Chemical Modification of Sago Hampas for Methylene Blue Dye Adsorption

Nor Aqilah, Mohd Azmi (2019) Chemical Modification of Sago Hampas for Methylene Blue Dye Adsorption. [Final Year Project Report] (Unpublished)

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Abstract

Sago hampas (SH) is an inexpensive and abundantly available material with the characteristics of a good adsorbent for treating dye from textile wastewater. SH was transformed into SH carbon (SHC) via two-stage slow pyrolysis. In the first stage, 2 g of SH was subjected at 200 ℃, and second stage at 400 ℃ resulting 28.5 wt% SHC yield. The produced SHC undergone chemical modification using 5 M KOH activating agent by impregnation method to afford SHC - AC. The physicochemical properties of the SH, SHC and SHC - AC were characterized using proximate analysis, FTIR, SEM and BET surface area analyses. In this study, Response Surface Methodology was also applied using two parameter which are initial concentration of MB solution and contact time. SHC and SHC – AC effectiveness in removing methylene blue was studied based on initial concentration of MB (2-10 mg/L) and contact time (10-60 min). Results showed, SHC – AC gave a better adsorption of methylene blue (95.94%) compared to SHC (71.79%) at 50 minutes contact time. The adsorption of methylene blue of SHC – AC was following Langmuir isotherm (monolayer adsorption) with highest regression coefficient of 0.9964 and kinetics of adsorption by pseudo-second-order model (R2 = 1). RSM optimization study showed that the adsorption of methylene blue could reach up to 92.46% at 11.66 mg/L initial concentration and 17.5 min contact time. The acid-base treated SH demonstrates promising methylene blue removal efficiency and can be potentially studied for use at larger scale.

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