Open AccessSilica-Rice Husk as Adsorbent of Cr (VI) Ions Prepared through Sol-Gel Method
Author(s) -
Siti Rodiah,
Mifta Huljana,
Jauharuddin Luthfi Al Jabbar,
Chairul Ichsan,
Hasan Marzuki
Publication year - 2021
Publication title -
walisongo journal of chemistry
Language(s) - English
Resource type - Journals
eISSN - 2621-5985
pISSN - 2549-385X
DOI - 10.21580/wjc.v4i1.8045
Subject(s) - adsorption , husk , hexavalent chromium , calcination , silanol , wastewater , freundlich equation , chromium , siloxane , metal ions in aqueous solution , nuclear chemistry , ion , silica gel , materials science , chemistry , polymer , metallurgy , chromatography , catalysis , composite material , environmental engineering , organic chemistry , botany , engineering , biology
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.