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005 20250920173734.0
008 190401n 000 0 eng d
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_aRei Mart P. Alconera.
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_aAdsorption of lead and cadmium from aqueous solution onto activated carbon derived from malunggay (moringa oleifera) fruit shell waste /
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_cRei Mart P. Alconera.
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_cApril 2017.46
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_a84 pp.
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_aThesis: (Bachelor of Science in Chemistry) - Pamantasan ng Lungsod ng Maynila, 2017.
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_aABSTRACT: The activated carbon derived from malunggay (Moringa oleifera) fruit shell waste was produced using 50% phosphoric acid (H3PO4) with a ratio of 1:1 w/w. The resulting carbon (UAC) was modified using concentrated nitric acid (HNO3) for oxidation (OAC). The unmodified (UAC) and modified (OAC) were characterized using SEM, FT-IR spectroscopy, iodine number and methylene blue number determination. Langmuir, Freundlich and Temkim isotherm models were used. At pH 4 and carbon dosage of 20 mg, the fit isotherm for the adsorption of Pb onto UAC was Freundlich and Temkin with an R2 of 0.9760 and 0.9581 respectively. For the adsoption of Cd at pH 6 and a carbon dosage of 40 mg for UAC and 60 mg for OAC, Langmuir, Freunlich, Temkin, and Dubinin-Radushkevich fit with an R2 of 0.9953, 0.9999, 0.9862, 0.9292 for UAC respectively, and 0.9956, 0.9732, 0.9913, 0.9820 for OAC respectively. The maximum adsorption capacity of Pb and Cd onto OAC was calculated with a qmax of 27.22 mg/g and 25.74 mg/g respectively. Pseudo-second order fit the most for the adsorption of Pb and Cd with a linear R2 with a qe (mg/g) of 37.04 for UAC and 24.81 for OAC in Pb; while 56.60 for UAC in 20.44 for OAC in Cd.
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