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In this study the influence of temperature, hydrochloric acid concentration on the red mud modification was investigated. The findings showed that the adsorbent which was prepared at 8000C, with HCl 2M was the most effective for removing picric acid (TNP) from aqueous solution. The modified adsorbent was characterized by scanning electrical microscope (SEM), X-ray powder diffraction (XRD), Brunauer–Emmett–Teller (BET). The results showed that the adsorption process of TNP best occurred at pH 3. The adsorption data of TNP onto the modified red mud was well matched with Langmuir and Freundlich isotherm models.
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