Jabbar  -  Universitas Islam Negeri Raden Fatah Palembang, Indonesia
Chairul Ichsan  -  Universitas Islam Negeri Raden Fatah Palembang, Indonesia
Hasan Marzuki  -  Universitas Islam Negeri Raden Fatah Palembang, Indonesia

(*) Corresponding Author
DOI: 10.21580/wjc.v4i1.8045

One of the heavy metals contained in the textile industry wastewater is chromium (Cr). Chromium hexavalent ions (Cr6+) are highly toxic and its accumulation in the human body will cause various negative impacts. This study aimed to determine the characteristics of silica synthesized by the sol-gel method to gain homogeneity and high purity. Synthesized silica was calcined at 700°C for 4 hours and its performance to adsorb Cr(VI) ions  in textile wastewater was investigated. The presence of -OH group from silanol (–Si-OH) was appeared at wavenumber 3367.70 cm-1, meanwhile siloxane functional groups were recorded at 1056.99 cm-1 and 784.38 cm-1 due to the O-Si-O asymmetric stretching and Si-O bending vibration. Optimum conditions of silica to adsorb Cr(VI) ions took place at pH 2 and contact time of 90 minutes by adsorption efficiency of 75,65% and followed the Freundlich isotherm.

Keywords: Chromium hexavalent ions; rice husk; sol-gel method; silica; textile home industrial wastewater

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