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Open AccessArticle

Uptake of As(V) from Groundwater Using Fe-Mn Oxides Modified Kaolin Clay: Physicochemical Characterization and Adsorption Data Modeling

1
Environmental Remediation and Nanoscience Research Group, Department of Ecology and Resource Management, University of Venda, Thohoyandou 0950, South Africa
2
Department of Applied Chemistry, University of Johannesburg, Doornfontein, Johanessburg 2028, South Africa
*
Author to whom correspondence should be addressed.
Water 2019, 11(6), 1245; https://doi.org/10.3390/w11061245
Received: 18 March 2019 / Revised: 15 April 2019 / Accepted: 23 April 2019 / Published: 14 June 2019
(This article belongs to the Special Issue Technologies Developing in Heavy Metals' Removal from Water)
The present study evaluated the effectiveness of Fe-Mn modified kaolin clay in the uptake of As(V) from the solution. The elemental composition was characterized using X-ray fluorescence (XRF), while the surface morphology was characterized using Scanning Electron Microscopy (SEM). The surface area, pore diameter, and pore volume were determined using Brunauer, Emmett, and Teller (BET) and Barrett-Joyner-Halenda (BJH) techniques. The efficiency of the Arsenic removal of the adsorbent was evaluated using batch experiments. The results showed that the percentage of As(V) removal is optimum at acidic pH and decreased as the solution pH becomes more alkaline. The adsorption kinetics data fitted better to pseudo-second-order compared to the pseudo-first-order of reaction kinetics. The adsorption isotherm data fitted to the Langmuir isotherm model showing a maximum adsorption capacity of 2.44 mg/g, adsorbate concentration range of 1–30 mg/L, and adsorbent dosage of 0.4 g/100 mL. The value of ∆G° of the thermodynamic parameter was found to be negative, while ∆H° and ∆S° were found to be positive. For the regeneration-reuse study, the percentage of removal was found to be >85% after the sixth cycle of reuse. The results obtained from this study showed that Fe-Mn modified kaolin (FMK) is suitable for use in the uptake of As(V) from groundwater. View Full-Text
Keywords: arsenic; adsorption; kinetics; isotherms; thermodynamics and regeneration arsenic; adsorption; kinetics; isotherms; thermodynamics and regeneration
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Mudzielwana, R.; Gitari, M.W.; Ndungu, P. Uptake of As(V) from Groundwater Using Fe-Mn Oxides Modified Kaolin Clay: Physicochemical Characterization and Adsorption Data Modeling. Water 2019, 11, 1245.

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