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Journal of Applied Sciences and Environmental Management
World Bank assisted National Agricultural Research Project (NARP) - University of Port Harcourt
ISSN: 1119-8362
Vol. 20, No. 4, 2016, pp. 1163-1176
Bioline Code: ja16126
Full paper language: English
Document type: Research Article
Document available free of charge

Journal of Applied Sciences and Environmental Management, Vol. 20, No. 4, 2016, pp. 1163-1176

 en Chemical Oxygen Demand (COD) Attenuation of Methyl Red in Water using Biocarbons obtained from Nipa Palm Leaves
ADOWEI, PEREWARE & ABIA, A.A.

Abstract

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.

Keywords
Chemical oxygen demand; biocarbon; methyl red; biodegradation; bioremediation; Nipa palm

 
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