Process Engineering

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Browsing Process Engineering by Subject "Activated carbon"

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    Preparation and Characterization of Activated Carbon from Flower Waste Biomass for Methylene blue Removal
    (Addis Ababa University, 2019-11) Getu, Maru; Sintayehu, Nibret (PhD)
    Activated carbon (AC) can be used as an adsorbent to remove pollutants from waste water streams. 520 kg flower biomass waste is generated daily at a single floriculture industry in Ethiopia. Despite AC has been produced from different lignocellulosic biomass waste, utilizing Flower waste biomass (FWB) as a precursor to produce AC has an advantage of being new raw material, easily available, renewable precursor, and can be a way of reducing environmental pollution. This study presents synthesis of AC from FWB by chemical activation method using ZnCl2 and removal of methylene blue (MB) using the as-prepared AC. The parameters in the study were impregnation ratio, carbonization temperature, and carbonization time. Higher BET surface area of 750 m 2 -1 g , pore volume of 1.91 cm 3 -1 g and pore diameter of 1.89 nm was obtained at 1:1 impregnation ratio, ° 500 C carbonization temperature, and 1 hr of carbonization time. Effect of adsorption dosage, PH, initial dye concentration, and contact time on percentage removal of MB were studied. Maximum removal of MB was recorded at 0.05 g adsorbent dosage, 60 min contact time, PH of 10, and initial dye concentration of 10 mg L -1 . Kinetics and isotherm studies showed that the adsorption mechanism of MB using FWB based AC follows pseudo second order while both Langmuir and Freundlich model well fitted the adsorption data with maximum removal efficiency of 94.2% and adsorption capacity of 22.39 mg g -1 . FWB can be a good precursor for AC production and can be used to remove MB from wastewater.