Sorption Efficiency in Dye Removal and Thermal Stability of Sorghum Stem Aerogel

Eka Lutfi Septiani^1,a*, Okky Putri Prastuti¹, Yuni Kurniati¹, Mar'atul Fauziah², Widiyastuti^2,b*, Heru Setyawan², Wahyudiono³, Hideki Kanda³ and Motonobu Goto³

¹Department of Chemical Engineering, Universitas Internasional Semen Indonesia, Kompleks PT. Semen Indonesia (Persero) Tbk, Jl. Veteran, Gresik 61122, Indonesia

²Department of Chemical Engineering, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya 60111, Indonesia

³Department of Material Process Engineering, Nagoya University, Furo-Cho, Chikusa-Ku, Nagoya 464-8603, Japan

^aeka.septiani@uisi.ac.id, ^bwidi@chem-eng.its.ac,id 

Abstract

Agroindustry waste containing cellulose compound, Sorghum stem, was utilized to become cellulose aerogel which was then used as dye absorbent in textile dye wastewater. Cellulose was prepared by sorghum stem powder delignification using 6%w of NaOH solution. The ratio of powder and NaOH was varied in 1:12, 1:15, and 1:20. After this process, the powder was synthesized with NaOH/Urea to produce an aerogel by the freeze-drying method. The result shows that a higher amount of NaOH in the delignification process could increase aerogel density and decrease the porosity. Thermal stability and sorption efficiency of the aerogel was analyzed in this study. Higher porosity of aerogel tends to raise % removal in methylene blue absorption. This study reveals that aerogel three times more effective than activated carbon in dye removal.

Keywords: Absorption, Aerogel, Batik dye wastewater, Sorghum stem

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