Kinetic Studies of Emerging Contaminants Removal from Wastewater using Organo Modified Activated Carbon

Authors : Abdullahi Abdulsalam; Dr. Nura Alhaji Yaro; Alhassan Mohammed; Yahya Saleh Ibrahim; Dr. Kabiru Mustapha Yakasai; Dallacoasta Iyayosa Andrea; Bello Alhassan

Volume/Issue : Volume 8 - 2023, Issue 10 - October

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In these studies, an efficient organo-modified activated carbon adsorbent from sugarcane bagasse with high adsorption capacity was prepared and used for the removal of emerging contaminants from wastewater gotten from the Kaduna Polytechnic female hostel. The produced adsorbent was characterized to determine the functional groups, surface area, crystal structures, FTIR, BET, and XRD analyses. The BET surface areas of the direct modified activated carbon and the acid-pretreated activated carbon for adsorption were found to be 572 m2 /g and 356 m2 /g, respectively. The effect of adsorption parameters, which include contact time, adsorbent dosage, and temperature, on uptake behavior was all examined. Langmuir and Freundlich isotherm models were fitted to the adsorption data. The adsorption of triclosan, diclofenac, bisphenol A, and methyl paraben followed pseudo-second-order kinetics and fit well to the Freundlich isotherms indicating chemisorption. The wastewater compositions were found to contain major ECs identified as diclofenac, triclosan, methylparaben, and bisphenol A, which account for 76.206% of the ECs that are detrimental to human health and the environment. The effect of adsorbent dosage shows that all ECs removed rise rapidly from 0.5–1.0 g adsorbent dosage and then slowly to reach a maximum of 100% Triclosan, 99.86% Diclofenac, 92.91% BPA, and 69.26% Methyl-Paraben removal as adsorbent dosage increases to 2g. On the other hand, as the adsorbent dosage increases to 3g, the removal rate of all ECs is observed to drop slightly and then attain maximum removal as the dosage rises to 4g. Also, the adsorbent characterization shows that the morphology of the acid-pretreated organo- modified AC adsorbents has better pore development with a higher amorphous structure that enhances uptake of contaminants into the adsorbents. Directly modified AC adsorbents show the highest methyl-paraben removal with an increase in adsorbent dosage when compared to other adsorbents.

Keywords : Emerging Contaminants, Organo Modified Adsorbents, Activated Carbon, Adsorption Efficiency, Wastewater.


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