Application Of Modified Mine Waste For The Sustainable Management Of Fluoride In Drinking Water
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Abstract
Waste rocks obtained from mining operations are typically stockpiled due to the lack of their economic value. This practice resulted in significant land occupation and potential for secondary pollution risks due to the lack of probability of leaching. This study investigates the potential use of waste rocks as a new type of adsorbent for groundwater that is enriched in fluoride. Ferrous chloride was added to shale, a coal mining refuse, at a 3:1 ratio to change its chemical makeup. By using batch adsorption, the adsorption process was optimised. Using energy-dispersive X-ray (EDS), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectrophotometer (FTIR), the adsorbent's surface morphological characterisation was carried out. The best results were obtained when polluted water was defluoridated for 60 minutes at a neutral pH using 100 mg/L. A 32% clearance efficiency was achieved at a 10 ppm fluoride contamination level. Post characterization and optimization the adsorbent was tested for Langmuir and Freundlich isotherm together with kinetics pseudo first and second order to ensure its adsorption capacity
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