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Batch removal of metanil yellow (MY) from aqueous solution by adsorption on HNO3-treated-H3PO4-activated carbon (NATPAAC) from Gmelina aborea (G. aborea) Bark: kinetic and mechanism studies

100%
Isiuku B. O., Onyema M. O.
World News of Natural Sciences
|
2017
|
tom 13
As metanil Yellow dye is removed from aqueous solution by batch adsorption on NATPAAC derived from G. aborea bark, we studied the effects of initial dye concentration (Co), initial pH and adsorbent dosage at 29 °C. The experimental equilibrium adsorption capacities (qe) obtained, were 2.35, 1.00 and 0.48 mg/g for Co 25, 50 and 100 mg/L, respectively. The kinetics and mechanism of the adsorption were then modeled by fitting experimental data into the pseudo-second order (PSO), Based on correlation coefficient R2 (> 0.95) values, results show that the PSO and Elovich models simulated experimental data well, but the PSO model simulated it the best. The Boyd model confirmed that the adsorption process was controlled by liquid film diffusion and the effective diffusion coefficients were very low. Moreover, the qe values decreased with increase in Co, increase in pH and increase in adsorbent dosage. However, the removal of MY from aqueous solution was very low. In addition, treatment of carbon with dilute HNO3 had no favorable impact.
2
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Packed-bed column adsorption of metanil yellow (MY) from simulated wastewater using granular NaOH-activated carbon from cassava (Manihot esculenta) peels

100%
Isiuku B. O., Horsfall Jr. M.
World News of Natural Sciences
|
2017
|
tom 14
The ability of NaOH-activated carbon derived from cassava peels waste to remove MY from aqueous solution was carried out in a fixed-bed column adsorber. The parameters studied included initial solution concentration, Co, carbon bed height and volume flow rate. The temperature of operation and initial solution pH were 29 °C and 5.32, respectively. The optimum adsorption capacity, qe 4.12 mg/g was obtained at Co 10mg/L, bed height 10cm and flow rate, 13.3ml/min. Experimental data were analyzed with Langmuir, Freundlich and Temkin isotherm, as well as the Thomas, Yoon-Nelson and Clark kinetic models. All the models were good fits for experimental data based on correlation coefficient, R2 values. The ΔGads and Freundlich n (1.587) show that the biosorption was spontaneous, good and physical. Results show that NaOH-activated carbon from cassava peels has low capacity to remove MY from aqueous solutions.
3
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Fixed-bed adsorptive removal of metanil yellow from simulated wastewater in a fixed-bed column by nitric acid-treated-H3PO4-activated carbon (NATPAAC) from oil palm fruit mesocarpfibre

80%
Isiuku B. O., Ojike C. A., Akakuru O. U., Ibe F. C.
World News of Natural Sciences
|
2018
|
tom 17
We carried out fixed-bed column adsorption of metanil yellow from simulated wastewater on NATPAAC derived from oil palm fruit mesocarpfibre so as to determine the adsorption capacity, qe, of the carbon under the effects of inlet concentration, Co, carbon bed height, H and dye solution flow rate, Q. Our results indicate that the optimum qe was 15.982 mg/g by Co 25 mg/L, H 4.1cm and Q 8 mL/min. In the study, qe was observed to decrease with increase in Co and Q. The optimum bed height was 4.1cm. Our experimental data were modelled by applying Thomas and Yoon-Nelson kinetic models. Correlation coefficient, R2 values (generally above 0.85) show that the two kinetic approaches provide an effective model of the experimental data. We conclude that oil palm fruit mesocarpfibre has potential as a precursor for production of carbon for acid-dye removal from wastewater.
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