Chemical Oxygen Demand (COD) Attenuation of Methyl Red in Water using Biocarbons obtained from Nipa Palm Leaves|
ADOWEI, PEREWARE & ABIA, A.A.
Attenuation of methyl red dyestuff in water was assessed by COD reduction after contacting the solution
with biocarbons produced by one-pot pyrolysis of sopping Nipa palm leaf biomass in H2O (physically-modified biocarbon:
PMB), H3PO4 (acid-modified biocarbon: AMB) and KOH (base-modified biocarbon: BMB). Physicochemical
characterization of the biocarbons were investigated and the result for BMB were carbon yield (46.6 ± 0.21 %), porosity
(79%), iodine number (814 mg/g), surface area (681 m2/g) and pH (6.41 ± 0.11 to 7.81 ± 0.12). Optimal COD reduction for
methyl red in water by PMB, AMB, BMB compared with CAC were 82.7%, 76.7 %, 83.5 %, and 93.3 % respectively.
Langmuir isotherm model was used to predict the maximum COD reduction capacity of the biocarbons and CAC (PMB:
2.15 mg/g, AMB: 8.73 mg/g, BMB: 11.83 mg/g and CAC: 62.60 mg/g). Thermodynamic assessment of the data based on
Gibb’s free energy (ΔG°) revealed that ΔGo values were negative (- 1.31 to - 5.89 kJ/mol) and relatively low (<< -20
kJ/mol), which indicated spontaneous nature requiring minimal energy. One-way analysis of variance (ANOVA) performed
to validate the COD degradation capacity for methyl red in water amongst the biocarbons revealed no significant difference
(p > 0.05). Conclusively, Nipa palm could be a favorable source to derive eco-friendly and locally accessible biocarbon for
mitigation of organic contaminants in water.
Chemical oxygen demand; biocarbon; methyl red; biodegradation; bioremediation; Nipa palm