REMOVAL OF FLOURIDE FROM GROUND WATER BY SURFACE MODIFICATION OF RED SOIL ON THE POLYANILINE: ACASE OF MAREKO SPEACIAL WOREDA, ETHIOPIA

Abstract

Surface modification of natural adsorbents for enhanced adsorption of water pollutants is strategy developed by varieties of research groups. The purpose of this study was to analyses physicochemical properties and to develop adsorbent material by modifying the electronic structure of red soil via facile in situ chemical oxidative polymerization techniques to remove fluoride from groundwater. The as-synthesized materials were also characterized using powder xiiXRD, FT-IR, UV- Vis spectroscopy, and Conduct meter, and their adsorption performance was tested. The XRD studies reveal that the crystal structures of embedded red soil were amorphous, while PANI, PANI/red soil nano particles distorted and become polycrystalline. The maximum adsorption capacity (qmax) of fluoride ions by PANI/RS was 9.35mg/g. The maximum adsorption performance of PANI/RS at different optimization parameter fluoride ions at pH 4.0, contact time for the adsorption process was 50 minutes, temperature was 350c, initial concentration15mg/L with 2mg adsorbent is 99.9%. Both Langmuir and Freundlich isotherm data for fluoride have a good fit with the experimental data (R2 = 0.94 and 0.95), respectively. Therefore, PANI/RS is remarkably outperformed red soil can be a promising candidate to be used as and sorbent material to remove fluoride ions from groundwater